CN113153928B - Clutch release fork assembly - Google Patents

Abstract

The invention discloses a clutch release fork assembly. The novel fork comprises a separating shifting fork body, wherein two rollers are oppositely arranged on two shifting fork heads of the separating shifting fork body, and the outer surfaces of the rollers are drum-shaped structures with small diameters at two ends and large diameters in the middle. The outer ring of the roller adopts an arc curved surface, so that the deflection angles of different angles under the working conditions of the whole vehicle vibration and the torsion of the release bearing can be smoothly contacted, and the uniform stress of the release fork assembly and the release bearing assembly is ensured.

Description

Clutch release fork assembly

Technical Field

The invention belongs to the technical field of automobiles, and particularly relates to a clutch release fork assembly which is used for a pull-type clutch control system of a heavy-duty commercial vehicle.

Background

The clutch is a component directly connected with an engine in a transmission system of the automobile, is positioned between the engine and a gearbox, and controls the separation and combination of the clutch through a clutch operating mechanism so as to cut off or transmit power input by the engine to the gearbox. Currently, the existing clutch operating mechanism generally includes a clutch pedal, a release fork connected to the clutch pedal, and a release bearing connected to the release fork.

The clutch shift fork is as the key spare part of clutch, play the key effect in whole clutch operation, current clutch shift fork is when using, because the shift fork body adopts the gliding mode in surface to be connected with the release bearing junction, the friction between clutch shift fork and the release bearing has been increased, the wearing and tearing of clutch shift fork have been accelerated, simultaneously when carrying out the fit operation with release bearing, often can transmit the high-frequency vibration that the power supply transmitted and the noise that produces because of the vibration for release bearing and driver together.

A clutch release fork structure patent No.: 201920340813.3, the release fork including a release fork body and a flexible release fork bushing; a bushing matching hole is formed in one end face of the separating shifting fork body and is a blind hole; the flexible separation shifting fork bushing comprises a cylindrical bushing seat and a circular ring coaxially arranged on the outer end face of the cylindrical bushing seat, and a plurality of through grooves are formed in the side wall of the circular ring; an arc-shaped groove is formed in the center of the outer end face of the cylindrical bushing seat; the outer diameter of the cylindrical bushing seat is matched with the inner diameter of the blind hole; the height of the flexible separation shifting fork bushing is matched with the depth of the blind hole; the arc-shaped groove is matched with the head of the push rod of the clutch cylinder in shape. The clutch release fork body has no roller structure, the contact surface of the release fork assembly and the clutch release bearing assembly is non-rolling friction, the friction resistance is large, the phenomena of abnormal sound, hair clamping and the like easily occur when the clutch is separated, and the characteristics of the smoothness of the clutch pedal force, the system noise, the fluctuation of separation and combination points and the like are greatly influenced.

This clutch separation shift fork bush ball socket does not have chip removal structure, and the ball socket surface can't in time be discharged to the dust after booster push rod and bush wearing and tearing, easily piles up the unusual wearing and tearing of ball socket with higher speed.

This clutch release shift fork bush area jack catch structure, whole car installation with when dismantling the clutch booster, the gearbox has carried out the partial shipment with the engine, the space has sealed, the clutch booster mounting hole is little, is difficult for observing release shift fork bush ball cup, the difficult bush ball cup that aims at of booster push rod bulb, the jack catch problem of splitting easily appears.

A clutch release fork assembly patent No.: 201410616430.6, the clutch release fork assembly comprises a release fork with two fork legs, two roller assemblies are oppositely arranged on the two fork legs of the release fork, a fork shaft for driving the release fork to move is arranged on the release fork, a shaft sleeve is sleeved outside the fork shaft, and the shaft sleeve is arranged on the release fork. The roller of the clutch release shifting fork assembly has no dustproof structure, and when the whole vehicle is under severe working conditions, the high temperature and dust generated by the exceeding standard of the sliding friction work of the clutch easily cause the roller to enter ash, and the dry friction inside the roller easily causes the blocking fault.

