Bearing orifice spin riveting tool for electric power steering gear shell

Abstract

The utility model discloses a bearing orifice spin riveting tool for an electric power steering gear shell, which comprises a base, a rotatable spin riveting head, a positioning piece which is arranged on the base and is used for pressing the steering gear shell and positioning a shell bearing, and a spin riveting sleeve which is arranged on the spin riveting head and is used for spin riveting a bearing orifice on the steering gear shell, and a plurality of spin riveting sleeves are arranged. According to the bearing orifice spin riveting tool for the electric power steering gear shell, the spin riveting efficiency of the bearing orifice for the electric power steering gear shell can be improved, connection between the shell bearing and the steering gear shell can be firmer and more reliable, and the part design and cost input for axial limiting of the bearing are reduced through the spin riveting tool.

Description

Technical Field

[0001] The utility model belongs to the technical field of vehicle steering systems. Specifically, the utility model relates to a bearing hole orifice riveting tool for an electric power steering gear housing. Background Art

[0002] There is a current bearing fixing structure for an electric power steering gear housing. A bearing is press-fitted into the inner hole of the housing, and the depth of the inner hole of the housing is 2 mm greater than the thickness dimension of the bearing. In order to prevent the bearing from axially moving and falling off in the housing, it is necessary to perform rotary riveting on the upper end of the housing orifice, so that the housing orifice deforms, and the deformed part of the orifice just presses on the end face of the outer ring of the bearing to form a wrapping structure, making the connection between the bearing and the housing more firm and reliable. The prior art lacks a tool that can meet this processing requirement.

[0003] Chinese Patent with application number 202221329030.3 discloses a snap riveting tool, specifically an electric steering gear housing snap riveting tool. The snap riveting tool consists of a base, a riveting head, and a positioning pin. One end of the base is inserted with a connecting rod, and the other end of the base is sleeved with a riveting head. The end face of the riveting head is evenly distributed with riveting knives in a circular ring shape; a positioning pin is arranged on the base inside the riveting head. This snap riveting tool has a simple structure and is easy to use. The tool can be connected to a pneumatic impact hammer through the connecting rod, and positioning can be performed through the positioning pin, enabling the riveting knives to quickly and accurately align with the connecting thread, so that the pneumatic impact hammer can quickly break the thread through this tool. Since both ends of the tool are positioned during the process of impact-breaking the thread, there is no need to hold the tool, so that the hand is not in the impact direction, ensuring that the hand will not be impacted, effectively improving safety, and solving the problem of low safety of the existing hammering method and easy occurrence of safety accidents. It is particularly suitable for use in snap riveting of electric steering gear housings.

[0004] Therefore, it is desired to provide a bearing hole orifice rotary riveting tool for an electric power steering gear housing, especially a tool that can achieve high efficiency in rotary riveting the bearing hole orifice of the electric power steering gear housing and has an axial disengagement force between the bearing and the housing greater than 15 KN. Summary of the Utility Model

[0005] The utility model aims to solve at least one of the technical problems existing in the prior art. For this purpose, the utility model provides a bearing hole orifice rotary riveting tool for an electric power steering gear housing, aiming to improve the efficiency of rotary riveting the bearing hole orifice of the electric power steering gear housing.

[0006] To achieve the above object, the technical solution adopted by the utility model is: a bearing hole orifice rotary riveting tool for an electric power steering gear housing, including a base, a rotatable riveting head, a positioning member arranged on the base and used for pressing and positioning the steering gear housing and the housing bearing, and a riveting sleeve arranged on the riveting head and used for rotary riveting the bearing hole orifice on the steering gear housing. Multiple riveting sleeves are provided.

[0007] The riveting sleeve is installed on the riveting head through a positioning component, and all the riveting sleeves are evenly distributed circumferentially.

[0008] The positioning component includes a positioning shaft connected to the riveting head and a bearing sleeved on the positioning shaft, and the bearing is located between the positioning shaft and the riveting sleeve.

[0009] The positioning shaft is fixedly installed on the riveting head through a locking bolt.

[0010] A total of three riveting sleeves are provided.

[0011] The positioning member includes a pressing part and a positioning part. The pressing part is configured to apply pressure to the housing bearing and the steering gear housing, and the positioning part is configured to be embedded in the central hole of the housing bearing.

