Rack ejector rod quick-change tool on electric power steering machine production line
The sliding fit structure between the pin and the arc-shaped groove solves the problems of unreliable replacement and difficult disassembly of the rack and pinion push rod, realizes fast and reliable tooling replacement, adapts to tooling requirements of different lengths, and reduces equipment manufacturing costs.
Patent Information
- Application Number
- CN202520538482.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-26
- Publication Date
- 2025-12-30
- Estimated Expiration
- 2035-03-26
AI Technical Summary
The existing method of replacing the rack and pinion by loosening and tightening the spring pin is unreliable or difficult to disassemble, and it is difficult to adapt to the needs of tooling of different lengths.
It adopts a sliding fit structure of pin and arc-shaped inclined groove, which replaces the traditional rack and pinion connection. It uses compression spring and adjusting nut to realize quick change of tooling of different lengths.
It enables quick and reliable replacement of rack and pinion push rods, adapts to tooling requirements of different lengths, and reduces equipment manufacturing costs.
Smart Images
Figure CN223739881U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of steering system technology, specifically to a rack and pinion quick-change tooling for an electric power steering gear production line. Background Technology
[0002] The automotive industry is developing rapidly, and correspondingly, customer needs are also diverse. The long rack and long stroke requirements of automotive electric power steering systems mean that the range of motion force test benches for automotive steering systems must be increasingly larger. In order to reduce the manufacturing cost of the equipment, different rack push rods are usually set to adapt to this. The replacement of existing rack push rods is achieved by loosening and tightening the spring pin, which has problems such as unreliability or difficulty in disassembly. Summary of the Invention
[0003] To overcome the shortcomings of the prior art, this utility model provides a quick-change tooling for rack push rods on an electric power steering production line. It uses a sliding fit structure between a pin and an arc-shaped groove to replace the traditional rack push rod connection structure, and can be applied to scenarios where different lengths of tooling need to be changed.
[0004] To achieve the above objectives, a quick-change fixture for a rack push rod on an electric power steering production line is designed, comprising a push rod fixture and a base. The base is characterized by being a T-shaped structure integrally formed from a disc-shaped base plate and a cylindrical rod portion. A left arc-shaped groove, a right arc-shaped groove, and a circular through hole are provided on the outer edge of the cylindrical rod portion. The push rod fixture includes a push rod, a slider, a pin, a compression spring, and an adjusting nut. The head of the push rod is connected to the adjusting nut, and a sliding cavity is provided inside the head of the push rod. A slider is located within the sliding cavity, and a compression spring is provided between the slider and the adjusting nut. A pin is connected to the slider, and the push rod fixture is connected to the cylindrical rod portion of the base via the pin.
[0005] The base has a number of fastening bolt holes evenly distributed on its disc-shaped base plate. Protrusions are connected to the upper and lower ends of the disc-shaped base plate, and screw holes are provided on the end faces of the protrusions at the upper and lower ends.
[0006] The base is fixed to the machine tool by bolts passing through the fastening bolt holes on the disc-shaped base plate.
[0007] The cylindrical rod of the base is provided with a left arc-shaped inclined groove and a right arc-shaped inclined groove on its left and right sides, respectively. The left arc-shaped inclined groove and the right arc-shaped inclined groove are arranged symmetrically at the center. The distance between the left arc-shaped inclined groove and the right arc-shaped inclined groove is greater than the length of the pin. A circular through hole is provided on the cylindrical rod located between the left arc-shaped inclined groove and the right arc-shaped inclined groove.
[0008] The top and bottom sides of the push rod are provided with slots for placing pins, and the front and rear sides of the push rod are provided with round holes, with the slots and round holes arranged at 90°. The pin passes through the slots from top to bottom and through the slider. The pin is fastened to the slider by the internal hexagonal set screws in the round holes on the front and rear sides.
[0009] The slots on the upper and lower sides are arranged symmetrically; the round holes on the front and rear sides are arranged symmetrically.
[0010] The push rod is a cylindrical structure, and the diameter of the head of the push rod is smaller than the diameter of the rod body.
[0011] The head size of the top rod matches the inner cylinder size of the cylindrical rod portion of the base.
