Rack conveying device in steering engine assembly process

Abstract

The utility model relates to the technical field of steering systems, in particular to a rack conveying device in the assembling process of a steering engine. A rack conveying device in the assembling process of a steering engine comprises a rack containing tool, a rack lifting mechanism, a height positioning dead gear and a buffering mechanism and is characterized in that the rack containing tool is arranged on the rack lifting mechanism, and the height positioning dead gear and the buffering mechanism are arranged above the rack containing tool. Compared with the prior art, the rack conveying device in the assembly process of the steering engine solves the problems that the axial length reference is unstable when a rack is pushed and the rack collapses and collides in the radial pushing process so as to meet the requirements of fast rhythm, high productivity and stable production.

Description

Technical Field

[0001] The utility model relates to the technical field of steering systems, in particular to a rack transmission device in the assembly process of a steering machine. Background Art

[0002] At present, in the field of EpsDP steering gear assembly, in order to achieve a tight fit between the three raw materials of the rack, steering housing, and motor, it is necessary to use the motor gear correction mechanism, the housing clamping and positioning mechanism, and the rack pushing mechanism to cooperate with each other to achieve the tooth-to-tooth meshing assembly of the rack and the motor. Before assembling the rack motor, the gear correction mechanism needs to be completed to correct the teeth of the motor pinion to ensure a fixed angle for assembly; the housing correction mechanism needs to complete the correction of the housing assembly reference angle to ensure that the motor and the housing do not collide during assembly; the rack pushing mechanism needs to complete the oiling of the rack and the guarantee of the rack rotation angle and assembly position accuracy to ensure that when the motor angle is constant and it is lowered according to the designed assembly angle of 15 degrees, it can accurately mesh with the rack, and then synchronously lower the NC4 axis and the rack push NC2 axis, and assemble them synchronously to complete the assembly of the rack and the motor.

[0003] Due to the existing rack pushing structure, the gap after placing the rack is too large, and due to design reasons, the rack length varies from 639-712mm. The rack pushing mechanism needs to be compatible with 9 racks of different lengths and 4 racks of different diameters. The rack is prone to collision with the shell during pushing, resulting in deformation of the machine tool, long maintenance time, high maintenance cost, and poor compatibility, making it difficult to achieve compatible production of all models. Summary of the Invention

[0004] In order to overcome the shortcomings of the existing technology, the utility model provides a rack transmission device in the steering gear assembly process, which solves the problems of unstable axial length reference when the rack is pushed and rack collapse and collision during radial pushing, so as to meet the needs of fast beat, high production capacity and stable production.

[0005] To achieve the above purpose, a rack transmission device for the steering gear assembly process is designed, including a rack placement tooling, a rack lifting mechanism, a height positioning dead stop and a buffer mechanism. The characteristics are: a rack placement tooling is provided on the rack lifting mechanism, and a height positioning dead stop and a buffer mechanism are provided above the rack placement tooling.

[0006] The rack lifting mechanism includes a lifting cylinder, a slide rail, a translation cylinder, a mobile platform, a slider, and a base plate. A base plate is provided on the rear side of the rack placement tooling. The left and right sides of the base plate are respectively connected to the slide rails. The slide rails are respectively connected to the mobile platform through sliders. The mobile platform is connected to the translation cylinder. The output end of the translation cylinder is connected to the bottom of the rack placement tooling through a cylinder connector; the lifting cylinder is connected to one side of the mobile platform.

[0007] The rack placement tooling includes a base, a tooth surface profiling positioning seat, a rack positioning seat, and an end limit seat. Several rack positioning seats are provided on the base, one end of which is connected to the tooth surface profiling positioning seat, and the other end of the base is connected to the end limit seat.

[0008] The tooth surface profiling positioning seat is in a convex structure, and a tooth surface profiling convex block is provided in the middle of the tooth surface profiling positioning seat. Both sides of the tooth surface profiling convex block are connected to the base by bolts.

[0009] The rack positioning seat is a "C"-shaped frame structure, the opening of the rack positioning seat faces upward, and the bottom of the rack positioning seat is connected to the base by bolts.

[0010] The end limit seat is in an L-shaped structure, and the bottom of the end limit seat is connected to the base by bolts.

[0011] The base of the rack placement tool is connected to the translation cylinder of the rack lifting mechanism through a cylinder connector.

[0012] The height positioning dead stop and buffer mechanism comprises a positioning dead stop block and a buffer, and the positioning dead stop block is connected to the buffer.

[0013] The positioning dead stop block is in a convex structure. The bottom of the positioning dead stop block is connected to the bottom plate of the rack lifting mechanism by bolts, and the top side of the positioning dead stop block is connected to the buffer.

[0014] Compared with the existing technology, the utility model provides a rack transmission device in the steering gear assembly process, which solves the problems of unstable axial length reference when the rack is pushed and rack collapse and collision during radial pushing, so as to meet the needs of fast beat, high production capacity and stable production.