When the clutch is separated and combined, the release bearing has a torsion working condition on a shaft of the gearbox, the side surface of the roller and the matching surface of the release bearing are easy to rub with each other, and the end surface of the roller is abnormally abraded after the whole vehicle is used for a certain distance, so that the roller is subjected to faults of card distribution, frame scattering and the like.

Disclosure of Invention

The invention aims to solve the defects of the prior art, provides a clutch release fork assembly, solves the problems that the roller and a release bearing of the release fork are easy to be worn by dust, the body of the release fork is easy to deform and break, the release fork bush and a push rod are easy to be worn and the like in the working process of the existing clutch release fork assembly,

the technical scheme adopted by the invention is as follows: the utility model provides a clutch release shift fork assembly, includes the separation shift fork body, be equipped with two gyro wheels on two shift fork heads of separation shift fork body in opposite directions, the surface of gyro wheel is the drum-shaped structure that the diameter is big in the middle of the both ends diameter is little. The surface of the drum-shaped structure is a circular arc curved surface, so that the slip angles of different angles under the working conditions of vibration of the whole vehicle and torsion of the release bearing can be smoothly contacted, and the uniform stress of the release fork assembly and the release bearing assembly is ensured

Further, the gyro wheel includes gyro wheel outer lane, first O type circle, second O type circle, location base, kingpin and round pin axle, the round pin axle is including the big diameter section and the minor diameter section of coaxial arrangement, the outside portion and the interior surface fit of gyro wheel outer lane of kingpin, the inside portion of kingpin and the surface fit of the big diameter section of round pin axle, the kingpin both ends are sealed through first O type circle and second O type circle respectively, location base cover is in the position of minor diameter section and the handing-over of big diameter section, location base surface and gyro wheel outer lane interior surface contact, the hole interference fit on the minor diameter section and the separation of round pin axle are pulled out and are pitched the body. The roller 8 (bearing) is filled in the roller, and after high-temperature-resistant lubricating grease is injected, the left end and the right end of the roller are sealed by O-shaped rings, so that the roller can bear large radial force while meeting the requirements of dust prevention and high temperature. The pin shaft adopts a step structure, so that the installation and the disassembly of the roller outer ring and the positioning base are convenient.

Furthermore, one side of the shifting fork head is provided with a protruding part used for limiting along the radial direction of the roller.

Further, the clearance between the inner side surface of the protruding part and the outer side surface of the separating bearing lug is smaller than the clearance between the side end surface of the roller and the side surface of the separating bearing. When the release shifting fork swings, the inner side surface of the extending part is preferentially eliminated and contacted with the outer side surface of the release bearing lug seat, so that the side end surface of the roller is protected from being contacted and abraded with the release bearing. Due to the limiting effect of the extending part, only the arc surface is contacted when the roller pulls the release bearing, the abrasion of the side end surface is avoided, and the sealing reliability of the roller is ensured.

Furthermore, the cross surface of the inner side of the separation shifting fork body is of a variable cross-section structure.

Further, the ball socket at the bottom of the separation shifting fork body is of a non-blind hole structure.

Furthermore, the through hole in the ball socket is located on one side of the diameter of the ball socket, and the through hole is arranged on one side of the ball socket, so that no shearing force is generated between the through hole and the bottom of the bush when the push rod applies force to the bush.

Furthermore, a bushing matched with the push rod ball head is arranged in the ball socket, the bushing is made of high-temperature engineering plastics, the highest heat-resistant temperature is 316 ℃, and the ball socket has excellent heat-resistant performance (Tm is 316 ℃), chemical corrosion resistance, low water absorption, good dimensional stability and excellent comprehensive performance.

Furthermore, the inner ball socket of the bushing is divided into two sections, the bottom section is a hemispherical groove matched with the ball head of the push rod, the top section is a conical surface guide opening, and a variable-section chip groove is formed in the bushing.