[0012] The positioning member further includes a screw rod, which is connected to the pressing part and the positioning part. The pressing part is located above the positioning part, and the diameter of the pressing part is larger than that of the positioning part.

[0013] The positioning member further includes a screwing part, which is connected to the pressing part and is located above the pressing part.

[0014] The screwing part is a regular hexagon.

[0015] The bearing orifice riveting tooling for the electric power steering gear housing of the present utility model can improve the riveting efficiency of the bearing orifice of the electric power steering gear housing. The axial disengagement force between the housing bearing and the steering gear housing can meet the requirement of being greater than 15 kN, and can make the connection between the housing bearing and the steering gear housing firmer and more reliable. Through the riveting tooling, the part design and cost investment for axial limit of the bearing are reduced. Description of the Drawings

[0016] This specification includes the following drawings, and the shown contents are respectively:

[0017] Figure 1 is a schematic structural diagram of the bearing orifice riveting tooling for the electric power steering gear housing;

[0018] Figure 2 is an exploded view of the parts of the bearing orifice riveting tooling for the electric power steering gear housing;

[0019] Figure 3 is the front view of the bearing orifice riveting tooling for the electric power steering gear housing;

[0020] Figure 4 is Figure 3 the A-A cross-sectional view in

[0021] Figure 5a isFigure 4 Partial enlarged view of the orifice of the middle housing bearing before spin riveting;

[0022] Figure 5b is Figure 4 Partial enlarged view of the orifice of the middle housing bearing after spin riveting;

[0023] Figure 6 is Figure 4 Sectional view B - B of the middle part;

[0024] Figure 7 is Figure 4 Sectional view of the spin riveting head of B - B in the middle part;

[0025] Figure 8 Schematic structural diagram of the positioning part;

[0026] Markings in the figure are: 1, base; 201, first bolt; 202, second bolt; 301, steering gear housing; 302, housing bearing; 4, positioning part; 401, screw rod; 402, pressing part; 403, positioning part; 404, screwing part; 501, first spin riveting sleeve; 502, second spin riveting sleeve; 503, third spin riveting sleeve; 601, first bearing; 602, second bearing; 603, third bearing; 701, first positioning shaft; 702, second positioning shaft; 703, third positioning shaft; 801, first locking bolt; 802, second locking bolt; 803, third locking bolt; 901, spin riveting head; 902, first plane; 903, first positioning hole; 904, first threaded hole; 905, second plane; 906, second positioning hole; 907, second threaded hole; 908, third plane; 909, third positioning hole; 910, third threaded hole. Specific embodiments

[0027] The following is a more detailed description of the specific embodiments of the present utility model with reference to the accompanying drawings through the description of the embodiments, aiming to help those skilled in the art have a more complete, accurate and in - depth understanding of the concept and technical solution of the present utility model and facilitate its implementation.

[0028] It should be noted that in the following embodiments, the "first", "second" and "third" do not represent an absolute distinction relationship in terms of structure and / or function, nor do they represent the execution order sequence, but are only for the convenience of description.

[0029] Such as Figures 1 to 8As shown in the figure, the utility model provides a riveting tool for the bearing hole of an electric power steering gear housing, which includes a base 1, a rotatable riveting head 901, a positioning member 4 arranged on the base 1 and used for pressing and positioning the steering gear housing 301 and the housing bearing 302, and a riveting sleeve arranged on the riveting head 901 and used for riveting the bearing hole of the steering gear housing 301. A plurality of riveting sleeves are provided.

[0030] The riveting sleeves are installed on the riveting head 901 through a positioning component, and all the riveting sleeves are evenly distributed along the circumference.

[0031] The positioning component includes a positioning shaft connected to the riveting head 901 and a bearing sleeved on the positioning shaft. The bearing is located between the positioning shaft and the riveting sleeve.

[0032] The positioning shaft is fixedly installed on the riveting head 901 through a locking bolt.

[0033] A total of three riveting sleeves are provided, and the riveting sleeves are rotatably arranged on the riveting head 901.

[0034] The positioning member 4 includes a pressing part 402 and a positioning part 403. The pressing part 402 is configured to apply pressure to the housing bearing 302 and the steering gear housing 301, and the positioning part 403 is configured to be embedded in the central hole of the housing bearing 302.

[0035] The positioning member 4 further includes a screw rod 401. The screw rod 401 is connected to the pressing part 402 and the positioning part 403. The pressing part 402 is located above the positioning part 403, and the diameter of the pressing part 402 is larger than that of the positioning part 403.

