Power head output force amplification structure for brake calipers

Abstract

The present invention discloses a power head output force amplification structure for a brake caliper. The structure comprises a caliper body, a piston, a separator ring, a screw and a screw sleeve. The piston is movably mounted in the cylinder hole of the caliper body of the brake caliper. The separator ring is located in the cylinder hole of the caliper body, and the cylinder hole of the caliper body is divided into an inner and outer cavity by the separator ring. A chamber is provided at one end of the piston, and the other end is installed in the chamber of the piston. The chamber of the piston also has a screw sleeve. The screw passes through the bottom of the cylinder hole of the caliper body from the outside and then extends into the inner cavity of the piston and is threadedly connected to the screw sleeve. The rotation of the screw drives the axial movement of the screw sleeve, thereby affecting the connection between the piston chamber and the inner and outer cavities of the cylinder hole, thereby driving the movement of the piston to control the output force amplification. The structure of the present invention can increase the output force of the power head, so that the brake caliper only needs a smaller power head output force to generate the amplified parking output force when parking, which has met the parking performance of the vehicle. The structure can increase the application range of the power head and extend the service life of the power head.

Description

Technical Field

[0001] The invention relates to a component of a vehicle braking system, in particular to an output force amplification structure of a power head for a brake caliper. Background Art

[0002] Existing electronic parking brakes all use a power head to directly push the piston. The sleeve input force and the piston output force are basically maintained at 1:1. The performance of the power head cannot cover heavier models, and the power head is overloaded, resulting in a short service life. Summary of the Invention

[0003] In order to address the problem that the power head cannot be used on heavier vehicles due to insufficient output force in actual use, or the power head has a short service life due to overload, the present invention proposes an output force amplification structure for a power head for a brake caliper, especially for use in the electronic parking brake in the automobile braking system.

[0004] The present invention adopts the following technical solutions to solve the problem:

[0005] The present invention includes a caliper body and a piston, wherein the piston is movably installed in the cylinder hole of the caliper body of the brake caliper, and further includes a separating ring, a screw and a screw sleeve; a separating ring is fixedly installed in the cylinder hole of the caliper body, and the cylinder hole of the caliper body is divided into an inner and outer cavity by the separating ring; a chamber is opened at one end of the piston close to the bottom of the cylinder hole of the caliper body, and the other end is installed in the chamber of the piston; at the same time, a screw sleeve is also installed in the chamber of the piston; the screw rod passes through the bottom of the cylinder hole of the caliper body from the outside and then extends into the inner cavity of the piston and is threadedly connected with the screw sleeve; the rotation of the screw rod drives the screw sleeve to move axially, thereby affecting the communication relationship between the piston chamber and the inner and outer cavities of the cylinder hole, thereby driving the movement of the piston to control the output force amplification.

[0006] The outer peripheral surface of the separating ring is sealed and connected to the inner wall of the piston chamber through the sealing leather cup A. One end of the screw sleeve extends into the through hole of the separating ring and is sealed and connected through the sealing leather cup B. The separating ring is provided with a circle of oil supply holes arranged at intervals along the circumferential direction. The oil supply holes are used to connect the inner and outer cavities of the cylinder hole; the screw sleeve is provided with an oil groove arranged along the axial direction, and the oil groove is used to connect the oil supply hole and the piston chamber.

[0007] The screw rod extends into the inner cavity of the piston and then into the through hole of the separation ring and is threadedly sleeved in the screw sleeve to form a threaded fit.

[0008] The other end of the screw sleeve extends into the piston chamber and is provided with an outer convex disc body. The outer convex disc body is restricted in the piston chamber and can only move axially but not rotate. The axial cross-sectional area of the outer convex disc body is smaller than the axial cross-sectional area of the piston chamber.

[0009] When the power head pushes the sleeve to move, the leather cup on the sleeve moves forward through the oil supply hole of the separation ring, dividing the brake caliper into two chambers. Since the pressure in the pressure-building chamber is the same everywhere, the hydraulic area of the sleeve is small and the hydraulic area of the piston is large. When the power head inputs force to the sleeve, the output force at the piston will be amplified proportionally.

