Universal tooling for press fitting scroll motor compressor rotor assemblies and method of use

Abstract

The application discloses a general tool for press-fitting a scroll motor compressor rotor combination and a use method, and has the advantages of simple structure and convenient operation. The eccentric shaft is positioned in eccentric shaft positioning holes one and two of a base, a secondary balance block of a motor rotor is positioned in a secondary balance block positioning groove of a pressing head, a pair of guide columns are matched with a pair of guide column guide holes of a pressing head combination, finally, the pressing head combination is pressed downward to the end face of the large end of a pair of positioning columns by using a pressing machine, and the press-fitting of a set of rotor combination is completed.

Description

Technical Field

[0001] This invention relates to the field of mechanical press-fitting technology, and in particular to a general tooling and method for press-fitting rotor assemblies of scroll electric compressors. Background Technology

[0002] Scroll electric compressors are widely used in new energy vehicles of various displacements. The rotor assembly, as one of the core components of the scroll electric compressor, requires high precision in terms of position and coaxiality during assembly. This necessitates a high-precision press-fitting fixture to press-fit the rotor assembly and achieve the required assembly position. Currently, there are more than ten different models of scroll electric compressors circulating in the mainstream market. Each model requires different rotor assemblies, and each rotor assembly requires an investment of tens to hundreds of thousands of yuan in specialized press-fitting equipment. In today's highly competitive market, manufacturers of multiple scroll electric compressor models are forced to invest heavily in specialized press-fitting equipment for various rotor assemblies. For companies that are constantly phasing out older products and transitioning to mass production of new products, this large initial production cost is unbearable. To reduce the equipment cost required for press-fitting rotor assemblies, a universal fixture for pressing various rotor assemblies needs to be invented. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a universal tooling and method for press-fitting rotor assemblies of scroll electric compressors. It has a simple structure, is easy to operate, and can efficiently press-fit qualified rotor assemblies, thereby reducing production costs.

[0004] The objective of this invention is achieved as follows:

[0005] A general-purpose tooling for press-fitting a rotor assembly of a scroll electric compressor includes a base and a press head assembly. A pair of guide posts and a pair of positioning posts are erected on the base, arranged in a cross pattern along the edge of the base. The press head assembly includes a press head cavity seat and a press head. The press head cavity seat slides with the pair of guide posts. The positioning posts are stepped shafts. The lower end of the press head cavity seat is supported on the end face of the larger end of the pair of positioning posts. An adjusting washer set is fitted onto the smaller end of the positioning post. The upper end of the adjusting washer set is positioned on the stepped surface of the positioning post, and the lower end of the adjusting washer set is supported on the upper surface of the base. The smaller end of the positioning post is fixed to the base by a fixing screw. The adjusting washer set is used to adjust the axial distance of the press-fitting. Different thicknesses of adjusting washer sets are selected according to different models and specifications of rotor assemblies.

[0006] The pressure head cavity seat has a pressure head positioning hole in the center. The pressure head is fitted into the pressure head positioning hole and fixed by axial screws. The pressure head has a secondary balance block positioning groove and an eccentric shaft guide hole. The secondary balance block positioning groove of the pressure head is used to cooperate with the secondary balance block on the rotor for positioning. The eccentric shaft guide hole is used to cooperate with the large diameter section of the eccentric shaft for guidance. The secondary balance block positioning groove forms a circumferential limit on the rotor. Different pressure heads are selected according to different models and specifications of rotor combinations.

[0007] An eccentric shaft positioning hole one is provided at the center of the upper surface of the base. An eccentric shaft positioning hole two is provided at the bottom of the hole one. The eccentric shaft positioning hole one is used to fit and limit the end of the large diameter section of the eccentric shaft. The bottom of the eccentric shaft positioning hole one is axially positioned on the end of the large diameter section of the eccentric shaft. The eccentric shaft positioning hole two is used to fit and limit the small diameter section of the eccentric shaft. The eccentric shaft positioning hole two forms a circumferential limit on the eccentric shaft. The circumferential relative position of the rotor and the eccentric shaft after circumferential limitation is the same as that of the rotor of the corresponding model and specification.

