Hydraulic booster device

Abstract

This utility model provides a hydraulic power assist device, belonging to the field of mechanical technology. It solves the problem of inconvenient replacement of existing brake pumps. This hydraulic power assist device includes a pump body with an oil inlet and an oil return port, a push rod, and a piston disposed within the pump body. The piston divides the pump body cavity into an oil inlet chamber and an oil return chamber. An oil passage is provided on the piston connecting the oil inlet and return chambers. The hydraulic power assist device also includes an overflow valve that allows one-way oil discharge from the oil inlet to the oil return port. A recessed connecting cavity is located on the other side of the pump body. The other end of the piston relative to the push rod is a connecting end. A circular seal is provided between the outer side of the connecting end and the inner wall of the pump body, and this seal maintains a constant seal between the piston and the pump body. The end of the connecting end passes through the seal and extends into the connecting cavity. This hydraulic power assist device has the advantage of convenient replacement.

Description

Technical Field

[0001] This utility model belongs to the field of mechanical technology and relates to a hydraulic power assist device. Background Technology

[0002] With the continuous development of the motor vehicle industry, vehicle usage is constantly increasing, and people's requirements for vehicle comfort and safety are also constantly rising. The clutch and braking system of a vehicle plays a very important role in the process of vehicle use, and the brake pump is a device used to assist in the operation of the vehicle's braking system.

[0003] Currently, a brake pump generally includes a pump body, a piston housed within the pump body, and a push rod at the outer end for connection with the vehicle pedal. The piston can divide the pump body into an inlet chamber and a return chamber. The pump body has an inlet port and a return port that are respectively connected to the inlet chamber and the return chamber. The piston also has an oil passage that connects the inlet chamber and the return chamber. The inner end of the push rod extends into the pump body, and when the push rod moves inward, the inner end of the push rod can block the oil passage.

[0004] However, different usage requirements necessitate different specifications of brake pumps. Since existing brake pumps are all complete integrated structures, if a different brake pump needs to be replaced, all oil lines must be blocked and the entire brake pump must be removed for replacement. This not only results in higher replacement costs but also greater inconvenience. Utility Model Content

[0005] The purpose of this invention is to address the aforementioned problems in the existing technology by proposing a hydraulic power assist device that solves the problem of inconvenient replacement of existing brake pumps.

[0006] The objective of this utility model can be achieved through the following technical solutions:

[0007] A hydraulic power assist device includes a pump body with an oil inlet and an oil return port, a push rod, and a piston disposed within the pump body. One end of the push rod enters the pump body from one side. The piston divides the internal cavity of the pump body into an oil inlet chamber communicating with the oil inlet and an oil return chamber communicating with the oil return port. An oil passage is provided on the piston to connect the oil inlet chamber and the oil return chamber. When the push rod moves into the pump body, it can block the oil passage. The hydraulic power assist device also includes an overflow valve that allows oil to drain from the oil inlet to the oil return port in one direction. The device is characterized in that the other side of the pump body has a recessed connecting cavity. The other end of the piston relative to the push rod is a connecting end. An annular seal is provided between the outer side of the connecting end and the inner wall of the pump body, and the seal keeps the piston and the pump body sealed at all times. The end of the connecting end passes through the seal and extends into the connecting cavity.

[0008] During installation, the connecting cavity of the pump body should be aligned with the force input position of the braking or clutch system, and the connecting end of the piston should be fixedly or movably connected to the input component of the braking or clutch system. In operation, the push rod moves into the pump body, blocking the oil passage, allowing oil to continuously enter through the inlet. The oil pressure in the inlet cavity continuously increases, pushing the piston towards the connecting cavity, i.e., the connecting end extends towards the connecting cavity, thus moving the input component of the braking or clutch system and driving it to perform the corresponding operation. When the oil pressure in the inlet cavity is too high, the overflow valve can be opened to release pressure towards the return port under the action of oil pressure. After operation, the push rod no longer blocks the oil passage, and the oil in the inlet cavity flows out through the oil passage from the return port, restoring the oil pressure on both sides of the piston to equilibrium, allowing the piston to return to its original position.