[0015] This utility model not only solves the problem of unstable position caused by model differences during rack placement and transportation, which in turn causes various impact shutdown accidents, but also improves the life of the lifting mechanism spare parts. Compared with the previous integrated slide cylinder, which was damaged once a quarter, the life of the new structure will be extended by 2-3 years. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic structural diagram of the utility model.

[0017] Figure 2 This is a structural diagram of the rack placement tooling in the utility model.

[0018] Figure 3 This is a schematic diagram of the structure of the tooth surface contour positioning seat in the rack placement tooling.

[0019] Figure 4 It is a structural diagram of the high-position dead gear and buffer mechanism in the utility model. DETAILED DESCRIPTION

[0020] The present invention will be further described below with reference to the accompanying drawings.

[0021] like Figure 1 As shown, a rack placement tool 2 is provided on the rack lifting mechanism 1, and a height positioning dead stop and buffer mechanism 3 is provided above the rack placement tool 2.

[0022] The rack lifting mechanism 1 includes a lifting cylinder, a slide rail, a translation cylinder, a mobile platform, a slider, and a base plate. A base plate 1-6 is provided on the rear side of the rack placement tooling 2. The left and right sides of the base plate 1-6 are respectively connected to the slide rails 1-2. The slide rails 1-2 are respectively connected to the mobile platform 1-4 through sliders 1-5. The mobile platform 1-4 is connected to the translation cylinder 1-3. The output end of the translation cylinder 1-3 is connected to the bottom of the rack placement tooling 2 through a cylinder connector; the lifting cylinder 1-1 is connected to one side of the mobile platform 1-4.

[0023] The rack lifting mechanism 1 is in the form of a lifting cylinder 1-1 plus a double-sided slide rail 1-2, which can prevent the slide cylinder from shaking when it is fully traveled. The translation cylinder 1-3 drives the mobile platform 1-4 to move left and right; the lifting cylinder 1-1 drives the mobile platform 1-4 to move up and down along the slide rails 1-2 and sliders 1-5 on the left and right sides, so that the stability of the overall structure is greatly increased.

[0024] The function of the rack lifting mechanism 1 is to solve the radial offset caused by the lifting of racks of different lengths by solving the stability of the rack lifting, thereby avoiding the subsequent assembly collision problem caused by height differences during the rack lifting process.

[0025] like Figure 2 , Figure 3 As shown, the rack placement tooling 2 includes a base, a tooth surface profiling positioning seat, a rack positioning seat, and an end limit seat. Several rack positioning seats 2-2 are provided on the base 2-3, one end of which is connected to the tooth surface profiling positioning seat 2-1, and the other end of the base 2-3 is connected to the end limit seat 2-4.

[0026] The tooth surface profiling positioning seat 2-1 is in a "convex" shape. A tooth surface profiling convex block is provided in the middle of the tooth surface profiling positioning seat 2-1. Both sides of the tooth surface profiling convex block are connected to the base 2-3 by bolts.

[0027] The rack positioning seat 2-2 is a "C"-shaped frame structure, the opening of the rack positioning seat 2-2 faces upward, and the bottom of the rack positioning seat 2-2 is connected to the base 2-3 by bolts.

[0028] The end limit seat 2-4 is in an L-shaped structure, and the bottom of the end limit seat 2-4 is connected to the base 2-3 by bolts.

[0029] The base 2-3 of the rack placement tool 2 is connected to the translation cylinder 1-3 of the rack lifting mechanism 1 through a cylinder connector.

[0030] The rack placement tool 2 optimizes the original design of vertical placement of the rack tooth surface, changing it to a horizontal placement with the tooth surface facing downward, and adds a tooth surface contour positioning seat 2-1 to position the rack.

[0031] The function of the rack placement tool 2 is to solve the problem of axial shaking of the rack when the rack length changes in the traditional placement tool, thereby avoiding the problem of unqualified assembly during motor assembly.

[0032] like Figure 4 As shown, the height positioning dead stop and buffer mechanism 3 includes a positioning dead stop block and a buffer, and the positioning dead stop block 3-1 is connected to the buffer 3-2.

[0033] The positioning dead stop block 3-1 is in a "convex" shape. The bottom of the positioning dead stop block 3-1 is connected to the bottom plate 1-6 of the rack lifting mechanism 1 by bolts, and the top side of the positioning dead stop block 3-1 is connected to the buffer 3-2.

[0034] The height positioning dead stop and buffer mechanism 3 is optimized from the original slide cylinder with a dead stop to a design of a buffer 3-2 plus a positioning dead stop block 3-1, avoiding the defects of the cylinder itself (unable to stop stably) and further improving stability.

[0035] The function of the height positioning dead gear and buffer mechanism 3 is to ensure the stability of the cylinder when it stops under load by adapting a suitable buffer 3-2, and to avoid the rack inertia offset caused by excessive speed.

