Press fitting tool for power assembly bushing

By designing the press-fit tooling of powertrain bushings, including butt limit pressing gaskets and guide bases, the deflection problem of powertrain bushings during small batch pressing is solved, and efficient press-fitting and part protection are achieved.

CN222511523UActive Publication Date: 2025-02-21CHINA FAW CO LTD
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Patent Information

Application Number
CN202421208533.4
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-05-30
Publication Date
2025-02-21
Estimated Expiration
2034-05-30

AI Technical Summary

Technical Problem

In the prior art, when the powertrain bushing is pressed in small batches, the pressure force cannot be realized when the powertrain bushing is pressed. The powertrain bushing cannot be pressed. When entering the subframe, the suspension hole cannot be kept horizontally and downward, which is prone to deflection, which will lead to cracking of the outer bushing and damage to the parts.

Method used

A press-fit tool for powertrain bushings is designed, including a pressing head, a pair of butt limit pressing gaskets and a guide base. The docking limit pressing gasket avoids the missing part and the connecting groove structure of the positioning column to avoid the inner tube of the powertrain bushing, and ensures the powertrain bushing through the guide column and sinking round groove of the guide base. Maintain the correct orientation and position during the pressing process.

Benefits of technology

It realizes efficient pressing of powertrain bushing during small batch pressing, avoiding damage to parts, simple structure, low processing cost, low restructuring difficulty, high pressure assembly efficiency, and small damage rate of parts.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model discloses a press fitting tool for a power assembly bushing. The press fitting tool comprises a pressing head, a pair of butt-joint limiting pressing gaskets and a guide base. Each butt-joint limiting pressing gasket is composed of sheets, the butt-joint side wall faces of the sheets are horizontally and inwards concavely provided with inner pipe avoiding missing parts, pressing sinking grooves are formed in the upper end faces of the sheets, positioning protruding column connecting grooves are symmetrically formed in the lower end faces of the sheets, and the two positioning protruding column connecting grooves are formed in the left side and the right side of each inner pipe avoiding missing part respectively. Two pressing arms are arranged on the lower end face of the pressing head in a protruding mode, and each pressing arm can be inserted into the corresponding pressing sinking groove in a matched mode. The avoidance missing parts of the two inner pipes can form an avoidance hole; the pair of butt-joint limiting pressing gaskets is arranged over the guide base in a suspended mode. The guide base comprises a guide protruding column and a sunken circular groove, and the guide protruding column is arranged in the center of the sunken circular groove; the press-fitting device has the advantages of being simple in structure, low in machining cost, low in modification difficulty, high in press-fitting efficiency, small in part damage rate and the like, installation is easy, and occupied space is small when the press-fitting device is stored.
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Description

Technical Field

[0001] The utility model relates to the technical field of automobile manufacturing, in particular to a press-fitting tool for a powertrain bushing. Background Art

[0002] At present, Hongqi electric vehicles mostly use powertrain bushings with gaskets, see Figure 1 As shown, the powertrain bushing includes an aluminum alloy limiting gasket 1', an inner tube 2', an outer bushing 3' and a bushing rubber ring sleeve 4', the lower end face of the aluminum alloy limiting gasket 1' is connected to the inner tube 2', the aluminum alloy limiting gasket 1' is provided with a matching opening 11' corresponding to the upper end of the inner tube 2', the outer bushing 3' is sleeved on the outside of the inner tube 2', and the bushing rubber ring sleeve 4' is molded and filled between the outer bushing 3' and the inner tube 2', the aluminum alloy limiting gasket 1' is a rectangular inner groove structure as a whole, the upper edges of the two short sides of the rectangular inner groove structure are arc edges, an annular gap is provided between the lower end face of the aluminum alloy limiting gasket 1' and the upper end face of the bushing rubber ring sleeve 4', a plurality of positioning protrusions 41' are provided on the upper end face of the bushing rubber ring sleeve 4' below each arc edge of the rectangular inner groove structure, and the upper end face of the bushing rubber ring sleeve 4' is horizontally extended and protrudes outside the upper end face of the outer bushing 3'.

