The text of the original in Russian
IPC F 16 H 1 / 08
The traction device This invention relates to engine and can be used on internal combustion engines (ICE) for the tension of belt (chain) drive the main and auxiliary units (generators, air conditioning, etc.). Known mechanical natyazhitel chain (repair «Moskvich» models 2140, 2138. Moscow, Transport, 1983, page 11, 14 and 16) containing a piston, the spring, which affects the heel and the locking bolt, which fixed position natyazhitelya after sampling gap (podnatyazhki).
A disadvantage of this device is the lack of automatic tracking of the provisions of the chain.
It is a hydraulic tensioning device (patent number 2110715), containing a cylindrical casing with a blank groove and piston set in pazu with the possibility of displacement. Piston for the tension of the chain interacts with the fifth in contact with the endless transfer. In the bottom of the groove completed hole associated with a source of liquid under pressure. Bypass valve is made in the form of closing the hole is bent elastic plate. The disc is divided by a line cut in the central part, forming an elastic plate, and the peripheral portion connected to the central - part of the coupling. Peripheral part is kept at the bottom of the groove by means of screw pressure spring, as set out in pazu between the piston and the drive. The spring has at one end turns of constant diameter and with the second end turns of increasing diameter in the direction away from the first end. The traction device includes shoulder restrictions piston back progress made in the sidewall of the groove, as well as the radial clearance between the piston and the side wall of the groove, forming a passage sized liquid under pressure. This device is complex manufacturing itrebuet bring oil pressure, and thus more maslopodvodyaschey system that udorozhaet design. It is a hydraulic tensioning device (patent number 2197654), containing the body, located in a cylindrical cavity in the axial direction of the spring-piston and the adjusting rod, closed with a front shell накидной nut, fitted with an additional set out in the end of the shell natyazhitelya under накидной nut gidrokompensatorom gap, performed in a liquid body, in a cylindrical cavity which is spring in the direction of adjuster rod piston with cross-cutting longitudinal channels and annular groove on the outer cylindrical surface with a set of sealing rings, the natyazhitelya between the shell and the shell gidrokompensatora an elastic membrane. The disadvantage of this device is the limitation on the angle, on the basis of efficiency gidrokompensatora, and the need to bring oil pressure. It is a hydraulic tensioning device (patent number 2154760), containing a hollow cylindrical shell, cover with a reverse valve spring force, piston, made of glass and of the shell with a pair of precision.
At the plunger has a number of annular grooves nonsymmetric profile, and on the case of radial holes are located in the lock, having a spherical surface in contact with the grooves on the plunger. Striker pressed to the grooves on the plunger by an elastic ring. More extreme slot from the open end of the plunger has a rectangular cross-section profile. The disadvantages of existing devices is the need for high precision manufacturing of precision and a pair of discrete changes in the situation, as well as underwater oil pressure.
Known strainer (№ 2000128233 publ. 2002.10.10), consisting of a body of spring rod with a braking mechanism for the implementation and eyelets fastening with rubber steel joints, is different in that the braking mechanism of reverse progress made in the form of wedge ball lock, an additional wedging sleeve and in one of the eyelets completed an in-depth face under SPECIAL login for wedging, a power spring located outside of the rod and the shell of an elastic washer sformovany radial openings in the number of balls, as in the case of additionally performed protochka fixation device in a compressed condition - analog.
The disadvantages of existing devices is the high contact stresses in interaction balls and rod, causing premature wear.
The aim is to create a belt tension device (chain) drive auxiliary units is not critical to the angle of working status, without a supply of pressure oil to a large bearing surface to increase the working lifetime. The goal is achieved by the fact that the traction device, comprised of the shell, the hard bushings, spring rod, and bearing five, according to the invention, the stock vypolnenyvintovye surface in one or more visits in the shell is executed longitudinal slot for stoporeniya springs before activation, and This slot can be positioned at an angle to the axis and axis of the conical bearing five completed or it is executed Kosaya lyska; as a storage of potential energy is used combined compression-torsion spring, the turns of the spring may be navity sinusoid, to reduce friction and wear of used tube sliding .
This device is presented in Fig.1-6, where:
in Fig.1 shows a longitudinal section of the device in a position to supply (to install on the engine) with a balloon-positions of all the details.
This device is presented in Fig.1-6, where:
in Fig.1 shows a longitudinal section of the device in a position to supply (to install on the engine) with a balloon-positions of all the details.
On Fig.2 shows a section A-A for an explanation injection workshop combined spring lever 4 in the supporting slots five 5
On Fig.3 shows a longitudinal section of the device B-B in the perpendicular plane of Fig.1, but in an intermediate position (the motor and mechanism of tension with a chain suspended not shown). Demonstrated interaction of the backbone of their 5 five shoulders with machined surface rod 3 and the nomination of the rod 3.
