Press fitting tool for elastic bushing of electric power steering gear for light truck

Abstract

The utility model discloses a press fitting tool for an elastic bushing of an electric power steering gear for a light truck. Comprising a positioning device for positioning a steering gear shell assembly, an upper pressing device for applying pressure in the first direction to the positioning device and ejecting an elastic bush into a containing hole of the steering gear shell assembly, and a lower pressing device for applying pressure in the first direction to the elastic bush located in the containing hole of the steering gear shell assembly. And the downward pressing device is arranged above the upward pressing device. The elastic bushing press-fitting tool for the electric power steering gear for the light truck is high in elastic bushing press-fitting efficiency, simple in structure and low in manufacturing cost.

Description

Technical Field

[0001] The utility model belongs to the technical field of vehicle steering system production equipment, and specifically relates to a press-fitting tool for an elastic bushing of an electric power steering device for a light truck. Background Art

[0002] There are many elastic bushings used in existing electric steering systems, especially in electric power steering devices for light trucks. In order to withstand large impact loads, vibration frequencies, etc., and at the same time transmit large load outputs, multiple elastic bushings are usually installed on the housing to increase the radial and axial stiffness of the elastic bushings to meet the use requirements of the electric power steering device.

[0003] The structure of the elastic bushing and the steering gear housing assembly is as follows Figure 2 , Figure 3 The steering gear housing assembly 4801 is provided with a first receiving hole 4802, a second receiving hole 4803 and a third receiving hole 4804 for assembling the elastic bushing.

[0004] The elastic bushing includes an inner bushing for the mounting hole and an elastic rubber material. The inner bushing 5004 (5104, 5204, 5304, 5404, 5504) is T-shaped and is a hollow shaft component of the same size. It is made of steel and has a certain strength. It is locked and connected to the frame mounting hole by bolts.

[0005] The elastic rubber material is NR rubber material, which is combined with the inner sleeve 5004 (5104, 5204, 5304, 5404, 5504) through the vulcanization process. It has certain hardness, radial static stiffness and tensile strength. The outer cylindrical elastic rubber material 5003 (5103, 5203, 5303, 5403, 5503) is interference fit with the first accommodating hole 4802, the first accommodating hole 4803, and the first accommodating hole 4804 on the steering gear housing assembly 4801, and the end face rubber materials 5002 (5102, 5202, 5302, 5402, 5502) at the large shaft diameters at both ends are fitted with the end faces of the first accommodating hole 4802, the first accommodating hole 4803, and the first accommodating hole 4804. There is elastic rubber material at the upper, lower, left and right directions of the mounting hole of the steering gear housing assembly 4801, which plays a role in resisting impact, vibration, fatigue, etc.

[0006] The structural design of the elastic bushing described above requires press-fitting in both the upper and lower directions of the steering gear housing assembly receiving hole. The existing elastic bushing press-fitting method can only press-fit one end before the other end, so a steering gear housing assembly needs to press-fit the elastic bushing six times to complete the assembly.

[0007] The above-mentioned problems of the elastic bushing press-fitting tooling for the electric power steering for light trucks are as follows:

[0008] 1. The pressing efficiency is very low.

[0009] 2. The number of pressing procedures, tooling, and personnel increases, resulting in high cost investment.

[0010] For example, the patent document with publication number CN201380381Y discloses a press-fit device for an elastic bushing, which includes a pressure head, a guide shaft, a bracket vertically below the guide shaft, an open cavity formed inside the bracket, a positioning mandrel arranged in the cavity, the positioning mandrel partially exposed from the bracket, a through hole arranged along the axial direction of the positioning mandrel, the through hole diameter is adapted to the guide shaft, and the bottom of the positioning mandrel is fixed to the bottom of the bracket by an elastic reset member. The technical solution disclosed in the patent document also cannot solve the technical problems described above. Utility Model Content

[0011] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model provides a press-fitting tool for an elastic bushing of an electric power steering device for a light truck, the purpose of which is to improve the press-fitting efficiency.

[0012] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is: an elastic bushing pressing tool for an electric power steering device for a light truck, comprising a positioning device for positioning a steering gear housing assembly, an upper pressing device for applying pressure along a first direction to the positioning device and pushing the elastic bushing into a receiving hole of the steering gear housing assembly, and a lower pressing device for applying pressure along the first direction to the elastic bushing located in the receiving hole of the steering gear housing assembly, wherein the lower pressing device is arranged above the upper pressing device; the lower pressing device comprises a lower pressing rod and a lower pressing adjusting rod connected to the lower pressing rod and used for contacting the elastic bushing, an extension rod inserted into the elastic bushing is arranged on the lower pressing adjusting rod, and a sealing ring for contacting the elastic bushing is arranged on the extension rod.

[0013] The positioning device includes a guide base plate, a locking mechanism for applying pressure to the steering gear housing assembly, a guide top sleeve aligned with the accommodating hole position on the steering gear housing assembly, and a first inner hole positioning mechanism and a second inner hole positioning mechanism for respectively positioning the steering gear housing assembly at both ends of the steering gear housing assembly. The locking mechanism, the guide top sleeve, the first inner hole positioning mechanism and the second inner hole positioning mechanism are arranged on the guide base plate, three accommodating holes are arranged on the steering gear housing assembly, and three guide top sleeves are arranged in total. The three guide top sleeves are respectively a first guide top sleeve, a second guide top sleeve and a third guide top sleeve.

[0014] The first inner hole positioning mechanism includes a power-assisting side positioning plate arranged on the guide base plate and a power-assisting side positioning shaft arranged on the power-assisting side positioning plate and used for inserting into the first inner hole of the steering gear housing assembly. The second inner hole positioning mechanism includes a steering side positioning plate arranged on the guide base plate and a steering side positioning shaft arranged on the steering side positioning plate and used for inserting into the second inner hole of the steering gear housing assembly. The power-assisting side positioning shaft and the steering side positioning shaft are parallel to the second direction, and the second direction is perpendicular to the first direction.

[0015] The locking mechanism includes a positioning block and a locking screw arranged on the guide base plate, a pressure plate rotatably connected to the positioning block, and a locking handle for fixing the pressure plate on the locking screw. A pad is arranged on the pressure plate for contacting the surface of the steering gear housing assembly.

[0016] The pressing device includes a lower pressing device that cooperates with the positioning device and is used to push the elastic bushing into the accommodating hole of the steering gear housing assembly, an upper pressing device connected to the positioning device, and a pressing head assembly that applies pressure along a first direction to the upper pressing device, and the pressing device is connected to the pressing head assembly and the upper pressing device.

[0017] The lower pressing device includes a press-fit base plate and a guide push rod arranged on the press-fit base plate and inserted into the guide push sleeve. A total of three guide push rods are arranged, and the three guide push rods are respectively a first guide push rod, a second guide push rod, and a third guide push rod. The first guide push rod is inserted into the first guide push sleeve, the second guide push rod is inserted into the second guide push sleeve, and the third guide push rod is inserted into the third guide push sleeve.

[0018] The upper pressing device includes a guide pressure plate and a positioning rod arranged on the guide pressure plate and connected to the guide base plate. The guide base plate is located below the guide pressure plate. The pressure head assembly includes a pressure head body and a pressing positioning plate connected to the pressure head body. The pressing positioning plate is located above the guide pressure plate.

[0019] The pressing rod is connected to the pressing positioning plate.

[0020] The utility model of the press-fitting tool for the elastic bushing of the electric power steering gear for light trucks has a simple structure, reduces costs, reduces waste of processes and personnel, and has a high press-fitting efficiency. It only needs to install the elastic bushings at the upper and lower ends of the steering gear housing assembly on the tooling, and the press-fitting process of six elastic bushings can be completed at one time, thereby improving the press-fitting work efficiency; and by arranging a sealing ring on the extension rod to contact the elastic bushing, a certain static friction force is generated between the two, which can prevent the elastic bushing from falling off, thereby improving the reliability of the press-fitting. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] This specification includes the following drawings, which show the following contents:

[0022] Figure 1 It is a structural schematic diagram of the press-fitting method of the elastic bushing of the electric power steering device for light trucks of the utility model;

[0023] Figure 2 It is a schematic diagram of the structure of the elastic bushing;

[0024] Figure 3 It is a schematic diagram of the structure of the steering gear housing assembly and the elastic bushing;

[0025] Figure 4 It is a structural schematic diagram of an elastic bushing press-fitting tool for an electric power steering device for a light truck of the utility model;

[0026] Figure 5 It is a structural schematic diagram of the elastic bushing pressing device;

[0027] Figure 6 It is a schematic diagram of the structure of the positioning device of the steering gear housing assembly;

[0028] Figure 7 It is a structural schematic diagram of the elastic bushing pressing device;