[0003] The powertrain bushing of this structure is difficult to press-fit in small batches during the trial production stage. The general circular pressing head will interfere with the limit gasket, and the requirement of applying the pressing force to the outer tube of the bushing cannot be achieved. In addition, the wall of the outer bushing is thin, and it needs to be guided when pressed. This will cause the powertrain bushing to fail to maintain horizontal downward movement when pressed into the suspension hole of the subframe. The powertrain bushing as a whole is skewed in the suspension hole. If deflection occurs, the outer bushing will rupture during use, causing damage to parts. Utility Model Content

[0004] In order to solve the above problems, the utility model provides a pressing tool for a powertrain bushing. For the powertrain bushing with a limiting gasket, it has the characteristics of simple structure, low processing cost, low modification difficulty, high pressing efficiency, and low parts damage rate. It has a streamlined structure, is easy to install, and occupies less space when stored.

[0005] The utility model provides a press-fitting tool for a powertrain bushing, comprising a pressing head, a pair of butt-jointed limiting pressing gaskets and a guide base;

[0006] A pair of butt-jointed limit-pressing gaskets have exactly the same structure, and each butt-jointed limit-pressing gasket is made of sheet material. The side wall surface of the butt-jointed sheet material is horizontally inwardly concave with an inner tube avoidance missing portion, and the upper end surface of the sheet material is provided with a pressing sunken groove at one end away from the butt-jointed surface, and the lower end surface of the sheet material is symmetrically provided with positioning protrusion connection grooves, and the two positioning protrusion connection grooves are respectively arranged on the left and right sides of the inner tube avoidance missing portion, and the front ends of the positioning protrusion connection grooves are opened on the side wall surface of the butt-jointed sheet material. After the two butt-jointed limit-pressing gaskets are aligned and contacted, the inner tube avoidance missing portion is surrounded to form a circular or square hole to avoid the outer wall of the inner tube of the powertrain bushing; after the two butt-jointed limit-pressing gaskets are aligned and contacted, the two positioning protrusion connection grooves on the corresponding side form a complete groove, which can be in limited contact with the positioning protrusion of the powertrain bushing;

[0007] A pressing arm is protruding from the lower end surface of the pressing head corresponding to each pressing depression groove, and each pressing arm can be matched and inserted into the corresponding pressing depression groove;

[0008] The butt joint surfaces of a pair of butt joint limit pressing washers are in contact with each other, and the two inner tubes avoid the missing parts to form an avoidance hole; the butt joint pair of butt joint limit pressing washers are suspended directly above the guide base;

[0009] The guide base includes a guide protrusion and a sunken circular groove. The guide protrusion is arranged at the center position of the sunken circular groove. The function of the guide protrusion is to axially position and circumferentially limit the opening of the inner tube of the powertrain bushing and the limiting gasket along its downward movement. The center of the avoidance hole is coaxial with the axis of the guide protrusion.

[0010] The pressing head is a cylinder, and pressing arms are respectively provided on the corresponding two sides of the lower end surface of the cylinder to protrude downward. The pressing groove on the upper end surface of each docking limit pressing gasket is a semi-lunar groove. The cross-sectional shape of the pressing arm matches the shape of the pressing groove. The vertical height of the pressing arm is greater than the groove body height of the pressing groove. The purpose is to suspend the lower end surface of the pressing head between the two pressing arms to avoid the aluminum alloy limit gasket on the upper end of the powertrain bushing to prevent contact between the two.

[0011] A weight-reducing through hole is provided in the middle of the end surface of the pressing head to reduce the deadweight of the pressing head and avoid the upper end of the guide protrusion when pressing the powertrain bushing.

[0012] The shape of the missing part of the inner tube is a semicircular opening or a rectangular opening, and a pair of docking limit pressing gaskets that are in contact with each other constitute a circular opening or a square opening. The function of the circular opening or the square opening is to avoid the outer diameter of the inner tube of the powertrain bushing; the outer contour of the pair of docking limit pressing gaskets that are in contact with each other is a circle, a square or a regular polygon.