Furthermore, the outer part of the bushing is provided with a knurled structure, and the outer diameter of the knurled structure is in interference fit with the ball socket.

The middle part of the separation shifting fork body adopts a variable cross-section structure, and the variable cross-section part can bear larger clutch separation force, so that higher separation efficiency is ensured.

The outer ring of the roller adopts an arc curved surface, so that the deflection angles of different angles under the working conditions of the whole vehicle vibration and the torsion of the release bearing can be smoothly contacted, and the uniform stress of the release fork assembly and the release bearing assembly is ensured. The roller is internally filled with the needle roller bearing, and after high-temperature-resistant lubricating grease is injected, the left end and the right end of the roller are sealed by O-shaped rings, so that the roller can bear large radial force while meeting the requirements of dust prevention and high temperature. The roller pin shaft adopts a step structure, so that the roller outer ring and the positioning base can be conveniently installed and detached, and the pin shaft is in interference fit with the inner hole of the separation shifting fork body.

The extending part arranged on the shifting fork head plays a limiting role, only the arc surface is contacted when the roller pulls the release bearing, the abrasion of the side end surface is avoided, and the reliability of roller sealing is ensured.

The ball socket part at the bottom of the separating shifting fork body adopts a non-blind hole design, the reserved small through hole can exhaust gas to ensure that the shifting fork is installed in place when the bushing is installed, and meanwhile, the small through hole is arranged at one side of the ball socket to ensure that no shearing force is generated between the through hole and the bottom of the bushing when the push rod applies force to the bushing.

The separating shifting fork has a larger lever ratio and better self strength, simplifies a clutch separating mechanism connected with the separating shifting fork, does not need to be periodically added with lubricating grease for maintenance in the using process, has longer service life, reduces fault points in the using process, improves the appearance quality and has more reasonable structure.

Drawings

FIG. 1 is a schematic structural diagram of the present invention.

Fig. 2 is an exploded view of the roller of the present invention.

FIG. 3 is a cross-sectional view of the roller of the present invention.

Fig. 4 is a schematic view of the fork head and release bearing assembly of the present invention.

Fig. 5 is a plan view of the fork head and release bearing assembly of the present invention.

Fig. 6 is a perspective view of the bushing of the present invention.

Fig. 7 is a bottom schematic view of the bushing of the present invention.

In the drawings, 1-the split yoke body; 2-shifting fork head; 3, rolling wheels; 4-roller outer ring; 5-a first O-ring; 6-a second O-ring; 7-positioning a base; 8-rolling needles; 9-a pin shaft; 9.1-large diameter section; 9.2-small diameter section; 10-an extension; 11-a cross plane; 12-a ball and socket; 13-a through hole; 14-a bushing; 15-bottom section; 16-a top section; 17-chip groove; 18-a knurled structure; 19-a groove; 20-release of the bearing; 21-ear seat.

Detailed Description

The following further describes embodiments of the present invention with reference to the drawings. It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

Where the terms "comprising", "having" and "including" are used in this specification, there may be another part or parts unless otherwise stated, and the terms used may generally be in the singular but may also be in the plural.

It should be noted that although the terms "first," "second," "top," "bottom," "side," "other," "end," "other end," and the like may be used and used in this specification to describe various components, these components and parts should not be limited by these terms. These terms are only used to distinguish one element or section from another element or section. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element, with the top and bottom elements being interchangeable or switchable with one another, where appropriate, without departing from the scope of the present description; the components at one end and the other end may be of the same or different properties to each other.

Further, in constituting the component, although it is not explicitly described, it is understood that a certain error region is necessarily included.