[0010] The oil passage groove is arranged through the outer convex disc body.

[0011] An annular groove is provided on the outer peripheral surface of the screw sleeve, the annular groove is communicated with the oil groove, and a sealing leather cup B is installed in the annular groove.

[0012] An annular groove is provided on the outer peripheral surface of the separation ring or the inner wall surface of the piston chamber, and a sealing leather cup A is installed in the annular groove.

[0013] The screw rod is coaxially connected to the output shaft of the motor of the external power head.

[0014] Beneficial effects of the present invention:

[0015] The present invention adopts a hydraulic amplifier structure, the hydraulic contact area of the input force structure is small, and the hydraulic contact area of the output force mechanism is large, so that after the input force of the power head passes through the hydraulic mechanism, the piston output force is amplified. In this way, the parking output force can be increased under the same working conditions of the power head, and the vehicle model matching range of the power head can be expanded. At the same time, under the same vehicle model, the use load of the power head can be reduced, thereby extending the service life of the power head.

[0016] The structure of the present invention can increase the output force of the power head, so that the brake caliper only needs a smaller output force of the power head to generate an amplified parking output force when parking, which has met the parking performance of the vehicle. This structure can increase the application range of the power head. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the assembly structure of the present invention;

[0018] Figure 2 (a) is a cross-sectional view of the separator ring of the present invention;

[0019] Figure 2 (b) is a three-dimensional diagram of the separator ring of the present invention;

[0020] Figure 3 (a) is a cross-sectional view of the screw sleeve of the present invention;

[0021] Figure 3 (b) is a three-dimensional diagram of the screw sleeve of the present invention.

[0022] In the figure: 1. Clamp body, 2. Piston, 3. Separator ring, 4. Sleeve, 5. Screw, 6. Sealing cup B, 7. Sealing cup A, a. Oil filling hole, b. Oil groove. DETAILED DESCRIPTION

[0023] The present invention will be further described in detail below with reference to the accompanying drawings and specific implementations.

[0024] like Figure 1 As shown, the structure includes a caliper body 1, a piston 2, a separator ring 3, a screw 5 and a screw sleeve 4. The piston 2 is movably mounted in the cylinder bore of the caliper body 1 of the brake caliper. The piston 2 can move axially along the cylinder bore of the caliper body 1, moving toward or away from the brake disc and brake pad. A separator ring 3 is fixed in the cylinder bore of the caliper body 1, which divides the cylinder bore of the caliper body 1 into an inner and outer cavity. The piston 2 has a chamber at one end near the bottom of the cylinder bore of the caliper body 1. One end of the separator ring 3 is fixed to the bottom of the cylinder bore of the caliper body 1, and the other end is installed in the chamber of the piston 2. At the same time, a screw sleeve 4 is also installed in the chamber of the piston 2. The screw 5 passes through the bottom of the cylinder bore of the caliper body 1 from the outside and then extends into the inner cavity of the piston 2 and is threadedly connected to the screw sleeve 4. The rotation of the screw 5 drives the screw sleeve 4 to move axially, thereby affecting the communication relationship between the piston 2 chamber and the inner and outer cavities of the cylinder bore, thereby driving the movement of the piston 2 to control the output force amplification.

[0025] In the structure of the present invention, the axial movement of the screw sleeve 4 does not push the piston 2 to move, but pushes the piston 2 to move through the hydraulic pressure due to the change in the mutual pressure relationship of the chambers.

