Camshaft axial clearance adjusting mechanism

Abstract

The utility model discloses a cam shaft axial clearance adjusting mechanism, which relates to the technical field of cam shaft axial clearance adjustment and comprises an adjusting component, the adjusting component consists of a threaded rod, a baffle, a plurality of rollers and a base plate, the baffle is fixedly mounted at the inner end of the threaded rod, and the rollers are rotatably mounted on the baffle. The base plate is fixedly installed at the outer end of the threaded rod, the adjusting assembly is installed on the front shell, the adjusting assembly composed of the threaded rod, the baffle, the rotating roller and the base plate is arranged, and the rotating roller is closer to the cam shaft assembly relative to other parts on the adjusting assembly, so that the axial gap of the cam shaft assembly is adjusted; the clearance between the cam shaft assembly and the rotating roller is adjusted, so that when the cam shaft assembly axially moves, contact friction can be generated between the cam shaft assembly and the rotating roller, the rotating roller can rotate when friction is generated between the rotating roller and the cam shaft assembly, the rotating resistance of the cam shaft assembly can be reduced, and therefore the rotating energy consumption of the cam shaft assembly can be reduced.

Description

Technical Field

[0001] This utility model relates to the field of camshaft axial clearance adjustment technology, and in particular to a camshaft axial clearance adjustment mechanism. Background Technology

[0002] All rotating mechanisms inside an engine have rotating shafts, such as the camshaft. Some of these shafts experience axial force, while others do not. It is essential to ensure that the shaft's axial position remains relatively fixed, and that the amount of runout is controlled within an appropriate range, so that related components maintain relatively accurate operating positions. Excessive runout can lead to misalignment of the force transmission mechanism, such as misalignment between the cam and tappet or roller; insufficient runout, under stress and heat deformation, can cause the shaft to easily seize or break. Therefore, the amount of runout, i.e., the axial clearance of the shaft, needs to be controlled. Currently, thrust washers and thrust steps are commonly used structures. The axial clearance control of current shaft parts is generally ensured by the fit between the thrust surface and the bearing housing end face or a specially installed thrust washer. However, this clearance is guaranteed by the dimensional tolerances of the parts and cannot be adjusted and guaranteed through assembly processes. For example, most existing engine camshafts use thrust washers to constrain camshaft axial clearance. This involves machining an annular thrust groove on the camshaft, fitting the thrust washer into the groove, and then bolting the washer to the engine block, thus limiting the axial movement of the camshaft relative to the engine block. However, this thrust washer structure relies entirely on the axial thrust surface of the shaft and the machining accuracy of the thrust washer. The tolerances of the parts determine the clearance after assembly, and this clearance is not adjustable. This structure demands high precision, consistency, and assembly quality from the parts, typically requiring selection and grouping based on part tolerances during assembly, increasing manufacturing costs.

[0003] The existing patent application CN202321677591.7 proposes an axial clearance adjustment structure. Although it can quickly and efficiently limit the axial movement of the camshaft relative to the machine body and achieve the purpose of adjusting the axial clearance by setting a threaded hole and adjusting screw on the front axle seat, and combining the adjusting screw and locking nut, and has a simple structure, high reliability, and relatively low manufacturing cost, the camshaft often collides and rubs with the adjusting screw when rotating, which will make the rotational resistance of the camshaft greater and thus easily increase the energy consumption of the camshaft rotation. At the same time, the adjusting screw and locking nut are threaded, so they are prone to relative rotation after vibration, which will loosen and eventually change the clearance between the camshaft and the adjusting screw. Therefore, it needs to be improved. Utility Model Content

[0004] The main objective of this invention is to provide a camshaft axial clearance adjustment mechanism, which can effectively solve the problems in the background art.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A camshaft axial clearance adjustment mechanism includes an adjustment assembly comprising a threaded rod, a baffle, a rotating roller, and a base plate. The baffle is fixedly installed on the inner end of the threaded rod. Several rotating rollers are rotatably installed on the baffle. The base plate is fixedly installed on the outer end of the threaded rod. The adjustment assembly is mounted on a front housing. A blocking assembly is fixedly installed on the outer end of the front housing. The blocking assembly is simultaneously sleeved on the outside of the adjustment assembly and coaxial with the adjustment assembly. The blocking assembly comprises a base cylinder and a collar. The collar is fixedly sleeved on the base cylinder. A limiting assembly is movably installed on the base plate. The limiting assembly comprises a spring, a base block, a T-block, and a rod. There are two base blocks symmetrically fixedly installed at both ends of the spring. There are two T-blocks, each fixedly installed on the inner end of one of the two base blocks. There are two rods, each fixedly installed on the outer wall of one of the two base blocks. The rods are simultaneously inserted into the base cylinder.