In describing positional relationships, for example, when positional sequences are described as being "on.. above", "over.. below", "below", and "next", unless such words or terms are used as "exactly" or "directly", they may include cases where there is no contact or contact therebetween. If a first element is referred to as being "on" a second element, that does not mean that the first element must be above the second element in the figures. The upper and lower portions of the component will change depending on the angle of view and the orientation. Thus, in the drawings or in actual construction, if a first element is referred to as being "on" a second element, it can be said that the first element is "under" the second element and the first element is "over" the second element. In describing temporal relationships, unless "exactly" or "directly" is used, the description of "after", "subsequently", and "before" may include instances where there is no discontinuity between steps.

The features of the various embodiments of the present invention may be partially or fully combined or spliced with each other and performed in a variety of different configurations as would be well understood by those skilled in the art. Embodiments of the invention may be performed independently of each other or may be performed together in an interdependent relationship.

As shown in fig. 1-7, the invention provides a clutch release fork assembly, which comprises a release fork body 1, wherein a cross surface 11 on the inner side of the middle part of the release fork body 1 is of a variable cross-section structure, the middle part of the release fork body 1 adopts the variable cross-section structure, and the variable cross-section part reduces the local stress of the fork assembly, can bear larger clutch release force and ensures higher release efficiency.

In the above scheme, two rollers 3 are oppositely arranged on two shifting fork heads 2 of the separation shifting fork body 1, and the outer surfaces (i.e. outer rings of the rollers) of the rollers 3 are drum-shaped structures with small diameters at two ends and large diameters in the middle. Specifically, the roller 3 comprises a roller outer ring 4, a first O-shaped ring 5, a second O-shaped ring 6, a positioning base 7, a roller pin 8 and a pin shaft 9, the pin shaft 9 comprises a large-diameter section 9.1 and a small-diameter section 9.2 which are coaxially arranged, the outer side portion of the roller pin 8 is matched with the inner surface of the roller outer ring 4, the inner side portion of the roller pin 8 is matched with the outer surface of the large-diameter section 9.1 of the pin shaft 9, the two ends of the roller pin 8 are respectively sealed through the first O-shaped ring 5 and the second O-shaped ring 6, the positioning base 7 is sleeved at the position where the small-diameter section 9.2 is connected with the large-diameter section 9.1, the outer surface of the positioning base 7 is in contact with the inner surface of the roller outer ring 4, and the small-diameter section of the pin shaft 9 is in interference fit with a hole in the separation fork body 1.

The surface of the roller outer ring 4 adopts an arc curved surface, so that the deflection angles of different angles under the working conditions of whole vehicle vibration and separation bearing torsion can be smoothly contacted, and the separation shifting fork assembly and the separation bearing assembly are uniformly stressed. The roller 3 is internally filled with roller pins 8 (bearings), and after high-temperature-resistant lubricating grease is injected, the left end and the right end of the roller are sealed by O-shaped rings, so that the roller can bear large radial force while meeting the requirements of dust prevention and high temperature. The pin shaft 9 adopts a step structure, so that the roller outer ring 4 and the positioning base 7 can be conveniently installed and detached.

In the scheme, one side of the shifting fork head 2 is provided with the extending part 10 used for limiting along the radial direction of the roller, and the gap between the inner side surface 10.1 of the extending part 10 and the outer side surface of the separating bearing lug seat 21 is smaller than the gap between the side end surface 3.1 of the roller 3 and the side surface of the separating bearing 20. The surface of the protruding part is subjected to a heat treatment process, and the side end face of the roller is protected from being abraded through limiting.

The extension part 10 has a limiting function, after the whole vehicle separation fork is assembled with the separation bearing 20, the inner side surface 10.1 of the extension part 10 at the fork head 2 is in clearance fit with the outer side surface of the separation bearing lug seat 21, the clearance is a1, the side end surface 3.1 of the roller 3 is in clearance fit with the side surface of the separation bearing 20, the clearance is a2, and a1 is smaller than a 2. When the release fork swings, the gap a1 is preferably eliminated and contacted, and the side end face of the roller is protected from being contacted and worn with the release bearing. The limiting function of the extension part 10 ensures that only the arc surface is contacted when the roller pulls the release bearing, and the abrasion of the side end surface is avoided, thereby ensuring the sealing reliability of the roller.

