Conical elastic sleeve type tensioner for automobile engine timing system and adjustment method

Abstract

The present invention discloses a conical elastic sleeve type tensioner for automobile engine timing system and an adjustment method, comprising a housing (1), wherein an oil inlet hole (10) is provided at the rear end of the housing (1), and a one-way valve cover (2), a one-way valve assembly (3), a return spring (4), a throttle valve (5) and a plunger (6) are sequentially provided on the side of the oil inlet hole (10), wherein the rear end of the plunger (6) is provided with an annular conical groove (8), and a matching elastic sleeve (7) is sleeved on the annular conical groove (8); an annular groove (9) matching the elastic sleeve (7) is provided on the inner wall of the housing (1), and an annular limiting groove (11) is also provided at the front end of the housing (1). The method for adjusting the rebound distance is to adjust the rebound distance by adjusting the groove width of the annular conical groove and the width of the elastic sleeve. The present invention has the characteristic of being able to flexibly and arbitrarily adjust the rebound distance.

Description

Technical Field

[0001] The invention relates to a tensioner for a timing system of an automobile engine, in particular to a tapered elastic sleeve type tensioner for a timing system of an automobile engine and an adjustment method thereof. Background Art

[0002] The purpose of the timing chain tensioner is mainly to avoid poor meshing when the chain sags too much, to limit the vibration amplitude of the chain, and also to increase the meshing angle between the chain and the sprocket. The design technical points of the tensioner are: when the engine is not started, keep the chain in a taut state; when the engine is working, the pressure of the lubrication system is used to further increase the supporting force of the tensioner so that the chain remains in a taut state. In addition, when the chain is stretched and extended after a period of use, the tensioner plunger must still have sufficient stroke. Tensioners can be divided into two categories according to whether there is a check mechanism and a check structure. The non-check tensioner is used for engines that have no requirements for the rebound distance of the plunger. The check tensioner can prevent the plunger from rebounding without restriction, causing the chain and sprocket to mesh and jump teeth, and can reduce the transmission noise of the timing system. However, engines with different performance and structure have different requirements for the rebound distance of the tensioner plunger, so it is necessary to design a variety of tensioners with different structures. Common non-return tensioners include ratchet type, spiral type, and clamp type. Hydraulic tensioners have simple structure, low cost, no non-return function, and large rebound distance of the plunger. They are suitable for engines with low requirements for performance and ride comfort; clamp type tensioners have simple structure and low cost. The rebound distance of the plunger can be adjusted according to the system structure during design. They are suitable for engines with high requirements for performance and ride comfort and with VVT; ratchet tensioners have complex structure and high cost. The rebound distance of the plunger is generally about 3mm. They are suitable for engines with high requirements for performance and ride comfort and with VVT; spiral tensioners have complex structure and high cost. The rebound distance of the plunger is generally within 0.5mm. It is suitable for engines with low requirements for performance and ride comfort, without VVT and with inclined arrangement on the whole vehicle. It can be seen that the rebound distance of each tensioner is fixed. If the rebound distance of the tensioner needs to be adjusted, the structure of the tensioner needs to be redesigned and manufactured, which will greatly increase the production cost. Therefore, the existing technology has the problem of troublesome adjustment of the rebound distance. Summary of the invention

[0003] The purpose of the present invention is to provide a tapered elastic sleeve type tensioner for a timing system of an automobile engine and an adjustment method thereof. The present invention has the characteristic of being able to flexibly and arbitrarily adjust the rebound distance.

[0004] The technical solution of the present invention is as follows: a conical elastic sleeve type tensioner for a timing system of an automobile engine comprises a housing, an oil inlet hole is arranged at the rear end of the housing, a one-way valve cover, a one-way valve assembly, a return spring, a throttle valve and a plunger are arranged in sequence on the side of the oil inlet hole, an annular conical groove is arranged at the rear end of the plunger, a matching elastic sleeve is sleeved on the annular conical groove; an annular groove matching the elastic sleeve is arranged on the inner wall of the housing, and an annular limiting groove is also arranged at the front end of the housing.

[0005] In the aforementioned tapered elastic sleeve type tensioner for automobile engine timing system, the annular groove comprises an annular groove body, and a tapered locking surface is provided on the side surface of the annular groove body.

[0006] In the aforementioned tapered elastic sleeve type tensioner for automobile engine timing system, the annular tapered groove comprises an annular groove body, and a tapered guide surface is provided on the side surface of the annular groove body.

[0007] In the aforementioned conical elastic sleeve type tensioner for automobile engine timing system, the elastic sleeve includes an annular sleeve body made of spring steel, a group of bending plates are provided at the end of the annular sleeve body, and U-shaped grooves are provided between adjacent bending plates; the annular sleeve body is also provided with a rolled seam.

[0008] In the aforementioned tapered elastic sleeve type tensioner for automobile engine timing system, the inclination angle of the tapered guide surface is set to β, and the tapered angle of the bending plate is set to β+3 to 5°.

