阅读说明：本技术 转向节衬套压装工艺 (Press fitting process for steering knuckle bushing ) 是由 张运军 秦健 甘万兵 胡月帮 朱银 张涛 童伟 张天鹏 肖烈 王光富 于 2021-08-19 设计创作，主要内容包括：本发明涉及机械加工领域,公开了转向节衬套压装工艺,包括导向套和压装柱,压装柱包括伸入衬套内的定位端和伸入导向套内并推动衬套进入主销孔内的推动端,导向套侧壁插接有定位插销,定位插销栓穿过导向套并伸入到注油孔内使导向套靠近叉耳一端与衬套靠近叉耳一端相平齐。本发明具有以下优点和效果：通过带有定位凸部的导向套对衬套的压装进行定位和导向,提高了衬套压装的稳定性,在导向套上插接定位插销对注油孔与主销孔的相对位置进行定位并对衬套的放置方向进行检测,提高了衬套的压装精度；通过在导向套上设置定位孔,定位插销在定位孔内随着衬套下落对一段距离后取出,避免在衬套压装前发生周向转动,进一步提高了压装精度。(The invention relates to the field of machining, and discloses a steering knuckle bushing press-fitting process which comprises a guide sleeve and a press-fitting column, wherein the press-fitting column comprises a positioning end extending into the bushing and a pushing end extending into the guide sleeve and pushing the bushing into a main pin hole, a positioning bolt is inserted into the side wall of the guide sleeve, and the positioning bolt penetrates through the guide sleeve and extends into an oil injection hole to enable one end of the guide sleeve, which is close to a fork lug, to be flush with one end of the bushing, which is close to the fork lug. The invention has the following advantages and effects: the guide sleeve with the positioning convex part is used for positioning and guiding the press fitting of the bush, so that the stability of the press fitting of the bush is improved, the positioning bolt is inserted into the guide sleeve to position the relative position of the oil injection hole and the main pin hole and detect the placement direction of the bush, and the press fitting precision of the bush is improved; through set up the locating hole on the uide bushing, the location bolt is taken out after a section distance along with bush whereabouts in the locating hole, avoids taking place circumferential direction before the bush pressure equipment, has further improved the pressure equipment precision.)

1. The steering knuckle bushing press-fitting process is characterized in that: including uide bushing and pressure equipment post (3), pressure equipment post (3) are including stretching into location end (31) in the bush and stretching into in the uide bushing and promote promotion end (32) that the bush got into king pin hole (13), the uide bushing lateral wall is pegged graft and is had location bolt (4), location bolt (4) bolt passes the uide bushing and stretches into in oil filler point (16) and makes the uide bushing be close to fork ear one end and be close to fork ear one end looks parallel and level with the bush, the uide bushing bottom is provided with location convex part (211), location convex part (211) contact with fork ear lateral wall and make uide bushing inner wall coaxial with king pin hole (13), and pressure equipment technology includes following step:

s1: clamping and fixing the steering knuckle, so that the fork lug is positioned under the press-fitting column (3), the guide sleeve is placed on the fork lug positioned at the top, the positioning convex part (211) is contacted with the side wall of the fork lug to enable the inner wall of the guide sleeve to be concentric with the main pin hole (13) at the top, and the positioning bolt is positioned right above the oil filling hole arrangement position of the steering knuckle assembly;

s2: placing the bush in the guide sleeve to align the bottom surface of the bush with the bottom surface of the guide sleeve, and rotating the bush to align the oil injection hole (16) with the positioning hole (5);

s3: the positioning bolt (4) is slidably inserted into the oil filling hole (16), and if the positioning bolt (4) can be slidably inserted into the oil filling hole (16), the placement direction of the bush is correct; if the positioning bolt (4) cannot extend into the oil filling hole (16), the lining is placed in the wrong direction, the lining is taken out and placed in the guide sleeve in the reverse direction, and the positioning bolt (4) extends into the oil filling hole (16) through sliding to position the lining again;

s4: taking out the positioning bolt (4), and enabling the press mounting column (3) to fall down to enable the positioning end (31) to extend into the bushing to push the bushing to slide to a specified position in the main pin hole (13);

s5: the press mounting column (3) is reset to be completely separated from the guide sleeve;

s6: and (3) rotating the steering knuckle to enable the other fork lug of the steering knuckle to be arranged right below the press-fitting column (3), and repeating the steps S1-S5 to press the bushing into the fork lug at the other end.

