Vacuumizing device for pre-assembly of front shell and rear shell of vacuum booster

Abstract

The utility model relates to a vacuumizing device for pre-assembling a front shell and a rear shell of a vacuum booster, and belongs to an auxiliary device used in the production process of the vacuum booster. The piston provided with the O-shaped ring is installed in the cylinder body, so that the piston is in sliding connection with the cylinder body, the lower portion of the piston is sleeved with the spring, the lower end of the spring is arranged on the spring seat, the spring seat is limited through the split washer, the split washer is installed in an annular groove of the cylinder body, the rubber suction cup is fixedly installed at the lower end of the piston, and the third O-shaped ring is installed on the cylinder cover. The cylinder cover is installed on the cylinder body through hexagon socket cap screws, the vacuum source quick-plug connector assembly is in threaded connection with the cylinder cover, and the positive pressure source quick-plug connector assembly is in threaded connection with the cylinder body. The device has the advantages that the structure is novel, the device is used for pre-assembling the front shell and the rear shell of the vacuum booster, the whole cavity of the booster is vacuumized from the central hole of the front shell through the device after the front shell and the rear shell are pressed, the booster cannot bounce off under the condition that pressure difference exists inside and outside the booster, and preparation is made for riveting the front shell and the rear shell of a product.

Description

Technical Field

[0001] The utility model belongs to an auxiliary device used in the production process of a vacuum booster, in particular to a vacuum pumping device used for pre-assembling the front and rear shells of the vacuum booster. Background Art

[0002] At present, there are pneumatic boosters, vacuum boosters, electric boosters, hydraulic boosters, etc. Among them, the vacuum booster assembly is a key component in the automobile braking system. Its main function is to amplify the servo force through the vacuum booster through the pedal force, act on the brake master cylinder, make it move forward to compress the brake fluid in the master cylinder, and then transmit hydraulic pressure to the brake system of the whole vehicle through the brake master cylinder oil outlet, so as to realize the braking function of the car.

[0003] Vacuum boosters can be roughly divided into two types based on the front and rear shell connection structure: through-type and non-through-type. The diaphragm is clamped between the two shells to form two sealed cavities. The vacuum pressure difference generated by the front and rear cavities generates pressure to increase the output force and achieve the boost effect. Figure 4 As shown, the front and rear shells of the vacuum booster are connected by riveting. The riveting of the vacuum booster with a non-through structure requires pre-assembly of the front and rear shells. Since the product has a return spring in the middle, there is a large resistance. After research, it is found that the front and rear shells need to be assembled together by vacuuming. The front and rear shells of the booster are both vacuumed. The external atmospheric pressure ensures that the front and rear shells will not separate due to the resistance of the return spring, so that subsequent riveting can be performed. However, there are many types of products in the current production process, resulting in different product heights, which makes the existing vacuuming device less versatile and requires manual material return, which brings inconvenience to production. Summary of the invention

[0004] The utility model provides a vacuum pumping device for pre-assembling front and rear shells of a vacuum booster, so as to solve the problems that the existing vacuum pumping device is insufficient in universality and requires manual material removal, thus bringing inconvenience to production.

[0005] The technical scheme adopted by the utility model is to include a rubber suction cup, an open retaining ring, a spring seat, a spring, an O-ring 1, a piston, a cylinder body, an O-ring 2, an O-ring 3, a cylinder cover, a hexagon socket head screw, a vacuum source quick-plug connector assembly and a positive pressure source quick-plug connector assembly, wherein the O-ring 1 and the O-ring 2 are installed on the piston, the piston is installed into the cylinder body, the piston and the cylinder body are slidably connected, the spring is sleeved on the lower part of the piston, the lower end of the spring is placed on the spring seat, the spring seat is limited by the open retaining ring, the open retaining ring is installed in the annular groove of the cylinder body, the rubber suction cup is fixedly installed at the lower end of the piston, the O-ring 3 is installed on the cylinder cover, the cylinder cover is installed on the cylinder body by the hexagon socket head screw, the vacuum source quick-plug connector assembly is threadedly connected to the cylinder cover, and the positive pressure source quick-plug connector assembly is threadedly connected to the cylinder body.