[0008] Preferably, the line connecting the center of the middle hole of the auxiliary balance block and the center of the rotor, and the line connecting the centers of the large diameter section and the small diameter section of the eccentric shaft, form an angle α; the eccentric distance between the center of the small diameter section of the eccentric shaft and the line connecting the center of the middle hole of the auxiliary balance block and the center of the rotor is L2; ​​the eccentric distance between the center of the small diameter section of the eccentric shaft and the line connecting the centers of the two side holes of the auxiliary balance block is L3.

[0009] The pressure head is provided with a pair of countersunk screw holes, which are symmetrically arranged. One of the countersunk screw holes is located in the middle of the positioning groove of the secondary balance block. The line connecting the axes of the pair of countersunk screw holes and the line connecting the axes of the first and second eccentric shaft positioning holes form an angle α. The eccentricity of the axis of the second eccentric shaft positioning hole relative to the line connecting the axes of the pair of countersunk screw holes is L2. The eccentricity of the axis of the second eccentric shaft positioning hole relative to the line connecting the axes of the arc-shaped parts at both ends of the positioning groove of the secondary balance block is L3.

[0010] The pressure head cavity seat is provided with a pair of guide post guide holes and a pair of screw holes. The pair of screw holes are set to correspond to the screw countersunk holes and are used to fix the pressure head. The axis connecting the axis of the pair of guide post guide holes and the axis connecting the axis of the pair of screw holes form an angle α.

[0011] The base is provided with a pair of positioning pin positioning holes and a pair of guide pin positioning holes. The axes of the pair of guide pin positioning holes, eccentric shaft positioning hole one, and eccentric shaft positioning hole two are located on the same straight line.

[0012] Preferably, the end faces of the pair of positioning posts and the pair of guide posts are provided with screw holes, and the bottom plane of the base is provided with four countersunk screw holes. The fixing screws fix the pair of positioning posts and the pair of guide posts to the base through the countersunk screw holes.

[0013] A method for using a universal tooling for press-fitting a rotor assembly of a scroll electric compressor involves placing an eccentric shaft into the eccentric shaft positioning hole one and eccentric shaft positioning hole two of the base for positioning, then placing the rotor's secondary balance block into the secondary balance block positioning groove of the press head for positioning, then placing a pair of guide pins into the guide pin guide holes of the press head assembly for mating, and finally using a press to press the press head assembly downwards to the end face of the large end of the pair of positioning pins, thus completing the press-fitting of a rotor assembly.

[0014] Due to the adoption of the above technical solution, the present invention has the following beneficial effects:

[0015] This invention utilizes a set of universal tooling, allowing for the quick replacement of pressure heads and adjusting washers (in groups), to press-fit various rotor assemblies. Its simple structure and convenient operation enable efficient pressing of qualified rotor assemblies, reducing production costs and increasing efficiency. Verification after batch pressing of rotor assemblies showed that the rotor assemblies pressed using this invention achieved a 100% pass rate. Attached Figure Description

[0016] Figure 1 This is the assembly front view of the present invention;

[0017] Figure 2 This is an assembly isometric drawing of the present invention;

[0018] Figure 3 This is a schematic diagram of the base of the present invention;

[0019] Figure 4 This is a schematic diagram of the pressure head of the present invention;

[0020] Figure 5 This is a schematic diagram of the pressure head cavity seat of the present invention;

[0021] Figure 6 This is a schematic diagram of the pressure head assembly of the present invention;

[0022] Figure 7 This is a schematic diagram of the positioning post of the present invention;

[0023] Figure 8 This is a schematic diagram of the guide post of the present invention;

[0024] Figure 9 This is a schematic diagram of the adjusting washer of the present invention;

[0025] Figure 10 This is a schematic diagram of the motor rotor of the present invention;

[0026] Figure 11 This is a schematic diagram of the eccentric shaft of the present invention;

[0027] Figure 12 This is a schematic diagram of the rotor assembly of the present invention.

