Press-fitting reducing mechanism for chassis subframe plastic bushing

Abstract

The utility model discloses a press-fitting reducing mechanism for a chassis subframe plastic bushing, which comprises a bushing direction positioning tool and a bushing reducing tool, the bushing direction positioning tool is provided with a positioning pin for positioning and sleeving the plastic bushing, the plastic bushing is sleeved on the outer wall of the positioning pin, and the bushing reducing tool is arranged on the outer wall of the positioning pin. The lining reducing tool is provided with a conical hole allowing a plastic lining to penetrate through and forming reducing changes, the lining direction positioning tool and the lining reducing tool are arranged at intervals and detachably connected through an elastic connecting assembly, and the lining direction positioning tool and the lining reducing tool can be close to or away from each other. The positioning pin and the taper hole are coaxially arranged, and the side, away from the lining reducing tool, of the positioning pin can be connected with external pressing machine equipment. The bush reducing tool is used for reducing the bush, the structural design is reasonable, the operation is simple, the quality problem that the bush is damaged is avoided, the product percent of pass and the production efficiency are improved, and the manufacturing cost is reduced.

Description

A press-fit diameter reduction mechanism for plastic bushings in chassis subframes Technical Field

[0001] This utility model relates to a press-fitting and diameter reduction mechanism for plastic bushings of chassis subframes, belonging to the field of bushing press-fitting tooling technology. Background Technology

[0002] When a car chassis subframe is used to connect the powertrain, engine mount connection points are often placed on the subframe to reduce engine vibration and torque transmission. These connection points generally use a flexible bushing structure to ensure passenger comfort. The outer tube of this mount bushing is usually made of plastic. However, due to the interference fit, if the outer diameter of the bushing is 2mm larger than the inner diameter of the mount sleeve, directly pressing on it will cause the bushing to crack and break, rendering it unusable. Summary of the Invention

[0003] The technical problem this invention aims to solve is how to prevent the bushing from easily cracking and breaking when pressed into the suspension sleeve of the automotive subframe due to its large outer diameter.

[0004] To solve the above-mentioned technical problems, this utility model provides a press-fit diameter reduction mechanism for plastic bushings of chassis subframes. By reducing the diameter of the bushing, it is easier for the bushing to enter, thereby preventing damage to the outer tube of the bushing during press-fitting.

[0005] To achieve the above-mentioned technical objectives and effects, this application provides the following technical solution:

[0006] A press-fitting and diameter reduction mechanism for plastic bushings in a chassis subframe includes a bushing direction positioning fixture and a bushing diameter reduction fixture. The bushing direction positioning fixture has a positioning pin for positioning the plastic bushing, and the plastic bushing is fitted onto the outer wall of the positioning pin. The bushing diameter reduction fixture has a tapered hole through which the plastic bushing passes and forms a diameter reduction change. The bushing direction positioning fixture and the bushing diameter reduction fixture are spaced apart and detachably connected by an elastic connecting component. The bushing direction positioning fixture and the bushing diameter reduction fixture can be close to or away from each other. The side of the positioning pin that is coaxially arranged with the tapered hole and away from the bushing diameter reduction fixture can be connected to an external press-fitting machine.

[0007] Preferably, the side of the tapered hole facing the bushing direction positioning fixture is the large hole end, and the diameter of the large hole end is larger than the outer diameter of the plastic bushing. The side of the tapered hole away from the bushing direction positioning fixture is the small hole end, and the diameter of the small hole end is equal to the inner diameter of the suspension sleeve to be pressed in.

[0008] Preferably, the bushing orientation positioning fixture further includes a positioning seat, which is fixedly sleeved on the outer wall of the positioning pin.

[0009] Furthermore, the elastic connection assembly includes a sliding column and a sliding column spring. The sliding column is provided with multiple sliding columns, which are respectively inserted through the positioning seat and connected to the bushing diameter reduction fixture. A bolt is screwed to the end of the sliding column away from the bushing diameter reduction fixture to connect the bushing diameter reduction fixture. The positioning seat is slidably disposed between the bolt head and the bushing diameter reduction fixture. The sliding column spring is sleeved on the outside of the sliding column and abuts against the positioning seat and the bushing diameter reduction fixture.

[0010] Furthermore, the plurality of sliding pins are evenly spaced around the circumference of the positioning pin.

[0011] Furthermore, the sliding column and the positioning seat are connected by a transition fit or an interference fit.