In the scheme, the ball socket 12 at the bottom of the separating shifting fork body 1 is of a non-blind hole structure, the ball socket 12 is of a non-blind hole design, the through hole 13 in the ball socket 12 is located on one side of the diameter of the ball socket, the reserved small through hole 13 can exhaust gas to ensure that the ball socket is installed in place when a bushing is installed, and meanwhile, the through hole 13 is arranged on one side of the ball socket 12 to ensure that no shearing force is generated between the through hole and the bottom of the bushing when a push rod applies force to the bushing.

A bushing 14 for mating with the putter ball is disposed within the socket 12. The bushing 14 is made of high-temperature engineering plastic, has the highest heat-resistant temperature of 316 ℃, has excellent heat-resistant performance (Tm is 316 ℃), chemical corrosion resistance, low water absorption, good dimensional stability and excellent comprehensive performance. The ball socket in the bush 14 is divided into two sections, the bottom section 15 is a hemispherical groove matched with the push rod ball head, and the top section 16 is a conical guide opening, so that the assembly of the push rod ball head is facilitated. The inner part of the lining 14 is provided with a variable-section chip groove 17, and the chip groove 17 is used for solving the problem of accelerated abrasion of the plastic lining caused by powder accumulation after abrasion. The outside of bush 14 is knurling structure 18, knurling structure 18 external diameter with ball socket 12 interference fit, interference fit all play with the knurling structure and prevent changeing the effect, reduce bush and push rod and bush and the mutual wearing and tearing of shift fork ball socket. The bottom of the bushing 14 adopts a quadrilateral groove 19, which structurally ensures the requirements of buffering and flexibility and is beneficial to the smoothness of clutch separation.

According to the invention, the ball socket is processed into the bush matching hole, the flexible separation shifting fork bush is assembled in the bush matching hole, and the bush separates the separation shifting fork from the push rod, so that the direct contact between the separation shifting fork and the clutch slave cylinder push rod is avoided, when the bush is worn to a certain extent and needs to be replaced, the operation is more convenient, the cost for replacing the separation shifting fork and the push rod can be saved, and meanwhile, the vibration and impact in the separation process can be reduced.

The outer diameter of the ring is gradually reduced from the position close to the outer end face of the cylindrical bushing seat to the position far away from the outer end face of the cylindrical bushing seat, and the ring is provided with the through groove, so that the clutch cylinder push rod and the separation shifting fork body are convenient to assemble. According to the invention, the other end face of the separation shifting fork body is provided with the small hole communicated with the blind hole, so that the assembly of the flexible separation shifting fork bushing is facilitated.

The clutch release fork of the invention is arranged on the shell of the clutch through a release fork shaft matched with the fixed shaft hole to form a lever, the ball socket on the body is connected with a driving mechanism for driving the release fork, the roller wheel pushes the release bearing under the driving of the driving mechanism, thereby realizing the release of the clutch, and after the driving mechanism releases force, the roller wheel does not apply pressure to the release bearing, thereby realizing the natural combination of the clutch.

The clutch release fork assembly is suitable for a commercial vehicle assembled with a pull-type clutch, and compared with the existing clutch release fork, the clutch release fork assembly has the following advantages: better self-strength, simplified the clutch release mechanism who is connected with it, need not add lubricating grease at regular intervals in the use and maintain, longer life has reduced the fault point in the use, and appearance quality also improves to some extent, and the structure is more reasonable.