[0013] The guide protrusion has a circular cross section, and guide planes are respectively provided on the front and rear side walls. The guide planes can match the short axis end surface of the elliptical cross section inner tube of the powertrain bushing, so that the powertrain bushing moves downward vertically without axial rotation.

[0014] The guide boss of the guide base has an elliptical cross-section, and its structure is designed to match the shape of the inner tube of the powertrain bushing. It plays a role in vertically guiding the inner tube of the powertrain bushing and limiting axial rotation, so as to ensure that the powertrain bushing can descend along the horizontal plane of the guide boss, thereby reducing the chance of damage during part press-fitting.

[0015] A sinking ring is provided circumferentially on the upper edge of the sinking circular groove of the guide base, and the circumferential surface of the sinking ring can support and limit the lower edge of the suspension hole of the subframe, and the bottom of the sinking circular groove can support and limit the lower end surface of the bushing rubber ring sleeve of the powertrain bushing.

[0016] The pressing head, the butt-limiting pressing gasket and the guide base are made of steel or aluminum.

[0017] Beneficial Effects

[0018] The utility model aims at the powertrain bushing with a limiting gasket, has the characteristics of simple structure, low processing cost, low modification difficulty, high pressing efficiency, low parts damage rate, etc., has a streamlined structure, is easy to install, and occupies less space when stored. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of a powertrain bushing in the prior art.

[0020] Figure 2 It is a schematic diagram of the working principle structure of the utility model.

[0021] Figure 3 It is a front structural schematic diagram of the docking limit pressing gasket of the utility model.

[0022] Figure 4 It is a schematic diagram of the reverse structure of the docking limit pressing gasket of the utility model.

[0023] Figure 5 It is a schematic diagram of the structure of the pressing head of the utility model.

[0024] Figure 6 It is a structural schematic diagram of the guide base of the utility model.

[0025] Figure 7 It is a schematic diagram of the guide base structure of another embodiment of the utility model.

[0026] Figure 8 It is a partial cross-sectional structural schematic diagram of the working principle of the utility model.

[0027] In the figure:

[0028] 1', aluminum alloy limit washer; 11', opening; 2', inner tube; 3', outer bushing; 4', bushing rubber ring; 41', positioning protrusion;

[0029] 1. Pressing head; 11. Pressing arm; 12. Weight-reducing through hole;

[0030] 2. Butt-jointed limit pressing gasket; 21. Inner tube avoiding missing part; 22. Pressing down the sinking groove; 23. Positioning boss connecting groove;

[0031] 3. Guide base; 31. Guide protrusion; 311. Guide plane; 32. Sinking circular groove; 321. Sinking ring. DETAILED DESCRIPTION

[0032] In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved clearer, the technical solutions of the present invention are further described below in conjunction with the accompanying drawings and through specific implementation methods. It is understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for the convenience of description, only the parts related to the present invention are shown in the accompanying drawings, rather than all of them.

[0033] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions.

[0034] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] Example 1

[0036] See also Figure 2-Figure 6 As shown, a press-fitting tool for a powertrain bushing includes a press head 1, a pair of butt-jointed limit-pressing gaskets 2, and a guide base 3;

[0037] A pair of butt-jointed position-limiting pressing gaskets 2 have the same structure. Each butt-jointed position-limiting pressing gasket 2 is made of a sheet material. The side wall surface of the butt-jointed sheet material is horizontally inwardly concave with an inner tube avoiding missing portion 21. The upper end surface of the sheet material is provided with a pressing sinking groove 22 at one end away from the butt-jointed surface. The lower end surface of the sheet material is symmetrically provided with positioning protruding column connecting grooves 23. The two positioning protruding column connecting grooves 23 are respectively arranged on the left and right sides of the inner tube avoiding missing portion 21, and the front end of the positioning protruding column connecting groove 23 is opened on the side wall surface of the butt-jointed sheet material.