[0012] The press-fitting and diameter reduction mechanism for plastic bushings in chassis subframes provided by this utility model has the following advantages:

[0013] This utility model is a press-fitting and diameter reduction mechanism for plastic bushings on chassis subframes. When pressing the plastic bushing to the subframe suspension sleeve, the bushing is placed on the corresponding positioning pin, and then the part is placed on the tooling. The press-fitting machine control switch is started to perform the press-fitting. The structure is reasonably designed and easy to operate. By using the bushing diameter reduction tooling, the quality problem of bushing outer tube breakage is eliminated, the product qualification rate and production efficiency are improved, and the manufacturing cost is reduced. Attached Figure Description

[0014] Figure 1 is a schematic diagram of the assembly structure of a press-fitting and diameter reduction mechanism for a plastic bushing used in a chassis subframe, which is the main embodiment of this utility model.

[0015] Figure 2 is a cross-sectional schematic diagram of the bushing diameter reduction tooling provided in an embodiment of the present invention;

[0016] Figure 3 is a schematic diagram of the assembly of the plastic bushing and the suspension sleeve on the subframe;

[0017] Figure 4 is a cross-sectional structural diagram of the plastic bushing and the upper suspension sleeve of the subframe in the assembled state.

[0018] In the picture:

[0019] 1- Bushing directional positioning fixture; 11- Positioning pin; 12- Positioning seat; 2- Bushing diameter reduction fixture; 21- Tapered hole; 211- Large hole end; 212- Small hole end; 3- Elastic connection assembly; 31- Sliding column; 32- Sliding column spring; 4- Bolt; 5- Plastic bushing; 6- Suspension sleeve. Detailed Implementation

[0020] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0021] Referring to Figures 1-4, a press-fitting and diameter reduction mechanism for a plastic bushing in a chassis subframe includes a bushing direction positioning fixture 1 and a bushing diameter reduction fixture 2. The bushing direction positioning fixture 1 has a positioning pin 11 for positioning the plastic bushing 5. The positioning pin 11 may include, but is not limited to, a cylindrical or conical shape. The plastic bushing 5 is sleeved on the outer wall of the positioning pin 11. The bushing diameter reduction fixture 2 has a conical hole 21 for the plastic bushing 5 to pass through and form a diameter reduction change. The bushing direction positioning fixture 1 and the bushing... The reducing-diameter fixtures 2 are spaced apart and detachably connected via elastic connecting components 3. The bushing direction positioning fixture 1 and the bushing reducing-diameter fixture 2 can be close to or away from each other. The positioning pin 11 is coaxially arranged with the tapered hole 21 and the side away from the bushing reducing-diameter fixture 2 can be connected to an external pressing machine. Then, the pressing machine causes the positioning pin 11 to move the plastic bushing 5 toward the bushing reducing-diameter fixture 2 until it passes through the tapered hole 21, deforms, and is installed into the suspension sleeve 6. The entire installation process is smooth, fast, and efficient. After pressing, the compression rod of the pressing machine retracts. In this embodiment, the installation and use of the pressing machine are existing technologies and will not be described in detail.

[0022] Referring to Figures 1 and 2, the side of the tapered hole 21 facing the bushing direction positioning fixture 1 is the large hole end 211, the diameter of which is larger than the outer diameter of the plastic bushing 5. The side of the tapered hole 21 away from the bushing direction positioning fixture 1 is the small hole end 212, the diameter of which is equal to the inner diameter of the suspension sleeve 6 to be pressed in. The detachable arrangement between the bushing direction positioning fixture 1 and the bushing diameter reduction fixture 2 allows the bushing diameter reduction fixture 2 to be replaced with a bushing diameter reduction fixture 2 that is compatible with the size of the bushing, thereby improving the adaptability and practicality of the press-fit diameter reduction mechanism.

[0023] Referring to Figure 1, the bushing direction positioning fixture 1 also includes a positioning seat 12. The positioning seat 12 is fixedly sleeved on the outer wall of the positioning pin 11. The positioning seat 12 can be integrally formed with the positioning pin 11, or it can be installed and fixed by welding or interference fit. These are all existing technologies and will not be described in detail.

[0024] Furthermore, the elastic connector includes a slide column 31 and a slide column 31 spring. Multiple slide columns 31 are installed and are respectively inserted into the bushing reducing fixture 2 through the positioning seat 12. The end of the slide column 31 facing away from the bushing reducing fixture 2 is screwed with a bolt 4 to connect the bushing reducing fixture 2. The positioning seat 12 is slidably disposed between the head of the bolt 4 and the bushing reducing fixture 2. The slide column 31 spring is sleeved on the outside of the slide column 31 and abuts against the positioning seat 12 and the bushing reducing fixture 2. Multiple slide columns 31 are evenly distributed around the circumference of the positioning pin 11. The slide column 31 and the positioning seat 12 are inserted with a transition fit or an interference fit to ensure that the bushing reducing fixture 2 and the bushing directional positioning fixture 1 are coaxial while ensuring the stability during pressing.