[0026] The outer circumference of the separator ring 3 is sealed with the inner wall of the piston 2 chamber through the sealing cup A7 for sealing with the piston 2. The end of the screw sleeve 4 close to the bottom of the cylinder hole of the caliper body 1 extends into the through hole of the separator ring 3 and is sealed by the sealing cup B6. The screw 5 extends into the inner cavity of the piston 2 and then into the through hole of the separator ring 3 and is threadedly fitted in the screw sleeve 4 to form a threaded fit. Figure 2 As shown, the separator ring 3 is provided with a circle of oil replenishing holes a arranged at intervals along the circumferential direction, as shown in FIG. Figure 3 As shown, the oil supply hole a is used to connect the inner and outer cavities of the cylinder hole; the screw sleeve 4 is provided with an oil groove b arranged along the axial direction, and the oil groove b is used to connect the oil supply hole a and the chamber of the piston 2.

[0027] The oil groove b provided on the outer ring of the screw sleeve and the oil replenishing hole a opened on the split ring 3 are combined to form an oil passage connecting the pressure building chamber and the oil replenishing chamber, ensuring the replenishment of the brake fluid in the pressure building chamber after the parking is released, and controlling the braking output force generated by the corresponding movement of the piston.

[0028] The other end of the screw sleeve 4 away from the bottom of the cylinder hole of the caliper body 1 extends into the chamber of the piston 2 and is provided with an outer convex disc body. The outer convex disc body and the screw sleeve 4 itself are integrated. The outer convex disc body is restricted in the chamber of the piston 2 and can only move axially but not rotate. The axial cross-sectional area of the outer convex disc body is smaller than the axial cross-sectional area of the chamber of the piston 2.

[0029] The oil groove b runs through the outer convex disc body. The sealing leather cup A7 is installed on the outer peripheral surface of the separation ring 3 and can also be installed on the inner peripheral surface of the piston 2.

[0030] The screw 5 is coaxially connected to the output shaft of the motor of the external power head. An annular groove is provided on the outer peripheral surface of the screw sleeve 4. The annular groove is connected to one end of the oil groove b. A sealing leather cup B6 is installed in the annular groove. The sealing leather cup B6 is used to seal with the separator ring 3.

[0031] An annular groove is provided on the outer peripheral surface of the separation ring 3 or the inner wall surface of the piston 2 chamber, and a sealing leather cup A7 is installed in the annular groove.

[0032] The working principle process of the present invention is:

[0033] When the parking brake is applied, the power head is energized, driving the motor, which, through gear transmission, drives the screw 5 in the brake caliper to rotate. Simultaneously, the screw sleeve 4 is limited by the caliper due to the relationship between the outer convex disc and the chamber of the piston 2. The rotation of the screw 5 drives the screw sleeve 4 forward in the axial direction toward the piston 2. As the screw sleeve 4 moves axially forward, the sealing cup B6 blocks the oil supply hole a through the oil supply hole a on the separator ring, completely separating the cylinder bore of the brake caliper into two independent inner and outer chambers. The inner chamber serves as a pressure-building chamber, and the outer chamber serves as an oil supply chamber.

[0034] Then, the screw sleeve 4 is driven by the rotation of the screw 5 to continue to move forward, and the pressure in the pressure-building chamber generates an increase in hydraulic pressure, that is, the force transmitted by the motor to the axial forward movement of the screw sleeve 4 is converted into an increase in hydraulic pressure in the pressure-building chamber. Since the pressure in the pressure-building chamber is equal everywhere, the piston 2 moves under the action of the hydraulic pressure in the pressure-building chamber, generating an output force to push the brake block on the front end face of the piston 2 to move, and then contact and rub with the brake disc, thereby generating braking force.

[0035] At the same time, in the pressure-building chamber, the hydraulic pressure also generates pressure on the separation ring 3. The separation ring 3 is fixedly connected to the caliper body 1 of the brake caliper, thereby pushing the caliper body 1 of the brake caliper to move backward. The caliper body 1 pushes the brake pad on the other side of the brake caliper, where the piston 2 is not installed, to move, and also contacts and rubs with the brake disc to generate braking force.

[0036] In the pressure-building chamber, since the axial contact area between the hydraulic pressure and the screw sleeve 4 is small, and the axial contact area between the hydraulic pressure and the piston 2 is large, when the input force of the screw sleeve 4 is converted into hydraulic pressure, and then converted into the output force of the piston 2, the input force of the screw sleeve 4 is amplified.

