Plastic outer pipe auxiliary frame bushing
By introducing semi-through groove and through-type groove structure into the plastic outer pipe of the subframe bushing of the automobile chassis, combining the vulcanized connection between the rubber main spring and the inner core, the cracking of the plastic outer pipe during the shrinkage process is solved. The problem is that the stable pressing and high stiffness of the bushing are achieved, reducing production costs and labor consumption.
Patent Information
- Application Number
- CN202420655148.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-29
- Publication Date
- 2024-12-20
- Estimated Expiration
- 2034-03-29
AI Technical Summary
The plastic outer pipe of the existing automobile chassis subframe bushing is prone to cracking during the shrinking process, resulting in parts failure and increasing production costs and labor consumption.
The semi-through groove and through-type groove structure are adopted to deform the wall thickness area and the thin wall area, reduce the deformation of the thin wall area, prevent cracking, and provide axial limit through the vulcanized connection between the rubber main spring and the inner core. Position and vibration isolation functions.
Effectively prevent the thin wall area from deforming too much and breaking, so that the bushing can be pressed into the subframe casing smoothly, reduce production costs and labor consumption, and improve the overall stiffness and stability of the parts.
Smart Images
Figure CN222208638U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of auxiliary frame bushings for automobile chassis, in particular to an auxiliary frame bushing with a plastic outer tube. Background Art
[0002] As the requirements for lightweight automobiles become higher and higher, a large number of engineering plastics are used in automobiles. In automobile chassis parts, rubber bushings used for vibration isolation, especially subframe bushings, often have plastic outer tubes. In the past, the outer tubes of subframe bushings were usually made of stamped aluminum or steel and other metal materials, which were relatively expensive. In addition, after the metal outer tube bushings were vulcanized, a reduction process was required to eliminate the internal stress of rubber cooling and shrinkage, which further increased the cost. The plastic outer tube using injection molding is pressed into the subframe sleeve with a large interference fit, thereby achieving the effect of reducing the diameter and eliminating the reduction process.
[0003] In order to meet the stiffness requirements of the bushing, the inside of the plastic outer tube needs to be made into a special-shaped structure, that is, there are local thick wall areas and thin wall areas. In addition, the thick wall area also provides a skeleton support for the axial limit block of the bushing. However, this special-shaped structure will cause the bushing to have little or no deformation in the thick wall area when it is assembled into the subframe sleeve, while the thin wall area has a large deformation. The large deformation in the thin wall area causes it to crack, resulting in overall failure of the part. Since the material of the plastic outer tube is often a mixture of nylon and glass fiber, it has a certain degree of brittleness, so a large reduction in diameter will cause the plastic outer tube to have the risk of cracking. When the plastic outer tube cracks, the part is judged to have failed, and the entire subframe system will also be of unqualified quality. Therefore, a lot of manpower is required to press the cracked bushing out of the subframe sleeve.
[0004] To this end, we propose a plastic outer tube subframe bushing. Utility Model Content
[0005] In view of the shortcomings of the above-mentioned existing production technology, the applicant provides a plastic outer tube subframe bushing, so that in the initial stage when the bushing is pressed into the subframe sleeve, the thick wall area and the thin wall area are deformed together through the semi-through groove and the through groove, so as to reduce the deformation of the thin wall area and prevent the thin wall area from being excessively deformed and ruptured.
[0006] The technical solution adopted by the utility model is as follows:
[0007] A plastic outer tube subframe bushing, comprising:
[0008] The plastic outer tube has a special-shaped structure arranged inside, wherein the special-shaped structure is thin-walled areas and thick-walled areas arranged alternately, and the thick-walled areas include solid-direction thick-walled areas and hollow-direction thick-walled areas;
[0009] A rubber main spring, disposed in a plastic outer tube;
[0010] An inner core, arranged in the rubber main spring;
[0011] Among them, the rubber main spring connects the inner core and the plastic outer tube through vulcanization; the solid direction wall thickness area is provided with a semi-through groove, and the hollow direction wall thickness area is provided with a through groove. In the initial stage when the bushing is pressed into the subframe sleeve, the semi-through groove and the through groove make the thick wall area deform together with the thin wall area, so as to reduce the deformation of the thin wall area and prevent the thin wall area from being excessively deformed and ruptured.