[0028] Figure Labels

[0029] In the attached diagram, 1-base, 2-guide post one, 3-pressure head assembly, 4-guide post two, 5-positioning post one, 6-adjusting washer (grouped), 7-positioning post two, 8-fixing screw, 9-pressure head, 10-pressure head cavity seat, 11-eccentric shaft positioning hole one, 12-guide post positioning hole one, 13-eccentric shaft positioning hole two, 14-positioning post positioning hole one, 15-guide post positioning hole two, 16-positioning post positioning hole two, 17-secondary balance block positioning groove, 18-screw countersunk hole, 19-eccentric shaft guide hole, 20-guide post guide hole one, 21-pressure head positioning hole, 22-screw hole, 23-guide post guide hole two. Detailed Implementation

[0030] The embodiments of the invention will now be described in further detail with reference to the accompanying drawings.

[0031] In this embodiment, the terms "upper," "lower," "left," "right," "front," "rear," "upper end," and "lower end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed or operated in a specific orientation. Therefore, they should not be construed as limiting the present invention.

[0032] A universal tooling for pressing together rotor assemblies of various types of scroll electric compressors, such as... Figure 1 , Figure 2 As shown, it includes a base, guide post one, guide post two, positioning post one, positioning post two, pressure head assembly, adjusting washers (grouped) and fixing screws. The pressure head assembly includes a pressure head cavity seat and a pressure head.

[0033] like Figure 3 , Figure 7 , Figure 8 , Figure 10 , Figure 11 , Figure 12As shown, the base is provided with an eccentric shaft positioning hole one, an eccentric shaft positioning hole two, a positioning post positioning hole one, a positioning post positioning hole two, a guide post positioning hole one, and a guide post positioning hole two. The positional requirements L2 and L3 of the eccentric shaft positioning holes one and two are set to be completely consistent with the positional requirements L2 and L3 of the eccentric shaft central axis, ensuring that the eccentric shaft can be precisely fitted and accurately positioned in the eccentric shaft positioning holes one and two of the base. The positional angle requirement 'a' of the guide post positioning holes one and two of the base with the eccentric shaft positioning hole one is set to be completely consistent with the assembly positional angle requirement 'a' of the rotor assembly central axis, ensuring that after the motor rotor is press-fitted into the eccentric shaft, the assembly position 'a' of the rotor assembly central axis is achieved. The bottom plane of the base is provided with four countersunk screw holes, and the fixing screws connect and fix the positioning posts one and two and the guide posts one and two to the base through the countersunk screw holes.

[0034] like Figure 1 , Figure 3 , Figure 6 , Figure 7 , Figure 8 , Figure 9 , Figure 12 As shown, the small end faces of positioning posts one and two, and guide posts one and two, are provided with screw holes, and the large end faces are provided with anti-rotation sinking holes. After positioning posts one and two, and guide posts one and two are precisely assembled with the corresponding positioning holes of the base, fixing screws are used to fix positioning posts one and two, and guide posts one and two to the base through the screw countersunk holes of the base, thus uniquely determining the position of the guide posts. Through the anti-rotation sinking holes, positioning posts one and two, and guide posts one and two can be quickly tightened or loosened on the base or removed from the base. The length L of the large end of positioning posts one and two, plus the total distance after adding the thickness of the adjusting washers (groups), is set to be uniquely related to the position requirement L1 of the corresponding model rotor assembly. After the pressure head assembly moves downward through guide posts one and two to the large end faces of positioning posts one and two, the position requirement L1 of the rotor assembly is uniquely determined.

[0035] like Figure 5 , Figure 8 , Figure 12 As shown, the pressure head cavity seat is provided with a pressure head positioning hole, a guide post guide hole one, a guide post guide hole two, and a screw hole; the relative positions of the pressure head positioning hole, guide post guide hole one, guide post guide hole two, and screw hole of the pressure head cavity seat are required to be L2, L3, and a, which are set to be completely consistent with the assembly position requirements L2, L3, and a of the rotor assembly shaft; the guide post guide hole one and guide post guide hole two of the pressure head cavity seat are set to be precisely clearance fitted with guide posts one and two.