[0037] Therefore, the present invention adopts a hydraulic amplifier structure, the hydraulic contact area of the input force structure is small, and the hydraulic contact area of the output force mechanism is large, so that after the input force of the power head passes through the hydraulic mechanism, the piston output force is amplified. In this way, the parking output force can be increased under the same working conditions of the power head, and the vehicle model matching range of the power head can be expanded. At the same time, under the same vehicle model, the use load of the power head can be reduced, and the service life of the power head can be extended.

[0038] The above specific embodiments are used to illustrate the present invention rather than to limit the present invention. Any modifications and changes made to the present invention within the spirit of the present invention and the protection scope of the claims shall fall within the protection scope of the present invention.

Claims

1. A brake caliper power head output force amplification structure, comprising a caliper body (1) and a piston (2), wherein the piston (2) is movably mounted in a cylinder hole of the caliper body (1), and is characterized in that: It also includes a separating ring (3), a screw (5) and a screw sleeve (4); a separating ring (3) is fixed in the cylinder hole of the caliper body (1), and the cylinder hole of the caliper body (1) is divided into an inner and outer cavity by the separating ring (3); a chamber is opened at one end of the piston (2) near the bottom of the cylinder hole of the caliper body (1); one end of the separating ring (3) is fixed to the bottom of the cylinder hole of the caliper body (1), and the other end is installed in the chamber of the piston (2); at the same time, a screw sleeve (4) is also installed in the chamber of the piston (2); the screw (5) passes through the bottom of the cylinder hole of the caliper body (1) from the outside and then extends into the inner cavity of the piston (2) and is threadedly connected to the screw sleeve (4); the rotation of the screw (5) drives the screw sleeve (4) to move axially, thereby affecting the connection relationship between the piston (2) chamber and the inner and outer cavities of the cylinder hole, thereby driving the movement of the piston (2) to control the output force amplification; The outer peripheral surface of the separating ring (3) is sealed and connected to the inner wall of the piston (2) chamber via a sealing leather cup A (7); one end of the screw sleeve (4) extends into the through hole of the separating ring (3) and is sealed and connected via a sealing leather cup B (6); a circle of oil supply holes (a) arranged at intervals along the circumferential direction is provided on the separating ring (3); the oil supply holes (a) are used to connect the inner and outer cavities of the cylinder hole; the screw sleeve (4) is provided with an oil groove (b) arranged along the axial direction; the oil groove (b) is used to connect the oil supply hole (a) and the chamber of the piston (2); An annular groove is provided on the outer peripheral surface of the screw sleeve (4), the annular groove is connected to the oil groove (b), and a sealing leather cup B (6) is installed in the annular groove.

2. The output force amplification structure of a power head for a brake caliper according to claim 1, characterized in that: The screw (5) extends into the inner cavity of the piston (2) and then into the through hole of the separation ring (3) and is threadedly sleeved in the screw sleeve (4) to form a threaded fit.

3. The output force amplification structure of a power head for a brake caliper according to claim 1, characterized in that: The other end of the screw sleeve (4) extends into the chamber of the piston (2) and is provided with an outer convex disc body. The outer convex disc body is restricted in the chamber of the piston (2) and can only move axially but cannot rotate. The axial cross-sectional area of the outer convex disc body is smaller than the axial cross-sectional area of the chamber of the piston (2).

4. The output force amplification structure of a power head for a brake caliper according to claim 3, characterized in that: The oil passage groove (b) is arranged to pass through the outer convex disc body.

5. The output force amplification structure of a power head for a brake caliper according to claim 1, characterized in that: An annular groove is provided on the outer peripheral surface of the separation ring (3) or the inner wall surface of the piston (2) chamber, and a sealing leather cup A (7) is installed in the annular groove.

6. The output force amplification structure of a power head for a brake caliper according to claim 1, characterized in that: The screw (5) is coaxially connected to the output shaft of the motor of the external power head.

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