[0012] It is further characterized by:
[0013] A limiting plate is arranged at the bottom of the rubber main spring for axial limiting.
[0014] The inner core is made of metal.
[0015] There are four thin-wall areas and four thick-wall areas.
[0016] The four wall thickness regions include two solid direction wall thickness regions and two hollow direction wall thickness regions.
[0017] The solid direction wall thickness region and the hollow direction wall thickness region are arranged at intervals.
[0018] The beneficial effects of the utility model are as follows:
[0019] The utility model has a compact and reasonable structure and is easy to operate. The inner core is arranged in the rubber main spring, the rubber main spring is arranged in the plastic outer tube, the limit plate is arranged at the bottom of the rubber main spring, and the inner core, the plastic outer tube and the limit plate are connected by vulcanization. In the initial stage of the bushing being pressed into the sub-frame sleeve, the thick wall area in the hollow direction is deformed inwardly through the through groove, the thick wall area in the solid direction is deformed inwardly through the semi-through groove, and the thin wall area can also be deformed inwardly. The thin wall area and the thick wall area are deformed inwardly of the tube wall together, thereby reducing the deformation amount of the thin wall area, preventing the thin wall area from being deformed too much and breaking, so that the bushing can be smoothly pressed into the sub-frame sleeve.
[0020] At the same time, the utility model also has the following advantages:
[0021] (1) There is no rubber main spring in the thick wall area in the hollow direction. There is only a rubber bumper in the thick wall area in the hollow direction. The stiffness effect does not need to be considered. Therefore, a through groove is used.
[0022] (2) There is a rubber main spring in the solid wall thickness area, and the stiffness effect needs to be considered. Therefore, a semi-through groove is set in the solid wall thickness area. In the initial stage when the bushing is pressed into the subframe sleeve, the solid wall thickness area is deformed through the semi-through groove and can meet the stiffness requirements. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] Figure 1 It is a structural schematic diagram of the utility model.
[0024] Figure 2 It is a schematic diagram of the plastic outer tube of the utility model.
[0025] Figure 3 for Figure 2 Top view of the .
[0026] Figure 4 It is the rubber main spring of the utility model.
[0027] Among them: 1. Inner core; 2. Rubber main spring; 3. Plastic outer tube; 301. Thin wall area; 302. Thick wall area in solid direction; 3021. Semi-through groove; 303. Thick wall area in hollow direction; 3031. Through groove; 4. Limit plate. DETAILED DESCRIPTION
[0028] The specific implementation of the present utility model is described below in conjunction with the accompanying drawings.
[0029] like Figure 1-Figure 4 As shown, a plastic outer tube subframe bushing includes an inner core 1, a rubber main spring 2, a plastic outer tube 3 and a limit plate 4. The inner core 1 is made of metal, the inner core 1 is arranged in the rubber main spring 2, the rubber main spring 2 is arranged in the plastic outer tube 3, and the limit plate 4 is arranged at the bottom of the rubber main spring 2. The limit plate 4 is used for axial limit, the rubber main spring 2 plays a role of vibration isolation, and is bolted through the inner core 1.
[0030] In order to meet the stiffness requirements of the bushing, a special-shaped structure is arranged inside the plastic outer tube 3. The special-shaped structure consists of four thick wall areas and four thin wall areas 301. The thick wall areas 301 are arranged at intervals. The four thick wall areas consist of two solid direction thick wall areas 302 and two hollow direction thick wall areas 303. The solid direction thick wall areas 302 and the hollow direction thick wall areas 303 are arranged at intervals.