[0036] The positioning member 4 further includes a screwing part 404. The screwing part 404 is connected to the pressing part 402. The screwing part 404 is located above the pressing part 402, and the screwing part 404 is a regular hexagon.

[0037] Specifically, as Figures 1 to 7As shown, in this embodiment, the three riveting sleeves are respectively the first riveting sleeve 501, the second riveting sleeve 502, and the third riveting sleeve 503. The first riveting sleeve 501, the second riveting sleeve 502, and the third riveting sleeve 503 are rotatably arranged. The three positioning components are respectively the first positioning component, the second positioning component, and the third positioning component. The first positioning component includes a first positioning shaft 701 connected to the riveting head 901 and a first bearing 601 sleeved on the first positioning shaft 701. The first bearing 601 is located between the first positioning shaft 701 and the first riveting sleeve 501. The second positioning component includes a second positioning shaft 702 connected to the riveting head 901 and a second bearing 602 sleeved on the second positioning shaft 702. The second bearing 602 is located between the second positioning shaft 702 and the second riveting sleeve 502. The third positioning component includes a third positioning shaft 703 connected to the riveting head 901 and a third bearing 603 sleeved on the third positioning shaft 703. The third bearing 603 is located between the third positioning shaft 703 and the third riveting sleeve 503. The first bearing 601 is arranged inside the first riveting sleeve 501. The first positioning shaft 701 is used to position the first riveting sleeve 501 and the first bearing 601. The first positioning shaft 701 is positioned and fastened through assembling the first locking bolt 801 with the first positioning hole and the first threaded hole on the riveting head 901. The second bearing 602 is arranged inside the second riveting sleeve 502. The second positioning shaft 702 is used to position the second riveting sleeve 502 and the second bearing 602. The second positioning shaft 702 is positioned and fastened through assembling the second locking bolt 802 with the second positioning hole and the second threaded hole on the riveting head 901. The third bearing 603 is arranged inside the third riveting sleeve 503. The third positioning shaft 703 is used to position the third riveting sleeve 503 and the third bearing 603. The third positioning shaft 703 is positioned and fastened through assembling the third locking bolt 803 with the third positioning hole and the third threaded hole on the riveting head 901.

[0038] As Figure 2 , Figure 4 and Figure 6 shown, the first riveting sleeve 501, the second riveting sleeve 502, and the third riveting sleeve 503 are all the same hollow stepped shaft components with the same size. The large end shaft diameter center axis directions of the first riveting sleeve 501, the second riveting sleeve 502, and the third riveting sleeve 503 are respectively provided with counterbores for accommodating the outer diameters of the first bearing 601, the second bearing 602, and the third bearing 603 with interference fit. The depth of the counterbore is consistent with the thickness dimensions of the first bearing 601, the second bearing 602, and the third bearing 603. The first riveting sleeve 501, the second riveting sleeve 502, and the third riveting sleeve 503 can freely rotate around the inner rings of the assembled first bearing 601, the second bearing 602, and the third bearing 603.

[0039] As Figure 2 , Figure 4 and Figure 6As shown, the first positioning shaft 701, the second positioning shaft 702, and the third positioning shaft 703 are all the same hollow stepped shaft components with the same dimensions. The large ends of the first positioning shaft 701, the second positioning shaft 702, and the third positioning shaft 703 are respectively provided with counterbores for fastening and assembling the first locking bolt 801, the second locking bolt 802, and the third locking bolt 803. On the large end face shaft diameter, there are shoulders for limiting, which are larger than the inner ring shaft diameters of the first bearing 601, the second bearing 602, and the third bearing 603. The small end shaft diameter and the inner ring shaft diameters of the first bearing 601, the second bearing 602, and the third bearing 603 are in interference fit to prevent axial movement. The first locking bolt 801, the second locking bolt 802, and the third locking bolt 803 are all hexagon socket head cap screws with the same specifications.

[0040] As Figure 2 , Figure 4 , Figure 6 and Figure 7 shown, the first bearing 601, the second bearing 602, and the third bearing 603 are all deep groove ball bearings, mainly composed of an outer ring, an inner ring, balls, and a cage. After the components are assembled, there is a certain clearance. While the outer ring and the inner ring can rotate freely, they can withstand a large combined radial and axial load to generate an inward pressing riveting force at the orifice of the housing bearing 302.

