An outer frame for an automobile chassis and a metal bushing and an injection molding equipment thereof

Abstract

The application relates to the technical field of automobile part injection molding, and discloses an outer frame for an automobile chassis, a metal lining and injection molding equipment thereof, which comprises a workbench, a rotating disc is rotationally arranged at the upper end of the workbench, a discharging groove is formed in one side of the top of the workbench, rotating shafts are rotationally arranged between the inner side walls of the discharging groove, telescopic sleeve rods are rotationally sleeved on the outer surfaces of the rotating shafts, first connecting rods are arranged at the upper ends of the telescopic sleeve rods, second connecting rods are arranged at the lower ends of the telescopic sleeve rods, L-shaped rods are arranged at the ends of the second connecting rods away from the telescopic sleeve rods, arc-shaped discharging plates are rotationally arranged between the inner side walls of the discharging groove, mounting seats are slidably arranged at the lower ends of the discharging groove, one end of the L-shaped rod is connected with the mounting seat, and a jacking rod is arranged on the mounting seat. The injection molding equipment improves the lining forming efficiency through the multi-station rotating injection molding structure, avoids product bumping and deformation through the linkage buffering discharging structure, optimizes the rubber lining structure, and takes into account the damping performance and structural durability.

Description

Technical Field

[0001] This invention relates to the field of injection molding technology for automotive parts, specifically to an outer frame and metal bushing for an automotive chassis and its injection molding equipment. Background Technology

[0002] Automotive chassis metal rubber bushings are core vibration damping components of vehicle suspension systems. They are mainly composed of a metal inner bushing, a rubber elastomer, and a metal outer frame. They can effectively buffer road vibrations and filter bumps and impacts, playing a key role in the ride comfort and chassis structural stability of vehicles. Currently, they are widely used in the chassis assembly of various passenger cars and commercial vehicles. The market demand is large, and the requirements for molding precision and finished product quality are high. Mass production is generally completed using an integrated injection molding and vulcanization process.

[0003] Existing molding equipment involves dropping workpieces directly from a height after injection molding and mold opening, lacking suitable cushioning and stable material guiding structures. Because the newly molded rubber bushings are not fully cured and shaped, the material is highly flexible and the structure is easily deformed. The impact from the drop from a height can easily cause dents, deformations, and surface damage to the rubber parts of the bushings, resulting in a significant reduction in the yield of finished products. At the same time, it is impossible to achieve automated and linked material unloading operations, resulting in poor production continuity and processing stability. It is difficult to meet the needs of high-precision, large-volume bushing production, which seriously restricts product quality and production efficiency.

[0004] Therefore, the applicant proposes an outer frame and metal bushing for an automobile chassis and its injection molding equipment. Summary of the Invention

[0005] The purpose of this invention is to provide an outer frame and metal bushing for an automobile chassis and its injection molding equipment, to solve the following technical problems: In the prior art, after the bushing is injection molded, it is mostly dropped freely from a height without a linkage buffer support structure, which makes it very easy for the incompletely cured rubber bushing to be bumped and deformed, resulting in poor quality stability of the finished product, low yield, and poor automation of material feeding and production continuity.

[0006] The objective of this invention can be achieved through the following technical solutions: An outer frame and metal bushing for an automobile chassis and its injection molding equipment, including a worktable, a rotary disk rotatably mounted on the upper end of the worktable, a material feeding groove opened on one side of the top of the worktable, and a plurality of injection molding components arranged in a circular array on the upper end of the rotary disk. The workbench is provided with a material receiving assembly, which includes a rotating shaft disposed between the inner sidewalls of the material receiving trough. A telescopic sleeve is rotatably sleeved on the outer surface of the rotating shaft. A first connecting rod is provided at the upper end of the telescopic sleeve, and push rods are provided at both ends of the first connecting rod. A second connecting rod is provided at the lower end of the telescopic sleeve, and an L-shaped rod is provided at the end of the second connecting rod away from the telescopic sleeve. An arc-shaped feeding plate is rotatably arranged between the inner sidewalls of the feeding trough. A mounting base is slidably arranged at the lower end of the feeding trough. One end of the L-shaped rod is connected to the mounting base. A lifting rod is arranged on the mounting base. The end of the lifting rod away from the mounting base is slidably engaged with the lower end of the arc-shaped feeding plate.

