Vacuum booster assembly with limit dust cover

Abstract

This utility model relates to a vacuum booster assembly with a limiting dust cover, belonging to the field of vacuum booster assemblies in automotive braking system technology. It includes a front housing, a diaphragm, a rear housing riveting component, a locking plate, a dust cover, a rear housing air seal, a valve body component, a control valve component, a pressure block, a feedback disc, a retaining ring, a master cylinder push rod, and a return spring. The limiting plate is mounted on the valve stem of the control valve component, with a transition fit. The mounting port of the dust cover is fitted into the annular groove of the limiting plate. The advantage is its novel structure. By adding a limiting plate to the valve stem of the control valve component, the position of the dust cover is limited. When the valve stem moves back and forth, the dust cover moves accordingly, preventing friction and noise between the dust cover and the valve stem at low temperatures. This meets customer requirements and can be used in different types of 11-inch, 10-inch, and 9-inch through-type vacuum booster assemblies, satisfying OEM requirements.

Description

Technical Field

[0001] This utility model belongs to the field of vacuum booster assembly in automotive braking system technology, specifically relating to a vacuum booster assembly with a limiting dust cover. Background Technology

[0002] The existing conventional vacuum booster assembly mainly consists of the following parts: front housing 1, diaphragm 2, rear housing riveting component 3, locking plate 4, dust cover 5, rear housing air seal 6, valve body component 7, control valve component 8, pressure block 9, feedback disc 10, retaining ring 11, main cylinder push rod 12, and return spring 13. See also Figure 5 The original vacuum booster assembly, after assembly, received feedback from the OEM that it made noise at low temperatures, which was reported as a customer complaint. Analysis revealed that during booster operation, the valve stem moved back and forth without the dust cover having a limit stop. Because the dust cover material is EPDM, it hardens at low temperatures. As the valve stem moves back and forth, the dust cover rubs against the valve stem, generating noise. Summary of the Invention

[0003] This utility model provides a vacuum booster assembly with a limiting dust cover to solve the problem of noise generated by the back-and-forth friction between the dust cover and the valve stem during the operation of the vacuum booster, which affects the user experience.

[0004] The technical solution adopted by this utility model is as follows: it includes a front shell, a diaphragm, a rear shell riveting component, a locking plate, a dust cover, a rear shell air seal, a valve body component, a control valve component, a pressure block, a feedback disc, a protective ring, a master cylinder push rod, and a return spring. The limiting plate is assembled on the valve stem of the control valve component and transitionally fits with the valve stem. The mounting port of the dust cover is assembled into the annular groove of the limiting plate.

[0005] The thickness at the mounting port of the dust cover is greater than the thickness of the dust cover body.

[0006] The limiting piece has an annular groove on its circumference.

[0007] The limiting piece is made of plastic.

[0008] The control valve component includes an air valve seat, a rubber valve component, a rubber valve spring, a rubber valve seat, a valve stem return spring, a valve stem spring seat, a foam filter element, a felt filter element, and a valve stem. The valve stem has a limiting boss on the outside of the felt filter element, and a limiting plate is assembled between the felt filter element and the limiting boss.

[0009] The air valve seat, rubber valve component, rubber valve seat, valve stem spring seat, foam filter element, and felt filter element are respectively sleeved on the outside of the valve stem. The rubber valve spring is located in the rubber valve component and the rubber valve seat. The valve stem return spring is sleeved on the outside of the valve stem and located in the rubber valve seat.

[0010] The front housing, diaphragm, rear housing riveting components, and valve body components are riveted together. The rear housing air seal is installed outside the valve body components, the control valve components are installed inside the valve body components, the locking plate is snapped onto the valve body components, the pressure block is installed at the front end of the control valve components, the feedback disc is installed at the rear of the master cylinder push rod, the protective ring is sleeved on the rear of the master cylinder push rod, and the return spring is sleeved on the outside of the master cylinder push rod.

[0011] The advantages of this utility model are its novel structure. The added limiting plate is assembled on the valve stem of the control valve component to limit the position of the dust cover. When the valve stem moves back and forth, the dust cover moves with it, preventing the dust cover from rubbing against the valve stem and generating noise at low temperatures. While ensuring that the 10-inch through-type vacuum booster assembly has smaller redesigned parts, the dust cover will not rub against the valve stem and generate noise during the booster's operation, thus meeting customer requirements. This utility model can also be used on different types of 11-inch, 10-inch, and 9-inch through-type vacuum booster assemblies to meet the requirements of OEMs. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the structure of the dust cover, limiting plate and valve stem of this utility model; Figure 3 This is a schematic diagram of the structure of the limiting piece of this utility model; Figure 4 This is a structural schematic diagram of the control valve component of this utility model; Figure 5 This is a structural schematic diagram of an existing vacuum booster assembly. Detailed Implementation

[0013] It includes a front housing 1, a diaphragm 2, a rear housing riveting component 3, a locking plate 4, a dust cover 5, a rear housing air seal 6, a valve body component 7, a control valve component 8, a pressure block 9, a feedback disc 10, a protective ring 11, a master cylinder push rod 12, and a return spring 13. The limiting plate 14 is assembled on the valve stem 809 of the control valve component 8 and transitionally fits with the valve stem. The mounting port 501 of the dust cover 5 is assembled into the annular groove 1401 of the limiting plate 14.

