Tensioning wheel for body dynamic seal

Abstract

The utility model relates to the technical field of automobiles, in particular to a body dynamic seal tensioning wheel which comprises a spring supporting sleeve, a rocker arm, a sealing ring I, a center shaft, a sealing ring II, a spring, a bearing bush, a pressure bearing bush, a lining, a belt pulley, a bearing, a front dustproof cover, a rear dustproof cover and a bolt. A first dynamic sealing structure is formed, a second dynamic sealing structure is formed by adding a rubber sealing ring II to a gap between the flange face of the center shaft and the rocker arm, dynamic sealing of the tensioning wheel body is achieved by adding the first sealing structure and the second sealing structure formed by the rubber sealing rings to the tensioning wheel body, abnormal invasion into the tensioning wheel body can be effectively prevented, and the service life of the tensioning wheel body is prolonged. The body dynamic seal tensioning wheel can adapt to an engine working under severe dust and slurry conditions, so that the service life of the tensioning wheel is prolonged, and the maintenance cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of automobiles, in particular to a dynamic seal tensioner for the body of an automobile engine. Background Art

[0002] With the development of the automobile industry, the application fields of automobile engines are becoming wider and wider. Some engines need to operate under harsh working conditions, such as dump trucks, sanitation trucks, mining trucks, etc. As an important part of the engine gear train accessories, under harsh working conditions, foreign objects can easily invade the inside of the tensioner body, accelerating the wear of the moving friction parts inside the tensioner, causing abnormal wear of the tensioner, and ultimately leading to the failure of the tensioner. In this context, it is necessary to develop a dynamic seal tensioner for the body to protect the inside of the tensioner body from being polluted, thereby improving the service life of the tensioner, reducing the maintenance cost, and improving user satisfaction. Content of the Utility Model

[0003] Aiming at the deficiencies of the prior art, the utility model provides a dynamic seal tensioner for the body, which has the advantages of being able to adapt to engines working under harsh dust and mud conditions, improving the service life of the tensioner, reducing the maintenance cost, etc., and solves the problems of short service life of the tensioner and high maintenance cost.

[0004] A dynamic seal tensioner for the body of the utility model includes a spring support sleeve, a rocker arm, a sealing ring I, a central shaft, a sealing ring II, a spring, a bearing bush, a pressure bearing bush, a bushing, a pulley, a bearing, a front dust cover, a rear dust cover and a bolt. A rubber sealing ring I is added at the gap between the rocker arm and the spring support sleeve to form a first dynamic seal structure. A rubber sealing ring II is added at the gap between the flange surface of the central shaft and the rocker arm to form a second dynamic seal structure. Through the first and second seal structures formed by adding rubber sealing rings on the tensioner body, the dynamic seal of the tensioner body is realized, and abnormal intrusion into the tensioner body can be effectively prevented, so that the internal friction parts of the tensioner are protected from pollution, thereby improving the service life of the tensioner.

[0005] In a dynamic seal tensioner for the body of the utility model, the sealing ring I is wrapped on the spring support sleeve by vulcanization process between the spring support sleeve and the sealing ring I to form a spring support sleeve rubberized component. The central shaft is a multi-step structure and includes a central through hole. Vulcanized rubber is coated on the flange surface of the central shaft. The sealing ring II is wrapped on the central shaft by vulcanization process between the central shaft and the sealing ring II to form a central shaft rubberized component.

[0006] In a dynamic seal tensioner for the body of the utility model, the spring support sleeve is provided with a cavity, an installation positioning pin, an installation positioning surface, a central hole and a spring hook groove.

[0007] A body dynamic seal tensioner of the present utility model, wherein the sealing ring I needs to meet the working temperature of -40°C to 130°C, and the material is preferably ACM, and fluororubber can also be selected. The rocker arm is provided with a cavity, a cylindrical surface, a central hole, a spring hook groove, a multi-step structure and a threaded hole. The gap between the rocker arm and the support plate forms a first dynamic seal structure through the sealing lip of the sealing ring I contacting the rocker arm, and the gap between the central shaft and the rocker arm forms a second dynamic seal structure through the sealing lip of the sealing ring II contacting the rocker arm.