[0012] Compared with the prior art, this utility model provides a quick-change tooling for rack push rods on an electric power steering production line. It uses a sliding fit structure between a pin and an arc-shaped groove to replace the traditional rack push rod connection structure, and can be applied to scenarios where different lengths of tooling need to be changed. Attached Figure Description
[0013] Figure 1 This is a schematic diagram of the structure of this utility model.
[0014] Figure 2 This is the main view of the base structure in this utility model.
[0015] Figure 3 This is a top view of the base structure in this utility model.
[0016] Figure 4 for Figure 3 Sectional view along the AA direction.
[0017] Figure 5 This is a side view of the base structure in this utility model.
[0018] Figure 6 This is a three-dimensional view of the top rod tooling in this utility model.
[0019] Figure 7 This is the main view of the top rod tooling in this utility model.
[0020] Figure 8 for Figure 7 Sectional view along the BB direction.
[0021] Figure 9 This is a top view of the top rod tooling in this utility model. Detailed Implementation
[0022] The present invention will be further described below with reference to the accompanying drawings.
[0023] like Figures 1 to 9As shown, the base 1 is a T-shaped structure integrally formed from a disc-shaped base plate and a cylindrical rod. A left arc-shaped groove 1.2, a right arc-shaped groove 1.3, and a circular through hole 1.5 are provided on the outer edge of the cylindrical rod. The top rod fixture 2 includes a top rod, a slider, a pin, a compression spring, and an adjusting nut. The head of the top rod 2.1 is connected to the adjusting nut 2.6. A sliding cavity 2.7 is provided inside the head of the top rod 2.1. A slider 2.2 is located inside the sliding cavity 2.7. A compression spring 2.5 is provided between the slider 2.2 and the adjusting nut 2.6. A pin 2.3 is connected to the slider 2.2. The top rod fixture 2 is connected to the cylindrical rod of the base 1 via the pin 2.3.
[0024] The base 1 has a number of fastening bolt holes 1.1 evenly distributed on the disc-shaped base plate. The upper and lower ends of the disc-shaped base plate are respectively connected to the protrusions 1.6, and the end faces of the protrusions 1.6 at the upper and lower ends are respectively provided with screw holes 1.4.
[0025] The base 1 is fixed to the machine tool by bolts passing through the fastening bolt holes 1.1 on the disc-shaped base plate.
[0026] The cylindrical rod of the base 1 has a left arc-shaped inclined groove 1.2 and a right arc-shaped inclined groove 1.3 on its left and right sides, respectively. The left arc-shaped inclined groove 1.2 and the right arc-shaped inclined groove 1.3 are arranged symmetrically at the center. The distance between the left arc-shaped inclined groove 1.2 and the right arc-shaped inclined groove 1.3 is greater than the length of the pin 2.3. A circular through hole 1.5 is provided on the cylindrical rod located between the left arc-shaped inclined groove 1.2 and the right arc-shaped inclined groove 1.3.
[0027] The top rod 2.1 has slots 2.8 for placing pins 2.3 on its upper and lower sides, and round holes 2.9 on its front and rear sides, with the slots 2.8 and round holes 2.9 arranged at 90°. The pin 2.3 passes through the slots 2.8 from top to bottom and through the slider 2.2. The pin 2.3 is fastened to the slider 2.2 by the hexagonal set screws 2.4 in the round holes 2.9 on the front and rear sides.
[0028] The slots 2.8 on the upper and lower sides are arranged symmetrically; the round holes 2.9 on the front and rear sides are arranged symmetrically.
[0029] The push rod 2.1 has a cylindrical structure, and the diameter of the head of the push rod 2.1 is smaller than the diameter of the rod part of the push rod 2.1.
[0030] The head size of the top rod 2.1 matches the inner cylinder size of the cylindrical rod part of the base 1.
[0031] like Figure 1As shown, the base 1 is fixed to the machine tool through the fastening bolt hole 1.1. The push rod fixture 2 is made into different fixtures according to the length required by different steering gears. When changing the type of installation, simply align the pin 2.3 on the push rod fixture 2 with the left arc-shaped inclined groove 1.2 and the right arc-shaped inclined groove 1.3 on the base 1, and rotate it 90° clockwise along the slide rail 1.7 on the left arc-shaped inclined groove 1.2 and the right arc-shaped inclined groove 1.3. The pin 2.3 overcomes the elastic force of the compression spring 2.5 and moves towards the adjusting nut 2.6 in the slot 2.8. When it rotates into the circular through hole 1.5, under the elastic force of the compression spring 2.5, the two ends of the pin 2.3 are stuck in the circular through hole 1.5, and the replacement is completed.