[0031] The hollow direction wall thickness area 303 is provided with a through groove 3031. To ensure the stiffness ratio between the hollow direction and the solid direction of the bushing, the solid direction wall thickness area 302 is provided with a semi-through groove 3021. There is no rubber main spring 2 in the hollow direction wall thickness area 303. There is only a rubber bumper in the hollow direction wall thickness area 303. There is no need to consider the stiffness influence. Therefore, the through groove 3031 is adopted. There is a rubber main spring 2 in the solid direction wall thickness area 302, and the stiffness effect needs to be considered. Therefore, the solid direction wall thickness area 302 is provided with a semi-through groove 3021. In the initial stage of the bushing being pressed into the subframe sleeve, the hollow direction wall thickness area 303 is deformed inwardly through the through groove 3031, and the solid direction wall thickness area 302 is deformed inwardly through the semi-through groove 3021. The thin-wall area 301 can also be deformed inwardly. The thin-wall area 301 and the thick-wall area are deformed into the tube wall together, thereby reducing the deformation of the thin-wall area 301 and preventing the thin-wall area 301 from being deformed too much and ruptured, so that the bushing can be smoothly pressed into the subframe sleeve.
[0032] In specific use, the inner core 1 is arranged in the rubber main spring 2, the rubber main spring 2 is arranged in the plastic outer tube 3, the limit plate 4 is arranged at the bottom of the rubber main spring 2, and the inner core 1, the plastic outer tube 3 and the limit plate 4 are connected by vulcanization. In the initial stage of the bushing being pressed into the sub-frame sleeve, the hollow direction wall thick area 303 is deformed inwardly through the through groove 3031, the solid direction wall thick area 302 is deformed inwardly through the semi-through groove 3021, and the thin wall area 301 can also be deformed inwardly. The thin wall area 301 and the thick wall area are deformed inwardly of the tube wall together, thereby reducing the deformation amount of the thin wall area 301, preventing the thin wall area 301 from being deformed too much and breaking, so that the bushing can be smoothly pressed into the sub-frame sleeve.
[0033] The above description is an explanation of the utility model, not a limitation of the utility model. The scope of the utility model is defined by the claims. Any form of modification can be made within the protection scope of the utility model.
Claims
1. A plastic outer tube subframe bushing, characterized in that: include: The plastic outer tube (3) has a special-shaped structure arranged inside, wherein the special-shaped structure is thin-walled areas (301) and thick-walled areas arranged alternately, and the thick-walled areas include solid-direction thick-walled areas (302) and hollow-direction thick-walled areas (303); A rubber main spring (2) is arranged inside the plastic outer tube (3); An inner core (1) is arranged inside the rubber main spring (2); The rubber main spring (2) is connected to the inner core (1) and the plastic outer tube (3) by vulcanization; the solid direction wall thickness region (302) is provided with a semi-penetrating groove (3021), and the hollow direction wall thickness region (303) is provided with a through-type groove (3031); in the initial stage when the bushing is pressed into the sub-frame sleeve, the semi-penetrating groove (3021) and the through-type groove (3031) cause the wall thickness region and the wall thickness region (301) to deform together, thereby reducing the deformation amount of the wall thickness region (301) and preventing the wall thickness region (301) from being excessively deformed and ruptured.
2. A plastic outer tube subframe bushing as claimed in claim 1, characterized in that: A limiting plate (4) is provided at the bottom of the rubber main spring (2) for axial limiting.
3. A plastic outer tube subframe bushing as claimed in claim 1, characterized in that: The inner core (1) is made of metal.
4. A plastic outer tube subframe bushing as claimed in claim 1, characterized in that: The number of the thin-walled regions (301) and the number of the thick-walled regions are four.
5. A plastic outer tube subframe bushing as claimed in claim 4, characterized in that: The four wall thickness regions include two solid direction wall thickness regions (302) and two hollow direction wall thickness regions (303).
6. A plastic outer tube subframe bushing as claimed in claim 5, characterized in that: The solid direction wall thickness region (302) and the hollow direction wall thickness region (303) are arranged at intervals.