[0006] The rubber suction cup has a third vacuum extraction channel, and the piston has a second vacuum extraction channel, and the second vacuum extraction channel is connected to the third vacuum extraction channel.

[0007] The cylinder body has a piston limiting boss, which cooperates with the shoulder of the piston to limit the piston.

[0008] The cylinder body has a fixed flange below.

[0009] There is a gap between the bottom of the cylinder head and the top of the piston.

[0010] The cylinder head has a first vacuum extraction channel.

[0011] The advantages of the present utility model are novel structure, adopting a single-acting cylinder, with a through hole in the center of the piston, vacuumizing the product through the vacuum source interface at the cylinder head, having a spring mechanism inside to ensure that the piston can have a certain stroke of telescopic amount, being able to ensure reliable vacuum extraction according to the different heights of the product shell, being used for the pre-assembly of the front and rear shells of the vacuum booster. After the front and rear shells are pressed tightly, the whole cavity of the booster is vacuumized through the central hole of the front shell by this device. After reaching the set vacuum degree, the vacuum source is closed, and the booster is pushed out by ventilating through the positive pressure source joint. The booster will not bounce open when there is a pressure difference inside and outside, preparing for the riveting of the front and rear shells of the product, with reliable structure, low cost investment, and convenient adjustment. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 is a schematic structural diagram of the present utility model;

[0013] Figure 2 is Figure 1 the A-A cross-sectional view of

[0014] Figure 3 is the Figure 1 after rotating 90 degrees clockwise

[0015] Figure 4 is the state diagram after the pre-assembly of the front and rear shells of the vacuum booster;

[0016] Figure 5 is the schematic diagram of the use state of the present utility model, showing the connection with the front shell in the figure;

[0017] Figure 6 is the schematic diagram of the use state of the present utility model, showing the state after the pre-assembly of the front shell and the rear shell in the figure. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] Figure 1 、 Figure 2 、 Figure 3As shown in the figure, it includes a rubber suction cup 1, an open snap ring 2, a spring seat 3, a spring 4, an O-ring I 5, a piston 6, a cylinder block 7, an O-ring II 8, an O-ring III 9, a cylinder head 10, an M4 hexagon socket head cap screw 11, a vacuum source quick-connect fitting assembly 12, and a positive pressure source quick-connect fitting assembly 13. Among them, the O-ring I 5 and the O-ring II 8 are installed on the piston 6. After evenly applying grease on the inner wall of the cylinder block 7, the piston 6 is installed into the cylinder block 7 so that the piston 6 is slidably connected to the cylinder block 7. The spring 4 is sleeved on the lower part of the piston 6, and the lower end of the spring 4 is placed on the spring seat 3. The spring seat 3 is limited by the open snap ring 2, and the open snap ring 2 is installed in the annular groove of the cylinder block 7. The rubber suction cup 1 is fixedly installed at the lower end of the piston 6. The O-ring III 9 is installed on the cylinder head 10, and the cylinder head 10 is installed on the cylinder block 7 through the M4 hexagon socket head cap screw 11. The vacuum source quick-connect fitting assembly 12 is threadedly connected to the cylinder head 10, and the positive pressure source quick-connect fitting assembly 13 is threadedly connected to the cylinder block 7.

[0019] The rubber suction cup 1 has a vacuum pumping channel III 101, and there is a vacuum pumping channel II 601 in the piston 6. The vacuum pumping channel II 601 is communicated with the vacuum pumping channel III 101.

[0020] There is a gap between the bottom of the cylinder head 10 and the top of the piston 6.

[0021] There is a piston limiting boss 702 in the cylinder block 7, which cooperates with the shoulder 602 of the piston 6 to limit the piston 6.

[0022] There is a fixed flange 701 below the cylinder block 7.

[0023] There is a vacuum pumping channel I 1001 in the cylinder head 10.