[0029] Figure 8 It is a cross-sectional view of the positioning shaft assembly on the power-assisting side;

[0030] Fig. 9 is a cross-sectional view of the steering side positioning shaft assembly;

[0031] Figure 10.1 is a schematic diagram of the structure of the first, second and third guide push rods;

[0032] Figure 10.2 is a cross-sectional view of the first, second and third guide push rods;

[0033] Figure 11.1 is a schematic diagram of the structure of the first, second and third push-down rods;

[0034] Figure 11.2 is a cross-sectional view of the first, second and third push-down rods;

[0035] Figure 12.1 is a schematic diagram of the structures of the first, second and third push-down adjustment rods;

[0036] Figure 12.2 is a front view of the first, second and third push-down adjustment levers;

[0037] Figure 12.3 is a top view of the first, second and third push-down adjustment rods;

[0038] Figure 13.1is a structural schematic diagram of the locking mechanism;

[0039] Figure 13.2 yes Figure 13.1 Middle NN section view;

[0040] Fig.14 This is a front view of a press-fitting tool for an elastic bushing of an electric power steering device for a light truck of the utility model;

[0041] Fig.15 yes Fig.14 The AA section view in the middle and the partial enlarged view of the elastic bushing installation state;

[0042] Fig.16 yes Fig.14 Middle BB section view;

[0043] Fig.17 yes Fig.14 The AA section view in the middle and the partial enlarged view of the elastic bushing press-fitting process 1;

[0044] Fig.18 yes Fig.14 The AA section view in the middle and the partial enlarged view of the elastic bushing press-fitting process 2;

[0045] Fig.19 yes Fig.14 The AA section view in the middle and the partial enlarged view of the elastic bushing press-fitting process three;

[0046] Fig. 20 yes Fig.14 The middle AA section view shows the elastic bushing press-fitting completed and the press head assembly returned to its original position;

[0047] The markings in the figure are:

[0048] 1. T-nut; 2. First hexagon socket bolt; 3. Elastic ring for shaft; 401. First guide push rod; 402. First annular groove; 5. Bottom plate positioning shaft; 601. Second guide push rod; 602. Second annular groove; 7. Bottom plate; 801. Third guide push rod; 802. Third annular groove; 9. Second hexagon socket bolt; 10. Third hexagon socket bolt; 11. Steering side positioning plate; 1201. Steering side positioning shaft; 1202. Waist-shaped groove; 13. Fourth hexagon socket bolt; 14. Fifth hexagon socket bolt; 15. Positioning block; 16. Pad; 17. Press plate; 18. Second guide top sleeve; 19. Auxiliary force side positioning shaft; 20, power side positioning plate; 21, handle sleeve; 22, third guide top sleeve; 23, locking handle; 24, locking screw; 25, first guide top sleeve; 26, guide bottom plate; 27, first positioning rod; 28, first sealing ring; 29, first downward pressure adjustment rod; 30, first adjusting nut; 3101, first downward pressure rod; 3201, second downward pressure rod; 33, pressure head body; 34, downward pressure positioning plate; 3501, third downward pressure rod; 36, third adjusting nut; 37, third downward pressure adjustment rod; 38, third O-ring; 39, second positioning rod; 40, third positioning rod; 41, guide pressure plate; 4 2. Fourth positioning rod; 43. Second adjusting nut; 44. Second downward adjusting rod; 45. Second sealing ring; 46. Oil-free bushing; 47. Servo press; 4801. Steering gear housing assembly; 4802. First accommodating hole; 4803. Second accommodating hole; 4804. Third accommodating hole; 49. Force sensor connector; 5001. First elastic bushing; 5002. First end face elastic rubber material; 5003. First outer circle elastic rubber material; 5004. First inner bushing; 5101. Second elastic bushing; 5102. Second end face elastic rubber material; 5103. Second outer circle elastic rubber material; 5104. Second inner bushing ; 5201, the third elastic bushing; 5202, the third end face elastic rubber material; 5203, the third outer circle elastic rubber material; 5204, the third inner bushing; 5301, the fourth elastic bushing; 5302, the fourth end face elastic rubber material; 5303, the fourth outer circle elastic rubber material; 5304, the fourth inner bushing; 5401, the fifth elastic bushing; 5402, the fifth end face elastic rubber material; 5403, the fifth outer circle elastic rubber material; 5404, the fifth inner bushing; 5501, the sixth elastic bushing; 5502, the sixth end face elastic rubber material; 5503, the sixth outer circle elastic rubber material; 5504, the sixth inner bushing; 56, the pressing tool. DETAILED DESCRIPTION

[0049] The specific implementation methods of the utility model are further explained in detail below with reference to the accompanying drawings through the description of embodiments, with the aim of helping technicians in the field to have a more complete, accurate and in-depth understanding of the concept and technical solution of the utility model and facilitating its implementation.

[0050] It should be noted that, in the following embodiments, the "first", "second", "third", "fourth", "fifth" and "sixth" do not represent an absolute distinction in structure and / or function, nor do they represent a sequence of execution, but are merely for the convenience of description.

[0051] like Figures 1 to 20 As shown, the utility model provides a press-fitting tool for an elastic bushing of an electric power steering device for a light truck, comprising a positioning device for positioning a steering gear housing assembly, an upper pressing device for applying pressure along a first direction to the positioning device and pushing the elastic bushing into a receiving hole of the steering gear housing assembly, and a lower pressing device for applying pressure along the first direction to the elastic bushing located in the receiving hole of the steering gear housing assembly, wherein the lower pressing device is arranged above the upper pressing device.

[0052] Specifically, if Figure 2 , Figure 3 As shown, the steering gear housing assembly 4801 is provided with a first accommodating hole 4802 , a second accommodating hole 4803 and a third accommodating hole 4804 for assembling the elastic bushing.

[0053] The elastic bushing includes an inner bushing for the mounting hole and an elastic rubber material. The inner bushing is T-shaped, is a hollow shaft-like component, is made of steel, has a certain strength, and is locked and connected to the frame mounting hole by bolts.

[0054] The elastic rubber is made of NR rubber and is combined with the inner bushing through a vulcanization process. It has certain hardness, radial static stiffness, tensile strength and other characteristics. The small shaft diameter of the elastic rubber is interference fit with the accommodation hole on the steering housing assembly 4801, and the end face rubber at the large shaft diameter at both ends fits with the end face of the inner hole. There is elastic rubber in the upper, lower, left and right directions of the mounting hole of the steering housing assembly 4801, which plays a role in resisting impact, vibration and fatigue.

[0055] like Figure 6 , Figure 8 , Fig. 9 , Figure 13.1 , Figure 13.2 , Fig.15 and Fig.16As shown, the positioning device includes a guide base plate 26, a locking mechanism for applying pressure to the steering gear housing assembly 4801, a guide top sleeve aligned with the accommodating hole position on the steering gear housing assembly 4801 and used to accommodate the elastic bushing, and a first inner hole positioning mechanism and a second inner hole positioning mechanism respectively used to position the steering gear housing assembly 4801 at both ends of the steering gear housing assembly 4801, the locking mechanism, the guide top sleeve, the first inner hole positioning mechanism and the second inner hole positioning mechanism are arranged on the guide base plate 26, the steering gear housing assembly 4801 is provided with three accommodating holes, and the guide top sleeves are provided with three in total, and the three guide top sleeves are respectively the first guide top sleeve 25, the second guide top sleeve 18, and the third guide top sleeve 22. The guide base plate 26 is arranged horizontally, and the locking mechanism, the three guide top sleeves, the first inner hole positioning mechanism and the second inner hole positioning mechanism are arranged on the top surface of the guide base plate 26, and the locking mechanism and the three guide top sleeves are located between the first inner hole positioning mechanism and the second inner hole positioning mechanism. The guide bottom plate 26 is rectangular and made of aluminum plate, in order to reduce the weight of the tooling and facilitate the handling of the tooling. The guide bottom plate 26 is provided with three through holes of the same size at the positions of the first guide top rod 401, the second guide top rod 601 and the third guide top rod 801 fixedly connected to the bottom plate 7, respectively. The three through holes are respectively interference fit with the lower ends of the first guide top sleeve 25, the second guide top sleeve 18 and the third guide top sleeve 22. The first guide top sleeve 25, the second guide top sleeve 18 and the third guide top sleeve 22 are vertically arranged on the guide bottom plate 26. A countersunk hole for assembling the first hexagon socket bolt 2, the second hexagon socket bolt 9 and the third hexagon socket bolt 10 is provided at each of the four corners of the lower end surface of the guide bottom plate 26.