[0009] In this hydraulic power assist device, the seal is different from the one-way seal of the piston cup. Instead, it keeps the piston and pump body sealed at all times. This blocks the oil passage between the connecting chamber and the return oil chamber, making them independent of each other. That is, there is no oil in the connecting chamber, which allows this hydraulic power assist device to be mechanically connected to the braking system or clutch system as a hydraulic power assist component. Even if the hydraulic power assist device needs to be replaced, there is no need to consider the oil passage interruption or sealing at the connection point, making replacement more convenient.

[0010] In the aforementioned hydraulic power assist device, the pump body has an inwardly protruding, annular shoulder. The connecting cavity and the return oil cavity are located on opposite sides of the shoulder, respectively. The connecting end passes through the shoulder, and the seal is positioned between the inner side of the shoulder and the outer side of the connecting end. The shoulder design reduces the diameter, facilitating the insertion of the connecting end and ensuring proper sealing.

[0011] In the aforementioned hydraulic power assist device, the shoulder has an annular protrusion at one end facing the return oil chamber. An annular groove is formed between the outer side of the protrusion and the inner wall of the pump body. A return spring, sleeved on the outside of the piston, is also installed inside the return oil chamber. One end of the return spring abuts against the bottom of the groove, and the other end abuts against the piston. The annular protrusion at one end of the shoulder serves two purposes: extending the axial length of the shoulder and improving the stability of the guide and seal at the connection end; and forming a groove on the outer side of the protrusion to limit the movement of one end of the return spring.

[0012] In the aforementioned hydraulic power assist device, the number of seals is at least two and they are distributed along the axial direction of the shoulder. Multiple seals achieve multiple seals, improving the sealing effect and facilitating connection at the joint ends.

[0013] In the aforementioned hydraulic power steering device, a connection gap exists between the outer side of the connecting end and the sidewall of the connecting cavity, and the end face of the connecting end is an arc-shaped surface. The presence of the connection gap allows the braking system or clutch system portion to be embedded within the pump body and connected to the connecting end, resulting in a more compact overall structure and a more stable connection.

[0014] In the aforementioned hydraulic power assist device, the pump body has an overflow hole connecting the oil inlet and the oil return port, and the overflow valve is located within the overflow hole. Positioning the overflow valve on the pump body avoids interference with other structures and facilitates maintenance.

[0015] In another scenario, in the aforementioned hydraulic power assist device, one end of the push rod has an overflow hole two that connects the oil inlet chamber and the oil return chamber, and the overflow valve is located within the overflow hole two. The overflow valve being mounted on the push rod makes the overall structure more compact and reduces the space occupied.

[0016] Compared with existing technologies, the seal in this hydraulic power-assisted device is different from the one-way seal of the piston cup. Instead, it keeps the piston and pump body sealed at all times, thus blocking the oil passage between the connecting cavity and the return oil cavity. The two are independent of each other, meaning there is no oil in the connecting cavity. This allows the hydraulic power-assisted device to be mechanically connected to the braking system or clutch system as a hydraulic power-assisted component. Even if the hydraulic power-assisted device needs to be replaced, there is no need to consider issues such as oil passage interruption or sealing at the connection point, making replacement more convenient. Attached Figure Description

[0017] Figure 1 This is a cross-sectional structural schematic diagram of Embodiment 1 of the hydraulic power assist device.

[0018] Figure 2 This is a schematic diagram of the overflow valve in Embodiment 1 of this hydraulic power assist device.

[0019] Figure 3 This is a cross-sectional structural schematic diagram of Embodiment 2 of the hydraulic power assist device.

