Hydraulic clutch booster

Abstract

The utility model provides hydraulic clutch booster belongs to mechanical technical field. It has solved the problem of the external volume of existing hydraulic booster is big and is not favorable to cooperation installation. The hydraulic clutch booster, including cylinder body, push rod and piston, the piston will the cylinder body inner chamber separate out oil outlet chamber, oil return chamber and oil inlet chamber in proper order, is provided with the oil passage on the piston, the push rod includes the rod body of being rod -shaped and the sleeve of being barrel -shaped, the recessed hole is provided with in the end of the rod body, the outer side of the inner end of sleeve is set in the rod body, and the axial location is realized through a bolt between both, the side of push rod is provided with radial hole in sleeve and rod body sleeve joint place, the port of the inner end of sleeve is always linked with the oil return, spring and valve core are arranged in the sleeve, the valve core is in the spring and is blocked between radial hole and sleeve inner end port under the action of the elasticity of spring and abuts on the rod body. The hydraulic clutch booster has the advantage that installation is convenient.

Description

Technical Field

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

[0002] Existing hydraulic clutch boosters generally include a cylinder, a piston housed within the cylinder, and a push rod at the outer end for connection to the vehicle's pedal. The piston divides the cylinder into an inlet chamber, a return chamber, and an outlet chamber, and also has an oil passage connecting the inlet and return chambers. In operation, the push rod is pushed into the cylinder to block the oil passage, and an external oil supply device continuously supplies oil to the inlet chamber. The piston is moved by the assistance of hydraulic pressure, reducing the difficulty of operation.

[0003] For example, the applicant designed a hydraulic power-assisted cylinder and applied for a Chinese patent with application number 201821990147.X and publication number CN209340259U. The hydraulic power-assisted cylinder includes a cylinder body with an oil inlet and an oil outlet. A valve body is also fixedly connected to the outside of the cylinder body between the oil inlet and the oil outlet. The valve body has an inlet end connected to the oil inlet, an outlet end connected to the oil outlet, and an overflow channel that connects the inlet end and the outlet end. The valve body is also provided with an overflow component, a spring seat, and a spring disposed between the overflow component and the spring seat. The overflow component can block the overflow channel under the elastic force of the spring. The spring seat can move closer to or further away from the overflow component in the valve body and can be positioned by a limiting component that is integral with or separate from the spring seat after the spring seat moves. The hydraulic power cylinder has an overflow valve structure installed outside the cylinder body to release oil when the oil pressure in the oil inlet chamber is too high, thus ensuring the service life of the hydraulic power cylinder.

[0004] However, this structural design makes the external volume of the cylinder block larger than that of a regular cylinder block, which is not conducive to installation with other existing components. Utility Model Content

[0005] The purpose of this invention is to address the aforementioned problems in the existing technology by proposing a hydraulic clutch booster, which solves the problem that the large external volume of existing hydraulic boosters makes them difficult to install.

[0006] The objective of this utility model can be achieved through the following technical solutions: A hydraulic clutch booster includes a cylinder with an oil inlet and an oil return port, a rod-shaped push rod, and a piston disposed within the cylinder. The piston sequentially divides the inner cavity of the cylinder into an oil outlet chamber, an oil return chamber communicating with the oil return port, and an oil inlet chamber communicating with the oil inlet port. An oil passage is provided on the piston connecting the oil inlet chamber and the oil return chamber. When the push rod moves into the cylinder, it can block the oil passage. The push rod comprises a rod-shaped rod body and a cylindrical sleeve, with the inner end of the rod body extending into the cylinder. The cylinder body and the end of the rod body have a recessed hole. The outer end of the sleeve is fitted onto the outer side of the inner end of the rod body, and the two are axially limited by a pin. The push rod is located on the side where the sleeve and the rod body are fitted together and has a radial hole that always connects the oil inlet and the recessed hole. The port of the inner end of the sleeve is always connected to the oil return port. The sleeve is equipped with a spring and a valve core. The valve core abuts against the rod body under the elastic force of the spring and blocks the radial hole and the port of the inner end of the sleeve.