[0032] During disassembly, rotate counterclockwise. Pin 2.3 will overcome the elastic force of the compression spring 2.5 and move backward along the slot 2.8. It will also overcome the friction between pin 2.3 and the circular through hole 1.5, slide out along the slide 1.7, and then be pulled out along the left arc-shaped inclined groove 1.2 and the right arc-shaped inclined groove 1.3.
[0033] Tightening or loosening the compression spring 2.5 adjusts its initial compression force, thereby adjusting the force required for the pin 2.3 to move in the slot 2.8, and thus adjusting the locking force.
Claims
1. A rack ejector rod quick-change tooling on an electric power steering machine production line, comprising an ejector rod tooling and a base, characterized in that: The base (1) is a T-shaped structure of a disc-shaped bottom plate and a cylindrical rod part, and left and right arc-shaped inclined grooves (1.2, 1.3) and a circular through hole (1.5) are arranged on the outer edge of the cylindrical rod part; the ejector pin tool (2) comprises an ejector pin, a sliding block, a pin, a compression spring and an adjusting nut, the head of the ejector pin (2.1) is connected with the adjusting nut (2.6), the inner side of the head of the ejector pin (2.1) is provided with a sliding cavity (2.7), the sliding cavity (2.7) is provided with the sliding block (2.2), the compression spring (2.5) is arranged between the sliding block (2.2) and the adjusting nut (2.6), the sliding block (2.2) is connected with the pin (2.3), and the ejector pin tool (2) is connected with the cylindrical rod part of the base (1) through the pin (2.3).
2. The rack bar ejector rod quick-change tooling for an electric power steering machine production line according to claim 1, characterized in that: The disc-shaped bottom plate of the base (1) is provided with a plurality of fastening bolt holes (1.1), and the upper and lower ends of the disc-shaped bottom plate are connected with protrusions (1.6), and the end faces of the upper and lower protrusions (1.6) are provided with screw holes (1.4).
3. The rack bar ejector rod quick change tooling of claim 2, wherein: The fastening bolt holes (1.1) are at least 8, and the base (1) is fixed on the machine tool through the fastening bolt holes (1.1) on the disc-shaped bottom plate.
4. The rack bar ejector rod quick change tooling for an electric power steering machine production line of claim 1, wherein: The left and right sides of the cylindrical rod part of the base (1) are provided with left and right arc-shaped inclined grooves (1.2, 1.3), and the left and right arc-shaped inclined grooves (1.2, 1.3) are centrally symmetrically arranged, the distance between the left and right arc-shaped inclined grooves (1.2, 1.3) is greater than the length of the pin (2.3), and the cylindrical rod part between the left and right arc-shaped inclined grooves (1.2, 1.3) is provided with a circular through hole (1.5).
5. The rack bar ejector rod quick change tooling for an electric power steering machine production line of claim 1, wherein: The upper and lower sides of the ejector pin (2.1) are provided with slot holes (2.8) for placing the pin (2.3), and the front and rear sides of the ejector pin (2.1) are provided with circular holes (2.9), and the slot holes (2.8) and the circular holes (2.9) are arranged at an angle of 90°; the pin (2.3) penetrates the sliding block (2.2) through the slot holes (2.8) from top to bottom, and the pin (2.3) is fastened to the sliding block (2.2) through the inner hexagonal pointed set screw (2.4) in the front and rear circular holes (2.9).
6. The rack bar ejector rod quick change tooling of claim 5, wherein: The upper and lower slot holes (2.8) are centrally symmetrically arranged; and the front and rear circular holes (2.9) are centrally symmetrically arranged.
7. The rack bar ejector rod quick change tooling for use in an electric power steering machine production line according to claim 1, wherein: The ejector pin (2.1) is a cylindrical structure, and the diameter of the head of the ejector pin (2.1) is smaller than the diameter of the rod part of the ejector pin (2.1).
8. The rack bar ejector rod quick change tooling for use in an electric power steering machine production line according to claim 1, wherein: The size of the head of the ejector pin (2.1) matches the size of the inner cylinder of the cylindrical rod part of the base (1).