[0025] Referring to Figures 1 and 4, the working principle of the press-fitting and diameter reduction mechanism for the plastic bushing 5 of the chassis subframe provided by this utility model is as follows:

[0026] Taking a plastic bushing 5 with an outer diameter of 101.76 mm and a suspension sleeve 6 with an inner diameter of 99.76 mm as an example.

[0027] In use, the subframe is placed on the press-fitting machine fixture, with support seats A1, A2, A3, and A4 forming a Z-axis support. The suspension sleeve 6 is supported and positioned by support seat A5, ensuring that the suspension sleeve 6 to be pressed in, the bushing diameter reduction fixture 2, and the bushing direction positioning fixture 1 are coaxial. The plastic bushing 5 is then placed on the bushing direction positioning fixture 1. The press-fitting machine control switch is activated to begin pressing. The plastic bushing 5 is then reduced in outer diameter by the bushing diameter reduction fixture 2 until it matches the inner diameter of the suspension sleeve 6 to be pressed in, thus allowing the plastic bushing 5 to be smoothly pressed into the suspension sleeve 6. This invention features a simple structure, high production efficiency, low manufacturing cost, convenient operation, high product quality, and eliminates the problem of bushing damage. The entire process is simple to operate and can be performed by ordinary workers.

[0028] The above description is merely a preferred embodiment of this utility model and is not intended to limit this utility model in any form or substance. It should be noted that those skilled in the art can make various improvements and additions without departing from this utility model, and these improvements and additions should also be considered within the protection scope of this utility model. Any modifications, alterations, and equivalent changes made by those skilled in the art without departing from the spirit and scope of this utility model using the disclosed technical content are equivalent embodiments of this utility model. Furthermore, any modifications, alterations, and evolutions made to the above embodiments based on the essential technology of this utility model are still within the scope of the technical solution of this utility model.

Claims

1. A press-fitting diameter reduction mechanism for plastic bushings in chassis subframes, characterized in that, The device includes a bushing directional positioning fixture (1) and a bushing diameter reduction fixture (2). The bushing directional positioning fixture (1) has a positioning pin (11) for positioning a plastic bushing (5). The plastic bushing (5) is fitted on the outer wall of the positioning pin (11). The bushing diameter reduction fixture (2) has a tapered hole (21) through which the plastic bushing (5) passes and forms a diameter reduction. The bushing directional positioning fixture (1) and the bushing diameter reduction fixture (2) are spaced apart and detachably connected by an elastic connecting component (3). The bushing directional positioning fixture (1) and the bushing diameter reduction fixture (2) can be close to or away from each other. The side of the positioning pin (11) that is coaxial with the tapered hole (21) and away from the bushing diameter reduction fixture (2) can be connected to an external pressing machine.

2. The press-fitting diameter reduction mechanism for a chassis subframe plastic bushing as described in claim 1, characterized in that, The side of the tapered hole (21) facing the bushing-direction positioning fixture (1) is the large hole end (211), the diameter of which is larger than the outer diameter of the plastic bushing (5). The side of the tapered hole (21) away from the bushing-direction positioning fixture (1) is the small hole end (212), the diameter of which is equal to the inner diameter of the suspension sleeve (6) to be pressed in.

3. The press-fitting diameter reduction mechanism for a chassis subframe plastic bushing as described in claim 1, characterized in that, The bushing direction positioning fixture (1) also includes a positioning seat (12), which is fixedly sleeved on the outer wall of the positioning pin (11).

4. The press-fitting diameter reduction mechanism for a chassis subframe plastic bushing as described in claim 3, characterized in that, The elastic connection assembly includes a slide column (31) and a slide column (31) spring. The slide column (31) is provided with multiple slide columns, which are respectively inserted through the positioning seat (12) and connected to the bushing diameter reduction fixture (2). The end of the slide column (31) away from the bushing diameter reduction fixture (2) is screwed with a bolt (4) to connect the bushing diameter reduction fixture (2). The positioning seat (12) is slidably disposed between the head of the bolt (4) and the bushing diameter reduction fixture (2). The slide column (31) spring is sleeved on the outside of the slide column (31) and abuts against the positioning seat (12) and the bushing diameter reduction fixture (2).

5. The press-fitting diameter reduction mechanism for a chassis subframe plastic bushing as described in claim 4, characterized in that, The multiple sliding columns (31) are evenly spaced around the circumference of the positioning pin (11).

6. The press-fitting diameter reduction mechanism for a chassis subframe plastic bushing as described in claim 4, characterized in that, The sliding column (31) and the positioning seat (12) are connected by a transition fit or an interference fit.

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