[0038] A pressing arm 11 is protrudingly provided on the lower end surface of the pressing head 1 corresponding to each pressing depression groove 22, and each pressing arm 11 can be matched and inserted into the corresponding pressing depression groove 22;

[0039] The butt joint surfaces of a pair of butt joint limit pressing gaskets 2 are in contact with each other, and the two inner tube avoidance missing parts 21 form avoidance holes; the butt joint pair of butt joint limit pressing gaskets 2 are suspended directly above the guide base 3;

[0040] The guide base 3 includes a guide protrusion 31 and a sunken circular groove 32 . The guide protrusion 31 is arranged at the center of the sunken circular groove 32 , and the center of the avoidance hole is coaxial with the axis of the guide protrusion 31 .

[0041] The pressing head 1 is a cylinder, and pressing arms 11 are respectively protruding downward on the corresponding two sides of the lower end surface of the cylinder. The pressing groove 22 on the upper end surface of each docking limit pressing gasket 2 is a semi-lunar groove. The cross-sectional shape of the pressing arm 11 matches the shape of the pressing groove 22, and the vertical height of the pressing arm 11 is greater than the groove body height of the pressing groove 22.

[0042] A weight-reducing through hole 12 is provided in the middle of the end surface of the pressing head 1 .

[0043] The inner tube avoiding missing portion 21 is in the shape of a rectangular opening, and the pair of butt-jointed limiting pressing gaskets 2 in contact with each other form a square opening; the outer contour of the pair of butt-jointed limiting pressing gaskets 2 in contact with each other is circular.

[0044] The guide protrusion 31 has a circular cross section, and guide planes 311 are respectively provided on the front and rear side walls.

[0045] The pressing head 1 , the butt-limiting pressing gasket 2 and the guide base 3 are made of aluminum.

[0046] Example 2

[0047] See also Figure 7 As shown, a press-fitting tool for a powertrain bushing is different from the embodiment 1 in that the guide protrusion 31 of the guide base 3 has an elliptical cross-section.

[0048] Example 3

[0049] See also Figure 7As shown, a press-fitting tool for a powertrain bushing is different from Example 2 in that a sinking ring 321 is provided on the sinking circular groove 32 of the guide base 3 along the circumferential direction.

[0050] How it works

[0051] See also Figure 1-Figure 8 As shown, the steps are as follows:

[0052] 1. The first step: insert a pair of butt-jointed limit pressing gaskets 2 with the front side facing upward into the gap between the aluminum alloy limit gasket 1' and the upper end surface of the bushing rubber ring sleeve 4', and the positioning protrusion connection groove 23 of the butt-jointed positioning limit pressing gaskets 2 on the same side is interference fit with the positioning protrusion 41' on the upper end surface of the bushing rubber ring sleeve 4' at the corresponding position, and ensure that the butt joint seam coincides with the center line of the aluminum alloy limit gasket 1' (at this time, the semi-lunar pressing sinking groove 22 on the front side of the pair of butt-jointed limit pressing gaskets 2 is completely exposed and not blocked by the aluminum alloy limit gasket 1') A pair of butt-jointed limit pressing gaskets 2 are completely put together, and the aluminum alloy limit gasket 1' and the bushing rubber ring sleeve 4' fix the upper and lower limit positions of the butt-jointed butt-jointed limit pressing gaskets 2, and the lower end of the suspension hole of the subframe is placed on the sinking ring 32 of the guide base 3, ensuring that the outer wall of the suspension hole is completely placed and stable. At this time, the outer diameter of the butt-jointed butt-jointed limit pressing gasket 2 is larger than the outer tube diameter of the outer bushing 3' by 3mm-5mm, and the diameter of the square hole or circular hole of the butt-jointed butt-jointed limit pressing gasket 2 is larger than the outer diameter of the inner tube 2' by 2mm-3m;

[0053] 2. Step 2: Sleeve the powertrain bushing onto the upper end of the guide protrusion 31 of the guide base 3, and onto the upper end of the suspension hole of the subframe, ensuring that the powertrain bushing is in the correct direction, and drop the pressing head 1 to ensure that the two pressing arms 11 of the pressing head 1 are completely embedded in the semi-lunar pressing sinking groove 22;

[0054] 3. Step 3: Press the powertrain bushing into the suspension hole of the subframe to complete the press-fitting work.