[0056] like Figure 6 , Figure 8 , Fig. 9 , Fig.15 and Fig.16As shown, the first inner hole positioning mechanism includes a power-assist side positioning plate 20 arranged on the guide base plate 26 and a power-assist side positioning shaft 19 arranged on the power-assist side positioning plate 20 and used to be inserted into the first inner hole of the steering gear housing assembly 4801, and the second inner hole positioning mechanism includes a steering side positioning plate 11 arranged on the guide base plate 26 and a steering side positioning shaft 1201 arranged on the steering side positioning plate 11 and used to be inserted into the second inner hole of the steering gear housing assembly 4801, the power-assist side positioning shaft 19 and the steering side positioning shaft 1201 are parallel to the second direction, the second direction is perpendicular to the first direction, the second direction is the horizontal direction, and the first direction is the vertical direction. The power-assist side positioning plate 20 and the steering side positioning plate 11 are vertically arranged at both ends of the length direction of the guide base plate 26, the power-assist side positioning plate 20 is connected to the guide base plate 26 by two first inner hexagonal bolts 2, and two inner threaded holes for screwing and fixing the power-assist side positioning plate 20 with the two first inner hexagonal bolts 2 are arranged on the lower end surface of the power-assist side positioning plate 20. Two through holes are set at both ends of the lower part of the steering side positioning plate 11, and the other two second hexagon socket bolts 9 and the third hexagon socket bolts 10 are respectively passed through the two countersunk holes of the guide base plate 26, the through holes at both ends of the lower part of the steering side positioning plate 11 and the fourth positioning rod 42, and the internal threaded hole set at the lower end of the first positioning rod 27 are respectively screwed with the two second hexagon socket bolts 9 and the third hexagon socket bolts 10 to fix the steering side positioning plate 11 on the guide base plate 26.

[0057] like Figure 6 , Figure 8 , Fig.15 and Fig.16 As shown, the power-assisting side positioning plate 20 is approximately convex and made of steel. The lower end of the power-assisting side positioning plate 20 is provided with two internal threaded holes for screwing together with the first hexagon socket bolt 2 and the countersunk holes on the guide base plate 26 for positioning. The power-assisting side positioning plate 20 is provided with a first guide through hole for the power-assisting side positioning shaft 19 to pass through. The power-assisting side positioning plate 20 is provided with a second guide countersunk hole for guiding and positioning the power-assisting side positioning shaft 19 on the same axis as the first guide through hole. The end face of the second guide countersunk hole on the power-assisting side positioning plate 20 is fitted and limited with the end face of the hole on the left end of the steering gear housing assembly 4801. The power-assisting side positioning shaft 19 is a convex hollow shaft-like component made of steel and has a certain wear resistance. As shown Figure 8As shown, the power-assisting side positioning shaft 19 includes a large diameter section and a small diameter section connected to each other. The large diameter section and the small diameter section are coaxially arranged cylinders. The diameter of the large diameter section is larger than that of the small diameter section. The large diameter section of the power-assisting side positioning shaft 19 is used to locate the inner hole at the left end of the steering housing assembly 4801, and the diameter of the small diameter section has a small gap with the first guide through hole on the power-assisting side positioning plate 20. The center of the diameter of the small diameter section of the power-assisting side positioning shaft 19 is provided with an internal threaded hole for screwing with the first hexagon socket bolt 2, and the countersunk hole provided at the center of the diameter end face of the large diameter section at the end of the internal threaded hole is connected. An annular groove is provided at the diameter of the large diameter section of the power-assisting side positioning shaft 19 and the diameter of the small diameter section, which can avoid the step in the middle of the power-assisting side positioning plate 20 and also reduce the weight of the parts. The diameter of the small diameter section of the power-assisting side positioning shaft 19 and the diameter of the diameter section move left and right at the first guide through hole and the second guide countersunk hole on the power-assisting side positioning plate 20. The handle cover 21 is a hollow shaft-like component made of steel. A countersunk hole is set in the middle for the first hexagon socket bolt 2 to pass through. The first hexagon socket bolt 2 is screwed and fixed with the inner threaded hole in the middle of the power-assisting side positioning shaft 19. The outer cylindrical surface of the handle cover 21 is provided with a full circle of knurled surface for the operator to hold, which increases the surface friction and facilitates manual operation. The first guide hole is a round hole and the diameter of the first guide hole is the same as the outer diameter of the small diameter section of the power-assisting side positioning shaft 19. The two are matched with a small clearance to ensure accurate positioning. When positioning the steering gear housing assembly 4801, the person holds the outer cylindrical surface of the handle cover 21 and inserts the power-assisting side positioning shaft 19 to the right into the first inner hole of the steering gear housing assembly 4801, so that the power-assisting side positioning shaft 19 is limited on the power-assisting side positioning plate 20, ensuring that the power-assisting side positioning shaft 19 can accurately position the steering gear housing assembly 4801. After the power-assisting side positioning shaft 19 is pulled out to the left, the power-assisting side positioning shaft 19 can move axially to the left, and the power-assisting side positioning shaft 19 can be pulled out from the first inner hole of the steering gear housing assembly 4801 .

[0058] like Figure 6 , Fig. 9 , Fig.15 and Fig.16 As shown, the steering side positioning plate 11 is convex in shape and made of steel. The lower end of the steering side positioning plate 11 is provided with two through holes for respectively passing through the second hexagon socket bolt 9, the third hexagon socket bolt 10 and the positioning countersunk hole on the guide bottom plate 26. The steering side positioning plate 11 is provided with a second guide hole for the steering side positioning shaft 1201 to pass through. The first guide hole and the second guide hole are coaxially arranged. The steering side positioning shaft 1201 is a hollow stepped shaft component made of steel and has a certain wear resistance. Fig. 9As shown, the steering side positioning shaft 1201 includes a large diameter section and a small diameter section connected to each other. The large diameter section and the small diameter section are coaxially arranged cylinders. The diameter of the large diameter section is larger than the diameter of the small diameter section. The large diameter section of the steering side positioning shaft 1201 is used for the operator to hold. The outer circumferential surface of the large diameter section of the steering side positioning shaft 1201 is provided with a full circle of reticulated knurled surface to increase surface friction and facilitate manual operation. The second guide hole is a circular hole and the diameter of the second guide hole is the same as the outer diameter of the small diameter section of the steering side positioning shaft 1201. The two are matched with a small clearance to ensure accurate positioning. When positioning the steering gear housing assembly 4801, after the steering side positioning shaft 1201 is inserted into the second inner hole of the steering gear housing assembly 4801, the steering side positioning shaft 1201 is fixed to the steering side positioning plate 11 by the fourth hexagon socket bolt 13, and the fourth hexagon socket bolt 13 is threadedly connected to the steering side positioning plate 11, and a waist-shaped groove 1202 is provided on the outer circular surface of the small diameter section of the steering side positioning shaft 1201 for the axial diameter of the fourth hexagon socket bolt 13 to be embedded. The waist-shaped groove 1202 is penetrated by the hollow hole, and there is a gap of 0.5mm between the axial diameter of the fourth hexagon socket bolt 13, which facilitates the axial movement of the steering side positioning shaft 1201 within the range of the waist-shaped groove 1202, so that the steering side positioning shaft 1201 is inserted into the second inner hole of the steering gear housing assembly 4801 and the small axial diameter end face of the steering side positioning shaft 1201 is respectively fitted with the bottom surface of the center hole of the steering gear housing assembly 4801 and the end face of the first guide hole on the power-assisted side positioning plate 20 is respectively fitted with the end face of the hole of the steering gear housing assembly 4801, thereby ensuring that the steering side positioning shaft 1201 can accurately position the steering gear housing assembly 4801.

[0059] like Fig. 9 and Fig.16 As shown, when the steering gear housing assembly 4801 is positioned, during the process of the steering side positioning shaft 1201 being inserted into the second inner hole of the steering gear housing assembly 4801, the fourth hexagon socket bolt 13 on the steering side positioning plate 11 moves relative to the steering side positioning shaft 1201 along the waist-shaped groove 1202 of the steering side positioning shaft 1201, so that the small diameter end face of the steering side positioning shaft 1201 is fitted with the bottom surface of the center hole of the steering gear housing assembly 4801. At this time, the steering gear housing assembly 4801 is limited by the end face of the power-assisting side positioning plate 20, the power-assisting side positioning shaft 19 is centrally positioned with the steering side positioning shaft 1201, and the upper end faces of the orifices of the first guide top sleeve 25, the second guide top sleeve 18, and the third guide top sleeve 22 are fitted, so that the position of the steering gear housing assembly 4801 is quickly and accurately positioned before pressing.

