Hydraulic bushing capable of effectively avoiding abnormal sound caused by flash of pressure release valve

Abstract

A hydraulic bushing capable of effectively avoiding abnormal sound caused by flash of a pressure release valve comprises a bushing body, the pressure release valve and a pressure release valve parting line, and the bushing body comprises an outer sleeve, an inner sleeve and a rubber main spring; the pressure release valve is connected with the rubber main spring; the pressure release valve parting line comprises a first section parting line, a second section parting line, a third section parting line, a fourth section parting line, a fifth section parting line, a sixth section parting line and a seventh section parting line which are connected in sequence; and the second parting line and the sixth parting line are respectively displaced by the middle lower end of the pressure release valve, so that abnormal sound generated by flashes of the parting lines of the pressure release valve and the outer sleeve is avoided. The second section of parting line and the sixth section of parting line are located at the position where the opening amplitude of the pressure release valve is large, and the parting line of the pressure release valve is located at the position of the lower middle end of the pressure release valve, so that the flash of the parting line of the pressure release valve is far away from the position where the pressure release valve and the outer sleeve are prone to generating relative displacement. The inner surface of the outer sleeve cannot be contacted, and the abnormal sound problem is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to vehicle chassis rubber metal damping part technical field especially, it is a kind of hydraulic bushing that effectively avoids due to pressure relief valve flash and leads to abnormal sound. BACKGROUND

[0002] Hydraulic bushing general structure contains: inner tube, outer tube, inner cage, rubber main spring, flow channel, damping liquid etc. Rubber main spring vulcanization will reserve two chambers, chamber interior is filled with damping liquid when assembling, simultaneously two chambers are communicated by flow channel. Bushing is connected vehicle body and swing arm by inner tube and outer tube respectively, when vehicle body and swing arm relatively move, one side chamber is extruded, chamber internal pressure increases, damping liquid passes through flow channel and enters another side chamber from extruded chamber. In order to guarantee the fatigue of hydraulic bushing, hydraulic bushing usually has the structure of pressure relief valve, and the pressure relief valve is in closed state when free state or amplitude frequency is relatively small. With the increase of amplitude and frequency, chamber internal pressure rises, when damping liquid is not enough to flow into another side from pressure side chamber quickly through flow channel, pressure relief valve will open and communicate two sides liquid chamber, assist the pressure balance of two liquid chambers, to reach the effect of improving product endurance.

[0003] But pressure relief valve in the process of opening and closing, its top will produce relative motion between outer sleeve, thereby there is the risk of producing friction abnormal sound. Moreover, by the limitation of vulcanization mold stripping mode, bypass valve is usually arranged at the junction of two vulcanization mold harver blocks, so that the mold parting line of vulcanization mold is usually near the top of bypass valve. And the mold parting line of vulcanization mold exists the risk of producing rubber flash. The position of rubber flash is near the top of bypass valve, and this place is the contact part with outer sleeve. Therefore, the risk of friction abnormal sound of bypass valve will sharply increase. If there is abnormal sound problem, fine repair of flash is needed in actual production, which will consume a large amount of manual working hours and reduce production efficiency.

[0004] The mold parting line position of existing pressure relief valve is usually near the top, and the length of flash needs to be controlled after the completion of bushing vulcanization, for example, if the length of flash is too large, it is difficult to avoid the contact between flash and outer tube in the movement process of pressure relief valve, thereby increasing the risk of abnormal sound.

[0005] Therefore, we propose a kind of hydraulic bushing that effectively avoids due to pressure relief valve flash and leads to abnormal sound. UTILITY MODEL CONTENTS

[0006] The applicant provides an effective hydraulic bushing capable of avoiding abnormal sound caused by flash of a pressure relief valve, a second section parting line and a sixth section parting line are located at a position where the pressure relief valve has a large opening range, the pressure relief valve parting line is located at a middle lower end of the pressure relief valve, the flash of the pressure relief valve parting line is far away from a position where the pressure relief valve and the outer sleeve are easy to have relative displacement, and in the process of opening and closing of the pressure relief valve, the inner surface of the outer sleeve is not contacted, so that the abnormal sound problem is avoided.