On Fig.4 shows the axonometric view of supporting five 5 with oblique lyskoy.
In Fig.5 shows the axonometric view implementation of a longitudinal slot in the casing 1 at an angle to its axis and type stoporeniya operating leverage combined spring 4 in the slot.
On Fig.6 shows the local view of the section device, similar to Fig.1, but with a support 5 fifth, which tapered axle
.
The initial state (state of delivery) device is represented in Fig.1:
The traction device consists of a thin-walled tubular body 1 connected with the standard welded flange 2, which the tensioning device is attached to the engine, thin-walled tubular rod 3 with screw surfaces, combined (tension-compression) springs 4, a working tool which is seamed with a slot supporting five, 5 prosechnoe hole in the rod 3, and longitudinal grooved shell 1 (before activation) - axonometric projection of this compound is shown in Fig.5.
Support arm composite spring 4 is a cross-hole hard sleeve 6 with the outer edge of which is used to zavaltsovki shell 1. In this way the thrust sleeve 6 is held by provorota and axial displacement. In the ring pazu hard bushings 6 posted sealing ring 7 to prevent proistekaniya oil from the inner cavity of the engine (not shown), and getting dirt inside the engine. For greater reliability of the hard socket 7 can be seamed in the shell 1.
Between the rod 3 and a spring 4 can be a sliding tube 8 to reduce friction and wear during operation.
The order of assembly of tensioner: Welded casing 1 with a flange 2, and for fixing the situation before welding on the flange 2 can be otformovany points (Fig.3) with the possibility of the entrance to the helical surface of the shell 1. On the hard sleeve 6 worn sealing ring 7 and the support arm vdevayut springs 4. This sub-set into the body 1 and zavaltsovyvayut. In the spring 4 nasazhivayut sliding tube 8 (if the application is due to the need), then screw the rod 3. Operating lever spring vdevayut 4 slot in the bearing five 5 and extraction down the axis of the conical or oblique lyskoy (axonometric view of supporting five 5 with oblique lyskoy is shown in Fig.4, but with a conical axis in Fig.6), injected into the rod hole prosechnoe 3. Spring 4, together with all parts compress to contact with the shell 1, where the response surfaces vkruchivayut helical rod 3 in block 1. When completely twisted rod 3 the second backbone fifth squeeze down 5 working lever springs 4 and plants it in the slot body 1, after which the supporting heel 5 release (Fig.2). In such a situation strainer transported and installed on the engine.
In view of the loaded rod 3, the area of contact, supporting the work surface with the shell 1 can be increased with the increasing number of calls helical surfaces to increase the resource. Limitation may only be the technological capabilities of the equipment. It means using high-performance stamping elastic medium, and magnetic-pulse stamping, virtually precluding the subsequent machining and minimize waste. This achieved a high economic effect.
The presence of helical surfaces on the rod 3 allows it to elastically push damp and shocks that come with actuators tension that positively affects the increase in resources of all the details.
Perform threaded surfaces on the shell 1 there is no great need - they may be replaced by cyclic projections, which will slide the rod 3. However, the contact area in this case would be considerably less.
The longitudinal slot on wearing body 1 can be made at an angle to the axis (Fig.5), to prevent slippage, the working arm of spring 4 in a compressed state. The angle is chosen close to the angle of turns of the screw. Instead, the slots can be done and the usual opening, but in mass production, the operation will be less productive.
The need for a combination of spring 4 is attributable to the scheme of the tensioner: for wringing the rod will require not only the tangential component of the moment of twist, and axial force to overcome the forces of elasticity chain (belt), the engine of their relationship is about 4 / 1. Due to the large number of revolutions axial force remains almost constant in the range of travel rod 3, which makes it possible to abandon the cart of oil pressure and meet the needs of the tension of the chain (belt) during the lifetime of the engine. However, the moment of torsion and twist angle of more demanding to the number of turns, which can increase the use of sinusoidal spooling springs 4. This allows you to add some 20% of turns, which is the only way in the dense layout podkapotnogo spaces and cramped size tensioner. At the same time decreasing the area of contacting surfaces of the spring 4 and rod 3 (without the use of a tube slide 8), and hence the friction and wear.
Where the application of sinusoidal springs 4 may not be efficient to use the sliding tube 8. It can be manufactured from materials with low coefficient of friction, for example, polytetrafluorethylene (fluoroplastic). As a result, the displacement coils springs 4 and unwinding will take place already on a smooth cylindrical surface of sliding tube 8.
Reference 5 has a heel mushroom shape (Fig.5), the spherical surface where it impinges on the executive machinery tension chain (belt) engine. Longitudinal slot provides axial movement of the bearing 5 on the five working lever 4 when the spring assembly and stragivanii. Tapered axis (Fig.6) or Kosaya lyska provide deformation working lever 4 when the spring assembly and stragivanii (Fig.2).