The clutch release fork simplifies a release device connected with the clutch release fork, is fixed on the clutch shell through the release fork shaft, has the characteristics of self-lubrication, wear resistance and the like, can better adapt to various working conditions, and does not need to be maintained by adding lubricating grease regularly; the radial movement of the release bearing is limited by matching with the two sides of the release bearing, which is completely different from the existing product, the release bearing can be ensured to reciprocate on the same axis, the fault point is reduced, and the structure is more reasonable; the separating shifting fork rod is larger, so that the clutch can be separated by a small force for the booster pump; the working face of this clutch release shift fork is also different with current product, and like products are mostly the fixed working face of circular arc shape, have used for a long time to have very obvious grinding mark, influence the normal separation of clutch, and this clutch release shift fork promotes release bearing through release roll, makes the clutch separation, and in the course of the work, the rotation that release roll can be free is more reasonable than like products's atress.

The separating shifting fork assembly can replace the roller with a similar structure according to factors such as cost, working conditions and the like, and is characterized in that a roller pin structure is omitted inside the roller, and only two ends are sealed. The alternative scheme can be suitable for scenes with good working conditions and low bearing capacity requirements. The bushing with a similar structure can be replaced according to the factors such as cost, working conditions and the like, the plastic bushing is changed into the steel bushing, and the relationship between the bushing and the push rod is changed from flexible connection into rigid connection. The alternative scheme can be suitable for scenes with extremely severe working conditions and high bearing requirements.

The invention also provides a clutch assembly, which comprises a box body, a driven shaft arranged in the box body, a release bearing sleeved outside the driven shaft and a release fork matched with the release bearing, wherein the release fork is the release fork assembly; the hydraulic push rod can move along the axial direction thereof, thereby pushing (or pulling) the motion of the separation fork; the hydraulic push rod is parallel to the driven shaft, so that the maximum utilization of the hydraulic pressure of the hydraulic push rod is facilitated, the mechanism can be compactly arranged, and the arrangement space is saved; the hydraulic push rod pushes the release fork to drive the release bearing to move towards the power source of the engine, the clutch pressure plate release finger is pressed, the driven plate and the clutch pressure plate are changed from a pressing state to a release state after certain displacement, and the power source is cut off, so that the gear shifting condition of the transmission is realized; the invention solves the difficulty of the whole vehicle arrangement by the characteristics of the hydraulic system, has small clutch force and low user operation intensity, can eliminate the clearance between the release bearing and the clutch pressure plate, and avoids the maintenance requirement that the mechanical clutch mechanism needs to adjust the clutch clearance in time.

The assembly also comprises a dust cover which is connected with the box body and the hydraulic pump and forms an isolation space for accommodating the hydraulic push rod and the separating shifting fork, so that the protection effect on the hydraulic push rod and the separating shifting fork is favorably realized, the hydraulic push rod and the separating shifting fork are prevented from being corroded by external dust, and the service life of the mechanism is prolonged; the dust cover accessible fastening bolt connects in the box, and is equipped with the positioning seat that is used for with hydraulic pump cooperation location on the dust cover, the installation of the hydraulic pump of being convenient for.