[0007] The technical scheme adopted by the utility model is as follows:

[0008] An effective hydraulic bushing capable of avoiding abnormal sound caused by flash of a pressure relief valve, comprising:

[0009] A bushing main body comprising an outer sleeve, an inner sleeve, a rubber main spring and an inner cage;

[0010] The pressure relief valve is a part of the rubber main spring and is assembled to the inner side of the outer sleeve;

[0011] The pressure relief valve parting line comprises a first section parting line, a second section parting line, a third section parting line, a fourth section parting line, a fifth section parting line, a sixth section parting line and a seventh section parting line which are sequentially connected;

[0012] The second section parting line and the sixth section parting line are located at a middle lower end of a pressure relief valve respectively, and abnormal sound caused by the flash of the parting line of the pressure relief valve and the outer sleeve in the working state of the pressure relief valve is avoided.

[0013] It is further characterized in that:

[0014] The rubber main spring connects the inner cage and the inner sleeve through vulcanization, and the pressure relief valve contacts the outer sleeve after the rubber main spring is assembled to the outer sleeve.

[0015] The second section parting line, the fourth section parting line and the sixth section parting line are arranged in parallel with the center line of the outer sleeve.

[0016] The first section parting line, the third section parting line, the fifth section parting line and the seventh section parting line are connected through inclined lines, and are kept at a certain distance from the built-in framework, so that the sharp height change between the die undercut position and the rubber main spring is reduced, and the risk of pulling the rubber main spring is reduced.

[0017] The utility model has the advantages that:

[0018] The utility model is compact and reasonable, the second section parting line and the sixth section parting line are located at a position where the pressure relief valve has a large opening range, the pressure relief valve parting line is located at a middle lower end of the pressure relief valve, the flash of the pressure relief valve parting line is far away from a position where the pressure relief valve and the outer sleeve are easy to have relative displacement, and in the process of opening and closing of the pressure relief valve, the inner surface of the outer sleeve is not contacted, so that the abnormal sound problem is avoided.

[0019] Meanwhile, the utility model still has the following advantages:

[0020] (1) The first section parting line, the third section parting line, the fifth section parting line and the seventh section parting line at the both sides and the middle position of the pressure relief valve adopt the oblique line transition connection, and keep a certain distance with the built-in framework at the same time, reduce the sharp height change between the die undercut position and the rubber main spring here, thereby reduce the risk of pulling the rubber main spring.

[0021] (2) The new pressure relief valve parting line can avoid the abnormal sound risk caused by the rubber main spring flash. It can reduce the flash trimming process in production, improve the production efficiency and save the production cost. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is the structure schematic diagram of the utility model.

[0023] Figure 2 It is Figure 1 It is the A-A section schematic diagram.

[0024] Figure 3 It is Figure 2 It is the B place enlarged schematic diagram.

[0025] Figure 4 It is the pressure relief valve parting line schematic diagram of the utility model.

[0026] Wherein: 1, bush body;101, outer sleeve;102, inner sleeve;103, rubber main spring;104, inner cage;2, pressure relief valve;3, pressure relief valve parting line;301, first section parting line;302, second section parting line;303, third section parting line;304, fourth section parting line;305, fifth section parting line;306, sixth section parting line;307, seventh section parting line. DETAILED DESCRIPTION

[0027] The specific implementation of the utility model is described below in conjunction with the drawings.

[0028] As Figures 1-4 shown, a hydraulic bushing effectively avoids abnormal sound caused by pressure relief valve flash, comprising bush body 1, pressure relief valve 2 and pressure relief valve parting line 3.

[0029] The bush body 1 includes outer sleeve 101, inner sleeve 102, rubber main spring 103 and inner cage 104, the rubber main spring 103 is connected with the inner cage 104 and the inner sleeve 102 by vulcanization, and the rubber main spring 103 is arranged in the outer sleeve 1. The pressure relief valve 2 is part of the rubber main spring 103, and is assembled inside the outer sleeve 101. After the rubber main spring 103 is assembled in the outer sleeve 101, the pressure relief valve 2 contacts the outer sleeve 101.