2. A knuckle bushing press-fitting process according to claim 1, wherein: the inner wall of the positioning hole (5) is provided with a positioning hole (5) for the positioning bolt (4) to extend into and axially slide, the maximum distance for the positioning bolt (4) to slide in the positioning hole (5) is L, when the step S3 is carried out, the positioning bolt (4) slides along the top of the positioning hole (5) and extends into the oil filling hole (16), and if the positioning bolt (4) can slide along the top of the positioning hole (5) and extends into the oil filling hole (16), the placing direction of the bush is correct; if the positioning bolt (4) cannot extend into the oil filling hole (16), the lining is placed in the wrong direction, the lining is taken out and placed in the guide sleeve in the reverse direction, and the positioning bolt (4) extends into the oil filling hole (16) through sliding to position the lining again;

and S4, the press-fitting column (3) falls down to enable the positioning end (31) to extend into the bushing to push the bushing and the positioning bolt (4) to slide towards the direction close to the main pin hole (13), the sliding distance is L, wherein L is more than 0 and less than or equal to L, then the press-fitting column (3) stops or resets, the positioning bolt (4) is taken out, and the press-fitting column (3) falls down again to push the bushing to slide to the specified position in the main pin hole (13).

3. A knuckle bushing press-fitting process according to claim 2, wherein: locating hole (5) both sides wall is equipped with promotes post (6), location bolt (4) lateral wall is provided with the confession promote push chute (7) that post (6) slided and stretch into, location bolt (4) promote post (6) along with the bush whereabouts and exert thrust to promoting chute (7) and make location bolt (4) slide and break away from oil filler point (16).

4. A knuckle bushing press-fitting process according to claim 3, wherein: the positioning bolt (4) is externally provided with a limiting convex part (8), and the limiting convex part (8) is attached to the outer wall of the positioning hole (5) so that the pushing chute (7) is located right above the pushing column (6).

5. A knuckle bushing press-fitting process according to claim 1, wherein: the positioning end (31) is in clearance fit with the inner wall of the bushing, the inner wall of the guide sleeve is in clearance fit with the outer wall of the bushing, and the pushing end (32) is in clearance fit with the inner wall of the guide sleeve.

Technical Field

The invention relates to the technical field of machining, in particular to a steering knuckle bushing press-fitting process.

Background

The steering knuckle assembly is a part used on an automobile and comprises a shaft end and a frame end, wherein a steering knuckle bearing position is arranged on the shaft end, two steering knuckle lugs are arranged on the frame end, main pin holes for a main pin to penetrate through are respectively arranged on the two lugs, a bushing in interference fit is required to be installed in each main pin hole, and the bushing is pressed into the corresponding main pin hole through a press-fitting column to obtain the steering knuckle assembly. The existing bushing is similar to the bushing structure in the publication No. CN2046824U, the inner wall of the bushing is provided with a plurality of oil guide grooves and oil injection holes communicated with the oil guide grooves, the existing main pin is similar to the structure with the publication number of CN203391861U, a radial oil passage and an axial oil passage are arranged in the main pin, when oil is injected between the main pin and the bush, the steering knuckle assembly is rotated to the limit position, the radial oil duct of the main pin is aligned with the oil injection hole, lubricating oil is injected into the axial oil duct and enters the oil guide groove through the two oil ducts and the oil injection hole, the rotation between the main pin and the bush is lubricated, the relative angle between the steering knuckle bush and the steering knuckle is generally regulated when the bush is pressed and installed in the prior art, and the height of the oil hole on the bushing is standardized, so that the radial oil passage is aligned with the oil injection hole when the main pin rotates at a specific angle, and the smooth lubricating oil passage from the main pin to the knuckle bushing is ensured.