[0007] Preferably, a rear housing is fixedly installed at one end of the front housing, and a bearing is fixedly installed on both the front housing and the rear housing. A camshaft assembly is installed on the two bearings, and the camshaft assembly is coaxial with the adjustment assembly.

[0008] Preferably, a threaded hole is provided on one side wall of the front housing.

[0009] Preferably, the threaded rod on the adjusting assembly is installed in the threaded hole, the baffle is located inside the front housing and near one end of the camshaft assembly, the inner end of the baffle is provided with a plurality of roller grooves, the rotating roller is rotatably installed in the roller grooves, the base plate on the adjusting assembly is located outside the front housing, and the outer end of the base plate is symmetrically provided with two T-shaped grooves.

[0010] Preferably, the collar on the blocking assembly is fixedly installed on the outer end of the front housing by bolts, and a plurality of blocking grooves are evenly opened on the outer end of the base cylinder, and the blocking grooves pass through the inside and outside of the base cylinder.

[0011] Preferably, the T-shaped block on the limiting component is slidably installed in the T-shaped groove, the spring and the base block are both located on the outside of the base plate, and the insert rod is inserted into the retaining groove.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] By setting an adjustment assembly consisting of a threaded rod, baffle, rotating roller, and base plate, the rotating roller is closer to the camshaft assembly than other components on the adjustment assembly. Therefore, adjusting the axial clearance of the camshaft assembly, i.e., adjusting the clearance between the camshaft assembly and the rotating roller, will cause contact friction with the rotating roller when the camshaft assembly moves axially. The rotating roller can rotate when it rubs against the camshaft assembly, thus reducing the resistance to rotation of the camshaft assembly and reducing the energy consumption of the camshaft assembly. By setting a blocking component on the front housing and a limiting component on the adjustment assembly, the adjustment assembly and the front housing can be fixed relative to each other, thus preventing the adjustment assembly from rotating after being subjected to vibration. This ensures that the clearance between the adjustment assembly and the camshaft assembly will not change unexpectedly, and ultimately ensures the normal and stable operation of the camshaft assembly. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0015] Figure 2 For the present utility model Figure 1 A magnified view of point A;

[0016] Figure 3 This is a schematic diagram of the structure of the bearing, camshaft assembly, front housing, and rear housing of this utility model;

[0017] Figure 4 This is a schematic diagram of the structure of the blocking component of this utility model;

[0018] Figure 5 This is a structural schematic diagram of the adjustment component and the limiting component of this utility model from one of the following perspectives after disassembly.

[0019] Figure 6 This is a structural schematic diagram of the adjustment component and the limiting component of this utility model from another perspective after disassembly.

[0020] In the diagram: 1. Adjustment component; 2. Blocking component; 3. Limiting component; 4. Front housing; 5. Bearing; 6. Camshaft assembly; 7. Threaded hole; 8. Baffle; 9. Roller groove; 10. Rotary roller; 11. Base plate; 12. T-slot; 13. Spring; 14. Base block; 15. T-block; 16. Insert rod; 17. Base cylinder; 18. Collar; 19. Stop groove; 20. Rear housing; 21. Threaded rod. Detailed Implementation