[0060] like Figure 6 , Figure 13.1 , Figure 13.2 , Fig.15 and Fig.16As shown, in this embodiment, a locking mechanism is arranged on the guide base plate 26 of the press-fitting device, and the locking mechanism is on the same straight line parallel to the second direction. The locking mechanism includes a positioning block 15 and a locking screw 24 arranged on the guide base plate 26, a pressing plate 17 rotatably connected to the positioning block 15, and a locking handle 23 for fixing the pressing plate 17 on the locking screw 24. A pad 16 for contacting the surface of the steering gear housing assembly 4801 is arranged on the pressing plate 17. The pad 16 is made of nylon soft material to prevent the steel pressing plate 17 from directly contacting the steering gear housing assembly 4801 and causing damage to the steering gear housing assembly 4801. The positioning block 15 is a rectangular structure groove, made of steel, and has a certain strength. The positioning block 15 is fixedly mounted on the top surface of the guide base plate 26 by the first hexagon socket bolt 2. The pressing plate 17 is an arc-shaped convex component made of steel. One end of the pressing plate 17 is rotatably connected to the positioning block 15, and the rotation center line of the pressing plate 17 is parallel to the second direction. The other end of the pressing plate 17 is provided with a U-shaped groove for the locking screw 24 to pass through. The locking screw 24 is fixedly arranged on the top surface of the guide bottom plate 26. The locking screw 24 of the locking mechanism and the positioning block 15 are on the same straight line parallel to the third direction, and the third direction is a horizontal direction and is perpendicular to the second direction. The locking handle 23 is threadedly connected to the locking screw 24. The locking handle 23 is used to press and fix the pressing plate 17 on the locking screw 24 in the locking state, so that the pressing plate 17 can apply pressure to the steering gear housing assembly 4801 to keep the steering gear housing assembly 4801 fixed. When the steering gear housing assembly 4801 needs to be loosened, the locking handle 23 is first loosened and removed, and then the pressure plate 17 is rotated upward so that the pressure plate 17 no longer presses the steering gear housing assembly 4801, so that the steering gear housing assembly 4801 can be taken out.

[0061] like Figure 6 , Figure 13.1 and Figure 13.2 As shown, the pad 16 is in an arc shape, matching the shape of the contact part on the steering gear housing assembly 4801. The pad 16 is preferably made of nylon, which has a certain compressive strength and wear resistance, and protects the surface of the press-fit steering gear housing assembly 4801 from being crushed. The pad 16 is glued to the pressing plate 17 at the middle of the two ends of the pressing plate 17. The inner arc size of the pad 16 is 0.3mm larger than the shaft diameter of the steering gear housing assembly 4801, so that the press-fit surface fits better.

[0062] like Figure 6 , Figure 13.1 and Figure 13.2As shown, in this embodiment, a locking mechanism is arranged on the guide base plate 26 of the press-fitting device, and the locking mechanism is on the same straight line parallel to the second direction. The locking screw of one of the locking mechanisms is a locking screw 24, which is a stepped shaft component and is made of steel. The lower end of the locking screw 24 is provided with an external thread that is screwed with the internal thread hole on the guide base plate 26. The locking handle matched with the locking screw 24 is a locking handle 23, and the upper end of the locking screw 24 is provided with an external thread hole for screwing with the locking handle 23. An opposite side notch for tightening with an open-end wrench is arranged at the upper end of the middle shaft diameter of the locking screw 24. The locking handle 23 is a cylindrical component and is made of steel. The middle part of the locking handle 23 is provided with an internal thread hole for screwing with the external thread at the upper end of the locking screw 24. The outer circumferential surface of the locking handle 23 is provided with a full circle of mesh knurling surface to increase the surface friction and facilitate manual operation. A countersunk hole and a corresponding internal threaded hole are provided on the guide base plate 26 for conveniently fixing the steering gear housing assembly 4801. The countersunk hole is positioned and tightened by assembling the first hexagon socket bolt 2 and the second internal threaded hole on the positioning block 15, and the internal threaded hole and the external threads at the upper and lower ends of the locking screw 24 are positioned and tightened respectively.

[0063] like Figure 6 , Fig.15 and Fig.16As shown, the first guide top sleeve 25, the second guide top sleeve 18, and the third guide top sleeve 22 are all the same hollow stepped shaft components with the same size, and the first guide top sleeve 25, the second guide top sleeve 18, and the third guide top sleeve 22 are made of steel. The first guide top sleeve 25, the second guide top sleeve 18, the third guide top sleeve 22, and the countersunk holes with an outer diameter of 0.2 mm clearance fit are arranged at the end face elastic rubber material 5002 (5102, 5202, 5302, 5402, 5502) for accommodating the elastic bushing in the direction of the central axis line of the upper large end shaft diameter. The depth of the countersunk holes is greater than the length of the elastic bushing, so that the assembly of the elastic bushing is more convenient and the positioning is more accurate. The shaft diameter of the lower small end is interference fit with the corresponding through hole size on the guide base plate 26. Two oil-free shaft sleeves 46 are pressed into the inner holes of the first guide top sleeve 25, the second guide top sleeve 18, and the third guide top sleeve 22. The inner holes of the oil-free shaft sleeves 46 pressed into the inner holes of the first guide top sleeve 25, the second guide top sleeve 18, and the third guide top sleeve 22 are respectively clearance fit with the shaft diameters on the first guide top rod 401, the second guide top rod 601, and the third guide top rod 801. The first guide top sleeve 25, the second guide top sleeve 18 and the third guide top sleeve 22 are cylinders, and the first guide top sleeve 25, the second guide top sleeve 18 and the third guide top sleeve 22 are vertically arranged on the guide base plate 26. The first guide top sleeve 25 and the third guide top sleeve 22 are on the same straight line parallel to the second direction, and the second guide top sleeve 18 is on another straight line parallel to the second direction. The two locking mechanisms are located in the middle position between the first guide top sleeve 25 and the second guide top sleeve 18.

[0064] like Figure 5 , Fig.15 and Fig.16As shown, the press-fitting device includes a lower pressing device that cooperates with the positioning device and is used to push the elastic bushing into the receiving hole of the steering gear housing assembly 4801, an upper pressing device connected to the positioning device, and a pressing head assembly that applies pressure along the first direction to the upper pressing device, and the pressing device is connected to the pressing head assembly and the upper pressing device. The lower pressing device includes a bottom plate 7 and a guide push rod disposed on the bottom plate 7 and inserted into the guide push sleeve. There are three guide push rods in total, and the three guide push rods are respectively a first guide push rod 401, a second guide push rod 601 and a third guide push rod 801. The first guide push rod 401 is inserted into the first guide push sleeve 25, the second guide push rod 601 is inserted into the second guide push sleeve 18, and the third guide push rod 801 is inserted into the third guide push sleeve 22. The bottom plate 7 is horizontally arranged, the bottom plate 7 is located below the guide bottom plate 26 and the bottom plate 7 is parallel to the guide bottom plate 26, the first guide top rod 401, the second guide top rod 601 and the third guide top rod 801 are vertically arranged on the bottom plate 7, the first guide top rod 401 and the first guide top sleeve 25 are coaxially arranged, the second guide top rod 601 and the second guide top sleeve 18 are coaxially arranged, and the third guide top rod 801 and the third guide top sleeve 22 are coaxially arranged.

[0065] The bottom plate 7 is rectangular and made of aluminum plate. Its purpose is to reduce the weight of the tooling and facilitate the handling of the tooling. A through hole is set at the center of the bottom plate 7, which is interference fit with the outer diameter of the small end of the base positioning shaft 5, so that the bottom plate 7 and the base positioning shaft 5 are fastened together. The large shaft diameter of the lower end of the base positioning shaft 5 and the central through hole of the base of the T-slot servo press 47 are matched with a small clearance, so that the tooling is accurately positioned, ensuring that the center of the tooling during positioning is on the same axis as the central through hole of the base of the T-slot servo press 47 and the force sensor connector 49 on the servo press 47, so as to achieve the function of rapid mold change and positioning the center of the tooling. A U-shaped groove of the same size is set at the left and right ends of the bottom plate 7, so as to facilitate the fastening of the bottom plate 7 to the base of the T-slot servo press 47 through the T-nut 1 and the first hexagon socket bolt 2. At the joint end surface of the base plate 7 and the base of the T-slot servo press 47, four countersunk holes for assembling the first hexagon socket bolts 2 are arranged with the same size as the four mounting holes on the steering gear housing assembly 4801, and the other end of the hole is arranged with a countersunk hole with a smaller clearance matching the outer circle of the first guide push rod 401, the second guide push rod 601, and the third guide push rod 801, so as to ensure that the three guide push rods and the three mounting holes on the steering gear housing assembly 4801 correspond to each axis respectively, and are positioned in the countersunk holes corresponding to the base plate 7 by screwing the first hexagon socket bolt 2 into the internal threaded holes on the three guide push rods.