[0007] During normal use, this hydraulic clutch booster moves the push rod inward, blocking the oil passage and increasing the oil pressure in the inlet chamber. The piston, aided by this oil pressure, moves towards the outlet chamber, pushing the oil out to achieve braking. When too much oil enters the inlet chamber through the inlet port, causing excessive oil pressure, the pressure acts on the valve core through the radial hole and concave hole, causing the valve core to overcome the spring force and open the concave hole. The oil in the inlet chamber can then drain sequentially along the radial hole, concave hole, sleeve inner hole, and return port, reducing the oil pressure on the inlet side and preventing the hydraulic clutch booster and external oil supply equipment from being under high pressure for extended periods, which could affect their service life. Furthermore, this hydraulic clutch booster places the valve core and spring inside the push rod, allowing the cylinder body's external volume to remain consistent with a standard cylinder body, facilitating installation. The sleeve and rod are connected by a pin, simplifying the insertion of the valve core and spring, as well as the connection between the sleeve and rod, making assembly more convenient.

[0008] In the aforementioned hydraulic clutch booster, the inner wall of the sleeve has a protruding, annular shoulder. The inner end of the rod abuts against the shoulder. A radially penetrating hole is formed on the side of the inner end of the push rod. The pin is inserted into the hole of the push rod, and the pin and the hole are in a clearance fit. The gap between the pin and the hole, coupled with the fact that the inner end of the rod abuts against the shoulder, allows the pin to connect the sleeve and the rod while preventing the push rod from relying solely on the pin to transmit force during inward movement, thus avoiding excessive force and bending of the pin.

[0009] In the aforementioned hydraulic clutch booster, the radial holes and the insertion holes are staggered, and their axes are perpendicular to each other. Because the radial holes and insertion holes are misaligned and not directly connected, the insertion hole itself can also serve to allow oil to flow into the recessed hole, increasing the flow rate during oil discharge and improving discharge efficiency.

[0010] In the aforementioned hydraulic clutch booster, a sealing ring forms a seal between the outer side of the inner end of the rod and the inner wall of the sleeve. The inner side of the inner end of the rod has a protruding, annular shoulder. Both the radial hole and the insertion hole are located on the inner wall of the shoulder, and the valve core can abut against the shoulder. The seal between the rod and the sleeve allows oil to leak only from the concave hole and the inner hole of the sleeve. The shoulder not only enhances the strength of the rod after the radial hole and insertion hole are created but also provides abutment for the opening and closing of the valve core.

[0011] In the aforementioned hydraulic clutch booster, a circular retaining ring is fixed to the piston. The retaining ring is sleeved on the outside of the rod body and abuts against the outer end face of the sleeve. The retaining ring provides radial outward restraint to the sleeve and the push rod as a whole, preventing the push rod from dislodging from the cylinder body.

[0012] In the aforementioned hydraulic clutch booster, the piston is further provided with a one-way channel connecting the return oil chamber and the outlet oil chamber. A one-way valve is installed within this one-way channel to allow oil to flow unidirectionally from the return oil chamber to the outlet oil chamber. This one-way valve allows oil pressure to rise in the return oil chamber and then leak into the outlet oil chamber.

[0013] Compared with existing technologies, this hydraulic clutch booster places the valve core and spring inside the push rod, so that the external volume of the cylinder body can be kept consistent with that of a regular cylinder body, which facilitates the adaptation and installation. The sleeve and rod body are connected by a pin, which facilitates the installation of the valve core and spring, and also facilitates the connection between the sleeve and rod body, making assembly more convenient. Attached Figure Description

[0014] Figure 1 This is a cross-sectional structural diagram of the hydraulic clutch booster.

[0015] In the diagram, 1. Cylinder block; 1a. Oil inlet; 1b. Oil return port; 1c. Oil outlet chamber; 1d. Oil return chamber; 1e. Oil inlet chamber; 2. Push rod; 2a. Rod body; 2b. Sleeve; 2c. Concave hole; 2d. Radial hole; 2e. Shoulder; 2f. Insertion hole; 2g. Raised shoulder; 3. Piston; 3a. Oil passage; 4. Pin; 5. Spring; 6. Valve core; 7. Sealing ring; 8. Snap ring; 9. Check valve. Detailed Implementation

[0016] 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.