[0021] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0022] Please see Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 As shown, a camshaft axial clearance adjustment mechanism includes an adjustment assembly 1, which consists of a threaded rod 21, a baffle 8, a rotating roller 10, and a base plate 11. The baffle 8 is fixedly installed on the inner end of the threaded rod 21. Several rotating rollers 10 are rotatably installed on the baffle 8. The base plate 11 is fixedly installed on the outer end of the threaded rod 21. The adjustment assembly 1 is installed on a front housing 4. A blocking assembly 2 is fixedly installed on the outer end of the front housing 4. The blocking assembly 2 is sleeved on the outside of the adjustment assembly 1 and is coaxial with the adjustment assembly 1. The blocking assembly 2 consists of a base cylinder 17 and a collar 18. The collar 18 is fixedly sleeved on the base cylinder 17. The base plate 11... The upper part of the 11 is equipped with a limiting component 3, which consists of a spring 13, a base block 14, a T-shaped block 15, and a rod 16. There are two base blocks 14, which are symmetrically fixed at both ends of the spring 13. There are two T-shaped blocks 15, which are fixedly fixed at the inner ends of the two base blocks 14 respectively. There are two rods 16, which are fixedly fixed on the outer walls of the two base blocks 14 respectively. The rods 16 are also inserted into the base cylinder 17. A rear housing 20 is fixedly installed at one end of the front housing 4. A bearing 5 is fixedly installed on both the front housing 4 and the rear housing 20. A camshaft assembly 6 is installed on the two bearings 5. The camshaft assembly 6 is connected to the adjusting component 1. The front housing 4 is coaxial, and a threaded hole 7 is provided on one side wall. During installation, the bearing 5 is installed on the front housing 4 and the rear housing 20. Then, the camshaft assembly 6 is installed on the two bearings 5. After that, the front housing 4 and the rear housing 20 are installed together. Finally, the adjusting component 1 can be rotated on the front housing 4 to adjust the gap between the roller 10 and the camshaft assembly 6, that is, to adjust the axial gap of the camshaft assembly 6. The method is to first push the two base blocks 14 on the limiting component 3 so that the two base blocks 14 are close to each other, so that the insert rod 16 is moved out of the blocking component 2, thereby releasing the adjusting component 1 from the front housing 4. With the housing 4 fixed, the spring 13 is compressed. Then, the adjusting component 1 can be rotated through the limiting component 3, causing the threaded rod 21 on the adjusting component 1 to rotate in the threaded hole 7. At this time, the threaded rod 21 will move the baffle 8 and the rotating roller 10. The distance between the rotating roller 10 and the camshaft assembly 6 will change. When the distance between the rotating roller 10 and the camshaft assembly 6 is appropriate, the limiting component 3 is released, so that the insertion rod 16 is finally inserted into the blocking component 2 under the elastic force of the spring 13. At this time, the adjusting component 1 and the front housing 4 are fixed relative to each other, thus completing the adjustment of the axial clearance of the camshaft assembly 6.

[0023] Therefore, by setting an adjustment assembly 1 consisting of a threaded rod 21, a baffle 8, a rotating roller 10, and a base plate 11, the rotating roller 10 is closer to the camshaft assembly 6 than other components on the adjustment assembly 1. Thus, adjusting the axial clearance of the camshaft assembly 6, i.e., adjusting the clearance between the camshaft assembly 6 and the rotating roller 10, causes the camshaft assembly 6 to make contact friction with the rotating roller 10 when it moves axially. The rotating roller 10 can rotate when it rubs against the camshaft assembly 6, thereby reducing the resistance to the rotation of the camshaft assembly 6 and thus reducing the energy consumption of the rotation of the camshaft assembly 6. By setting a blocking assembly 2 on the front housing 4 and a limiting assembly 3 on the adjustment assembly 1, the adjustment assembly 1 and the front housing 4 can be fixed relative to each other, thereby preventing the adjustment assembly 1 from rotating after being vibrated. This ensures that the clearance between the adjustment assembly 1 and the camshaft assembly 6 will not change unexpectedly, and ultimately ensures the normal and stable operation of the camshaft assembly 6.

[0024] Specifically, the threaded rod 21 on the adjusting assembly 1 is installed in the threaded hole 7. The baffle 8 is located inside the front housing 4 and close to one end of the camshaft assembly 6. Several roller grooves 9 are opened at the inner end of the baffle 8. The rotating roller 10 is rotatably installed in the roller grooves 9. The base plate 11 on the adjusting assembly 1 is located outside the front housing 4. Two T-shaped grooves 12 are symmetrically opened at the outer end of the base plate 11. When the threaded rod 21 on the adjusting assembly 1 rotates in the threaded hole 7, the threaded rod 21 will move axially with the other parts of the adjusting assembly 1. When the threaded rod 21 moves inward, the gap between the rotating roller 10 and the camshaft assembly 6 will become smaller. Conversely, the gap between the rotating roller 10 and the camshaft assembly 6 will become larger.

