Double-support type clutch release fork assembly

Abstract

The utility model discloses a double support type clutch release fork assembly which comprises a release fork body and a shift fork support which are connected with each other, a first through hole is formed in the rotating center of the release fork body, the shift fork support comprises a mounting plate, a pair of supporting frames with the same structure is arranged on the mounting plate, second through holes are formed in the supporting frames, and the second through holes are communicated with the first through hole. The second through hole and the first through hole are coaxially arranged; a knuckle bearing is installed in the first through hole, a shifting fork shaft is arranged in the knuckle bearing, first ring grooves are formed in the two ends of the shifting fork shaft, first clamping springs are installed in the first ring grooves to fix the shifting fork shaft, the two ends of the shifting fork shaft are each sleeved with a positioning shifting fork shaft sleeve, and one end of each positioning shifting fork shaft sleeve makes contact with the side wall of the shaft washer. According to the shifting fork support, due to the double supports of the shifting fork support and the positioning structures at the two ends of the shifting fork shaft, the radial clearance of the shifting fork shaft relative to the shifting fork support is reduced, and the problem that the positioning faces of parts are abraded is solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of automobiles and relates to a release fork assembly, in particular to a double-support type clutch release fork assembly. Background Art

[0002] The mechanical transmissions of medium and heavy-duty commercial vehicles are usually equipped with pull-type clutches, and the clutch release fork assembly is a key component. The clutch release fork assembly is usually composed of a release fork, a release fork bracket and a fork shaft. The release fork bracket is installed on the corresponding housing of the transmission, and the release fork is installed on the release fork bracket through the fork shaft. When the power pump output force pushes the power lever, it acts on one end of the release fork. The fork shaft acts as a fulcrum to rotate the release fork, and the other end of the release fork drives the release bearing to separate or engage the clutch.

[0003] The existing separation fork assembly is as follows Figure 1 to Figure 4 As shown, it is usually composed of a Y-shaped separation fork body and a T-shaped fork bracket. Coaxially arranged through holes are opened at the rotation center of the separation fork body and the corresponding position of the fork bracket. The through hole of the fork bracket is arranged between the through holes of the separation fork body. The separation fork body is fitted with the fork bracket. A joint bearing is embedded in the through hole of the fork bracket. Generally, a fork shaft is used to pass through the through hole and the joint bearing in sequence, and the end is fixed by a nut to fix the separation fork body and the fork bracket relatively. The surface opposite to the fork foot of the separation fork body is the fork foot positioning surface, which contacts and positions the separation bearing positioning surface, and the fork foot of the separation fork body contacts and transmits force to the working surface of the separation bearing. At this time, the separation fork body can rotate around the fork shaft relative to the fork bracket through the joint bearing, so that the separation fork body drives the separation bearing to move forward and backward relative to the bearing cover. However, there is a matching clearance between the through-hole position of the release fork body and the fork bracket, and the fork shaft is supported on the fork bracket by a single spherical bearing. There will be radial clearance and radial deflection during the rotation of the release fork body around the fork shaft, resulting in asymmetric force on the fork foot positioning surface of the release fork body relative to the two sides of the release bearing, and finally eccentric wear occurs on the positioning surface of the release bearing, reducing the performance and service life of the components. Summary of the invention

[0004] In view of the shortcomings of the prior art, the purpose of the utility model is to provide a double-supported clutch release fork assembly, which can solve the technical problems that when the existing release fork body rotates around the fork shaft, there is a radial gap and radial deflection, and the release fork body and the release bearing positioning surface are prone to eccentric wear.

[0005] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0006] A double-support clutch release fork assembly, comprising a release fork body and a fork bracket connected to each other, wherein a first through hole is provided at the rotation center of the release fork body, and the fork bracket comprises a mounting plate, and a pair of support frames with the same structure are provided on the mounting plate, wherein the pair of support frames are provided on both axial sides of the first through hole, and a second through hole is provided on the support frame, and the second through hole is provided coaxially with the first through hole;

[0007] A spherical bearing is coaxially installed in the first through hole, and the spherical bearing includes a shaft ring and a seat ring. A fork shaft is axially inserted in the shaft ring. Two ends of the fork shaft pass through the first through hole and the second through hole in sequence and extend to the outside of the support frame. Both ends of the fork shaft are provided with a first annular groove along the circumferential direction. A first retaining spring is installed in the first annular groove, and the first retaining spring contacts the lateral outer side wall of the support frame.