[0066] The base positioning shaft 5 is a hollow stepped shaft component made of steel and has a certain wear resistance. The large shaft diameter at the lower end of the base positioning shaft 5 and the central through hole of the base of the T-slot servo press 47 are matched with a small clearance, which ensures accurate tool positioning and facilitates tool replacement. The small shaft diameter at the upper end of the base positioning shaft 5 and the central through hole of the bottom plate 7 are interference fit, so that the bottom plate 7 and the base positioning shaft 5 are fastened together. The large shaft diameter at the lower end of the base positioning shaft 5 and the central through hole of the base of the T-slot servo press 47 are matched with a small clearance, so that the tool positioning is accurate, and the center of the tool positioning is on the same axis as the central through hole of the base of the T-slot servo press 47 and the force sensor connector 49 on the servo press 47, realizing the function of rapid changeover and positioning of the tool center.

[0067] The outer dimensions of the T-slot nut 1 match the clearance of the T-slot on the base of the T-slot servo press 47 , and an internal threaded hole is provided in the middle, which is screwed together with the first hexagon socket bolt 2 to lock the base plate 7 .

[0068] The first guide push rod 401, the second guide push rod 601 and the third guide push rod 801 are all cylindrical parts with the same size. The first guide push rod 401, the second guide push rod 601 and the third guide push rod 801 are made of steel and can withstand large tensile pressure. The first guide push rod 401, the second guide push rod 601 and the third guide push rod 801 are installed on the bottom plate 7 through the first hexagon socket bolt 2. The middle part of the lower end surface of the first guide push rod 401, the second guide push rod 601 and the third guide push rod 801 is provided with an internal threaded hole screwed with the first hexagon socket bolt 2. The shaft diameter of the first guide push rod 401, the second guide push rod 601 and the third guide push rod 801 is matched with the inner hole clearance of the countersunk hole at the upper end surface of the bottom plate 7 and the oil-free shaft sleeve 46. The bottom end surface of the countersunk hole is limited and locked in the countersunk hole at the upper end surface of the bottom plate 7 by the first hexagon socket bolt 2.

[0069] like Figure 5 , Figure 10.1 , Figure 10.2 , Fig.15 and Fig.16As shown, a first annular groove 402, a second annular groove 602, and a third annular groove 802 for assembling a shaft elastic circlip 3 are arranged at the position of the upper end axial diameter of the first guide push rod 401, the second guide push rod 601, and the third guide push rod 801. A shaft elastic circlip 3 is arranged in the first annular groove 402 on the first guide push rod 401, and the shaft elastic circlip 3 is located above the oil-free shaft sleeve 46 arranged in the first guide top sleeve 25. The outer diameter of the shaft elastic circlip 3 is greater than the inner hole diameter of the oil-free shaft sleeve 46. The shaft elastic circlip 3 can be used to achieve the function of axial limiting when the first guide top sleeve 25 moves upward. A shaft circlip 3 is arranged in the second annular groove 602 on the second guide push rod 601. The shaft circlip 3 is located above the oil-free sleeve 46 arranged in the second guide top sleeve 18. The outer diameter of the shaft circlip 3 is larger than the inner hole diameter of the oil-free sleeve 46. The shaft circlip 3 can be used to achieve axial limiting when the second guide top sleeve 18 moves upward. A shaft circlip 3 is arranged in the third annular groove 802 on the third guide push rod 801. The shaft circlip 3 is located above the oil-free sleeve 46 arranged in the third guide top sleeve 22. The outer diameter of the shaft circlip 3 is larger than the inner hole diameter of the oil-free sleeve 46. The shaft circlip 3 can be used to achieve axial limiting when the third guide top sleeve 22 moves upward.

[0070] like Figure 7 , Fig.15 and Fig.16As shown, the upper pressing device includes a guide plate 41 and a positioning rod disposed on the guide plate 41 and connected to the guide bottom plate 26, and the guide bottom plate 26 is located below the guide plate 41. The guide plate 41 is horizontally arranged, and the guide plate 41 is located above the guide bottom plate 26, and the guide plate 41 is parallel to the guide bottom plate 26. The outer dimensions of the guide plate 41 are consistent with those of the guide bottom plate 26, and are rectangular in shape and made of aluminum plate. The purpose is to reduce the weight of the tooling and facilitate the handling of the tooling. There are four positioning rods, which are the first positioning rod 27, the second positioning rod 39, the third positioning rod 40 and the fourth positioning rod 42. The first positioning rod 27 and the fourth positioning rod 42 are both the same shaft-like components with the same size, and the second positioning rod 39 and the third positioning rod 40 are both the same shaft-like components with the same size. The first positioning rod 27 and the fourth positioning rod 42 are 15 mm shorter than the second positioning rod 39 and the third positioning rod 40. The first positioning rod 27, the second positioning rod 39, the third positioning rod 40 and the fourth positioning rod 42 are all made of steel. The lower ends of the first positioning rod 27, the fourth positioning rod 42, the second positioning rod 39 and the third positioning rod 40 are fixedly connected to the steering side positioning plate 11 and the first hexagon socket bolt 2 and the guide bottom plate 26 through the second hexagon socket bolt 9 and the third hexagon socket bolt 10, and the lower end faces of the first positioning rod 27, the second positioning rod 39, the third positioning rod 40 and the fourth positioning rod 42 are provided with internal thread holes screwed with the second hexagon socket bolt 9, the third hexagon socket bolt 10 and the first hexagon socket bolt 2 in the direction of the central axis. The upper ends of the first positioning rod 27, the second positioning rod 39, the third positioning rod 40 and the fourth positioning rod 42 are fixedly connected to the guide pressure plate 41 through the first hexagon socket bolt 2, and the upper end faces of the first positioning rod 27, the second positioning rod 39, the third positioning rod 40 and the fourth positioning rod 42 are provided with internal thread holes screwed with the first hexagon socket bolt 2 in the direction of the central axis.

[0071] like Figure 7 , Fig.15 and Fig.16As shown, the pressure head assembly includes a pressure head body 33 and a downward pressure positioning plate 34 connected to the pressure head body 33. The downward pressure positioning plate 34 is located above the guide pressure plate 41. The downward pressure positioning plate 34 is horizontally arranged and parallel to the guide pressure plate 41. A through hole is arranged at the center of the guide pressure plate 41. The diameter of the through hole is larger than the outer diameter of the pressure head body 33. The through hole has a large clearance fit with the large end shaft diameter of the pressure head body 33 to prevent interference between the guide pressure plate 41 and the large end of the pressure head body 33 during the press-fitting process, and also facilitate the assembly and disassembly of the pressure head body 33 and the force sensor connector 49. The four corners of the upper end surface of the guide pressure plate 41 are respectively arranged on the same axis as the countersunk holes at the four corners on the guide bottom plate 26, and the countersunk holes for assembling the first hexagon socket bolt 2. It is connected together by the first positioning rod 27, the second positioning rod 39, the third positioning rod 40, the fourth positioning rod 42, the first hexagon socket bolt 2 and the countersunk hole on the guide base plate 26 on the positioning device.

[0072] like Figure 7 , Fig.15 and Fig.16 As shown, the downward pressing positioning plate 34 is triangular in shape and made of steel plate. There are irregular through grooves on both sides inside, the purpose of which is to reduce the weight of the tooling and facilitate the handling of the tooling. A through hole is set in the middle of the downward pressing positioning plate 34 for matching with the larger clearance of the small shaft diameter at the upper end of the pressure head body 33. The pressure head body 33 is a stepped shaft component made of steel. The upper end of the pressure head body 33 is fixedly connected to the force sensor connector 49 of the servo press 47. A rectangular ring groove is set on the upper part of the small shaft diameter at the upper end of the pressure head body 33, which is installed in the inner hole of the force sensor connector 49, and the first hexagon socket bolt 2 is locked in the rectangular ring groove on the small shaft diameter of the pressure head body 33 for positioning. When applying pressure, the force sensor connector 49 of the servo press 47 can push the pressure head body 33 and the downward pressing positioning plate 34 to move downward. When returning to the position, the force sensor connector 49 of the servo press 47 can pull the pressure head body 33 and the downward pressing positioning plate 34 to move upward.