[0025] Specifically, the collar 18 on the blocking assembly 2 is fixedly installed on the outer end of the front housing 4 by bolts. Several grooves 19 are evenly provided on the outer end of the base cylinder 17, and the grooves 19 pass through the inside and outside of the base cylinder 17. The T-shaped block 15 on the limiting assembly 3 is slidably installed in the T-shaped groove 12. The spring 13 and the base block 14 are both located on the outside of the base plate 11. The insert rod 16 is inserted into the groove 19. When the two base blocks 14 on the limiting assembly 3 are pressed together, so that the two base blocks 14 are close to each other, the spring 13 will be compressed by the base block 14, and the insert rod 16 will move out of the groove 19. At this time, the fixing of the adjusting assembly 1 and the front housing 4 is released. Conversely, when the base block 14 is released, the insert rod 16 will move outward and reset under the elastic force of the spring 13. When the insert rod 16 is inserted into the groove 19, the adjusting assembly 1 and the front housing 4 are relatively fixed.

[0026] The above description is merely a preferred embodiment of this utility model and is not intended to limit the scope of this utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A camshaft axial clearance adjustment mechanism, characterized in that: The system includes an adjustment assembly (1), which consists of a threaded rod (21), a baffle (8), a rotating roller (10), and a base plate (11). The baffle (8) is fixedly installed on the inner end of the threaded rod (21). Several rotating rollers (10) are rotatably installed on the baffle (8). The base plate (11) is fixedly installed on the outer end of the threaded rod (21). The adjustment assembly (1) is installed on the front housing (4). A blocking assembly (2) is fixedly installed on the outer end of the front housing (4). The blocking assembly (2) is simultaneously sleeved on the outside of the adjustment assembly (1) and coaxial with the adjustment assembly (1). The blocking assembly (2) consists of... The base tube (17) and the collar (18) are composed of a base tube (17) and a collar (18). The collar (18) is fixedly sleeved on the base tube (17). A limiting component (3) is movably installed on the base plate (11). The limiting component (3) is composed of a spring (13), a base block (14), a T-shaped block (15) and a plug rod (16). There are two base blocks (14) and they are symmetrically fixedly installed at both ends of the spring (13). There are two T-shaped blocks (15) and they are respectively fixedly installed at the inner ends of the two base blocks (14). There are two plug rods (16) and they are respectively fixedly installed on the outer walls of the two base blocks (14). The plug rods (16) are simultaneously inserted into the base tube (17).

2. The camshaft axial clearance adjustment mechanism according to claim 1, characterized in that: A rear housing (20) is fixedly installed at one end of the front housing (4). A bearing (5) is fixedly installed on both the front housing (4) and the rear housing (20). A camshaft assembly (6) is installed on the two bearings (5). The camshaft assembly (6) is coaxial with the adjustment assembly (1).

3. The camshaft axial clearance adjustment mechanism according to claim 2, characterized in that: A threaded hole (7) is provided on one side wall of the front housing (4).

4. The camshaft axial clearance adjustment mechanism according to claim 3, characterized in that: The threaded rod (21) on the adjusting assembly (1) is installed in the threaded hole (7). The baffle (8) is located in the front housing (4) and close to one end of the camshaft assembly (6). The inner end of the baffle (8) is provided with several roller grooves (9). The rotating roller (10) is rotatably installed in the roller grooves (9). The base plate (11) on the adjusting assembly (1) is located on the outside of the front housing (4). The outer end of the base plate (11) is symmetrically provided with two T-shaped grooves (12).

5. The camshaft axial clearance adjustment mechanism according to claim 4, characterized in that: The collar (18) on the blocking assembly (2) is fixedly installed on the outer end of the front housing (4) by bolts. Several baffle grooves (19) are evenly opened on the outer end of the base cylinder (17), and the baffle grooves (19) simultaneously penetrate the inside and outside of the base cylinder (17).

6. The camshaft axial clearance adjustment mechanism according to claim 5, characterized in that: The T-shaped block (15) on the limiting component (3) is slidably installed in the T-shaped groove (12), the spring (13) and the base block (14) are both located on the outside of the base plate (11), and the insert rod (16) is inserted into the retaining groove (19).

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