[0020] In the diagram, 1. Pump body; 1a. Oil inlet; 1b. Oil return port; 1c. Oil inlet chamber; 1d. Oil return chamber; 1e. Connecting chamber; 1f. Shoulder; 1g. Protrusion; 1h. Groove; 1i. Overflow hole one; 2. Push rod; 2a. Overflow hole two; 3. Piston; 3a. Oil passage; 3b. Connecting end; 4. Overflow valve; 5. Seal; 6. Return spring. Detailed Implementation

[0021] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments. Example 1

[0022] like Figure 1As shown, this hydraulic power assist device includes a pump body 1 with an oil inlet 1a and an oil return port 1b, a rod-shaped push rod 2, and a piston 3 disposed within the pump body 1. One end of the push rod 2 enters the pump body 1 from one side. The piston 3 divides the inner cavity of the pump body 1 into an oil inlet chamber 1c connected to the oil inlet 1a and an oil return chamber 1d connected to the oil return port 1b. An oil passage 3a is provided on the piston 3, connecting the oil inlet chamber 1c and the oil return chamber 1d. When the push rod 2 moves into the pump body 1, one end of the push rod 2 can block the oil passage 3a. A spring is provided between the push rod 2 and the piston 3 to return the push rod 2 to its original position. A return spring 6 is provided in the oil return chamber 1d, sleeved on the outside of the piston 3. The return spring 6 can cause the piston 3 to move into the oil return chamber 1d and then return to its original position. Here, the specific structure and opening of the oil passage 3a are existing technologies and will not be described in detail.

[0023] The pump body 1 has a recessed connecting cavity 1e on the side opposite to the push rod 2, and the piston 3 has a connecting end 3b at the other end opposite to the push rod 2. The pump body 1 has an inwardly protruding, annular shoulder 1f. The connecting cavity 1e and the return oil cavity 1d are located on opposite sides of the shoulder 1f. The connecting end 3b passes through the inner hole of the shoulder 1f. Several annular seals 5 are provided between the inner side of the shoulder 1f and the outer side of the connecting end 3b. The end of the shoulder 1f facing the return oil cavity 1d has a protruding, annular convex part 1g. The inner surface of the convex part 1g is flush with the inner surface of the shoulder 1f, and the outer side of the convex part 1g forms an annular groove 1h between it and the inner wall of the pump body 1. One end of the return spring 6 abuts against the bottom of the groove 1h, and the other end abuts against the piston 3. In this embodiment, the inner walls of the shoulder 1f and the protrusion 1g are both provided with annular sealing grooves. The sealing element 5 is respectively disposed in the two sealing grooves and extends out of the sealing grooves, and abuts against the outer wall of the connecting end 3b of the piston 3. There is a connection gap between the outer side of the connecting end 3b and the side wall of the connecting cavity 1e, and the end face of the connecting end 3b is an arc-shaped surface.

[0024] like Figure 2 As shown, the pump body 1 also has a protruding overflow section on its outer side. An overflow hole 1i is provided within this overflow section, connecting the oil inlet 1a and the oil return port 1b. An overflow valve 4 is disposed within the overflow hole 1i. Here, the overflow valve 4 is an existing component; a check valve can be selected as needed.

[0025] When installing this hydraulic power assist device, align the connecting cavity 1e of the pump body 1 with the force input position of the braking system or clutch system, and fix or movably connect the connecting end 3b of the piston 3 to the input component of the braking system or clutch system.

[0026] When in use, push rod 2 moves into pump body 1, blocking oil passage 3a, and oil continuously enters at oil inlet 1a. The oil pressure in oil inlet chamber 1c continuously increases, pushing piston 3 to move towards connecting chamber 1e, that is, connecting end 3b extends towards connecting chamber 1e, to push the input component in braking system or clutch system to move, thereby driving braking system or clutch system to perform corresponding work.