In the current bushing press-fitting process of the steering knuckle assembly, the relative angle between the steering knuckle bushing and a steering knuckle fork lug is positioned by visual inspection of an operator when the steering knuckle bushing is pressed in, and the precision is very low; for the assembly of a steering axle, a main pin of the same specification is matched with various steering knuckles, and the relative positions of the steering knuckles and the bushings of different steering knuckle assemblies in the height direction are different, so that the relative positions of the assembled bushings and the main pin in the height direction are different, and therefore in order to ensure that oil injection holes of the bushings can be aligned with radial oil passages of the main pin, the heights of the oil injection holes on the bushings of different steering knuckles are different, the press-fitting direction of the bushings needs to be determined when the bushings are pressed, in the current press-fitting process of the bushings of the steering knuckle assemblies, the press-fitting direction of the bushings is determined by visual inspection of an operator, so that the reverse press-fitting is easy to cause, and the rejection rate is high.

Disclosure of Invention

The invention aims to provide a steering knuckle bushing press-fitting process which has the effect of improving the bushing press-fitting precision.

The technical purpose of the invention is realized by the following technical scheme: the steering knuckle bushing press-fitting process comprises a guide sleeve and a press-fitting column, wherein the press-fitting column comprises a positioning end and a pushing end, the positioning end extends into the bushing and pushes the bushing to enter a main pin hole, a positioning bolt is inserted into the side wall of the guide sleeve, the positioning bolt penetrates through the guide sleeve and extends into an oil injection hole to enable one end, close to a fork lug, of the guide sleeve to be flush with one end, close to the fork lug, of the bushing, the bottom of the guide sleeve is provided with a positioning convex part, and the positioning convex part is in contact with the side wall of the fork lug to enable the inner wall of the guide sleeve to be coaxial with the main pin hole, and the press-fitting process comprises the following steps:

s1: clamping and fixing the steering knuckle, so that a fork lug of the steering knuckle is positioned under the press-fitting column, a guide sleeve is placed on the fork lug positioned at the top, a positioning convex part is contacted with the side wall of the fork lug to enable the inner wall of the guide sleeve to be concentric with a main pin hole at the top, and a positioning bolt is positioned right above an oil filling hole arrangement position of the steering knuckle assembly;

s2: placing the bush in the guide sleeve to align the bottom surface of the bush with the bottom surface of the guide sleeve, and rotating the bush to align the oil injection hole with the positioning hole;

s3: the positioning bolt is inserted into the oil filling hole in a sliding mode, and if the positioning bolt can be inserted into the oil filling hole in a sliding mode, the lining is placed in the correct direction; if the positioning bolt cannot extend into the oil filling hole, the placing direction of the bush is wrong, the bush is taken out and placed in the guide sleeve in the reverse direction, and the bush is positioned again by extending the positioning bolt into the oil filling hole through sliding;

s4: taking out the positioning bolt, and pressing the press mounting column to enable the positioning end to extend into the bushing to push the bushing to slide to the specified position in the main pin hole;

s5: the press mounting column is reset to be completely separated from the guide sleeve;

s6: and (4) rotating the steering knuckle to enable the other fork lug of the steering knuckle to be arranged right below the press-fitting column, and repeating the steps S1-S5 to press the bushing into the fork lug at the other end.

By adopting the technical scheme, the bushing is arranged in the guide sleeve when the bushing is pressed, the pressing column is pressed downwards to enable the positioning end to extend into the bushing to limit the bushing, the side wall of the bushing is prevented from being sunken inwards and deformed when the bushing is pressed, the inner wall of the guide sleeve limits the bushing, the bushing is prevented from being bulged outwards and deformed when the bushing is pressed, and the pressing precision is improved;