[0008] A body dynamic seal tensioner of the present utility model, wherein the spring is a cylindrical torsion spring, including two hooks. The bearing bush is a cylindrical structure, and a positioning boss is arranged on the bottom surface; a positioning step is arranged on the outer cylindrical surface. The pressure bearing bush is a cylindrical structure, and a positioning notch is arranged on the cylindrical surface. The pressure bearing bush is sleeved on the bearing bush, and the inner cavity of the bearing bush contacts the cylindrical surface of the rocker arm. The bushing is a wear-resistant part, and the material is preferably made of steel back + PTFE composite, and wear-resistant nylon can also be selected.

[0009] A body dynamic seal tensioner of the present utility model, wherein the spring support sleeve, the rocker arm, the sealing ring I, the central shaft, the sealing ring II, the spring, the bearing bush, the pressure bearing bush, and the bushing are coaxial and fixedly connected through the central shaft. When the tensioner works, the rocker arm swings around the central shaft.

[0010] A body dynamic seal tensioner of the present utility model, wherein the bearing is a contact seal bearing, and annular grooves are arranged on both sides of the pulley. The outer ring of the bearing is in interference fit with the inner ring of the pulley, and the inner ring of the bearing and the positioning step of the rocker arm are preferably in clearance fit.

[0011] A body dynamic seal tensioner of the present utility model, wherein a front dust cover and a rear dust cover are respectively installed on both sides of the pulley, and the front dust cover and the rear dust cover form a sealed dust-proof structure with the annular groove of the pulley.

[0012] A body dynamic seal tensioner of the present utility model, wherein the pulley, the bearing, the front dust cover, and the rear dust cover are connected to the threaded hole of the rocker arm through bolts.

[0013] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0014] 1. By adding the first and second sealing structures formed by rubber sealing rings on the tensioner body, the dynamic seal of the tensioner body is realized, and abnormal intrusion into the tensioner body can be effectively prevented, so that the internal friction parts of the tensioner are protected from pollution, and the body dynamic seal tensioner can adapt to engines working under harsh dust and mud conditions, thereby improving the service life of the tensioner and reducing the maintenance cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings described herein are used to provide a further understanding of the present application and form a part of the present application. The schematic embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation to the present application. In the drawings:

[0016] Figure 1 It is a cross-sectional view of a tension pulley with a body dynamic seal for a utility model;

[0017] Figure 2 It is a top view of a tension pulley with a body dynamic seal for a utility model;

[0018] Figure 3 It is a three-dimensional view of a tension pulley with a body dynamic seal for a utility model;

[0019] Figure 4 It is a three-dimensional view of a rubber-coated component of a spring support sleeve for a utility model;

[0020] Figure 5 It is a three-dimensional view of a rubber-coated component of a central shaft for a utility model.

[0021] In the figure: 1. Spring support sleeve; 2. Rocker arm; 3. Seal ring I; 4. Central shaft; 5. Seal ring II; 6. Spring; 7. Bearing bush; 8. Pressure bearing bush; 9. Bushing; 10. Pulley; 11. Bearing; 12. Front dust cover; 13. Rear dust cover; 14. Bolt. Detailed implementation manners

[0022] The following will disclose multiple implementation manners of the present utility model with diagrams. For the sake of clear illustration, many practical details will be described together in the following narration. However, it should be understood that these practical details should not be used to limit the present utility model. That is to say, in some implementation manners of the present utility model, these practical details are not necessary. In addition, for the purpose of simplifying the diagrams, some well-known and commonly used structures and components will be shown in a simple schematic manner in the diagrams.

[0023] Please refer to Figures 1-5 , a tension pulley with a body dynamic seal of the present utility model includes: a spring support sleeve 1, a rocker arm 2, a seal ring I 3, a central shaft 4, a seal ring II 5, a spring 6, a bearing bush 7, a pressure bearing bush 8, a bushing 9, a pulley 10, a bearing 11, a front dust cover 12, a rear dust cover 13, and a bolt 14.