[0008] A positioning fork sleeve is respectively mounted on both ends of the fork shaft, one end of the positioning fork sleeve contacts the side wall of the shaft ring, and the other end of the positioning fork sleeve contacts the inner side wall of the support frame.

[0009] The utility model also includes the following technical features:

[0010] The inner wall of the first through hole is provided with a second annular groove along the circumferential direction, and a second retaining spring is arranged in the second annular groove. The second retaining spring contacts the outer wall of the seat ring to fix the spherical bearing in the first through hole.

[0011] The positioning fork sleeve comprises a coaxially integrated top pressure ring and a fixed ring platform, the movable end of the top pressure ring contacts the side wall of the shaft ring, and the movable end of the fixed ring platform contacts the inner side wall of the support frame;

[0012] The outer diameter of the pressing ring is smaller than the outer diameter of the fixed end of the fixed ring platform, and the outer diameter of the pressing ring is not larger than the minimum inner diameter of the seat ring.

[0013] The outer diameter of the movable end of the fixed ring stage is larger than the diameter of the second through hole, and the outer diameter of the fixed end of the fixed ring stage is smaller than the diameter of the first through hole.

[0014] The fork shaft is also provided with a pair of annular dust covers, which are mounted on the top pressure ring on the same side. The outer diameter of the dust cover is clearance matched with the diameter of the first through hole, and the inner diameter of the dust cover is interference matched with the outer diameter of the top pressure ring.

[0015] The axial thickness of the dust cover is the distance between the side wall of the seat ring and the fixed end of the fixed ring stage.

[0016] The transverse ends of the mounting plate are provided with mounting holes penetrating the mounting plate in the longitudinal direction, and fixing bolts are arranged in the mounting holes.

[0017] The spherical bearing is a lubrication-free bearing.

[0018] The dust cover is a non-metallic dust cover.

[0019] Compared with the prior art, the utility model has the following technical effects:

[0020] The double-supported clutch release fork assembly in the utility model has a larger axial spacing between the two support frames for supporting the fork bracket, so that the radial clearance of the fork shaft relative to the fork bracket is reduced; the fork shaft sleeve is axially clamped between the joint bearing and the support frame, and a compression and positioning effect is played on the shaft ring in both directions to keep it fixed, so that the fork shaft is axially positioned and fixed relative to the fork bracket without radial deviation, thereby ensuring that the fork foot positioning surface and the release bearing positioning surface, as well as the fork foot and the release bearing working surface are not prone to eccentric wear when contacting or transmitting force, thereby improving the performance and service life of the components. The provision of the dust cover prevents dust and other foreign matter from entering the cavity surrounded by the components, thereby avoiding wear and improving the service life of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 The invention is a schematic assembly diagram of a clutch release fork assembly in the prior art.

[0022] Figure 2 It is a structural schematic diagram of a separation fork body in the prior art.

[0023] Figure 3 It is a structural schematic diagram of a shift fork bracket in the prior art.

[0024] Figure 4 It is a partial cross-sectional view of a clutch release fork assembly in the prior art.

[0025] Figure 5 It is a partial cross-sectional view of the separation fork body of the utility model.

[0026] Figure 6 It is a side view of the separation fork body of the utility model.

[0027] Figure 7 It is a structural schematic diagram of the shift fork bracket of the utility model.

[0028] Figure 8 It is an exploded schematic diagram of the assembly of the clutch release fork assembly of the utility model.

[0029] Fig. 9 It is a side view of the clutch release fork assembly of the utility model.

[0030] Fig.10 yes Fig. 9 DD cross-sectional view.

[0031] Fig.11 It is an assembly schematic diagram of a clutch release fork assembly of the utility model.

[0032] Fig.12 yes Fig.11 Side view of.

[0033] The meaning of each number in the figure is:

[0034] 1. release fork body, 2. fork bracket, 3. first through hole, 4. joint bearing, 5. fork shaft, 6. first ring groove, 7. first retaining spring, 8. second ring groove, 9. second retaining spring, 10. fork sleeve, 11. dust cover, 12. transmission housing, 13. release bearing, 14. bearing cover, 15. second mounting hole, 16. fixing bolt, A. release bearing locating surface, B. release bearing working surface, C. fork foot locating surface;

[0035] 2-1, mounting plate, 2-2, support frame, 2-3, second through hole, 2-4, first mounting hole;

[0036] 4-1, shaft ring, 4-2, seat ring;

[0037] 10-1, top pressure ring, 10-2, fixed ring table.