[0007] As a further aspect of the present invention: the injection molding assembly includes a support frame disposed on the upper end of the worktable, and a bidirectional lead screw is rotatably disposed at the lower end of the support frame; Both ends of the bidirectional lead screw are threaded to mold bases, and each mold base has a mold cavity on its opposite side.

[0008] As a further aspect of the present invention: the upper end of the rotating disk is provided with a plurality of feeding ports in a circular array, and the upper end of the rotating disk and one side of the feeding ports are provided with a sliding groove. One of the mold bases has an L-shaped push plate at its lower end, and the L-shaped push plate and the push rod are at the same horizontal height.

[0009] As a further aspect of the present invention: a receiving groove is provided on the upper end of the rotary disk and on the side wall of multiple feeding ports, a receiving plate is slidably arranged in the receiving groove, and slots communicating with the sliding groove are provided on both sides of the receiving groove, and a slider is symmetrically arranged at one end of the receiving plate, the slider extending through the slot into the sliding groove.

[0010] As a further aspect of the present invention: a second shaft is slidably sleeved on one end of the receiving plate, extending from its inner side to its outer side; the end of the second shaft away from the receiving plate is connected to the side wall of the receiving groove. A second return spring is fitted onto the surface of the second shaft and between the side wall of the receiving groove and the receiving plate.

[0011] As a further aspect of the present invention: a top rod is slidably provided from the lower end of the arc-shaped feeding plate to its upper end, and a buffer plate is rotatably provided on the upper surface of the arc-shaped feeding plate via a rotating shaft; The upper end of the top rod extends to the upper end of the arc-shaped feeding plate and connects to the bottom end of the buffer plate.

[0012] As a further aspect of the present invention: a third reset spring is sleeved on the outer surface of the push rod and disposed between the lower end of the arc-shaped feeding plate and the lower end limiting ring of the push rod.

[0013] As a further aspect of the present invention: a first shaft is provided on one side of each of the two mold bases extending into the mold cavity, a limit ring is provided at one end of the first shaft, and a demolding top block is provided at the other end of the first shaft within the mold cavity.

[0014] As a further aspect of the present invention: a first return spring is sleeved on the outer surface of the first shaft, one end of the first return spring is fixedly connected to the outer wall of the mold base, and the other end of the first return spring is fixedly connected to the end limiting ring of the first shaft.

[0015] An outer frame and metal bushing for an automobile chassis, using the above-mentioned injection molding equipment, includes a metal inner bushing, the outer wall of which is provided with a rubber elastomer; The rubber elastomer is provided with a metal frame around its periphery.

[0016] The beneficial effects of this invention are: (1) The present invention sets up a linkage buffer feeding and receiving structure, which relies on the linkage of the mold opening action to drive the push rod, connecting rod and lifting rod to move together, automatically adjust the receiving angle and height of the arc-shaped feeding plate, and achieve flexible feeding with the buffer plate and multiple sets of reset springs, effectively shortening the drop difference of the incompletely cured bushing, buffering the impact force of the workpiece falling, and completely solving the problem of bushing deformation and collision damage caused by high-altitude material dropping in traditional equipment, significantly improving the yield of finished products and production stability; (3) The present invention optimizes the composite structure of metal rubber bushing. A combination structure of hollow groove and reinforcing rib is set inside the rubber elastomer. The hollow groove can flexibly adjust the overall stiffness of the bushing to meet the vibration reduction requirements of complex working conditions of automobile chassis. The reinforcing rib can also make up for the loss of structural strength and reduce the stress concentration phenomenon of rubber. It effectively takes into account the bushing's vibration reduction flexibility, load-bearing strength and fatigue durability, and greatly improves the operating stability and service life of the chassis suspension system. (3) The present invention sets up a multi-station rotary injection molding structure, which drives multiple injection molding components to alternate stations intermittently through a rotating disk, and completes the injection, pressure holding, cooling and unloading processes in sequence, thereby realizing continuous cyclic processing of bushing workpieces. It abandons the traditional single-station intermittent production mode, greatly improves the automation level and overall production efficiency of bushing injection molding, and can meet the needs of large-scale production.