[0073] like Figure 7 , Fig.15 and Fig.16As shown, the pressing device includes a pressing rod connected to the pressing positioning plate 34 and a pressing adjusting rod connected to the pressing rod and used to contact the elastic bushing. An extension rod inserted into the elastic bushing is provided on the pressing adjusting rod, and a sealing ring used to contact the elastic bushing is provided on the extension rod. The extension rod is a cylinder, and the extension rod and the pressing adjusting rod are coaxially fixedly connected. The extension rod extends toward the bottom of the pressing adjusting rod, and the diameter of the extension rod is smaller than the diameter of the pressing adjusting rod. The sealing ring is an O-ring, and the sealing ring is made of rubber. A circular groove for accommodating the sealing ring is provided on the outer circumference of the extension rod. After the extension rod is inserted into the center hole of the elastic bushing, the sealing ring is located in the center hole of the elastic bushing, and the outer circumference of the sealing ring contacts the inner circumference of the elastic bushing, and a certain static friction force is generated between the two, which can prevent the elastic bushing from falling.

[0074] There are three lower pressure rods in total, which are the first lower pressure rod 3101, the second lower pressure rod 3201 and the third lower pressure rod 3501. The first lower pressure rod 3101, the second lower pressure rod 3201 and the third lower pressure rod 3501 are vertically arranged, and the upper end surfaces of the first lower pressure rod 3101, the second lower pressure rod 3201 and the third lower pressure rod 3501 are provided with internal threaded holes screwed with the first hexagon socket bolt 2 in the direction of the central axis line, the first hexagon socket bolt 2 passes through the three through holes on the lower pressure positioning plate 34 and is fixedly connected with the internal threaded holes on the upper ends of the three lower pressure rods, the first lower pressure rod 3101 and the first guide top sleeve 25 are coaxially arranged, the second lower pressure rod 3201 and the second guide top sleeve 18 are coaxially arranged, and the third lower pressure rod 3501 and the third guide top sleeve 22 are coaxially arranged. There are also three downward pressure adjustment rods, which are the first downward pressure adjustment rod 29, the second downward pressure adjustment rod 44 and the third downward pressure adjustment rod 37. The first downward pressure adjustment rod 29 is connected to the lower end of the first downward pressure rod 3101 and the two are coaxially arranged. The second downward pressure adjustment rod 44 is connected to the lower end of the second downward pressure rod 3201 and the two are coaxially arranged. The third downward pressure adjustment rod 37 is connected to the lower end of the third downward pressure rod 3501 and the two are coaxially arranged. The guide pressure plate 41 is provided with three through holes, and two oil-free sleeves 46 are installed in each through hole. The first downward pressure rod 3101, the second downward pressure rod 3201 and the third downward pressure rod 3501 pass through the inner holes of the oil-free sleeves 46 arranged in the three through holes respectively, and the inner holes of each oil-free sleeve 46 are respectively matched with the shaft diameter clearances on the first downward pressure rod 3101, the second downward pressure rod 3201 and the third downward pressure rod 3501.

[0075] like Figure 7 , Figure 11.1 , Figure 11.2 , Fig.15 and Fig.16As shown, the first pressing rod 3101, the second pressing rod 3201 and the third pressing rod 3501 are all the same shaft-like parts with the same size, and the first pressing rod 3101, the second pressing rod 3201 and the third pressing rod 3501 are made of steel. The lower end centers of the first pressing rod 3101, the second pressing rod 3201 and the third pressing rod 3501 are provided with internal thread holes that are screwed with the external threads on the first pressing adjustment rod 29, the second pressing adjustment rod 44 and the third pressing adjustment rod 37. The fourth annular groove 3102, the fifth annular groove 3202 and the sixth annular groove 3502 for assembling the shaft elastic retaining ring 3 are provided at the positions of the axial diameters of the internal thread holes at the lower ends of the first pressing rod 3101, the second pressing rod 3201 and the third pressing rod 3501. A shaft circlip 3 is disposed in the fourth annular groove 3102 on the first lower pressure rod 3101, and the shaft circlip 3 is located below the oil-free sleeve 46 disposed in the guide pressure plate 41, and the outer diameter of the shaft circlip 3 is greater than the inner diameter of the oil-free sleeve 46. A shaft circlip 3 is disposed in the fifth annular groove 3202 on the second lower pressure rod 3201, and the shaft circlip 3 is located below the oil-free sleeve 46 disposed in the guide pressure plate 41, and the outer diameter of the shaft circlip 3 is greater than the inner diameter of the oil-free sleeve 46. A shaft circlip 3 is disposed in the sixth annular groove 3502 on the third lower pressure rod 3501, and the shaft circlip 3 is located below the oil-free sleeve 46 disposed in the guide pressure plate 41, and the outer diameter of the shaft circlip 3 is greater than the inner diameter of the oil-free sleeve 46. The shaft elastic retaining rings 3 arranged in the fourth annular groove 3102, the fifth annular groove 3202 and the sixth annular groove 3502 on the first downward pressure rod 3101, the second downward pressure rod 3201 and the third downward pressure rod 3501 can be used to limit the upper downward pressure device in the vertical direction. During the upward movement of the downward pressure device, when the shaft elastic retaining rings 3 arranged on the first downward pressure rod 3101, the second downward pressure rod 3201 and the third downward pressure rod 3501 contact the oil-free shaft sleeve 46 arranged in the upper guide pressure plate 41, the upper downward pressure device can be pulled to move upward synchronously. In the initial state, the pressure head assembly remains stationary, and the shaft elastic retaining rings 3 arranged in the fourth annular groove 3102, the fifth annular groove 3202, and the sixth annular groove 3502 on the first lower pressure rod 3101, the second lower pressure rod 3201, and the third lower pressure rod 3501 are in contact with the oil-free sleeve 46 arranged in the upper guide pressure plate 41, so that the upper lower pressure device remains stationary. At the same time, the upper lower pressure device is connected to the positioning device, and the positioning device also remains stationary.

[0076] like Figure 3 , Figure 7 , Figures 12.1 to 12.3 , Fig.15 and Fig.16As shown, the first downward pressure adjusting rod 29, the second downward pressure adjusting rod 44 and the third downward pressure adjusting rod 37 are all the same shaft-like parts with the same size, and the first downward pressure adjusting rod 29, the second downward pressure adjusting rod 44 and the third downward pressure adjusting rod 37 are all made of steel. An extension rod is arranged at the lower end of the first downward pressure adjusting rod 29, the second downward pressure adjusting rod 44 and the third downward pressure adjusting rod 37, and the first sealing ring 28, the second sealing ring 45 and the third sealing ring 38 are respectively inserted into the extension rods of the first downward pressure adjusting rod 29, the second downward pressure adjusting rod 44 and the third downward pressure adjusting rod 37, and the first sealing ring 28, the second sealing ring 45 and the third sealing ring 38 are O-rings. The axial diameters of the lower ends of the first pressure adjusting rod 29, the second pressure adjusting rod 44 and the third pressure adjusting rod 37 and the first sealing ring 28, the second sealing ring 45 and the third sealing ring 38 in the groove have a small interference fit so that the fourth elastic bushing 5301, the fifth elastic bushing 5401 and the sixth elastic bushing 5501 are respectively fixed on the extension rods at the lower ends of the first pressure adjusting rod 29, the second pressure adjusting rod 44 and the third pressure adjusting rod 37, so that the elastic bushings are not easy to fall off, and the lower end faces of the first pressure adjusting rod 29, the second pressure adjusting rod 44 and the third pressure adjusting rod 37 are respectively in contact with the top surfaces of the fourth elastic bushing 5301, the fifth elastic bushing 5401 and the sixth elastic bushing 5501, thereby playing a limiting role.

[0077] The upper ends of the first pressure adjustment rod 29, the second pressure adjustment rod 44 and the third pressure adjustment rod 37 are provided with external threads that are screwed with the first pressure adjustment rod 3101, the second pressure adjustment rod 3201, the third pressure adjustment rod 3501 and the first adjustment nut 30, the second adjustment nut 43 and the third adjustment nut 36. A notch on the opposite side for tightening with an open-end wrench is provided on the shaft diameter of the external threads of the first pressure adjustment rod 29, the second pressure adjustment rod 44 and the third pressure adjustment rod 37. The first adjustment nut 30, the second adjustment nut 43 and the third adjustment nut 36 are all hexagonal parts of the same size and made of steel. An internal threaded hole for screwing with the external thread on the pressure adjustment rod is provided in the middle. The first adjustment nut 30, the second adjustment nut 43 and the third adjustment nut 36 are used to adjust the end face distance of the fourth elastic bushing 5301, the fifth elastic bushing 5401 and the sixth elastic bushing 5501 respectively to lock the first pressure adjustment rod 29, the second pressure adjustment rod 44 and the third pressure adjustment rod 37.