[0017] like Figure 1 As shown, this hydraulic clutch booster includes a cylinder 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 cylinder 1. The piston 3 sequentially divides the inner cavity of the cylinder 1 into an oil outlet chamber 1c, an oil return chamber 1d communicating with the oil return port 1b, and an oil inlet chamber 1e communicating with the oil inlet port 1a. An oil passage 3a is provided on the piston 3, connecting the oil inlet chamber 1e and the oil return chamber 1d. When the push rod 2 moves into the cylinder 1, it can block the oil passage 3a.

[0018] The push rod 2 includes a rod-shaped body 2a and a cylindrical sleeve 2b. For ease of explanation, the left end shown in the attached figure is considered the inner end, and the right end is considered the outer end.

[0019] The inner end of rod 2a extends into cylinder 1, and a recessed hole 2c is provided at the end of the inner end of rod 2a. A protruding, annular shoulder 2g is provided on the side wall of the recessed hole 2c. An annular sealing ring 7 is fixed to the outer side of the inner end of rod 2a. The outer end of sleeve 2b is fitted onto the outer side of the inner end of rod 2a, and a seal is formed between the inner wall of sleeve 2b and the outer wall of rod 2a by the sealing ring 7. The port of the inner end of sleeve 2b is always connected to the oil return port 1b. The inner side of the inner end of sleeve 2b has a protruding, annular shoulder 2e and a flange, respectively. The shoulder 2e and the flange are arranged adjacent to each other, with the flange closer to the inner end of sleeve 2b than the shoulder 2e. A through-hole 2f is provided on the side of the inner end of the push rod 2. The through-hole 2f passes through the sleeve 2b and the rod 2a in sequence and is located on the inner wall of the shoulder 2g. A round rod-shaped pin 4 passes through the through-hole 2f to axially limit the sleeve 2b and the rod 2a. The pin 4 and the through-hole 2f are clearance-fitted, that is, the diameter of the through-hole 2f is larger than the diameter of the pin 4, and there is a gap between the inner wall of the through-hole 2f and the outer surface of the pin 4. In this embodiment, a radial hole 2d is also provided on the side of the push rod 2 at the junction of the sleeve 2b and the rod 2a. The radial hole 2d is always connected to the oil inlet 1a and the concave hole 2c. The radial hole 2d also passes through the sleeve 2b and the rod 2a and is located on the inner wall of the shoulder 2g. The radial hole 2d and the through-hole 2f are staggered at 90 degrees, and the through-hole 2f is closer to the inner end of the rod 2a than the radial hole 2d.

[0020] A spring 5 and a spherical valve core 6 are installed inside the sleeve 2b. One end of the spring 5 abuts against the retaining edge, and the other end abuts against the valve core 6. Under the elastic force of the spring 5, the valve core 6 extends into the concave hole 2c and abuts against the shoulder 2g port at the inner end of the rod body 2a, thereby blocking the connection between the radial hole 2d and the inner end port of the sleeve 2b. Here, the diameter of the valve core 6 is smaller than the diameter of the concave hole 2c, leaving an oil passage gap between the outer side of the valve core 6 and the wall of the concave hole 2c.

[0021] In addition, the piston 3 has an annular groove, and an annular retaining ring 8 is installed in the groove. The retaining ring 8 is sleeved on the outside of the rod 2a, and the inner side of the retaining ring 8 extends out of the groove and abuts against the outer end face of the sleeve 2b. The piston 3 also has a one-way channel connecting the return oil chamber 1d and the outlet oil chamber 1c. A one-way valve 9 is installed in the one-way channel to allow oil to flow unidirectionally from the return oil chamber 1d to the outlet oil chamber 1c.