[0017] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] The invention will now be further described with reference to the accompanying drawings.

[0019] Figure 1 This is a three-dimensional structural schematic diagram of the injection molding equipment of the present invention; Figure 2 This is a schematic diagram of the structure of the present invention; Figure 3 This is a schematic diagram of the overall structure of the rotating disk and several injection molding components of the present invention; Figure 4 This is a schematic diagram of the injection molding component of the present invention; Figure 5 This is a schematic diagram of the structure of the material receiving component of the present invention; Figure 6 This is a schematic diagram of the structure of the first part of the material receiving component of the present invention; Figure 7 This is a schematic diagram of the structure of the second part of the material receiving component of the present invention; Figure 8 This is a structural schematic diagram of the receiving plate, receiving groove, and second reset spring of the present invention; Figure 9 This is a structural schematic diagram of the product formed by the outer frame and metal bushing of the present invention.

[0020] In the diagram: 101, workbench; 102, rotary table; 103, material discharge chute; 201. Support frame; 202. Double-acting lead screw; 203. Mold base; 204. Mold cavity; 205. First shaft; 206. Ejector block; 207. First return spring; 301. Rotating shaft; 302. Telescopic sleeve rod; 303. First connecting rod; 304. Push rod; 305. Second connecting rod; 306. L-shaped rod; 307. Sliding groove; 308. Lifting rod; 309. Arc-shaped discharge plate; 310. Discharge port; 311. Sliding groove; 312. L-shaped push plate; 313. Receiving plate; 314. Sliding block; 315. Second shaft; 316. Second return spring; 317. Push rod; 318. Buffer plate; 319. Third return spring; 320. Fourth return spring 401. Metal inner liner; 402. Rubber elastomer; 403. Metal outer frame; 404. Hollowed-out groove; 405. Reinforcing rib. Detailed Implementation

[0021] Embodiments of the present invention are described in detail below. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar symbols denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0022] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0023] Example 1 Please see Figure 9 As shown, an outer frame and metal bushing for an automobile chassis includes a metal inner bushing 401, a rubber elastomer 402 on the outer wall of the metal inner bushing 401, a metal outer frame 403 on the outer periphery of the rubber elastomer 402, and a plurality of hollow grooves 404 spaced apart circumferentially inside the rubber elastomer 402. Reinforcing ribs 405 are integrally formed between adjacent hollow grooves 404.

[0024] The hollowed-out groove 404 allows for flexible adjustment of the equivalent stiffness of the rubber elastomer 402, adapting to the vibration reduction requirements of the chassis under different working conditions and effectively filtering vibration impacts transmitted from the road surface. The reinforcing rib 405, as the main force transmission carrier, bears radial and torsional loads, compensating for the structural strength loss caused by the hollowed-out groove 404, reducing the risk of stress concentration in the rubber elastomer 402, and improving the overall load-bearing capacity and fatigue durability while ensuring the bushing's vibration reduction flexibility.

[0025] Example 2 Based on Example 1, please refer to Figure 1 As shown, the injection molding equipment includes a worktable 101. A rotary disk 102 is rotatably mounted on the upper end of the worktable 101 via an intermittent rotating assembly. A material discharge chute 103 is provided on one side of the top of the worktable 101, and a conveying assembly can be installed at the lower end of the material discharge chute 103.

[0026] The conveying assembly can be a flat belt conveyor mechanism. The conveying assembly receives the injection-molded outer frame and metal bushing molded parts unloaded from the unloading chute 103. It relies on the drive roller to drive the ring belt to run continuously at low speed. The friction between the belt and the molded parts drives the molded parts to be transported out smoothly and slowly, avoiding the molded parts from falling and impacting and causing collision damage.

[0027] The conveying assembly can also use a roller conveyor mechanism, which relies on multiple sets of parallel rotating rollers to carry the formed parts and achieve continuous conveying of the workpieces through the rotation of the rollers; or a chain conveyor mechanism, which relies on a chain to drive the carrier to transfer the formed parts, suitable for the transfer of heavy bushing formed parts.