[0036] like Figure 4 , Figure 5 , Figure 10 , Figure 11 , Figure 12As shown, the pressure head is equipped with a secondary balance block positioning groove, an eccentric shaft guide hole, and a screw countersunk hole. The relative positions of the secondary balance block positioning groove, the eccentric shaft guide hole, and the screw countersunk hole of the pressure head are required to be L2, L3, and a, which are set to be completely consistent with the assembly positions of the rotor assembly shaft, L2, L3, and a. The secondary balance block positioning groove of the pressure head is set to be precisely clearance fitted with the secondary balance block part of the motor rotor. The eccentric shaft guide hole of the pressure head is set to be precisely clearance fitted with the eccentric shaft. The outer diameter D of the pressure head is set to be precisely clearance fitted with the pressure head positioning hole of the pressure head cavity seat.

[0037] like Figure 6 , Figure 4 , Figure 5 , Figure 8 , Figure 12 As shown, after the pressure head cavity seat and the pressure head are precisely assembled, they are fixed with screws to form a pressure head assembly. The pressure head assembly can slide up and down in guide pins one and two through guide pin guide holes one and two. The relative positions of guide pin guide holes one and two and the fixing screws of the pressure head assembly are required to be L2, L3 and a, which are set to be completely consistent with the assembly positions of L2, L3 and a of the rotor assembly shaft. The guide pin guide holes one and two of the pressure head assembly are set to be precisely clearance fitted with guide pins one and two. The pressure heads corresponding to various models and specifications of rotor assemblies can be quickly changed on the pressure head assembly by tightening or loosening the fixing screws.

[0038] like Figure 9 As shown, different thicknesses of adjusting washers (groups) are set according to different models and specifications of rotor combinations. Each group of adjusting washers corresponds to a model of rotor combination. After the adjusting washers of each group are assembled with the positioning pins, the corresponding rotor combination position requirement L1 is uniquely determined. The required adjusting washers (groups) can be quickly replaced by adjusting the tightness of the fixing screws.

[0039] As described above, each component of this invention must first meet the design and invention requirements. Then, after each component is assembled into a universal press-fit tooling, the components are precisely matched and mutually constrained, so that a qualified rotor assembly can be press-fitted efficiently.

[0040] Before pressing the rotor assembly, first place the eccentric shaft into the eccentric shaft positioning holes one and two of the base. After confirming that it is in place, place the auxiliary balance block part of the motor rotor into the auxiliary balance block positioning groove of the press head assembly. After confirming that it is in place, place the guide pins one and two into the guide pin guide holes one and two of the press head assembly. Finally, use a press to press the press head assembly downwards to the large end face of the positioning pins one and two, completing the press-fitting of a rotor assembly. When the press presses downwards towards the small end face of the press head cavity seat, the pressure is transmitted to the auxiliary balance block on the motor rotor through the auxiliary balance block positioning groove of the press head, causing the motor rotor to move downwards and the eccentric shaft to move upwards relative to the motor rotor. The depth of the eccentric shaft guide hole of the press head ensures that the upper end of the eccentric shaft will not interfere with the press head cavity seat during the press-fitting of the rotor assembly. The press head cavity seat, as an intermediate mechanism for transmitting pressure, does not come into contact with the eccentric shaft.

[0041] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made to it in form and detail without departing from the scope defined by the claims of the present invention.