[0009] In the aforementioned tapered elastic sleeve type tensioner for automobile engine timing system, the groove width of the annular groove body is set to S, the width of the annular sleeve body is set to K, and the rebound distance X is the difference between S and K.

[0010] In the aforementioned tapered elastic sleeve type tensioner for automobile engine timing system, the range of the rebound distance is 0-6 mm.

[0011] The invention discloses a method for adjusting the rebound distance of a tensioner used in a tapered elastic sleeve type automobile engine timing system, wherein the rebound distance is adjusted by adjusting the groove width of an annular tapered groove and the width of the elastic sleeve.

[0012] Compared with the prior art, the present invention sets an annular conical groove at the front end of the plunger, sets an elastic sleeve on the annular conical groove, sets an annular groove matching the elastic sleeve on the inner wall of the shell, and uses the elastic sleeve to realize the check of the plunger. Under the premise of ensuring the rebound reliability, it is only necessary to adjust the groove width of the annular conical groove and the width of the elastic sleeve to realize the arbitrary and flexible adjustment of the rebound distance. The structure is simple, the operation and installation are convenient, and the production cost can be effectively reduced. At the same time, since the rebound distance can be adjusted arbitrarily, the tensioner of the present invention only needs to change the size of the annular conical groove and the elastic sleeve accordingly to meet the requirements of different engines, and there is no need to change the overall structure of the tensioner, thereby effectively reducing the production cost and expanding the scope of application. Due to the wide scope of application, the parts can form standardized and large-scale production, which can further reduce the production cost. In summary, the present invention has the characteristics of being able to flexibly and arbitrarily adjust the rebound distance. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the structure of the present invention;

[0014] Figure 2 It is a structural diagram of the rebound distance;

[0015] Figure 3 It is the assembly schematic diagram of the present invention (maximum stroke of the plunger);

[0016] Figure 4 It is a schematic diagram of the structure of the plunger;

[0017] Figure 5 It is a structural view of the width of the elastic sleeve;

[0018] Figure 6 It is a structural schematic diagram of an elastic sleeve.

[0019] The marks in the accompanying drawings are: 1-housing, 2-check valve cover, 3-check valve assembly, 4-reset spring, 5-throttle valve, 6-plunger, 7-elastic sleeve, 8-annular conical groove, 9-annular groove, 10-oil inlet hole, 11-annular limit groove, 901-annular groove body, 902-conical locking surface, 801-annular groove body, 802-conical guide surface, 701-annular sleeve body, 702-bending plate, 703-U-shaped groove, 704-rolled joint, β-inclination angle of conical guide surface, S-groove width of the annular groove body, K-width of the annular sleeve body, X-rebound distance. DETAILED DESCRIPTION

[0020] The present invention is further described below in conjunction with the accompanying drawings and embodiments, but they are not intended to limit the present invention.

[0021] Embodiment. A conical elastic sleeve type tensioner for a timing system of an automobile engine, comprising: Figures 1 to 6 As shown, it includes a shell 1, the rear end of the shell 1 is provided with an oil inlet hole 10, and the side of the oil inlet hole 10 is provided with a one-way valve cover 2, a one-way valve assembly 3, a return spring 4, a throttle valve 5 and a plunger 6 in sequence, and the rear end of the plunger 6 is provided with an annular conical groove 8, and the annular conical groove 8 is sleeved with a matching elastic sleeve 7; the inner wall of the shell 1 is provided with an annular groove 9 matching with the elastic sleeve 7, and the front end of the shell 1 is also provided with an annular limit groove 11.

[0022] The annular groove 9 includes an annular groove body 901 , and a conical locking surface 902 is provided on the side surface of the annular groove body 901 .

[0023] The annular conical groove 8 includes an annular groove body 801 , and a conical guide surface 802 is provided on the side of the annular groove body 801 .

[0024] The elastic sleeve 7 comprises an annular sleeve body 701 made of spring steel, a group of bending plates 702 are provided at the end of the annular sleeve body 701 , and U-shaped grooves 703 are provided between adjacent bending plates 702 ; a rolled seam 704 is also provided on the annular sleeve body 701 .

[0025] The inclination angle of the tapered guide surface 802 is set to β, and the tapered angle of the bending plate 702 is set to β+3° to 5°, preferably β+4°.

[0026] The conical angle of the bent plate is formed in two parts. The β angle is formed by pressing when making the raw material, and then bent 3 to 5 degrees after being rolled into a sleeve.

[0027] The groove width of the annular groove body 801 is set to S, the width of the annular sleeve body 701 is set to K, and the rebound distance X is the difference between S and K.

[0028] The range of the rebound distance is generally 0-6 mm.

[0029] The invention discloses a method for adjusting the rebound distance of a tensioner used in a tapered elastic sleeve type automobile engine timing system, wherein the rebound distance is adjusted by adjusting the groove width of an annular tapered groove and the body width of the elastic sleeve.