[0028] The intermittent rotation component consists of a drive disc and a grooved wheel. The motor drives the drive disc to rotate continuously and drives the grooved wheel to complete intermittent indexing rotation. The grooved wheel drives the rotating disc 102 to perform intermittent rotation and pause at a fixed angle, so that the injection molding components on the rotating disc 102 can switch positions in turn.

[0029] Preferably, please refer to Figures 1-3 As shown, a plurality of injection molding components are arranged in a ring array at the upper end of the rotary disk 102. The injection molding components include a support frame 201 set at the upper end of the worktable 101. A bidirectional lead screw 202 is rotatably set at the lower end of the support frame 201. One end of the bidirectional lead screw 202 extends to the other side of the support frame 201 and is driven to rotate by a sprocket, chain and motor. Both ends of the bidirectional lead screw 202 are threadedly connected to mold bases 203. Mold cavities 204 are opened on the opposite surfaces of the two mold bases 203. A first shaft 205 is set in the mold cavity 204 on one side of each of the two mold bases 203. A limit ring is set at one end of the first shaft 205. A demolding block 206 is set at the other end of the first shaft 205 and in the mold cavity 204. A first return spring 207 is sleeved on the outer surface of the first shaft 205. One end of the first return spring 207 is connected to the outer wall of the mold base 203 and the other end is connected to the limit ring.

[0030] The motor drives the bidirectional lead screw 202 to rotate via a sprocket and chain, causing the two mold bases 203 on both sides to close together to achieve mold closing. After the rubber injection molding is completed, the bidirectional lead screw 202 reverses to drive the mold base 203 to open the mold. The first shaft 205 contacts the side wall of the support frame 201. The first return spring 207 pulls the limit ring and the first shaft 205, together with the demolding top block 206, to push out the molding bushing to achieve automatic demolding.

[0031] An injection molding machine is installed on one side of the workbench 101. The injection molding machine injects rubber raw material into the mold cavity 204 after the mold is closed through the injection hole. The material is vulcanized and formed in the mold cavity 204 to obtain the bushing workpiece.

[0032] Multiple injection molding components are intermittently indexed and rotated by the rotary table 102, sequentially switching to the injection station, pressure holding and shaping station, cooling station, and unloading station. At the injection station, raw material is injected into the mold cavity 204 via the injection molding machine to complete the mold filling and injection molding of the outer frame and metal bushing. The workpiece first flows to the pressure holding and shaping station, where existing technology is used to continuously maintain the internal pressure of the mold cavity 204, compensating for melt cooling shrinkage, eliminating shrinkage defects in the product, and achieving pressure holding and shaping. Subsequently, the workpiece is transferred to the cooling station, where existing water-cooling or air-cooling heat exchange methods are used to remove heat from the workpiece and accelerate product solidification. Finally, it flows to the unloading station to complete the workpiece unloading. Both pressure holding and cooling utilize existing technologies.

[0033] Example 3 Based on Examples 1 and 2, please refer to Figure 4 , Figure 5 As shown, a material receiving assembly is provided on the workbench 101. The material receiving assembly includes a rotating shaft 301 disposed between the inner sidewalls of the material receiving groove 103 of the workbench 101. A telescopic sleeve 302 is rotatably sleeved on the outer surface of the rotating shaft 301. A first connecting rod 303 is provided at the upper end of the telescopic sleeve 302. Push rods 304 are provided at both ends of the first connecting rod 303. A second connecting rod 305 is provided at the lower end of the telescopic sleeve 302. The end of the second connecting rod 305 away from the telescopic sleeve 302 passes through the sidewall of the material receiving groove 103. A fixed plate extends to the other side and is connected to an L-shaped rod 306. A sliding groove 307 is provided at the lower end of the feeding trough 103. A mounting seat is slidably arranged in the sliding groove 307. One end of the L-shaped rod 306 away from the second connecting rod 305 is connected to the mounting seat. A lifting rod 308 is provided on the mounting seat. A fourth return spring 320 is sleeved on the outer surface of the second connecting rod 305. One end of the fourth return spring 320 is connected to the fixed plate on the side wall of the feeding trough 103, and the other end is connected to the ring on the outer surface of the second connecting rod 305.