[0027] When the oil pressure in the inlet chamber 1c is too high, the overflow valve 4 can be opened under the action of oil pressure to release pressure towards the return port 1b. After the operation is completed, the spring causes the push rod 2 to move outward and reset. The push rod 2 no longer blocks the oil passage 3a, and the oil in the inlet chamber 1c flows out through the oil passage 3a from the return port 1b. The oil pressure on both sides of the piston 3 is restored to balance, and the piston 3 can be reset under the elastic force of the reset spring 6. Example 2

[0028] like Figure 3 As shown, the technical solution of this embodiment is largely the same as that of Embodiment 1, except that: one end of the push rod 2 is provided with an overflow hole 2a that connects the oil inlet chamber 1c and the oil return chamber 1d, and the overflow valve 4 is disposed in the overflow hole 2a. Specifically, the inner end of the push rod 2 is provided with an axial hole that communicates with the oil return chamber 1d along the axial direction, and a radial hole that communicates with the oil inlet chamber 1c along the radial direction. The axial hole and the radial hole are connected, and the ports of the axial hole and the radial hole on the outer side of the push rod 2 are respectively located on both sides of the sealing position where the push rod 2 abuts against the piston 3 when it moves inward. The overflow valve 4 is disposed in the axial hole.

[0029] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A hydraulic power assist device, comprising a pump body (1) having an oil inlet (1a) and an oil return port (1b), a push rod (2), and a piston (3) disposed within the pump body (1), wherein one end of the push rod (2) extends into the pump body (1) from one side of the pump body (1), the piston (3) divides the inner cavity of the pump body (1) into an oil inlet chamber (1c) communicating with the oil inlet (1a) and an oil return chamber (1d) communicating with the oil return port (1b), the piston (3) having an oil passage (3a) connecting the oil inlet chamber (1c) and the oil return chamber (1d), the push rod (2) being able to block the oil passage (3a) when the push rod (2) moves into the pump body (1), the hydraulic power assist device further comprising an overflow valve (4) capable of unidirectionally discharging oil from the oil inlet (1a) to the oil return port (1b), characterized in that, The pump body (1) has a recessed connecting cavity (1e) on the other side. The piston (3) is connected at the other end relative to the push rod (2) as a connecting end (3b). A circular sealing element (5) is provided between the outer side of the connecting end (3b) and the inner wall of the pump body (1), and the sealing element (5) keeps the piston (3) and the pump body (1) sealed at all times. The end of the connecting end (3b) passes through the sealing element (5) and extends into the connecting cavity (1e).

2. The hydraulic power assist device according to claim 1, characterized in that, The pump body (1) has an inwardly protruding annular shoulder (1f), the connecting cavity (1e) and the return oil cavity (1d) are located on both sides of the shoulder (1f), the connecting end (3b) passes through the shoulder (1f), and the sealing element (5) is disposed between the inner side of the shoulder (1f) and the outer side of the connecting end (3b).

3. The hydraulic power assist device according to claim 2, characterized in that, The shoulder (1f) has a protruding annular protrusion (1g) at one end facing the oil return chamber (1d). An annular groove (1h) is formed between the outer side of the protrusion (1g) and the inner wall of the pump body (1). A return spring (6) is also provided in the oil return chamber (1d) and sleeved on the outside of the piston (3). One end of the return spring (6) abuts against the bottom of the groove (1h) and the other end abuts against the piston (3).

4. The hydraulic power assist device according to claim 2 or 3, characterized in that, The number of the seals (5) is at least two and they are distributed along the axial direction of the shoulder (1f).

5. The hydraulic power assist device according to claim 1, 2, or 3, characterized in that, There is a connection gap between the outer side of the connecting end (3b) and the side wall of the connecting cavity (1e), and the end face of the connecting end (3b) is an arc-shaped surface.

6. The hydraulic power assist device according to claim 1, 2, or 3, characterized in that, The pump body (1) is provided with an overflow hole (1i) that connects the oil inlet (1a) and the oil return port (1b), and the overflow valve (4) is located inside the overflow hole (1i).

7. The hydraulic power assist device according to claim 1, 2, or 3, characterized in that, The push rod (2) has an overflow hole (2a) at one end that connects the oil inlet chamber (1c) and the oil return chamber (1d), and the overflow valve (4) is located in the overflow hole (2a).

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