[0041] As Figure 2 , Figure 4 and Figure 6 shown, the riveting head 901 is a shaft component. The upper end of the riveting head 901 is provided with a shaft diameter for connecting with the positioning hole of the axis of the equipment rotating spindle. The large end shaft diameter end face is limited with the end face of the equipment rotating spindle. There is a conical surface at the lower part of the large end shaft diameter of the riveting head 901. Below the conical surface, there are small shaft diameters for respectively positioning the first positioning shaft 701, the second positioning shaft 702, and the third positioning shaft 703. On the radial direction of the small shaft diameters, there are evenly distributed the first plane, the second plane, and the third plane as installation surfaces. Respectively perpendicular to the first plane, the second plane, and the third plane and passing through the axis of the riveting head 901, there are provided the first positioning hole 903, the second positioning hole 906, and the third positioning hole 909 for positioning the first positioning shaft 701, the second positioning shaft 702, and the third positioning shaft 703. The first positioning hole 903, the second positioning hole 906, and the third positioning hole 909 have the same size aperture, and are in transition fit with the small shaft diameters of the first positioning shaft 701, the second positioning shaft 702, and the third positioning shaft 703 respectively. On the coaxial line of the first positioning hole 903, the second positioning hole 906, and the third positioning hole 909, there are provided the first threaded hole 904, the second threaded hole 907, and the third threaded hole 910 for screwing and fastening with the first locking bolt 801, the second locking bolt 802, and the third locking bolt 803.

[0042] As Figure 2 and Figure 4As shown, the base 1 is a stepped shaft component. The upper end of the base 1 is provided with a small shaft diameter that has a clearance fit with the inner hole of the housing bearing 302 and is used for positioning. The lower end face of the small shaft diameter is used to limit the lower end face of the steering gear housing 301. The upper end face is provided with a counterbore for accommodating the positioning member 4 in the axial direction. A threaded hole for screwing with the positioning member 4 is provided at the lower end of the counterbore. The housing bearing 302 and the steering gear housing 301 are fastened to the upper end of the base 1 by locking the positioning member 4. The lower end of the base 1 is provided with a stepped shaft diameter in the same axis direction as the upper small shaft diameter for positioning with the equipment. Two counterbore holes for the first bolt 201 and the second bolt 202, which are evenly distributed on both sides and used for assembling on the equipment, are provided on the lower large end shaft diameter. Both the first bolt 201 and the second bolt 202 are hexagon socket head cap screws with the same specifications.

[0043] As Figure 2 , Figure 4 and Figure 8 shown, the positioning member 4 is located below the riveting head 901. The positioning member 4 includes a screw rod 401, a screwing part 404, a pressing part 402, and a positioning part 403. The screw rod 401 is coaxially and fixedly connected to the pressing part 402 and the positioning part 403. The screw rod 401 is threadedly connected to the base 1. The pressing part 402 and the positioning part 403 are circular. The pressing part 402 is located above the positioning part 403. The diameter of the pressing part 402 is larger than that of the positioning part 403. The pressing part 402 and the positioning part 403 are fixedly connected. The pressing part 402 is arranged to apply pressure to the housing bearing 302 and the steering gear housing 301. The positioning part 403 is arranged to be embedded in the central hole of the housing bearing 302. The positioning part 403 has a clearance fit with the central hole of the housing bearing 302. The pressing part 402 is located above the housing bearing 302 and contacts the inner ring end face of the housing bearing 302. The screwing part 404 is fixedly connected to the pressing part 402. The screwing part 404 is located above the pressing part 402. The screwing part 404 is a regular hexagon and is used in cooperation with a wrench. By screwing the positioning member 4 with a wrench, after tightening the positioning member 4, the positioning member 4 presses the housing bearing 302 and the steering gear housing 301 downward.

[0044] For the bearing hole mouth riveting tooling for the electric power steering gear housing with the above structure, the specific operation steps are as follows (as Figures 2 to 6 shown):

[0045] 1. Take the assembled component of the steering gear housing 301 and the housing bearing 302 that are press-fitted, and position it on the base 1 as Figure 4 shown.

[0046] 2. Take the positioning member 4 to press the assembled component of the steering gear housing 301 and the housing bearing 302.