[0030] It includes a housing 1 located outside, a one-way valve assembly 3 installed behind the oil inlet hole 10 of the housing 1, the one-way valve assembly 3 is connected to a return spring 4, the return spring 4 supports the throttle valve 5 and the plunger 6 to reciprocate, an annular conical groove is provided on the plunger 6, a non-return elastic sleeve 7 is installed in the annular conical groove, one end of the elastic sleeve 7 is bent and expanded into a cone, which can match the annular conical groove on the plunger 6, and an annular limit groove is also provided at the front end of the housing 1;

[0031] The annular limiting groove at the front end of the housing 1 is used to limit the maximum stroke of the plunger 6. It should be ensured that the annular limiting groove at the front end has sufficient edge thickness to resist the impact of the elastic sleeve 7, which should generally be greater than 1 mm.

[0032] The one-way valve assembly 3 can determine whether to have a one-way valve spring according to the performance requirements of the engine. If a one-way valve spring is provided, the one-way valve opening pressure should be within the range of 10-50 KPa.

[0033] The rebound distance of the plunger 6 can be set arbitrarily between 0-6 mm.

[0034] The labyrinth shape of the throttle valve 5 can adjust the flow rate of the lubricating oil, and the flow rate can be arbitrarily adjusted within the range of 50-350 ml / min.

[0035] The tensioning pressure of the return spring 4 in the entire working stroke should be within the range of 2‰-12‰ of the tensile strength of the timing chain.

[0036] The rebound distance of the present invention can be arbitrarily set within the range of 0-6 mm by adjusting the groove width dimension S on the plunger 6. When the structural dimension K of the elastic sleeve 7 is determined, the rebound distance is the difference between S and K, and the size of the difference should be greater than the maximum amplitude of the tensioner plunger during the CAE analysis of the timing system.

[0037] The elastic sleeve 7 in the present invention can be set as a standard part, which is formed by using spring steel 65Mn material through a special mold. The bent part produces permanent elasticity after heat treatment. During assembly, the one-way valve cover 2 and the one-way valve assembly 3 are first pressed into the housing 1, and then the elastic sleeve 7 is pushed into the annular groove of the housing 1. Finally, the return spring 4, the throttle valve 5 and the plunger 6 are placed in the housing 1 in sequence, and the plunger 6 is slowly pressed into place with force and the latch is inserted to complete the assembly.

[0038] When the tensioner is installed and used, the pin is pulled out, and the plunger 6, under the combined action of the return spring 4 and the oil pressure, drives the elastic sleeve 7 to move forward until the tensioning rail is compressed. When the chain is worn and elongated, the plunger continues to move forward until the elastic sleeve 7 is stuck in the annular limit groove of the housing 1, and the plunger 6 reaches the maximum stroke.

Claims

1. A conical elastic sleeve type tensioner for an automobile engine timing system, comprising a housing (1), an oil inlet hole (10) being provided at the rear end of the housing (1), a check valve cover (2), a check valve assembly (3), a return spring (4), a throttle valve (5) and a plunger (6) being provided on the side of the oil inlet hole (10), characterized in that: The rear end of the plunger (6) is provided with an annular conical groove (8), and a matching elastic sleeve (7) is sleeved on the annular conical groove (8); the inner wall of the housing (1) is provided with an annular groove (9) matching the elastic sleeve (7), and the front end of the housing (1) is also provided with an annular limiting groove (11); The annular groove (9) comprises an annular groove body (901), and a conical locking surface (902) is provided on the side surface of the annular groove body (901); The annular conical groove (8) comprises an annular groove body (801), and a conical guide surface (802) is provided on the side surface of the annular groove body (801); The elastic sleeve (7) comprises an annular sleeve body (701) made of spring steel, a group of bending plates (702) are provided at the end of the annular sleeve body (701), and U-shaped grooves (703) are provided between adjacent bending plates (702); and a rolled seam (704) is also provided on the annular sleeve body (701).

2. The tapered elastic sleeve type tensioner for automobile engine timing system according to claim 1, characterized in that: The inclination angle of the tapered guide surface (802) is set to β, and the tapered angle of the bending plate (702) is set to β+3-5°.

3. The tapered elastic sleeve type tensioner for automobile engine timing system according to claim 1, characterized in that: The groove width of the annular groove body (801) is set to S, the width of the annular sleeve body (701) is set to K, and the rebound distance X is the difference between S and K.

4. The tapered elastic sleeve type tensioner for automobile engine timing system according to claim 3, characterized in that: The range of the rebound distance is 0-6 mm.

5. A method for adjusting the rebound distance of a tapered elastic sleeve type tensioner for an automobile engine timing system according to any one of claims 1 to 4, characterized in that: The rebound distance can be adjusted by adjusting the groove width of the annular conical groove and the width of the elastic sleeve.

Images