Work tensioner in the conditional average position is shown in Fig.3.
After installing the tensioner on the engine it is necessary to withdraw from the engagement working lever springs from 4 slots to wear the shell 1. To this end, the executive mechanism tension utaplivayut engine bearing heel inside the tensioner 5. Cone axis and a conical surface oblique reference lyski five 5 start pressing radial station operating lever spring 4 (Fig.2). Once a working lever spring 4 will be released from engagement with a wall slot to wear the shell 1, he begins to interact with the surface holes prosechnogo in stock 3. Overcoming friction in the screw and a pair of contact points between the turns of the spring 4 with a sliding tube 8 (or rod 3 in the general case), as well as the forces of elasticity actuators engine rod 3 starts of the screw body 1 under the action of the accumulated potential energy of the combined spring 4. Reference 5 heel rests on their shoulders machined surface rod 3.
Raising the rod 3 ends in a position of equilibrium when all forces are balanced, falling on the rod 3. This provides the initial tension of the executive mechanisms of the engine.
In the process of working the engines wear mechanisms, which leads to an increase in the length of the chain (belt). The point of equilibrium state is shifted out of the tensioner. Owing to the combination of spring 4 is constantly tracking the new provision by wringing the rod 3.
The presence of vibration when the engine and the oil mist will facilitate the movement of the rod 3 to the shell 1, and turns the spring 4 on the tube slide (rod 3).
Small short-term displacement actuators tension associated with the fits and starts and the unbalance of the engine being offset by the gap between the screw surfaces of the rod 3 and the shell 1 (and the elastic deformation) without rotation of the rod 3. Tensions are distributed over a large area of exposed workers bearing surfaces formed mnogozahodnymi spiral curves, which, coupled with the presence of oil mist greatly reduce wear and tear.
When repairing the engine, requiring the release of tension the chain tensioning device or remove and recharge during the initial assembly, or, if you have access vkruchivayut rod 3 in block 1 without removing the device, which distinguishes it from peers.
Thus, the proposed tensioning device has a low manufacturing cost in mass production, stable parameters of tension throughout the entire period of service, a great resource, low weight and improved performance.
Summary
Tensioning device for chain (belt) drive auxiliary machinery DVS
Application: for the engine and can be used on engines with belt-driven auxiliary machinery or chain.
Essence: in a traction device, comprised of the shell, the hard bushings, spring rod, and bearing five, according to the invention, the threaded rod are made of one or more visits in the shell is executed longitudinal slot for stoporeniya springs before activation, and this slot can be located at an angle to the axis and axis of the conical bearing five completed or it is executed Kosaya lyska; as a storage of potential energy is used combined compression-torsion spring, the turns of the spring may be navity sinusoid, to reduce friction and wear of used tube sliding.
Proposed tensioning device has a low manufacturing cost in mass production, stable parameters of tension throughout the entire period of service, a great resource, low weight and improved performance.
Thus, a chain tensioning device (belt) drive auxiliary units is not critical to the angle of working status, without a supply of oil pressure, high uniformity of parts for various types of engines, with the possibility of quick replacement of the chain (belt) drive without the operation of withdrawing from natyazhitelya engine.
CLAIMS
Device for tensioning the chain (belt) drive mechanism consisting of a corps of hard bushings, spring rod, and bearing five distinct so that the threaded rod are made of one or more visits.
Device for tensioning the chain (belt) drive mechanism consisting of a corps of hard bushings, spring rod, and bearing five distinct themes, as the storage of potential energy using a combined compression-torsion spring.
Device for tensioning the chain (belt) drive mechanism consisting of a corps of hard bushings, spring rod, and bearing five distinct themes, turns of the spring navity sinusoid.
Device for tensioning the chain (belt) drive mechanism consisting of a corps of hard bushings, spring rod, and bearing five distinct so that the axis of the conical bearing five performed.
Device for tensioning the chain (belt) drive mechanism consisting of a corps of hard bushings, spring rod, and bearing five distinct so that further use of the tube slide.
Device for tensioning the chain (belt) drive mechanisms to point 1 or item 2 or paragraph 3 or paragraph 4 or paragraph 5, only difference is in the tank performed longitudinal slot for stoporeniya spring.
Device for tensioning the chain (belt) drive mechanisms to point 6, is due to the longitudinal slot for stoporeniya springs made in the body at an angle to its axis.
Device for tensioning the chain (belt) drive mechanisms to point 1 or Clause 2 or Clause 3 or Clause 4 or Clause 5 or Clause 7, is due to different topics related to the reference pyate done Kosaya lyska .
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Technique 