the positioning convex part is arranged at the bottom of the guide sleeve, and the relative position of the guide sleeve and the fork lug is positioned through the positioning convex part, so that the inner wall of the positioning sleeve and the main pin hole are concentric, and the positioning speed and the positioning effect are improved. Meanwhile, a positioning bolt is inserted into the guide sleeve, after the guide sleeve is positioned, the bushing is placed in the guide sleeve again, the bottom surface of the bushing is aligned with the bottom surface of the guide sleeve, and the bushing is rotated to enable the positioning bolt to extend into the oil filling hole in a sliding mode. On one hand, the positioning bolt positions the circumferential relative position between the oil filling hole of the bushing and the main pin hole, so that the oil filling hole is positioned right above the set position before the bushing is pressed; on the other hand, the positioning bolt can detect the press-fitting direction of the bush, and if the positioning bolt can slide along the top of the positioning hole and extend into the oil filling hole, the placing direction of the bush is correct; if the positioning bolt can not stretch into the oil filling hole, the positioning bolt indicates that the bushing is placed in the wrong direction, the bushing is taken out and reversely placed in the guide sleeve, and the positioning bolt stretches into the oil filling hole to position the bushing again through sliding, so that the finished oil filling hole can be opposite to the radial oil passage of the main pin, the press-fitting precision of the bushing is improved, and the rejection rate is reduced.

The invention is further provided with: the inner wall of the positioning hole is provided with a positioning hole for the positioning bolt to extend into and slide, the maximum distance for the positioning bolt to slide in the positioning hole is L, when the step S3 is carried out, the positioning bolt extends into the oil filling hole along the top of the positioning hole in a sliding manner, and if the positioning bolt can extend into the oil filling hole along the top of the positioning hole in a sliding manner, the placement direction of the bush is correct; if the positioning bolt cannot extend into the oil filling hole, the placing direction of the bush is wrong, the bush is taken out and placed in the guide sleeve in the reverse direction, and the bush is positioned again by extending the positioning bolt into the oil filling hole through sliding;

and step S4, the press-fitting column is pressed downwards to enable the positioning end to extend into the bushing to push the bushing and the positioning bolt to slide towards the direction close to the main pin hole, the sliding distance is L, wherein L is more than 0 and less than or equal to L, the press-fitting column stops or resets, the positioning bolt is taken out, and the press-fitting column is pressed downwards again to push the bushing to slide to the specified position in the main pin hole.

By adopting the technical scheme, the positioning hole is formed in the side wall of the guide sleeve, so that the positioning bolt can axially slide along the positioning hole, when the relative position of the oil filling hole is positioned, the top of the positioning hole is taken as a reference, and when the positioning bolt can slide along the top of the positioning hole and extend into the oil filling hole, the placement direction of the bush is correct; if the positioning bolt cannot extend into the oil filling hole, the placing direction of the bush is wrong, and the bush is taken out and reversely placed in the guide sleeve;

on the other hand, when the bushing is pressed, the bushing is slightly rotated in the circumferential direction when being just contacted with the press-fitting column due to the fact that the bushing lacks circumferential positioning initially when being pressed, the position of the oil filling hole is deviated, the press-fitting process is divided into two parts, the first part positioning bolt and the bushing are axially displaced at a distance of L, the positioning bolt circumferentially limits the bushing when entering the main pin hole, wherein L is smaller than the maximum displacement L of the positioning bolt, and the positioning bolt is prevented from colliding with the bottom of the positioning hole when axially displacing to cause damage to the positioning bolt and the bushing; the second part takes out the positioning bolt, and presses the bush into the designated position through the pressure equipment post, after the first part is accomplished, because the interference fit of bush and king pin hole for the bush is pressed by king pin hole after partly pressing into king pin hole and is carried out automatic circumference location to the bush, even take out positioning bolt bush can not produce circumferential direction, thereby improved the installation accuracy of bush.

The invention is further provided with: the locating hole both sides wall is equipped with the promotion post, location bolt lateral wall is provided with the confession promote the post and slide the promotion chute that stretches into, the location bolt promotes the post along with the bush whereabouts and applys thrust to promoting the chute and make the location bolt slide and break away from the oil filler point.

Through adopting above-mentioned technical scheme, set up the promotion post at the locating hole lateral wall, set up the promotion chute at location bolt lateral wall, continue downstream after location bolt axial displacement l, the promotion post stretches into in the drive chute and contacts with promotion chute top, continue to move down along the locating hole along with the location bolt receives oil filler point thrust, the promotion post promotes the location bolt and slides to the uide bushing outside until location bolt tip breaks away from the oil filler point completely, then the bush receives the thrust pressure equipment of pressure equipment post to the assigned position, the location bolt breaks away from the oil filler point automatically at bush pressure equipment in-process, make the pressure equipment post need not stop or reset at pressure equipment in-process, the continuity of whole pressure equipment process has been improved.