[0055] Although the present invention has been specifically demonstrated and described in conjunction with the preferred embodiments, those skilled in the art should understand that various changes may be made to the present invention in form and detail without departing from the spirit and scope of the present invention as defined in the appended claims, all of which are within the scope of protection of the present invention.

Claims

1. A press-fitting tool for a powertrain bushing, characterized in that: It comprises a pressing head (1), a pair of butt-jointed limiting pressing pads (2) and a guide base (3); A pair of butt-jointed position-limiting pressing gaskets (2) have completely the same structure. Each butt-jointed position-limiting pressing gasket (2) is made of a sheet material. The butt-jointed side wall surface of the sheet material is horizontally inwardly concavely provided with an inner tube avoiding missing portion (21). The upper end surface of the sheet material is provided with a pressing sinking groove (22) at one end away from the butt-jointed surface. The lower end surface of the sheet material is symmetrically provided with a positioning protruding column connecting groove (23). The two positioning protruding column connecting grooves (23) are respectively arranged on the left and right sides of the inner tube avoiding missing portion (21), and the front end of the positioning protruding column connecting groove (23) is open on the butt-jointed side wall surface of the sheet material. A pressing arm (11) is protrudingly provided on the lower end surface of the pressing head (1) at a position corresponding to each pressing depression groove (22), and each pressing arm (11) can be matched and inserted into the corresponding pressing depression groove (22); The butt joint surfaces of a pair of butt joint limit pressing washers (2) are in contact with each other, and the two inner tube avoidance missing parts (21) form avoidance holes; the butt joint pair of butt joint limit pressing washers (2) are suspended directly above the guide base (3); The guide base (3) comprises a guide protrusion (31) and a sunken circular groove (32); the guide protrusion (31) is arranged at the center of the sunken circular groove (32); and the center of the avoidance hole is coaxial with the axis of the guide protrusion (31).

2. The press-fitting tool for a powertrain bushing according to claim 1, characterized in that: The pressing head (1) is a cylinder, and pressing arms (11) are respectively provided on the corresponding two sides of the lower end surface of the cylinder to protrude downwards, and the pressing groove (22) on the upper end surface of each docking limit pressing gasket (2) is a half-moon groove, the cross-sectional shape of the pressing arm (11) matches the shape of the pressing groove (22), and the vertical height of the pressing arm (11) is greater than the groove body height of the pressing groove (22).

3. The press-fitting tool for a powertrain bushing according to claim 2, characterized in that: A weight-reducing through hole (12) is provided in the middle of the end surface of the pressing head (1).

4. The press-fitting tool for a powertrain bushing according to claim 3, characterized in that: The inner tube avoiding missing portion (21) is in the shape of a semicircular opening or a rectangular opening, and a pair of butt-jointed limiting pressing pads (2) in contact with each other form a circular opening or a square opening; the outer contour of the pair of butt-jointed limiting pressing pads (2) in contact with each other is circular, square or regular polygonal.

5. The press-fitting tool for a powertrain bushing according to claim 4, characterized in that: The guide protrusion (31) has a circular cross section, and guide planes (311) are respectively provided on the front and rear side walls.

6. The press-fitting tool for a powertrain bushing according to claim 5, characterized in that: The guide protrusion (31) of the guide base (3) has an elliptical cross section.

7. The press-fitting tool for a powertrain bushing according to claim 6, characterized in that: A sinking ring (321) is provided along the circumferential direction on the sinking circular groove (32) of the guide base (3).

8. The press-fitting tool for a powertrain bushing according to claim 7, characterized in that: The pressing head (1), the butt-jointed limit pressing gasket (2) and the guide base (3) are made of steel or aluminum.