[0014] The thickness of the dust cover 5 at the mounting port 501 is greater than the thickness of the dust cover body 502.

[0015] The limiting piece 14 has an annular groove 1401 on its circumference.

[0016] The limiting piece 14 is made of plastic.

[0017] The control valve component 8 includes an air valve seat 801, a rubber valve component 802, a rubber valve spring 803, a rubber valve seat 804, a valve stem return spring 805, a valve stem spring seat 806, a foam filter element 807, a felt filter element 808, and a valve stem 809. The valve stem 809 has a limiting boss 80901 on the outside of the felt filter element 808, and a limiting piece 14 is assembled between the felt filter element 808 and the limiting boss 80901.

[0018] The air valve seat 801, rubber valve component 802, rubber valve seat 804, valve stem spring seat 806, foam filter element 807, and felt filter element 808 are respectively sleeved on the outside of the valve stem 809. The rubber valve spring 803 is located in the rubber valve component 802 and the rubber valve seat 804. The valve stem return spring 805 is sleeved on the outside of the valve stem 809 and located in the rubber valve seat 804.

[0019] The front housing 1, diaphragm 2, rear housing riveting component 3 and valve body component 7 are riveted together. The rear housing air seal 6 is installed outside the valve body component 7. The control valve component 8 is installed inside the valve body component 7. The locking plate 4 is snapped onto the valve body component 7. The pressure block 9 is installed at the front end of the control valve component 8. The feedback disc 10 is installed at the rear of the master cylinder push rod 12. The protective ring 11 is sleeved on the rear of the master cylinder push rod 12. The return spring 13 is sleeved on the outside of the master cylinder push rod 12.

[0020] Working principle This utility model adds a limiting plate 14 to the original 10-inch through-type vacuum booster assembly. The dust cover 5 is assembled in the groove 1401 of the limiting plate to limit the dust cover. When the valve rod moves back and forth, the dust cover also moves with it, which can prevent the noise generated by the friction between the two during the operation of the vacuum booster at low temperature.

Claims

1. A vacuum booster assembly with a limiting dust cover, comprising a front housing, a diaphragm, a rear housing riveting component, a locking plate, a dust cover, a rear housing air seal, a valve body component, a control valve component, a pressure block, a feedback disc, a retaining ring, a master cylinder push rod, and a return spring, characterized in that: The limit plate is mounted on the valve stem of the control valve component and transitions with the valve stem. The mounting port of the dust cover is mounted into the annular groove of the limit plate.

2. The vacuum booster assembly with a limiting dust cover according to claim 1, characterized in that: The thickness at the mounting port of the dust cover is greater than the thickness of the dust cover body.

3. The vacuum booster assembly with a limiting dust cover according to claim 1, characterized in that: The limiting piece has an annular groove on its circumference.

4. A vacuum booster assembly with a limiting dust cover according to claim 1 or 3, characterized in that: The limiting piece is made of plastic.

5. A vacuum booster assembly with a limiting dust cover according to claim 1, wherein the control valve component includes an air valve seat, a rubber valve component, a rubber valve spring, a rubber valve seat, a valve stem return spring, a valve stem spring seat, a foam filter element, a felt filter element, and a valve stem, characterized in that: The valve stem has a limiting boss on the outside of the felt filter element, and a limiting plate is assembled between the felt filter element and the limiting boss.

6. A vacuum booster assembly with a limiting dust cover according to claim 5, characterized in that: The air valve seat, rubber valve component, rubber valve seat, valve stem spring seat, foam filter element, and felt filter element are respectively sleeved on the outside of the valve stem. The rubber valve spring is located in the rubber valve component and the rubber valve seat. The valve stem return spring is sleeved on the outside of the valve stem and located in the rubber valve seat.

7. A vacuum booster assembly with a limiting dust cover according to claim 1, characterized in that: The front housing, diaphragm, rear housing riveting components, and valve body components are riveted together. The rear housing air seal is installed outside the valve body components, the control valve components are installed inside the valve body components, the locking plate is snapped onto the valve body components, the pressure block is installed at the front end of the control valve components, the feedback disc is installed at the rear of the master cylinder push rod, the protective ring is sleeved on the rear of the master cylinder push rod, and the return spring is sleeved on the outside of the master cylinder push rod.

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