Claims

1. A universal tooling for press-fitting a scroll electric compressor rotor assembly, characterized in that: The device includes a base and a pressure head assembly. A pair of guide posts and a pair of positioning posts are erected on the base, arranged in a cross pattern along the edge of the base. The pressure head assembly includes a pressure head cavity seat and a pressure head. The pressure head cavity seat slides with the pair of guide posts. The positioning posts are stepped shafts. The lower end of the pressure head cavity seat is supported on the end face of the larger end of the pair of positioning posts. An adjusting washer set is fitted onto the smaller end of the positioning post. The upper end of the adjusting washer set is positioned on the stepped surface of the positioning post, and the lower end of the adjusting washer set is supported on the upper surface of the base. The smaller end of the positioning post is fixed to the base by a fixing screw. The adjusting washer set is used to adjust the axial distance of the press-fit. Different thicknesses of adjusting washer sets are selected according to different models and specifications of rotor assemblies. The pressure head cavity seat has a pressure head positioning hole in the center. The pressure head is fitted into the pressure head positioning hole and fixed by axial screws. The pressure head has a secondary balance block positioning groove and an eccentric shaft guide hole. The secondary balance block positioning groove of the pressure head is used to cooperate with the secondary balance block on the motor rotor for positioning. The eccentric shaft guide hole is used to cooperate with the large diameter section of the eccentric shaft for guidance. The secondary balance block positioning groove forms a circumferential limit on the rotor. Different pressure heads are selected according to different models and specifications of rotor combinations. An eccentric shaft positioning hole one is provided at the center of the upper surface of the base. An eccentric shaft positioning hole two is provided at the bottom of the hole one. The eccentric shaft positioning hole one is used to fit and limit the end of the large diameter section of the eccentric shaft. The bottom of the eccentric shaft positioning hole one is axially positioned on the end of the large diameter section of the eccentric shaft. The eccentric shaft positioning hole two is used to fit and limit the small diameter section of the eccentric shaft. The eccentric shaft positioning hole two forms a circumferential limit on the eccentric shaft. The circumferential relative position of the rotor and the eccentric shaft after circumferential limitation is the same as that of the rotor of the corresponding model and specification.

2. The universal tooling for press-fitting the rotor assembly of a scroll electric compressor according to claim 1, characterized in that: An angle α is formed by connecting the center of the middle hole of the auxiliary balance block and the center of the rotor, and by connecting the centers of the major diameter section and the minor diameter section of the eccentric shaft; the eccentric distance L2 is relative to the line connecting the center of the middle hole of the auxiliary balance block and the center of the rotor; the eccentric distance L3 is relative to the line connecting the centers of the two side holes of the auxiliary balance block. The pressure head is provided with a pair of countersunk screw holes, which are symmetrically arranged. One of the countersunk screw holes is located in the middle of the positioning groove of the secondary balance block. The line connecting the axes of the pair of countersunk screw holes and the line connecting the axes of the first and second eccentric shaft positioning holes form an angle α. The eccentricity of the axis of the second eccentric shaft positioning hole relative to the line connecting the axes of the pair of countersunk screw holes is L2. The eccentricity of the axis of the second eccentric shaft positioning hole relative to the line connecting the axes of the arc-shaped parts at both ends of the positioning groove of the secondary balance block is L3. The pressure head cavity seat is provided with a pair of guide post guide holes and a pair of screw holes. The pair of screw holes are set to correspond to the screw countersunk holes and are used to fix the pressure head. The axis connecting the axis of the pair of guide post guide holes and the axis connecting the axis of the pair of screw holes form an angle α. The base is provided with a pair of positioning pin positioning holes and a pair of guide pin positioning holes. The axes of the pair of guide pin positioning holes, eccentric shaft positioning hole one, and eccentric shaft positioning hole two are located on the same straight line.

3. The universal tooling for press-fitting the rotor assembly of a scroll electric compressor according to claim 1, characterized in that: The end faces of a pair of positioning posts and a pair of guide posts are provided with screw holes, and the bottom plane of the base is provided with four countersunk screw holes. The fixing screws fix the pair of positioning posts and the pair of guide posts to the base through the countersunk screw holes.

4. A method for using a universal tooling for press-fitting a scroll electric compressor rotor assembly, characterized in that: Position the eccentric shaft in the eccentric shaft positioning hole one and eccentric shaft positioning hole two of the base. Then position the rotor's auxiliary balance block in the auxiliary balance block positioning groove of the pressure head. Next, place a pair of guide pins into the guide pin guide holes of the pressure head assembly. Finally, use a press to press the pressure head assembly downwards to the end face of the large end of the pair of positioning pins to complete the press-fitting of a rotor assembly.

Images