[0036] According to different similar racks, a special rack placement tool 2 is customized to be compatible with various types of racks, among which the tooth surface profiling positioning seat 2-1 is the key point of positioning; by separating the driving and guiding functions, the jacking cylinder 1-1 is driven and the slide rail 1-2 is guided and positioned, avoiding the defects of the original slide cylinder itself; by increasing the buffer 3-2 and the positioning dead block 3-1, the jacking cylinder 1-1 is stably stopped, avoiding the rack position shaking caused by pneumatic inertia under high-load and rapid movement.

[0037] This utility model optimizes the rack placement method, moving from top-end positioning that relied on operator skill to ensure accuracy to using a molded fixture for positioning, thus avoiding axial movement. The drive method of the rack lifting mechanism is optimized, avoiding the inherent hardware deficiencies of the integrated slide cylinder. By separating the drive and guide, stable rack transportation is achieved. In particular, the same floating amount is avoided in the case of different rack lengths, resulting in different changes in rack length, which can lead to abnormal rack clamping and collision during the next assembly step.

[0038] This utility model not only solves the problem of unstable position caused by model differences during rack placement and transportation, which in turn causes various impact shutdown accidents, but also improves the life of the lifting mechanism spare parts. Compared with the previous integrated slide cylinder, which was damaged once a quarter, the life of the new structure will be extended by 2-3 years.

[0039] In summary, the utility model has a simple structure, wide application, easy replacement and remodeling, better flexibility, good economical use and long service life in the field of steering motor assembly.

Claims

1. A rack transmission device used in the assembly process of a steering gear, comprising a rack placement tool, a rack lifting mechanism, a height positioning dead stop and a buffer mechanism, characterized in that: A rack placement tool (2) is provided on the rack lifting mechanism (1), and a height positioning dead stop and buffer mechanism (3) is provided above the rack placement tool (2).

2. The rack transmission device in the steering gear assembly process according to claim 1, characterized in that: The rack lifting mechanism (1) includes a lifting cylinder, a slide rail, a translation cylinder, a mobile platform, a slider, and a base plate. A base plate (1-6) is provided on the rear side of the rack placement tooling (2). The left and right sides of the base plate (1-6) are respectively connected to the slide rails (1-2). The slide rails (1-2) are respectively connected to the mobile platform (1-4) through sliders (1-5). The mobile platform (1-4) is connected to the translation cylinder (1-3). The output end of the translation cylinder (1-3) is connected to the bottom of the rack placement tooling (2) through a cylinder connector. One side of the mobile platform (1-4) is connected to the lifting cylinder (1-1).

3. The rack transmission device in the steering gear assembly process according to claim 1, characterized in that: The rack placement tool (2) comprises a base, a tooth surface profiling positioning seat, a rack positioning seat, and an end limit seat. The base (2-3) is provided with a plurality of rack positioning seats (2-2), one end of which is located on the base (2-3) and is connected to the tooth surface profiling positioning seat (2-1), and the other end of which is located on the base (2-3) and is connected to the end limit seat (2-4).

4. The rack transmission device in the steering gear assembly process according to claim 3, characterized in that: The tooth surface profiling positioning seat (2-1) is in a "convex"-shaped structure, and a tooth surface profiling convex block is provided in the middle of the tooth surface profiling positioning seat (2-1), and both sides of the tooth surface profiling convex block are connected to the base (2-3) by bolts.

5. The rack transmission device in the steering gear assembly process according to claim 3, characterized in that: The rack positioning seat (2-2) is a "C"-shaped frame structure, the opening of the rack positioning seat (2-2) faces upward, and the bottom of the rack positioning seat (2-2) is connected to the base (2-3) by bolts.

6. The rack transmission device in the steering gear assembly process according to claim 3, characterized in that: The end limit seat (2-4) is in an L-shaped structure, and the bottom of the end limit seat (2-4) is connected to the base (2-3) by bolts.

7. The rack transmission device in the steering gear assembly process according to claim 1 or 3, characterized in that: The base (2-3) of the rack placement tool (2) is connected to the translation cylinder (1-3) of the rack lifting mechanism (1) via a cylinder connector.

8. The rack transmission device in the steering gear assembly process according to claim 1, characterized in that: The height positioning dead stop and buffer mechanism (3) comprises a positioning dead stop block and a buffer, and the positioning dead stop block (3-1) is connected to the buffer (3-2).

9. The rack transmission device in the steering gear assembly process according to claim 8, characterized in that: The positioning dead stop block (3-1) has a "convex"-shaped structure. The bottom of the positioning dead stop block (3-1) is connected to the bottom plate (1-6) of the rack lifting mechanism (1) by bolts, and the top side of the positioning dead stop block (3-1) is connected to the buffer (3-2).

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