[0038] The specific contents of the utility model are further explained in detail below in conjunction with the embodiments. DETAILED DESCRIPTION

[0039] In accordance with the above technical solution, specific embodiments of the present utility model are given below. It should be noted that the present utility model is not limited to the following specific embodiments, and all equivalent changes made on the basis of the technical solution of this application fall within the protection scope of the present utility model.

[0040] In the present utility model, unless otherwise specified, directional words such as "upper", "lower", "left", "right", etc. are usually defined based on the drawings in the corresponding accompanying drawings, "inside" and "outside" refer to the inside and outside of the contour of the corresponding components, and "longitudinal", "transverse", "axial" and "circumferential" refer to the directions marked in the drawings.

[0041] Example:

[0042] This embodiment provides a double-support clutch release fork assembly, such as Figures 5 to 12As shown, it includes a separation fork body 1 and a fork bracket 2 connected to each other, a first through hole 3 is opened at the rotation center of the separation fork body 1, and is characterized in that the fork bracket 2 includes a mounting plate 2-1, a pair of support frames 2-2 with the same structure are arranged on the mounting plate 2-1, the pair of support frames 2-2 are arranged on both axial sides of the first through hole 3, and a second through hole 2-3 is opened on the support frame 2-2, and the second through hole 2-3 is coaxially arranged with the first through hole 3;

[0043] A spherical bearing 4 is coaxially installed in the first through hole 3, and the spherical bearing 4 includes a shaft ring 4-1 and a seat ring 4-2. A fork shaft 5 is axially inserted in the shaft ring 4-1. Both ends of the fork shaft 5 pass through the first through hole 3 and the second through hole 2-3 in sequence and extend to the outside of the support frame 2-2. Both ends of the fork shaft 5 are circumferentially provided with a first annular groove 6. A first retaining spring 7 is installed in the first annular groove 6. The first retaining spring 7 contacts the lateral outer side wall of the support frame 2-2.

[0044] Furthermore, a positioning fork sleeve 10 is respectively mounted on both ends of the fork shaft 5, one end of the positioning fork sleeve 10 contacts the side wall of the shaft ring 4-1, and the other end of the positioning fork sleeve 10 contacts the inner wall of the support frame 2-2.

[0045] In this embodiment, the separation fork body 1 is composed of an integrally arranged shift rod and a shift fork, and the whole is a Y-shaped structure. The shift fork is composed of a pair of fork feet with the same structure and symmetrical arrangement. The fork foot positioning surface C contacts and positions the release bearing positioning surface A, and the fork foot contacts and transmits force to the release bearing working surface B. The rotation center of the separation fork body 1 is located on the shift rod, and the inner diameter of the shaft ring 4-1 and the diameter of the second through hole 2-3 are matched with the diameter of the fork shaft 5. A pair of support frames 2-2 double-support the two ends of the fork shaft 5 to improve the stability of the fork shaft 5 during operation. The positioning fork sleeve 10 is connected between the shaft ring 4-1 and the support frame 2-2, and cooperates with the fixing effect of the first retaining spring 7 to compress and position the shaft ring 4-1 in both directions. The double support structure of the fork bracket 2 and the positioning effect of the positioning fork sleeve 10 reduce the radial clearance when the separation fork body 1 rotates around the fork shaft 5, thereby improving the eccentric wear between the fork foot positioning surface C and the positioning surface A.

[0046] As a preferred scheme of this embodiment, a second annular groove 8 is circumferentially provided on the inner wall of the first through hole 3 in this embodiment, and a second retaining spring 9 is arranged in the second annular groove 8. The second retaining spring 9 contacts the outer wall of the seat ring 4-2 to axially fix the joint bearing 4 in the first through hole 3. Preferably, in this embodiment, there are two second annular grooves 8 axially arranged side by side, and second retaining springs 9 are arranged in both second annular grooves 8. The setting of double retaining springs can stably clamp and fix the seat ring 4-2, thereby improving the stability of the joint bearing 4 relative to the first through hole 3.