The invention is further provided with: the positioning bolt is externally provided with a limiting convex part, and the limiting convex part is attached to the outer wall of the positioning hole, so that the pushing chute is positioned right above the pushing column.

Through adopting above-mentioned technical scheme, when stretching into the oil filler point along the locating hole top with the location bolt, spacing convex part and locating hole outer wall laminate mutually make to promote the chute and be located directly over promoting the post, avoid the location bolt to promote the unable entering of post and promote the chute when dropping along with the bush.

The invention is further provided with: the positioning end is in clearance fit with the inner wall of the bushing, the inner wall of the guide sleeve is in clearance fit with the outer wall of the bushing, and the pushing end is in clearance fit with the inner wall of the guide sleeve.

The invention has the beneficial effects that:

1. the guide sleeve with the positioning convex part is used for positioning and guiding the press fitting of the bush, so that the press fitting stability of the bush is improved, meanwhile, a positioning bolt is inserted into the guide sleeve to position the relative position of the oil injection hole and the main pin hole, the placing direction of the bush is detected, and the press fitting precision of the bush is improved;

2. the positioning hole is formed in the guide sleeve, the positioning bolt is taken out after falling for a certain distance in the positioning hole along with the bushing, and the bushing pressed into the main pin hole is axially positioned, so that the press-fitting precision is further improved;

3. the pushing column is arranged in the positioning hole, the pushing chute is arranged on the side wall of the positioning bolt, and the positioning bolt can push the positioning bolt to automatically separate from the oil filling hole through the pushing chute when the positioning bolt continues to move downwards after axial displacement l, so that the press-fitting column does not need to be stopped or reset in the press-fitting process, and the continuity of the whole press-fitting process is improved.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic press-fitting view of the upper bushing of example 1.

Fig. 2 is a schematic structural view of the guide bush in embodiment 1.

Fig. 3 is a schematic view of the connection relationship between the upper guide sleeve and the upper fork lug in embodiment 1.

Fig. 4 is a press-fitting schematic view of the lower bushing of embodiment 1.

FIG. 5 is a schematic view showing the structure of the lower guide bush of embodiment 1.

FIG. 6 is a schematic view showing the connection between the lower guide bush and the lower fork lug in embodiment 1.

FIG. 7 is a diagram showing the connection between the positioning holes and the positioning pins in accordance with example 2.

FIG. 8 is a schematic view showing the positional relationship of the positioning pin protruding into the oil hole according to embodiment 3.

FIG. 9 is a schematic view showing the positional relationship of the positioning pin of embodiment 3 pushed by the pushing cylinder to disengage from the oil hole.

FIG. 10 is a schematic view of a knuckle assembly construction.

In the figure, 1, a steering knuckle assembly; 11. a shaft end; 12. a frame end; 121. an upper fork ear; 122. a lower fork ear; 123. connecting holes; 13. a king pin hole; 14. an upper bushing; 15. a lower bushing; 16. an oil filler hole; 21. an upper guide sleeve; 211. a positioning projection; 212. a positioning column; 22. a lower guide sleeve; 3. pressing the columns; 31. a positioning end; 32. a pushing end; 4. positioning a bolt; 5. positioning holes; 6. pushing the column; 7. pushing the chute; 8. a limit convex part.

Detailed Description

The technical solution of the present invention will be clearly and completely described below with reference to specific embodiments. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without any inventive step, are within the scope of the present invention.

As shown in fig. 3 and 10, the knuckle assembly 1 includes a shaft end 11, a frame end 12 and a bushing, the frame end 12 is provided with an upper fork lug 121 and a lower fork lug 122, the upper fork lug 121 and the lower fork lug 122 are respectively provided with a main pin hole 13, the upper fork lug 121 is provided with four connecting holes 123, the bushing includes an upper bushing 14 and a lower bushing 15, the upper bushing 14 and the lower bushing are installed in the main pin hole 13 of the upper fork lug 121 in an interference fit manner, the lower bushing 15 and the upper bushing 14 are installed in the main pin hole 13 of the lower fork lug 122 in an interference fit manner, side walls of the upper bushing 14 and the lower bushing 15 are respectively provided with oil holes 16, and the oil holes 16 are through holes.