[0078] like Figure 2 , Figure 3 , Figure 7 , Fig.15 and Fig.16As shown, the first downward pressure adjusting rod 29 is threadedly connected to the first downward pressure rod 3101, and a first adjusting nut 30 is arranged on the first downward pressure adjusting rod 29. The first adjusting nut 30 is used to tightly fix the first downward pressure adjusting rod 29 to the first downward pressure rod 3101. The large end surface of the lower end of the first downward pressure adjusting rod 29 is used to contact the upper end surface of the fourth inner sleeve 5304 of the fourth elastic sleeve. Due to the threaded connection, the distance between the large end surface of the lower end of the first downward pressure adjusting rod 29 and the downward pressure positioning plate 34 can be adjusted, and then the distance that the fourth elastic sleeve is pushed downward in the first accommodating hole 4802 can be adjusted to achieve the purpose of controlling the pressing amount of the fourth elastic sleeve.

[0079] like Figure 2 , Figure 3 , Figure 7 , Fig.15 and Fig.16 As shown, the second downward pressure adjusting rod 44 is threadedly connected to the second downward pressure rod 3201, and a second adjusting nut 43 is provided on the second downward pressure adjusting rod 44, and the second adjusting nut 43 is used to tightly fix the second downward pressure adjusting rod 44 to the second downward pressure rod 3201. The large end surface of the lower end of the second downward pressure adjusting rod 44 is used to contact the upper end surface of the fifth inner bushing 5404 of the fifth elastic bushing. Due to the threaded connection, the distance between the large end surface of the lower end of the second downward pressure adjusting rod 44 and the downward pressure positioning plate 34 can be adjusted, and then the distance of pushing the fifth elastic bushing downward in the second accommodating hole 4803 can be adjusted to achieve the purpose of controlling the pressing amount of the fifth elastic bushing.

[0080] like Figure 2 , Figure 3 , Figure 7 , Fig.15 and Fig.16 As shown, the third downward pressure adjusting rod 37 is threadedly connected to the third downward pressure rod 3501, and a third adjusting nut 36 is provided on the third downward pressure adjusting rod 37. The third adjusting nut 36 is used to tightly fix the third downward pressure adjusting rod 37 to the third downward pressure rod 3501. The lower large end surface of the third downward pressure adjusting rod 37 is used to contact the upper end surface of the sixth inner bushing 5504 of the sixth elastic bushing. Due to the threaded connection, the distance between the lower large end surface of the third downward pressure adjusting rod 37 and the downward pressure positioning plate 34 can be adjusted, and then the distance of pushing the sixth elastic bushing downward in the third accommodating hole 4804 can be adjusted to achieve the purpose of controlling the pressing amount of the fourth elastic bushing.

[0081] The utility model also provides a method for pressing an elastic bushing of an electric power steering device for a light truck, which adopts the above-mentioned structure of the elastic bushing pressing tool for the electric power steering device for a light truck, and comprises the following steps:

[0082] S1. Apply lubricating medium to the three receiving holes and six elastic bushings of the steering gear housing assembly;

[0083] S2. First, install the small ends of the three elastic bushings upward into the guide top sleeve holes of the upper pressure device at the bottom;

[0084] S3, then install the three elastic bushings with their large ends facing upward on the downward pressure adjusting rods of the upper downward pressure device;

[0085] S4. Install the steering gear housing assembly on the positioning device;

[0086] S5, the pressure head assembly presses down, and the pressure head assembly applies pressure along the first direction to the upper pressing device, pressing the elastic bushing into the receiving hole of the steering gear housing assembly, and at the same time, the lower pressing device pushes the elastic bushing into the receiving hole of the steering gear housing assembly, so that the elastic bushings at the upper and lower ends of the steering gear housing assembly are pressed into place;

[0087] S6. After the pressure head assembly returns to its original position, remove the steering gear housing assembly 4801 with the pressed elastic bushing.

[0088] like Figure 3 As shown, the steering housing assembly 4801 is provided with three receiving holes, namely the first receiving hole 4802, the second receiving hole 4803 and the third receiving hole 4804. A first elastic bushing 5001 and a fourth elastic bushing 5301 are respectively installed at both ends of the first receiving hole 4802. A second elastic bushing 5101 and a fifth elastic bushing 5401 are respectively installed at both ends of the second receiving hole 4803. A third elastic bushing 5201 and a sixth elastic bushing 5501 are respectively installed at both ends of the third receiving hole 4804. The axes of the first receiving hole 4802, the second receiving hole 4803 and the third receiving hole 4804 are parallel, and the first receiving hole 4802 and the third receiving hole 4804 are arranged in the same plane of the axis. The second receiving hole 4803 is arranged parallel to the axes of the first receiving hole 4802 and the third receiving hole 4804 and in front of the axis of the steering housing assembly 4801.

[0089] In the above step S1, if Figure 2As shown, a lubricating medium is applied on the surfaces of the first outer cylindrical elastic rubber material 5003, the second outer cylindrical elastic rubber material 5103, the third outer cylindrical elastic rubber material 5203, the fourth outer cylindrical elastic rubber material 5303, the fifth outer cylindrical elastic rubber material 5403 and the sixth outer cylindrical elastic rubber material 5503 of the first elastic bushing 5001, the second elastic bushing 5101, the third elastic bushing 5201, the fourth elastic bushing 5301, the fifth elastic bushing 5401 and the sixth elastic bushing 5501, and a lubricating medium is applied on the inner cylindrical surface and the end surfaces at both ends of the hole opening of the first accommodating hole 4802, the second accommodating hole 4803 and the third accommodating hole 4804, and the lubricating medium is lithium-based grease.

[0090] In the above step S2, if Fig.15 As shown, the small ends of the first elastic bushing 5001, the second elastic bushing 5101 and the third elastic bushing 5201 coated with lubricating medium are placed upward into the inner holes of the first guide top sleeve 25, the second guide top sleeve 18 and the third guide top sleeve 22 for positioning, and the lower end surfaces of the first elastic bushing 5001, the second elastic bushing 5101 and the third elastic bushing 5201 are respectively fitted and limited with the upper end surfaces of the first guide top rod 401, the second guide top rod 601 and the third guide top rod 801.

[0091] In the above step S3, if Fig.15 As shown, the fourth elastic bushing 5301, the fifth elastic bushing 5401, and the sixth elastic bushing 5501 coated with lubricating medium are inserted into the first downward pressure adjusting rod 29, the second downward pressure adjusting rod 44, and the third downward pressure adjusting rod 37 respectively at their large ends with their large ends facing upward, and the lower end axial diameters of the fourth elastic bushing 5301, the fifth elastic bushing 5401, and the sixth elastic bushing 5501 are fixed to the first downward pressure adjusting rod 29, the second downward pressure adjusting rod 44, and the third downward pressure adjusting rod 37 respectively through a small interference fit with the first sealing ring 28, the second sealing ring 45, and the third sealing ring 38 in the groove.

[0092] In the above step S4, if Fig.15 , Fig.16As shown, take the steering gear housing assembly 4801, and place the steering gear housing assembly 4801 between the power-assisting side positioning plate 20 and the steering side positioning plate 11, the end face of the inner hole of the steering gear housing assembly 4801 on the steering gear housing assembly 4801 is fitted and limited with the right end face of the power-assisting side positioning plate 20, and the lower end faces of the openings of the first accommodating hole 4802, the second accommodating hole 4803, and the third accommodating hole 4804 on the steering gear housing assembly 4801 are respectively fitted and placed with the upper end faces of the openings of the first guide top sleeve 25, the second guide top sleeve 18, and the third guide top sleeve 22, and the handle sleeve 21 is pushed to move the power-assisting side positioning shaft 19, so that the power-assisting side positioning shaft 19 is inserted into the first inner hole on the steering gear housing assembly 4801 (the first inner hole is the steering gear housing assembly 4801 center hole), the large shaft diameter of the power-assisting side positioning shaft 19 is positioned with the center hole of the steering gear housing assembly 4801, and the steering side positioning shaft 1201 is pushed to move, so that the steering side positioning shaft 1201 is inserted into the second inner hole on the steering gear housing assembly 4801 (the second inner hole is the center hole of the steering gear housing assembly 4801), and the small shaft diameter end face of the steering side positioning shaft 1201 is fitted with the bottom surface of the center hole of the steering gear housing assembly 4801. At this time, the steering gear housing assembly 4801 is limited by the end face of the power-assisting side positioning plate 20, and the power-assisting side positioning shaft 19 is centrally positioned with the steering side positioning shaft 1201, and the upper end faces of the openings of the first guide top sleeve 25, the second guide top sleeve 18, and the third guide top sleeve 22 are fitted to position the steering gear housing assembly before pressing. Then rotate the pressure plate 17 so that the pad 16 on the pressure plate 17 is pressed on the steering gear housing assembly 4801, and then use the locking handle 23 to lock the pressure plate 17 on the locking screw 24 to complete the positioning and pressing fixation of the steering gear housing assembly 4801. At this time, the first accommodating hole 4802 of the steering gear housing assembly 4801 is located above the first guide top sleeve 25 and the two are coaxial, the second accommodating hole 4803 of the steering gear housing assembly 4801 is located above the second guide top sleeve 18 and the two are coaxial, and the third accommodating hole 4804 of the steering gear housing assembly 4801 is located above the third guide top sleeve 22 and the two are coaxial.