[0024] Working principle

[0025] As Figure 5 shown, after the mouth of the front shell 14 of the vacuum booster is sealed with a one-way valve 15, it is placed in the front shell positioning tooling 16. There are four strong magnets 17 on the front shell positioning tooling 16 to adsorb the front shell plane to prevent the front shell from falling. The utility model is installed on the pressing device 18 of the front and rear shell assembling equipment through four through holes on the fixed flange 701 of the cylinder block;

[0026] As Figure 6 shown, after the pressing device 18 is pressed in place, it is ensured that the front shell 14 and the rear shell 19 are pre-assembled together to form a seal with the diaphragm. At the same time, the rubber suction cup 1 has contacted the one-way valve 15 when the front shell 14 is installed, and the piston 6 moves upward a certain distance. Since the self-weight of the piston 6 is greater than the resistance of the compression spring 3, it is ensured that there is a certain pressing force between the rubber suction cup 1 and the end face of the one-way valve 15 to form a seal;

[0027] Start evacuating through the quick-connect fitting assembly 12 of the vacuum source. The one-way valve 15 opens to discharge the atmosphere in the product cavity. After reaching the set vacuum degree, the vacuum is cut off. Introduce a certain positive pressure through the quick-connect fitting assembly 13 of the positive pressure source, causing the cylinder piston 6 to move downward as Figure 3 shown, separating the pre-assembled front and rear housings from the strong magnet 17 on the positioning tooling 16 to prevent the product from being lifted during the retraction of the downward pressing mechanism. After confirming that the pre-assembled front and rear housings have been separated, the downward pressing device 18 retracts to complete the pre-assembly of the front and rear housings of the product.

[0028] The spring mechanism therein ensures that the piston can have a certain stroke of telescopic amount, and can ensure reliable evacuation according to the different heights of the product housing. Due to the action of the one-way valve, the inside of the front and rear housings is vacuum and the outside is the atmosphere. Under the action of the internal and external pressure difference, the product will not separate the front and rear housings under the resistance of the internal return spring, and then the product is transferred to the next riveting process for riveting.

Claims

1. A vacuum pumping device for pre-assembling the front and rear housings of a vacuum booster, characterized in that: It includes a rubber suction cup, an open retaining ring, a spring seat, a spring, an O-ring 1, a piston, a cylinder body, an O-ring 2, an O-ring 3, a cylinder head, a hexagon socket cylindrical head screw, a vacuum source quick-plug connector assembly and a positive pressure source quick-plug connector assembly, wherein the O-ring 1 and the O-ring 2 are installed on the piston, the piston is installed in the cylinder body, the piston and the cylinder body are slidably connected, the spring is sleeved on the lower part of the piston, the lower end of the spring is placed on the spring seat, the spring seat is limited by the open retaining ring, the open retaining ring is installed in the annular groove of the cylinder body, the rubber suction cup is fixedly installed at the lower end of the piston, the O-ring 3 is installed on the cylinder head, the cylinder head is installed on the cylinder body by the hexagon socket cylindrical head screw, the vacuum source quick-plug connector assembly is threadedly connected to the cylinder head, and the positive pressure source quick-plug connector assembly is threadedly connected to the cylinder body.

2. A vacuum pumping device for pre-assembling the front and rear housings of a vacuum booster according to claim 1, characterized in that: The rubber suction cup is provided with a third vacuum channel, the piston is provided with a second vacuum channel, and the second vacuum channel is connected with the third vacuum channel.

3. A vacuum pumping device for pre-assembling the front and rear housings of a vacuum booster according to claim 1, characterized in that: The cylinder body is provided with a piston limiting boss which cooperates with the shoulder of the piston to limit the piston.

4. A vacuum pumping device for pre-assembling the front and rear housings of a vacuum booster according to claim 1, characterized in that: A fixing flange is arranged below the cylinder body.

5. A vacuum pumping device for pre-assembling front and rear housings of a vacuum booster according to claim 1, characterized in that: There is a gap between the bottom of the cylinder cover and the top of the piston.

6. A vacuum pumping device for pre-assembling the front and rear housings of a vacuum booster according to claim 1, characterized in that: A vacuum channel 1 is arranged in the cylinder cover.

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