[0024] The present utility model provides a dynamic seal tension pulley for the body, which adds a rubber sealing ring at the gap between the rocker arm 2 and the spring support sleeve 1 to form a first dynamic seal structure; at the same time, a rubber sealing ring is added at the gap between the flange surface of the central shaft 4 and the rocker arm 2 to form a second dynamic seal structure. Through the first and second seal structures formed by adding rubber sealing rings on the tension pulley body, the dynamic seal of the tension pulley body is realized, which can effectively prevent abnormal intrusion into the tension pulley body, protect the internal friction parts of the tension pulley from contamination, and thus improve the service life of the tension pulley;

[0025] The dynamic seal tension pulley for the body includes adding a rubber sealing ring I 3 at the gap between the rocker arm 2 and the spring support sleeve 1 to form a first dynamic seal structure;

[0026] A rubber sealing ring II 5 is added at the gap between the flange surface of the central shaft 4 and the rocker arm 2 to form a second dynamic seal structure;

[0027] The spring support sleeve 1 and the sealing ring I 3 adopt a vulcanization process to wrap the sealing ring I 3 on the spring support sleeve 1 to form a spring support sleeve rubber-coated component;

[0028] The central shaft 4 is a multi-step structure and includes a central through hole;

[0029] Vulcanized rubber is applied to the flange surface of the central shaft 4;

[0030] The central shaft 4 and the sealing ring II 5 adopt a vulcanization process to wrap the sealing ring II 5 on the central shaft 4 to form a central shaft rubber-coated component;

[0031] The spring support sleeve 1 is provided with a cavity, an installation positioning pin, an installation positioning surface, a central hole, and a spring 6 hook groove;

[0032] The sealing ring I 3 is an annular structure and includes one or more sealing lips;

[0033] The sealing ring I 3 needs to meet the working temperature of -40°C to 130°C, and the material is preferably ACM, or fluororubber can also be selected;

[0034] The rocker arm 2 is provided with a cavity, a cylindrical surface, a central hole, a spring hook groove, a multi-step structure, and a threaded hole;

[0035] The gap between the rocker arm 2 and the support plate forms a first dynamic seal structure through the contact between the sealing lip of the sealing ring I 3 and the rocker arm 2;

[0036] The gap between the central shaft 4 and the rocker arm 2 forms a second dynamic seal structure through the contact between the sealing lip of the sealing ring II 5 and the rocker arm 2;

[0037] The spring 6 is a cylindrical torsion spring 6 and includes two hooks;

[0038] The bearing shell 7 is of a cylindrical structure, with a positioning boss provided on the bottom surface; a positioning step is provided on the outer cylindrical surface;

[0039] The pressure bearing shell 8 is of a cylindrical structure, with a positioning notch provided on the cylindrical surface;

[0040] The pressure bearing shell 8 is sleeved on the bearing shell 7, and the inner cavity of the bearing shell 7 is in contact with the cylindrical surface of the rocker arm 2;

[0041] The bushing 9 is a wear-resistant part, and the material is preferably made of a combination of steel back and PTFE, or wear-resistant nylon can also be selected;

[0042] The spring support sleeve 1, the rocker arm 2, the sealing ring I 3, the central shaft 4, the sealing ring II 5, the spring 6, the bearing shell 7, the pressure bearing shell 8, and the bushing 9 are coaxial and fixedly connected through the central shaft 4. When the tension pulley works, the rocker arm 2 swings around the central shaft 4;

[0043] The bearing 11 is a contact-type sealed bearing;

[0044] Annular grooves are provided on both sides of the pulley 10;

[0045] The outer ring of the bearing 11 and the inner ring of the pulley 10 are in interference fit, and the inner ring of the bearing 11 and the positioning step of the rocker arm 2 are preferably in clearance fit;

[0046] A front dust cover 12 and a rear dust cover 13 are respectively installed on both sides of the pulley 10, and the front and rear dust covers and the annular groove of the pulley 10 form a sealed dust-proof structure;

[0047] The pulley 10, the bearing 11, the front dust cover 12, and the rear dust cover 13 are connected to the threaded holes of the rocker arm 2 through bolts 14.

[0048] Working principle: The body dynamic seal tension pulley provides a rubber sealing ring added at the gap between the rocker arm 2 and the spring support sleeve 1 of the tension pulley to form a first dynamic seal structure; at the same time, a rubber sealing ring is added at the gap between the flange surface of the central shaft 4 and the rocker arm 2 to form a second dynamic seal structure. Through the first and second seal structures formed by adding rubber sealing rings on the tension pulley body, the dynamic seal of the tension pulley body is realized, which can effectively prevent abnormal intrusion into the tension pulley body, protect the internal friction parts of the tension pulley from pollution, and thus improve the service life of the tension pulley.