[0030] As Figure 4As shown, the pressure relief valve parting line 3 includes a first section parting line 301, a second section parting line 302, a third section parting line 303, a fourth section parting line 304, a fifth section parting line 305, a sixth section parting line 306, and a seventh section parting line 307.

[0031] The second section parting line 302, the fourth section parting line 304, and the sixth section parting line 306 are arranged in parallel with the center line of the sleeve 101.

[0032] The second section parting line 302 and the sixth section parting line 306 are located at a position where the pressure relief valve 2 has a large opening range. The movement of the pressure relief valve parting line 3 at this position to the lower end of the pressure relief valve 2 is facilitated. Thus, the flash of the pressure relief valve parting line 3 is away from the position where the pressure relief valve 2 is easily displaced relative to the sleeve 101. During the opening and closing of the pressure relief valve 2, the inner surface of the sleeve 101 is not contacted, thereby avoiding the problem of abnormal sound.

[0033] The downward movement of the pressure relief valve parting line 3 causes the mold to have a reverse buckle with the pressure relief valve 2 before demolding, thereby causing the risk of rubber damage. Therefore, the first section parting line 301, the third section parting line 303, the fifth section parting line 305, and the seventh section parting line 307 at the positions on both sides and in the middle of the pressure relief valve 2 are connected by diagonal lines, while maintaining a certain distance from the built-in skeleton. The sharp height change between the mold reverse buckle position and the rubber main spring 103 is reduced, thereby reducing the risk of rubber main spring 103 damage. The new pressure relief valve parting line 3 can avoid the abnormal sound risk caused by the flash of the rubber main spring 103. The process of repairing the flash in production can be reduced, the production efficiency is improved, and the production cost is saved.

[0034] The above description is an explanation of the present utility model, not a limitation of the utility model. The scope defined by the present utility model is referred to the claims. Within the protection scope of the present utility model, any form of modification can be made.

Claims

1. A hydraulic bushing that effectively avoids abnormal noise caused by flash of a pressure relief valve, characterized in that: include: The bushing body (1) comprises an outer sleeve (101), an inner sleeve (102), a rubber main spring (103) and an inner cage (104); The pressure relief valve (2) is a part of the rubber main spring (103) and is assembled to the inner side of the outer sleeve (101); The pressure relief valve parting line (3) comprises a first parting line (301), a second parting line (302), a third parting line (303), a fourth parting line (304), a fifth parting line (305), a sixth parting line (306) and a seventh parting line (307) connected in sequence; The second parting line (302) and the sixth parting line (306) are respectively located at the middle and lower ends of a pressure relief valve (2), so as to prevent the flash of the parting line (3) from sliding relative to the outer sleeve (101) and causing abnormal noise when the pressure relief valve is in working state.

2. A hydraulic bushing that effectively avoids abnormal noise caused by flash of a pressure relief valve according to claim 1, characterized in that: The rubber main spring (103) is connected to the inner cage (104) and the inner sleeve (102) by vulcanization. After the rubber main spring (103) is assembled with the outer sleeve (101), the pressure relief valve (2) contacts the outer sleeve (101).

3. A hydraulic bushing that effectively avoids abnormal noise caused by flash of a pressure relief valve as claimed in claim 2, characterized in that: The second parting line (302), the fourth parting line (304) and the sixth parting line (306) are arranged parallel to the center line of the outer shell (101).

4. A hydraulic bushing that effectively avoids abnormal noise caused by flash of a pressure relief valve as claimed in claim 3, characterized in that: The first parting line (301), the third parting line (303), the fifth parting line (305) and the seventh parting line (307) are connected by an oblique transition while maintaining a certain distance from the built-in skeleton, thereby reducing the sharp height change between the mold undercut position and the rubber main spring (103) and reducing the risk of damaging the rubber main spring (103).

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