[0022] When this hydraulic clutch booster is in normal use, the push rod 2 moves inward and abuts against the piston 3, blocking the oil passage 3a. As oil continuously enters through the oil inlet 1a, the oil pressure in the oil inlet chamber 1e continues to rise. Under the assistance of the oil pressure, the piston 3 moves towards the oil outlet chamber 1c, pushing out the oil to achieve braking.

[0023] When too much oil enters the inlet chamber 1e through the inlet port 1a, causing excessive oil pressure, the oil pressure acts on the valve core 6 through the radial hole 2d and the concave hole 2c, causing the valve core 6 to move against the elastic force of the spring 5, thus opening the concave hole 2c. The oil in the inlet chamber 1e can then be discharged sequentially along the radial hole 2d, the concave hole 2c, the inner hole of the sleeve 2b, and the return port 1b, reducing the oil pressure on one side of the inlet chamber 1e and preventing the hydraulic clutch booster and external oil supply equipment from being under high pressure for a long time, which would affect their service life.

[0024] 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 clutch booster, comprising a cylinder (1) having an oil inlet (1a) and an oil return port (1b), a rod-shaped push rod (2), and a piston (3) disposed within the cylinder (1), wherein the piston (3) sequentially divides the inner cavity of the cylinder (1) into an oil outlet chamber (1c), an oil return chamber (1d) communicating with the oil return port (1b), and an oil inlet chamber (1e) communicating with the oil inlet (1a), wherein the piston (3) has an oil passage (3a) communicating with the oil inlet chamber (1e) and the oil return chamber (1d), and wherein the push rod (2) can block the oil passage (3a) when it moves into the cylinder (1), characterized in that, The push rod (2) includes a rod-shaped rod body (2a) and a cylindrical sleeve (2b). The inner end of the rod body (2a) extends into the cylinder body (1), and a recess (2c) is provided at the end of the inner end of the rod body (2a). The outer end of the sleeve (2b) is fitted onto the outer side of the inner end of the rod body (2a), and the two are axially limited by a pin (4). The push rod (2) is located between the sleeve (2b) and the rod body (2a). The side of the joint is provided with a radial hole (2d) that is always connected to the oil inlet (1a) and the concave hole (2c). The inner end of the sleeve (2b) is always connected to the oil return port (1b). A spring (5) and a valve core (6) are provided inside the sleeve (2b). The valve core (6) abuts against the rod (2a) under the elastic force of the spring (5) and blocks the connection between the radial hole (2d) and the inner end of the sleeve (2b).

2. The hydraulic clutch booster according to claim 1, characterized in that, The inner wall of the sleeve (2b) has a protruding annular shoulder (2e), the inner end of the rod (2a) can abut against the shoulder (2e), the side of the inner end of the push rod (2) is radially provided with a insertion hole (2f), the pin (4) is inserted into the insertion hole (2f) of the push rod (2), and the pin (4) and the insertion hole (2f) are clearance fit.

3. The hydraulic clutch booster according to claim 2, characterized in that, The radial holes (2d) and the insertion holes (2f) are staggered and their axes are perpendicular to each other.

4. The hydraulic clutch booster according to claim 3, characterized in that, A seal is formed between the outer side of the inner end of the rod (2a) and the inner wall of the sleeve (2b) by a sealing ring (7). The inner side of the inner end of the rod (2a) has a protruding annular shoulder (2g). The radial hole (2d) and the insertion hole (2f) are both opened at the inner wall of the shoulder (2g). The valve core (6) can abut against the shoulder (2g).

5. The hydraulic clutch booster according to any one of claims 1 to 4, characterized in that, The piston (3) is fixed with a ring-shaped retaining ring (8), which is sleeved on the outside of the rod (2a) and can abut against the outer end face of the sleeve (2b).

6. The hydraulic clutch booster according to any one of claims 1 to 4, characterized in that, The piston (3) is also provided with a one-way channel connecting the return oil chamber (1d) and the outlet oil chamber (1c). The one-way channel is provided with a one-way valve (9) that enables the oil to flow unidirectionally from the return oil chamber (1d) to the outlet oil chamber (1c).

Images