[0034] Preferably, please refer to Figure 4 As shown, an arc-shaped feeding plate 309 is rotatably arranged between the inner sidewalls of the feeding trough 103. The arc-shaped feeding plate 309 can rotate around the upper pivot. The end of the lifting rod 308 away from the mounting seat is slidably engaged with the lower end of the arc-shaped feeding plate 309.

[0035] The upper end of the rotating disk 102 has a ring array of multiple discharge ports 310. The upper end of the rotating disk 102 and one side of the discharge port 310 have a sliding groove 311. One of the mold bases 203 has an L-shaped push plate 312 at its lower end. The L-shaped push plate 312 and the push rod 304 are at the same horizontal height.

[0036] During the mold opening process, the L-shaped push plate 312 at the lower end of the mold base 203 pushes the push rod 304, which drives the telescopic sleeve rod 302 to swing around the rotating shaft 301. Through the second connecting rod 305 and the L-shaped rod 306, the mounting base and the lifting rod 308 are driven to lift the arc-shaped blanking plate 309 to the receiving position, shortening the falling height of the molded part and preventing the bushing molded part, which has not been completely solidified, from deforming due to the impact of the drop. After the mold opening is completed, all linkage components are reset, and the arc-shaped blanking plate 309 tilts to transport the molded part downward.

[0037] Preferably, please refer to Figure 6 , Figure 7 As shown, a receiving groove is provided on the upper end of the rotary disk 102 and on the side wall of multiple feeding ports 310. A receiving plate 313 is slidably arranged in the receiving groove. Slots connected to the sliding groove 311 are provided on both sides of the receiving groove. A slider 314 is symmetrically arranged on one end of the receiving plate 313. The slider 314 extends through the slot into the sliding groove 311.

[0038] One end of the receiving plate 313 extends inward to its outer end and is slidably sleeved with a second shaft 315. The end of the second shaft 315 away from the receiving plate 313 is connected to the side wall of the receiving groove. A second return spring 316 is sleeved on the surface of the second shaft 315. One end of the second return spring 316 is connected to the receiving plate 313, and the other end is connected to the side wall of the receiving groove.

[0039] During the mold opening process, the mold base 203 drives the L-shaped push plate 312 to move backward, and the bushing molded part is demolded first and falls onto the receiving plate 313. The L-shaped push plate 312 continues to move backward and abuts against the sliding block 314, causing the receiving plate 313 to slide along the second shaft 315 and compress the second return spring 316, so that the receiving plate 313 opens the discharge port 310. The molded part slides down through the discharge port 310 to the arc-shaped discharge plate 309 to complete the discharge. When the L-shaped push plate 312 disengages from the sliding block 314, the second return spring 316 rebounds and resets, driving the receiving plate 313 and the sliding block 314 to return to their positions and block the discharge port 310 for cyclic operation.

[0040] Preferably, please refer to Figure 8 As shown, a push rod 317 is slidably mounted on the lower end of the arc-shaped feed plate 309 and its upper end. A buffer plate 318 is rotatably mounted on the upper surface of the arc-shaped feed plate 309 via a rotating shaft. The upper end of the push rod 317 extends to the upper end of the arc-shaped feed plate 309 and is connected to the bottom end of the buffer plate 318. A third return spring 319 is sleeved on the outer surface of the push rod 317. The upper end of the third return spring 319 is connected to the lower end of the arc-shaped feed plate 309, and the lower end is connected to the limiting ring at the lower end of the push rod 317.

[0041] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. An injection molding machine for an outer frame and metal bushing for an automobile chassis, characterized in that, Includes a workbench (101), a rotating disk (102) is rotatably provided on the upper end of the workbench (101), a material discharge groove (103) is provided on one side of the top of the workbench (101), and multiple injection molding components are arranged in a ring array on the upper end of the rotating disk (102). The workbench (101) is provided with a material receiving assembly. The material receiving assembly includes a rotating shaft (301) disposed between the inner sidewalls of the material receiving groove (103). A telescopic sleeve (302) is rotatably sleeved on the outer surface of the rotating shaft (301). A first connecting rod (303) is provided at the upper end of the telescopic sleeve (302). Push rods (304) are provided at both ends of the first connecting rod (303). A second connecting rod (305) is provided at the lower end of the telescopic sleeve (302). An L-shaped rod (306) is provided at the end of the second connecting rod (305) away from the telescopic sleeve (302). An arc-shaped feeding plate (309) is rotatably arranged between the inner sidewalls of the feeding trough (103). A mounting seat is slidably arranged at the lower end of the feeding trough (103). One end of the L-shaped rod (306) is connected to the mounting seat. A lifting rod (308) is arranged on the mounting seat. The end of the lifting rod (308) away from the mounting seat is slidably engaged with the lower end of the arc-shaped feeding plate (309).