Embodiment 1, a process for press-fitting a knuckle bushing, as shown in fig. 1-3, includes a guide sleeve and a press-fitting post 3, the press-fitting post 3 includes a positioning end 31 extending into the bushing and a pushing end 32 extending into the guide sleeve and pushing the bushing into a main pin hole 13, the positioning end 31 is in clearance fit with an inner wall of the bushing, an inner wall of the guide sleeve is in clearance fit with an outer wall of the bushing, and the pushing end 32 is in clearance fit with an inner wall of the guide sleeve. The guide sleeve comprises an upper guide sleeve 21 and a lower guide sleeve 22, a positioning convex part 211 is arranged on the upper guide sleeve 21, a positioning column 212 is inserted into the positioning convex part 211 of the upper guide sleeve 21, and two positioning convex parts 211 are arranged at the bottom of the lower guide sleeve 22. The side walls of the guide sleeve 21 and the lower guide sleeve 22 are inserted with a positioning bolt 4, the upper guide sleeve 21 and the lower guide sleeve 22 are respectively provided with a positioning hole 5 for the positioning bolt 4 to extend into, and the positioning bolt 4 penetrates through the guide sleeve and extends into the oil filling hole 16 to enable one end of the guide sleeve, which is close to the fork lug, to be parallel and level with one end of the bushing, which is close to the fork lug.

The press mounting process comprises the following steps:

s1: clamping and fixing the steering knuckle, so that the upper fork lug 121 is positioned under the press-fitting column 3, the upper guide sleeve 21 is placed on the upper fork lug 121, the positioning convex part 211 on the upper guide sleeve 21 is attached to the outer side surface of the upper fork lug 121, the two positioning columns 212 are respectively inserted into the two mounting holes of the upper fork lug 121, so that the inner wall of the upper guide sleeve 21 is concentric with the main pin hole 13 of the upper fork lug 121, and the positioning bolt is positioned right above the oil filling hole arrangement position of the steering knuckle assembly;

s2: placing the upper bush 14 in the upper guide sleeve 21 so that the bottom surfaces of the upper bush 14 and the upper guide sleeve 21 are aligned with the end surfaces of the upper fork lugs 121, and rotating the upper bush 14 so that the oil injection hole 16 is aligned with the positioning hole 5 of the upper guide sleeve 21;

s3: the positioning bolt 4 is inserted into the oil filling hole 16 in a sliding mode, circumferential positioning and press-fitting direction detection are carried out on the oil filling hole 16, and if the positioning bolt 4 can be inserted into the oil filling hole 16 in a sliding mode, the placing direction of the upper bushing 14 is correct; if the positioning bolt 4 cannot extend into the oil filling hole 16, the positioning bolt indicates that the upper lining 14 is placed in the wrong direction, the upper lining 14 is taken out and placed in the upper guide sleeve 21 in the reverse direction, and the upper lining 14 is positioned again by extending the positioning bolt 4 into the oil filling hole 16 in a sliding mode;

s4: taking out the positioning bolt 4, enabling the press-fitting column 3 to fall down to enable the positioning end 31 to extend into the upper bushing 14, further enabling the pushing end 32 to push the upper bushing 14 to slide towards the main pin hole 13 of the upper fork lug 121, and enabling the upper bushing 14 to be pressed to a specified position;

s5: the press mounting column 3 is reset to be completely separated from the guide sleeve;

s6: as shown in fig. 4-6, the knuckle is rotated to enable the lower fork lug 122 of the knuckle to be arranged right below the press-fitting column 3, the lower guide sleeve 22 is placed on the lower fork lug 122, and the two positioning protrusions 211 on the lower guide sleeve 22 are attached to the side wall of the lower fork lug 122, so that the inner wall of the lower guide sleeve 22 is concentric with the main pin hole 13 on the lower fork lug 122, and meanwhile, the relative angle between the lower guide sleeve and the knuckle is arranged at a specified position for positioning;