The outer surface of the box body is sequentially provided with an acid washing layer, an anticorrosive layer and a wear-resistant layer from inside to outside; the pickling layer is formed by pickling the tank body, and for example, the pickling layer can be formed by using a mixture of HF, HNO 3: pickling the acid solution with H2O-1: 1:10 at 60-80 ℃ for 4-6 hours, so that not only is the cleanliness of the box body ensured, but also harmful trace elements are well treated; the anti-corrosion layer has an anti-corrosion effect, and the wear-resistant layer has a wear-resistant effect; the thicknesses of the pickling layer, the anticorrosive layer and the wear-resistant layer can be determined according to actual needs; the protective layer formed by the pickling layer, the anticorrosive layer and the wear-resistant layer can effectively prolong the service life of the box body; the anticorrosion layer comprises an anticorrosion inner layer and an anticorrosion outer layer, the anticorrosion inner layer is an epoxy resin coating, and the anticorrosion outer layer is a phosphating film layer; the epoxy resin coating is stable to alkali and most solvents, has the characteristics of compactness, water resistance, good leakage resistance, high strength and the like, and meanwhile, has strong adhesive force and can be operated at normal temperature; the epoxy resin coating is arranged outside the pickling layer and can have larger thickness; the phosphating film layer is an insoluble phosphate film (formed by treating a zinc phosphate solution for example) and effectively enhances the rust prevention performance of parts; the opposite surfaces of the anticorrosion inner layer and the anticorrosion outer layer are in a matched corrugated shape; the upper surface of the anticorrosion inner layer is attached to the lower surface of the anticorrosion outer layer, and the two surfaces form a fluctuant groove structure due to the corrugation, so that the connection stability of the anticorrosion inner layer and the anticorrosion outer layer can be effectively improved; the wear-resistant layer is a Ni-Al-based alloy coating; the Ni-Al based alloy coating reduces the friction factor between related parts and the outside and effectively improves the wear resistance of the parts; the Ni-Al based alloy coating can adopt the Ni-Al wear-resistant composite material and the preparation method disclosed by CN 103215576A, for example.

The above description is only an embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Those not described in detail in this specification are well within the skill of the art.

Claims (8)

1. The utility model provides a clutch release shift fork assembly, includes separation shift fork body (1), two shifting fork heads (2) of separation shift fork body (1) are gone up and are equipped with two gyro wheels (3) its characterized in that in opposite directions: the outer surface of the roller (3) is of a drum-shaped structure with small diameters at two ends and large diameter in the middle; one side of the shifting fork head (2) is provided with a protruding part (10) for limiting along the radial direction of the roller; the clearance between the inner side surface of the extension part (10) and the outer side surface of the separation bearing lug is smaller than the clearance between the side end surface of the roller and the side surface of the separation bearing.

2. The clutch release fork assembly of claim 1, wherein: the roller (3) comprises a roller outer ring (4), a first O-shaped ring (5), a second O-shaped ring (6), a positioning base (7), a roller pin (8) and a pin shaft (9), the pin shaft (9) comprises a large-diameter section and a small-diameter section which are coaxially arranged, the outer side portion of the roller pin (8) is matched with the inner surface of the roller outer ring (4), the inner side portion of the roller pin (8) is matched with the outer surface of the large-diameter section of the pin shaft (9), the two ends of the roller pin (8) are sealed through the first O-shaped ring (5) and the second O-shaped ring (6) respectively, the positioning base (7) is sleeved at the position where the small-diameter section is jointed with the large-diameter section, the outer surface of the positioning base (7) is in contact with the inner surface of the roller outer ring (4), and the small-diameter section of the pin shaft (9) is in interference fit with a hole on the separation shifting fork body.

3. The clutch release fork assembly of claim 1, wherein: the cross surface (11) on the inner side of the separation shifting fork body (1) is of a variable cross-section structure.

4. The clutch release fork assembly of claim 1, wherein: the ball socket (12) at the bottom of the separation shifting fork body (1) is of a non-blind hole structure.

5. The clutch release fork assembly of claim 4, wherein: the through hole (13) on the ball socket (12) is positioned on one side of the diameter of the ball socket.

6. The clutch release fork assembly of claim 4, wherein: and a bushing matched with the push rod ball head is arranged in the ball socket (12), the bushing is made of high-temperature engineering plastics, and the highest heat-resistant temperature is 316 ℃.

7. The clutch release fork assembly of claim 6, wherein: the ball socket in the bushing (14) is divided into two sections, the bottom section (15) is a hemispherical groove matched with the ball head of the push rod, the top section (16) is a conical surface guide opening, and a chip groove (17) with a variable cross section is arranged in the bushing (14).

8. The clutch release fork assembly of claim 6, wherein: the outer part of the bushing (14) is of a knurled structure, and the outer diameter of the knurled structure is in interference fit with the ball socket (12).

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