[0093] In the above step S5, if Fig.17 As shown, the start switch of the servo press 47 is turned, and the force sensor connector 49 on the servo press 47 pushes the pressure head body 33, the downward pressing positioning plate 34 and the downward pressing device to move downward synchronously, and the upper downward pressing device, the positioning device and the steering gear housing assembly 4801 also move downward synchronously until the steering gear housing assembly 4801 contacts the first elastic bushing 5001, the second elastic bushing 5101 and the third elastic bushing 5201 below. The contact of the three elastic bushings can provide a certain support for the steering gear housing assembly 4801, so that the upper downward pressing device, the positioning device and the steering gear housing assembly 4801 stop descending. Fig.18As shown, as the pressure head assembly continues to move downward, the pressing positioning plate 34 moves downward until the fourth elastic bushing 5301, the fifth elastic bushing 5401, and the sixth elastic bushing 5501 on the first pressing adjustment rod 29, the second pressing adjustment rod 44, and the third pressing adjustment rod 37 contact the first receiving hole 4802, the second receiving hole 4803, and the third receiving hole 4804 on the steering gear housing assembly 4801, respectively. Fig.19 As shown, as the pressure head assembly continues to move downward, the pressure head assembly applies pressure to the positioning device along the first direction, and the first direction is the vertical downward direction. The pressure head assembly pushes the upper pressing device and the positioning device to continue to move downward, and the positioning device drives the steering gear housing assembly 4801 to move downward synchronously. In the process of the steering gear housing assembly 4801 moving downward, the first guide push rod 401 pushes the first elastic bushing 5001 located in the first guide top sleeve 25 into the first accommodating hole 4802, the second guide push rod 601 pushes the second elastic bushing 5101 located in the second guide top sleeve 18 into the second accommodating hole 4803, and the third guide push rod 801 pushes the third elastic bushing 5201 located in the third guide top sleeve 22 into the third accommodating hole 4804, at the same time, the fourth elastic bushing 5301, the fifth elastic bushing 5401, and the sixth elastic bushing 5501 on the first downward adjustment rod 29, the second downward adjustment rod 44, and the third downward adjustment rod 37 are respectively pressed into the first accommodating hole 4802, the second accommodating hole 4803, and the third accommodating hole 4804 on the steering gear housing assembly 4801, until the end surface elastic rubber materials 5002 (5102, 5202, 5302, 5402, 5502) of the six elastic bushings are respectively fitted with the end surfaces of the first accommodating hole 4802, the second accommodating hole 4803, and the third accommodating hole 4804, until the six elastic bushings move the set distance and are pressed into place. At this time, the process of pressing the six elastic bushings simultaneously has been completed.

[0094] In the above step S6, if Fig. 20 As shown, after the six elastic bushings are synchronously pressed into place, the inner bushings on the six elastic bushings move down until the distance between their upper and lower end faces is consistent with the end faces on both sides of the shell opening, and the servo press 47 automatically returns to the zero position. After the pressure head assembly returns to its position, the operator first unscrews the locking handle 23 by hand, opens the pressure plate 17 pressed on the steering gear housing assembly 4801, and then releases the power-assisted side positioning shaft 19 and the steering side positioning shaft 1201 with both hands at the same time, and removes the steering gear housing assembly 4801 with the pressed elastic bushings. At this time, the whole process of pressing the steering gear elastic bushings has been completed.

[0095] The utility model solves the shortcomings of the existing press-fitting tooling for the electric power steering gear for light trucks. In comparison, it has the following advantages: simple structure, reduced cost, reduced waste of process and personnel, and high press-fitting efficiency. It is only necessary to install the elastic bushings at the upper and lower ends of the steering gear housing assembly on the tooling, and the press-fitting process of six elastic bushings can be completed at one time, thereby improving the press-fitting work efficiency.

[0096] The above is an exemplary description of the utility model in conjunction with the accompanying drawings. Obviously, the specific implementation of the utility model is not limited to the above-mentioned method. As long as various non-substantial improvements are made using the method concept and technical solution of the utility model; or the above concept and technical solution of the utility model are directly applied to other occasions without improvement, they are all within the protection scope of the utility model.

Claims

1. Press-fitting tool for elastic bushing of electric power steering for light trucks, characterized in that: It includes a positioning device for positioning a steering gear housing assembly, an upper pressing device for applying pressure along a first direction to the positioning device and pushing an elastic bushing into a receiving hole of the steering gear housing assembly, and a lower pressing device for applying pressure along the first direction to the elastic bushing located in the receiving hole of the steering gear housing assembly, wherein the lower pressing device is arranged above the upper pressing device; the lower pressing device includes a lower pressing rod and a lower pressing adjusting rod connected to the lower pressing rod and used for contacting the elastic bushing, an extension rod inserted into the elastic bushing is arranged on the lower pressing adjusting rod, and a sealing ring for contacting the elastic bushing is arranged on the extension rod.

2. The press-fitting tool for the elastic bushing of the electric power steering device for light trucks according to claim 1 is characterized in that: The positioning device includes a guide base plate, a locking mechanism for applying pressure to the steering gear housing assembly, a guide top sleeve aligned with the accommodating hole position on the steering gear housing assembly, and a first inner hole positioning mechanism and a second inner hole positioning mechanism for respectively positioning the steering gear housing assembly at both ends of the steering gear housing assembly. The locking mechanism, the guide top sleeve, the first inner hole positioning mechanism and the second inner hole positioning mechanism are arranged on the guide base plate, three accommodating holes are arranged on the steering gear housing assembly, and three guide top sleeves are arranged in total. The three guide top sleeves are respectively a first guide top sleeve, a second guide top sleeve and a third guide top sleeve.

3. The press-fitting tool for the elastic bushing of the electric power steering device for light trucks according to claim 2 is characterized in that: The first inner hole positioning mechanism includes a power-assisting side positioning plate arranged on the guide base plate and a power-assisting side positioning shaft arranged on the power-assisting side positioning plate and used for inserting into the first inner hole of the steering gear housing assembly. The second inner hole positioning mechanism includes a steering side positioning plate arranged on the guide base plate and a steering side positioning shaft arranged on the steering side positioning plate and used for inserting into the second inner hole of the steering gear housing assembly. The power-assisting side positioning shaft and the steering side positioning shaft are parallel to the second direction, and the second direction is perpendicular to the first direction.

4. The press-fitting tool for the elastic bushing of the electric power steering device for light trucks according to claim 2 is characterized in that: The locking mechanism includes a positioning block and a locking screw arranged on the guide base plate, a pressure plate rotatably connected to the positioning block, and a locking handle for fixing the pressure plate on the locking screw. A pad is arranged on the pressure plate for contacting the surface of the steering gear housing assembly.

5. The press-fitting tool for the elastic bushing of the electric power steering device for light trucks according to any one of claims 2 to 4, characterized in that: The upper pressing device includes a lower upper pressing device that cooperates with the positioning device and is used to push the elastic bushing into the accommodating hole of the steering gear housing assembly, an upper lower pressing device connected to the positioning device, and a pressure head assembly that applies pressure along a first direction to the upper lower pressing device, and the lower pressing device is connected to the pressure head assembly and the upper lower pressing device.

6. The press-fitting tool for the elastic bushing of the electric power steering device for light trucks according to claim 5 is characterized in that: The lower pressing device includes a press-fit base plate and a guide push rod arranged on the press-fit base plate and inserted into the guide push sleeve. A total of three guide push rods are arranged, and the three guide push rods are respectively a first guide push rod, a second guide push rod, and a third guide push rod. The first guide push rod is inserted into the first guide push sleeve, the second guide push rod is inserted into the second guide push sleeve, and the third guide push rod is inserted into the third guide push sleeve.

7. The press-fitting tool for the elastic bushing of the electric power steering device for light trucks according to claim 6 is characterized in that: The upper pressing device includes a guide pressure plate and a positioning rod arranged on the guide pressure plate and connected to the guide base plate. The guide base plate is located below the guide pressure plate. The pressure head assembly includes a pressure head body and a pressing positioning plate connected to the pressure head body. The pressing positioning plate is located above the guide pressure plate.

8. The press-fitting tool for the elastic bushing of the electric power steering device for light trucks according to claim 7 is characterized in that: The pressing rod is connected to the pressing positioning plate.

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