[0047] 3. Press the start switch on the spin riveting equipment. The rotating main shaft of the equipment drives the spin riveting head 901, the first spin riveting sleeve 501, the second spin riveting sleeve 502, and the third spin riveting sleeve 503 to rotate synchronously and move downward. After moving down to the point where the first spin riveting sleeve 501, the second spin riveting sleeve 502, and the third spin riveting sleeve 503 before spin riveting as shown in Figure 4 , Figure 5a come into contact with the bearing hole openings of the steering gear housing 301 simultaneously, under the rotational action of the spin riveting head 901, the first spin riveting sleeve 501, the second spin riveting sleeve 502, and the third spin riveting sleeve 503 and the outer rings of the first bearing 601, the second bearing 602, and the third bearing 603 roll and rotate around the first positioning shaft 701, the second positioning shaft 702, and the third positioning shaft 703 respectively at the bearing hole openings of the steering gear housing 301. At this time, a spin riveting force that squeezes inward is generated at the bearing hole openings of the steering gear housing 301 until the first spin riveting sleeve 501, the second spin riveting sleeve 502, and the third spin riveting sleeve 503 continue to roll and rotate downward and move to the position where the deformed part of the bearing hole opening of the steering gear housing 301 after spin riveting as shown in Figure 5b just squeezes against the outer ring end face of the housing bearing 302 to form a wrapping structure, then the rotating main shaft of the equipment drives the spin riveting head 901, the first spin riveting sleeve 501, the second spin riveting sleeve 502, and the third spin riveting sleeve 503 to move upward and reset.

[0048] 4. Loosen and remove the positioning part 4.

[0049] 5. Remove the spin riveted steering gear housing and housing bearing assembly. At this time, the whole process of spin riveting the bearing hole opening of the housing is completed.

[0050] After verification, the spin riveting tooling for the bearing hole opening of the electric power steering gear housing with the above structure can make the axial disengagement force between the assembled housing bearing and the steering gear housing meet the requirement of being greater than 15 KN. The test data of the bearing disengagement force after spin riveting the bearing hole opening of the housing is shown in Table 1.

[0051] Table 1 Test data table of bearing disengagement force after spin riveting the bearing hole opening of the housing

[0052]

[0053] The above has made an exemplary description of the present invention in conjunction with the accompanying drawings. Obviously, the specific implementation of the present invention is not limited by the above methods. As long as various non-substantive improvements are made by adopting the method concept and technical solution of the present invention; or without improvement, the above concept and technical solution of the present invention are directly applied to other occasions, they are all within the protection scope of the present invention.

Claims

1. Bearing hole riveting tool for electric power steering housing, characterized by: It comprises a base, a rotatable riveting head, a positioning piece arranged on the base and used for pressing the steering gear housing and the housing bearing to position, and a riveting sleeve arranged on the riveting head and used for riveting the bearing hole on the steering gear housing, and a plurality of riveting sleeves are provided; The rotary rivet sleeves are installed on the rotary rivet head through a positioning assembly, and all the rotary rivet sleeves are evenly distributed along the circumference; The positioning assembly comprises a positioning shaft connected to the rotary riveting head and a bearing sleeved on the positioning shaft, wherein the bearing is located between the positioning shaft and the rotary riveting sleeve.

2. The bearing hole riveting tool for the electric power steering housing according to claim 1, characterized in that: The positioning shaft is fixedly mounted on the rivet head via a locking bolt.

3. The bearing hole riveting tool for the electric power steering housing according to claim 1, characterized in that: The rotary riveting sleeves are provided with three in total.

4. The bearing hole riveting tool for the electric power steering housing according to any one of claims 1 to 3, characterized in that: The positioning member comprises a pressing portion and a positioning portion. The pressing portion is configured to apply pressure to the housing bearing and the steering gear housing, and the positioning portion is configured to be embedded in the center hole of the housing bearing.

5. The bearing hole riveting tool for the electric power steering housing according to claim 4, characterized in that: The positioning member also includes a screw rod, which is connected to the pressing portion and the positioning portion. The pressing portion is located above the positioning portion, and the diameter of the pressing portion is greater than the diameter of the positioning portion.

6. The bearing hole riveting tool for the electric power steering housing according to claim 5, characterized in that: The positioning member also includes a screwing portion, which is connected to the pressing portion and is located above the pressing portion.

7. The bearing hole riveting tool for the electric power steering housing according to claim 6, characterized in that: The screwing portion is a regular hexagon.

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