placing the lower bush 15 in the lower guide sleeve 22 so that the bottom surface of the lower bush 15 and the bottom surface of the lower guide sleeve 22 are aligned with the end surfaces of the lower fork lugs 122, and rotating the lower bush 15 so that the oil injection hole 16 is aligned with the positioning hole 5 of the lower guide sleeve 22;

the positioning bolt 4 is slidably inserted into the oil filling hole 16, and if the positioning bolt 4 can be slidably inserted into the oil filling hole 16, the placement direction of the lower bushing 15 is correct; if the positioning bolt 4 cannot extend into the oil filling hole 16, the positioning bolt indicates that the lower bushing 15 is placed in the wrong direction, the lower bushing 15 is taken out and reversely placed in the lower guide sleeve 22, and the positioning bolt 4 extends into the oil filling hole 16 to position the lower bushing 15 again by sliding;

taking out the positioning bolt 4, enabling the press-fitting column 3 to fall down to enable the positioning end 31 to extend into the lower bushing 15, further enabling the pushing end 32 to push the lower bushing 15 to slide towards the main pin hole 13 of the lower fork lug 122, and enabling the lower bushing 15 to be pressed to a specified position;

the press mounting column 3 is reset to be completely separated from the guide sleeve.

Embodiment 2, as shown in fig. 7, the difference from embodiment 1 lies in that positioning holes 5 into which the positioning pins 4 extend and axially slide are respectively arranged on the upper guide sleeve 21 and the lower guide sleeve 22, the maximum distance for the positioning pins 4 to slide in the positioning holes 5 is L, when the positioning pins 4 are slid in step S3 and step 6, the positioning pins 4 slide along the tops of the positioning holes 5 and extend into the oil filling holes 16, and if the positioning pins 4 can slide along the tops of the positioning holes 5 and extend into the oil filling holes 16, the bushing placement direction is correct; if the positioning bolt 4 cannot extend into the oil filling hole 16, the lining placing direction is wrong, the lining is taken out and placed in the guide sleeve in the reverse direction, and the lining is positioned again by extending the positioning bolt 4 into the oil filling hole 16 in a sliding mode;

when step S4 is performed, the press-fitting column 3 falls down to make the positioning end 31 extend into the bushing to push the bushing and the positioning pin 4 to slide towards the direction close to the main pin hole 13, the sliding distance is L, wherein L is more than 0 and less than or equal to L, then the press-fitting column 3 stops or resets, the positioning pin 4 is taken out, and the press-fitting column 3 falls down again to push the bushing to slide towards the main pin hole 13 to a specified position.

Embodiment 3, as shown in fig. 8 and 9, is different from embodiment 2 in that two side walls of two positioning holes 5 are provided with pushing columns 6, a side wall of a positioning bolt 4 is provided with pushing chutes 7 into which the pushing columns 6 slide, and the positioning bolt 4 falls along with a bush and pushes the pushing columns 6 to apply pushing force to the pushing chutes 7 so as to make the positioning bolt 4 slide and separate from an oil filling hole 16. The outside of the positioning bolt 4 is provided with a limiting convex part 8, the limiting convex part 8 is attached to the outer wall of the positioning hole 5, so that the pushing chute 7 is positioned right above the pushing column 6, the pushing column continues to move downwards after the positioning bolt 4 moves axially l, the pushing column 6 extends into the driving chute and contacts with the top of the pushing chute 7, the pushing column 6 continues to move downwards along the positioning hole 5 under the thrust of the oil filling hole 16 along with the positioning bolt 4, the pushing column 6 pushes the positioning bolt 4 to slide towards the outer side of the guide sleeve until the end part of the positioning bolt 4 is completely separated from the oil filling hole 16, then the bush is pressed to a specified position under the thrust of the press-mounting column 3, the positioning bolt 4 is automatically separated from the oil filling hole 16 in the bush press-mounting process, the press-mounting column 3 does not need to stop or reset in the press-mounting process, and the continuity of the whole press-mounting process is improved.