[0049] The above is only the implementation mode of the present invention and is not used to limit the present invention. For those skilled in the art, various changes and modifications can be made to the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the scope of the claims of the present invention.

Claims

1. A main body dynamic seal tensioner, comprising a spring support sleeve (1), a rocker arm (2), a seal ring I (3), a center shaft (4), a seal ring II (5), a spring (6), a bearing (7), a pressure bearing (8), a bushing (9), a pulley (10), a bearing (11), a front dust cover (12), a rear dust cover (13) and bolts (14), characterized in that: A rubber sealing ring I (3) is added to the gap between the rocker arm (2) and the spring support sleeve (1) to form a first dynamic sealing structure, and a rubber sealing ring II (5) is added to the gap between the flange surface of the central shaft (4) and the rocker arm (2) to form a second dynamic sealing structure.

2. The main body dynamic seal tensioner according to claim 1, characterized in that: The spring support sleeve (1) and the sealing ring I (3) are vulcanized to wrap the sealing ring I (3) around the spring support sleeve (1) to form a spring support sleeve rubber-coated assembly. The central shaft (4) is a multi-step structure and includes a central through hole. The central shaft (4) is coated with vulcanized rubber on the flange surface. The central shaft (4) and the sealing ring II (5) are vulcanized to wrap the sealing ring II (5) around the central shaft (4) to form a central shaft rubber-coated assembly.

3. The main body dynamic seal tensioner according to claim 1, characterized in that: The spring support sleeve (1) is provided with a cavity, an installation positioning pin, an installation positioning surface, a center hole, and a spring hook groove.

4. The main body dynamic seal tensioner according to claim 1, characterized in that: The sealing ring I (3) is an annular structure and includes one or more sealing lips. The sealing ring I (3) needs to meet the working temperature range of -40°C to 130°C and is made of ACM. The rocker arm (2) is provided with a cavity, a cylindrical surface, a center hole, a spring hook groove, a multi-step structure and a threaded hole. The gap between the rocker arm (2) and the support plate is in contact with the rocker arm (2) through the sealing lip of the sealing ring I (3) to form a first dynamic sealing structure, and the gap between the central shaft (4) and the rocker arm (2) is in contact with the rocker arm (2) through the sealing lip of the sealing ring II (5) to form a second dynamic sealing structure.

5. The main body dynamic seal tensioner according to claim 1, characterized in that: The spring (6) is a cylindrical torsion spring, comprising two hooks; the bearing (7) is a cylindrical structure, with a positioning boss provided on the bottom surface; a positioning step is provided on the outer cylindrical surface; the pressure bearing (8) is a cylindrical structure, with a positioning notch provided on the cylindrical surface; the pressure bearing (8) is sleeved on the bearing (7), with the inner cavity of the bearing (7) in contact with the cylindrical surface of the rocker arm (2); the bushing (9) is a wear-resistant part, and the material is a composite of steel back + PTFE.

6. The main body dynamic seal tensioner according to claim 1, characterized in that: The spring support sleeve (1), the rocker arm (2), the sealing ring I (3), the central shaft (4), the sealing ring II (5), the spring (6), the bearing bush (7), the pressure bearing bush (8), and the bushing (9) are coaxial and fixedly connected via the central shaft (4). When the tensioning wheel is working, the rocker arm (2) swings around the central shaft (4).

7. The main body dynamic seal tensioner according to claim 1, characterized in that: The bearing (11) is a contact-type sealed bearing, annular grooves are provided on both sides of the pulley (10), the outer ring of the bearing (11) is interference-fitted with the inner ring of the pulley (10), and the inner ring of the bearing (11) is clearance-fitted with the positioning step of the rocker arm (2).

8. The main body dynamic seal tensioner according to claim 1, characterized in that: A front dust cover (12) and a rear dust cover (13) are respectively mounted on both sides of the belt pulley (10); the front dust cover (12) and the rear dust cover (13) form a sealed dustproof structure with the annular groove of the belt pulley (10).

9. The main body dynamic seal tensioner according to claim 1, characterized in that: The pulley (10), the bearing (11), the front dust cover (12), and the rear dust cover (13) are connected to the threaded hole of the rocker arm (2) via bolts (14).

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