2. The injection molding equipment for an outer frame and metal bushing for an automobile chassis according to claim 1, characterized in that, The injection molding assembly includes a support frame (201) disposed on the upper end of the worktable (101), and a bidirectional lead screw (202) is rotatably disposed on the lower end of the support frame (201). Both ends of the bidirectional lead screw (202) are threadedly connected to a mold base (203), and the opposite surfaces of the mold base (203) are provided with mold cavities (204).

3. The injection molding equipment for an outer frame and metal bushing for an automobile chassis according to claim 2, characterized in that, The upper end of the rotating disk (102) has a ring array of multiple discharge ports (310), and the upper end of the rotating disk (102) and one side of the discharge ports (310) have a groove (311). One of the mold bases (203) has an L-shaped push plate (312) at its lower end, and the L-shaped push plate (312) and the push rod (304) are at the same horizontal height.

4. The injection molding equipment for an outer frame and metal bushing for an automobile chassis according to claim 1, characterized in that, The upper end of the rotary disk (102) and the side wall of the multiple discharge ports (310) are provided with receiving grooves. A receiving plate (313) is slidably arranged in the receiving groove. The two sides of the receiving groove are provided with slots that communicate with the slide groove (311). A slider (314) is symmetrically arranged at one end of the receiving plate (313). The slider (314) extends through the slot into the slide groove (311).

5. The injection molding equipment for an outer frame and metal bushing for an automobile chassis according to claim 4, characterized in that, The receiving plate (313) extends from its inner side to its outer side and is slidably sleeved with a second shaft (315). The end of the second shaft (315) away from the receiving plate (313) is connected to the side wall of the receiving groove. A second return spring (316) is sleeved on the surface of the second shaft (315) and between the side wall of the receiving groove and the receiving plate (313).

6. The injection molding equipment for an outer frame and metal bushing for an automobile chassis according to claim 1, characterized in that, The lower end of the arc-shaped feed plate (309) extends to its upper end and is slidably provided with a top rod (317). The upper surface of the arc-shaped feed plate (309) is provided with a buffer plate (318) through a rotating shaft. The upper end of the top rod (317) extends to the upper end of the arc-shaped feed plate (309) and is connected to the bottom end of the buffer plate (318).

7. The injection molding equipment for an outer frame and metal bushing for an automobile chassis according to claim 6, characterized in that, A third return spring (319) is sleeved on the outer surface of the top rod (317) and is located between the lower end of the arc-shaped feed plate (309) and the lower end limiting ring of the top rod (317).

8. The injection molding equipment for an outer frame and metal bushing for an automobile chassis according to claim 2, characterized in that, One side of each of the two mold bases (203) extends into the mold cavity (204) and is provided with a first shaft (205). One end of the first shaft (205) is provided with a limit ring, and the other end of the first shaft (205) is provided with a demolding top block (206) in the mold cavity (204).

9. The injection molding equipment for an outer frame and metal bushing for an automobile chassis according to claim 8, characterized in that, A first return spring (207) is sleeved on the outer surface of the first shaft (205). One end of the first return spring (207) is fixedly connected to the outer wall of the mold base (203), and the other end of the first return spring (207) is fixedly connected to the end limiting ring of the first shaft (205).

10. An outer frame and metal bushing for an automobile chassis, using the injection molding equipment described in any one of claims 1-9, characterized in that, Includes a metal inner sleeve (401), the outer wall of which is provided with a rubber elastomer (402). The outer periphery of the rubber elastomer (402) is provided with a metal frame (403).

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