[0047] As a preferred solution of this embodiment, the positioning fork sleeve 10 in this embodiment includes a coaxially integrated top pressure ring 10-1 and a fixed ring stage 10-2, the movable end of the fixed ring stage 10-2 contacts the inner side wall of the support frame 2-2, the movable end of the top pressure ring 10-1 contacts the side wall of the shaft ring 4-1, the fixed ring stage 10-2 is a trapezoidal structure, the outer diameter of the fixed end of the fixed ring stage 10-2 is larger than the outer diameter of the movable end of the fixed ring stage 10-2, and the outer diameter of the top pressure ring 10-1 is The outer diameter of the top pressure ring 10-1 is smaller than the outer diameter of the fixed end of the fixed ring stage 10-2, and the outer diameter of the top pressure ring 10-1 is not greater than the minimum inner diameter of the seat ring 4-2. The above size restrictions prevent the top pressure ring 10-1 from contacting the side wall of the seat ring 4-2, ensuring that the spherical bearing 4 can operate normally. The inner hole diameters of the top pressure ring 10-1 and the fixed ring stage 10-2 are the same and match the diameter of the fork shaft 5, which can prevent the positioning fork sleeve 10 from shifting in both axial and radial directions, thereby improving the overall stability during operation.

[0048] Furthermore, the outer diameter of the movable end of the fixed ring stage 10-2 is larger than the diameter of the second through hole 2-3, which prevents the movable end of the fixed ring stage 10-2 from being inserted into the second through hole 2-3, causing the positioning fork sleeve 10 to slip outward and fail to play a clamping and positioning role; the outer diameter of the fixed end of the fixed ring stage 10-2 is smaller than the diameter of the first through hole 3, ensuring that the positioning fork sleeve 10 can penetrate into the first through hole 3, so that the movable end of the top pressure ring 10-1 is in top pressure contact with the side wall of the shaft ring 4-1.

[0049] As a preferred solution of this embodiment, a pair of annular dust covers 11 are also mounted on the fork shaft 5 in this embodiment. The dust cover 11 is mounted on the top pressure ring 10-1 on the same side. The inner diameter of the dust cover 11 matches the outer diameter of the top pressure ring 10-1. The outer diameter of the dust cover 11 matches the diameter of the first through hole 3. A cavity is formed between the positioning fork sleeve 10, the seat ring 4-2, the second retaining ring 9 and the first through hole 3. Dust and other foreign matter can easily enter the cavity, causing wear on components. The dust cover 11 can prevent this from happening, reduce the wear on components and increase their service life.

[0050] Furthermore, in this embodiment, the axial thickness of the dust cover 11 is the distance between the side wall of the seat ring 4 - 2 and the fixed end of the fixed ring stage 10 - 2 , which further improves the dustproof effect of the dust cover 11 .

[0051] As a preferred solution of this embodiment, the dust cover 11 in this embodiment is a non-metallic dust cover to prevent the dust cover 11 from rubbing against other parts during the operation of the device, thereby preventing the parts from being worn.

[0052] As a preferred solution of this embodiment, in this embodiment, first mounting holes 2-4 that penetrate the mounting plate 2-1 are longitudinally opened at both lateral ends of the mounting plate 2-1, and second mounting holes 15 are opened at corresponding positions of the transmission housing 12. Fixing bolts 16 are arranged in the mounting holes 2-4, and the assembled clutch release fork assembly is fixedly mounted on the transmission housing 12 by the fixing bolts 16.

[0053] As a preferred solution of this embodiment, the spherical bearing 4 in this embodiment is a lubrication-free bearing, which can operate normally without adding lubricating oil or grease and maintain a good wear-reducing effect.

[0054] In actual operation of this embodiment, the assembled release bearing 13 and bearing cover 14 are installed in the corresponding positions of the transmission housing 12 through the bearing cover 14, and then the assembled double-supported clutch release fork assembly is installed in the corresponding position of the transmission housing 12 through the fork bracket 2. After installation, the fork foot positioning surface C contacts and positions the release bearing positioning surface A, and the two support frames 2-2 on the fork bracket 2 double-support the fork shaft 5. The axial spacing between the two support frames 2-2 is large, so the radial clearance of the fork shaft 5 relative to the fork bracket 2 is relatively reduced; the fork shaft sleeve 10 is axially inserted between the joint bearing 4 and the support frame 2-2, so that the fork shaft 5 is axially positioned and fixed relative to the fork bracket 2 without radial deviation, thereby ensuring that the fork foot positioning surface C and the release bearing positioning surface A, the fork foot and the release bearing working surface B are not prone to eccentric wear during contact and force transmission.

Claims

1. A double-support clutch release fork assembly, comprising a release fork body (1) and a fork bracket (2) connected to each other, wherein a first through hole (3) is provided at the rotation center of the release fork body (1), characterized in that: The fork bracket (2) comprises a mounting plate (2-1), a pair of support frames (2-2) having the same structure are arranged on the mounting plate (2-1), the pair of support frames (2-2) are arranged on both axial sides of the first through hole (3), a second through hole (2-3) is opened on the support frame (2-2), and the second through hole (2-3) is coaxially arranged with the first through hole (3); A spherical bearing (4) is coaxially installed in the first through hole (3), the spherical bearing (4) comprises a shaft ring (4-1) and a seat ring (4-2), a shift fork shaft (5) is axially inserted in the shaft ring (4-1), two ends of the shift fork shaft (5) pass through the first through hole (3) and the second through hole (2-3) in sequence and extend to the outside of the support frame (2-2), a first annular groove (6) is circumferentially formed at both ends of the shift fork shaft (5), a first retaining spring (7) is installed in the first annular groove (6), and the first retaining spring (7) contacts the lateral outer side wall of the support frame (2-2); A positioning fork sleeve (10) is respectively mounted on both ends of the fork shaft (5), one end of the positioning fork sleeve (10) contacts the side wall of the shaft ring (4-1), and the other end of the positioning fork sleeve (10) contacts the inner side wall of the support frame (2-2).

2. The double-support clutch release fork assembly according to claim 1, characterized in that: The inner wall of the first through hole (3) is provided with a second annular groove (8) along the circumferential direction, and a second retaining spring (9) is arranged in the second annular groove (8). The second retaining spring (9) contacts the outer wall of the seat ring (4-2) to fix the spherical bearing (4) in the first through hole (3).

3. The double-support clutch release fork assembly according to claim 1, characterized in that: The positioning fork shaft sleeve (10) comprises a top pressure ring (10-1) and a fixed ring platform (10-2) which are coaxially arranged in one piece, the movable end of the top pressure ring (10-1) contacts the side wall of the shaft ring (4-1), and the movable end of the fixed ring platform (10-2) contacts the inner side wall of the support frame (2-2); The outer diameter of the top pressure ring (10-1) is smaller than the outer diameter of the fixed end of the fixed ring platform (10-2), and the outer diameter of the top pressure ring (10-1) is not larger than the minimum inner diameter of the seat ring (4-2).

4. The double-support clutch release fork assembly according to claim 3, characterized in that: The outer diameter of the movable end of the fixed ring platform (10-2) is greater than the diameter of the second through hole (2-3), and the outer diameter of the fixed end of the fixed ring platform (10-2) is smaller than the diameter of the first through hole (3).

5. The double-support clutch release fork assembly according to claim 3, characterized in that: The fork shaft (5) is also provided with a pair of annular dust covers (11), which are mounted on the top pressure ring (10-1) on the same side. The outer diameter of the dust cover (11) is clearance-matched with the diameter of the first through hole (3), and the inner diameter of the dust cover (11) is interference-fitted with the outer diameter of the top pressure ring (10-1).

6. The double-support clutch release fork assembly according to claim 5, characterized in that: The axial thickness of the dust cover (11) is the distance between the side wall of the seat ring (4-2) and the fixed end of the fixed ring platform (10-2).

7. The double-support clutch release fork assembly according to claim 1, characterized in that: Mounting holes (2-4) penetrating the mounting plate (2-1) are provided at both transverse ends of the mounting plate (2-1) along the longitudinal direction, and fixing bolts (16) are arranged in the mounting holes (2-4).

8. The double-support clutch release fork assembly according to claim 1, characterized in that: The spherical bearing (4) is a lubrication-free bearing.

9. The double-support clutch release fork assembly according to claim 5, characterized in that: The dust cover (11) is a non-metallic dust cover.

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