Thrust conversion device based on spring balls

Abstract

The utility model provides a thrust conversion device based on a spring ball. The thrust conversion device comprises a mandrel, a spring ball assembly, a lead screw, a nut and a piston. The mandrel is provided with a mandrel raceway; the lead screw is provided with a lead screw inner raceway and a lead screw outer raceway, the mandrel is located in an inner hole of the lead screw, the lead screw inner raceway is matched with the mandrel raceway, and the spring ball assembly is located between the lead screw inner raceway and the mandrel raceway. By adopting the ball screw and the spring ball assembly, the structure of the product is simplified, the space is reasonably utilized, and the structural size of the product is greatly reduced; wherein the structures of the spring ball assembly and the horizontal raceway are different from those of a traditional linear bearing, the low-friction rolling motion in the horizontal direction can be achieved, meanwhile, torque can be borne, and the torque of the mandrel can be transmitted to the lead screw; in addition, compared with pneumatic and hydraulic braking devices, the whole vehicle does not need to additionally provide pneumatic and hydraulic pressure sources, and the system is simpler, faster in response, shorter in braking distance and safer.

Description

TECHNICAL FIELD

[0001] The utility model relates to vehicle braking technology, concretely relates to a thrust conversion device based on spring ball. BACKGROUND

[0002] At present, disc brakes of vehicles on the market are mainly divided into two categories of air pressure and hydraulic pressure according to different power transmission media, but air and hydraulic brake systems generally have problems of complex structure, environmental pollution, slow response, complex control and the like, and cannot adapt to the development trend of future vehicle intelligentization and wire control. Therefore, the patent aims to design a thrust conversion device based on spring ball to replace the traditional air and hydraulic brake.

[0003] In the prior art, a brake using an electric driving mode appears, which mainly works on the principle of providing power based on a motor and then braking through a thrust conversion structure; that is, the thrust conversion structure converts the rotary power of the motor into linear thrust, and then the linear thrust completes the braking process. This braking mode is easier to realize linear control, achieves the purpose of precise control, and also has the advantages of simple structure, environmental friendliness and rapid response. However, in the existing thrust conversion structure, a lead screw structure is used to realize thrust conversion, and an axial pushing structure also needs to be provided, so the structure is relatively complex. UTILITY MODEL CONTENTS

[0004] To solve the problems in the above-mentioned technology, the utility model provides a technology that relies on the inner and outer structures of a lead screw to realize thrust transmission and simplify the overall structure.

[0005] The utility model provides a thrust conversion device based on spring ball, which comprises a mandrel, a spring ball assembly, a lead screw, a nut and a piston.

[0006] The mandrel has a mandrel raceway.

[0007] The spring ball assembly has a ball and springs arranged on both sides of the ball.

[0008] The lead screw has a lead screw inner raceway and a lead screw outer raceway, the mandrel is located in the lead screw inner hole, the lead screw inner raceway cooperates with the mandrel raceway, and the spring ball assembly is located between the lead screw inner raceway and the mandrel raceway.

[0009] The nut has a nut inner thread, the nut inner thread cooperates with the lead screw outer raceway through a rolling body, and the nut is fixed to a forceps body to keep the position fixed.

[0010] The piston moves following the axial movement of the lead screw or the nut.

[0011] Preferably, the nut outer peripheral wall has an axially arranged horizontal sliding groove, and a guide steel ball is arranged in the horizontal sliding groove; the piston has a steel ball groove matched with the guide steel ball.

[0012] The inner hole of the screw rod forms a first blocking wall, the mandrel has a second blocking wall, the first blocking wall and the second blocking wall form a compression space, springs are arranged on both sides of the ball, and the spring ball assembly is arranged in the compression space.

[0013] Preferably, the mandrel raceway and the screw rod inner raceway are axially arranged in multiple groups.

[0014] Preferably, the screw rod is matched with the piston through a bearing seat, the bearing seat has a main body part and a protruding part, the main body part is matched with the piston through a cylindrical roller bearing, and the protruding part is matched with the piston through a sliding bushing.

[0015] Preferably, the end of the protruding part is matched into a mounting site groove of the outer end part of the piston through a circlip, a needle bearing and a wave spring.

[0016] The circlip is fixed on the protruding part, the needle bearing is located between the circlip and the wave spring, and the other end of the wave spring abuts against the piston.

[0017] Preferably, the mounting site has a dust cover.

[0018] Preferably, an upstream end of the mandrel has a driving matching part for accepting rotary driving.

[0019] The beneficial effects of the utility model are as follows:

[0020] 1. The utility model adopts the matching mode of the ball screw and the spring ball assembly, the screw rod accepts rotary power from inside and is converted into axial movement; the structure of the product is simplified, space utilization is reasonable, and the structure size of the product is greatly reduced;

[0021] 2. The spring ball assembly and the horizontal raceway in the utility model are different from traditional linear bearings in structure, the scheme can realize low-friction rolling movement in the horizontal direction, can also bear torque, and can transmit the torque of the mandrel to the screw rod;

[0022] 3. Compared with a gas and hydraulic braking device, the vehicle does not need to additionally provide a gas and hydraulic pressure source, the system is more simple, responds faster, has a shorter braking distance, and is safer. DRAWINGS

[0023] Figure 1 It is a structure schematic view of the overall structure of the thrust conversion device based on the spring ball.

[0024] Figure 2 is a whole decomposition structure schematic view of the push force conversion device based on spring ball of the utility model;

[0025] Figure 3 is a whole structure one angle structure schematic view of the push force conversion device based on spring ball of the utility model;

[0026] Figure 4 is a whole structure of the push force conversion device based on spring ball of the utility model; Figure 3 is a structure schematic view of the C-C section view of the utility model;

[0027] Figure 5 is a structure schematic view of the mandrel of the push force conversion device based on spring ball of the utility model;

[0028] Figure 6 is a structure schematic view of the spring ball assembly of the push force conversion device based on spring ball of the utility model;

[0029] Figure 7 is a structure schematic view of the screw structure of the push force conversion device based on spring ball of the utility model;

[0030] Figure 8 is a structure schematic view of the nut structure of the push force conversion device based on spring ball of the utility model;

[0031] Figure 9 is a structure schematic view of the piston structure of the push force conversion device based on spring ball of the utility model;

[0032] Figure 10 is a structure schematic view of the spring ball assembly rotates before the mandrel-screw of the push force conversion device based on spring ball of the utility model;

[0033] Figure 11 is a structure schematic view of the spring ball assembly rotates after the mandrel-screw of the push force conversion device based on spring ball of the utility model;

[0034] Figure 12 is a structure schematic view of the mandrel-screw of the push force conversion device based on spring ball of the utility model;

[0035] Figure 13 is a structure schematic view of the push force conversion device based on spring ball of the utility model; Figure 12 is a structure schematic view of the ball rotates the mandrel-screw C-C section view of the utility model;

[0036] Explanation of reference signs:

[0037] 10 - mandrel; 11 - mandrel raceway; 121 - first barrier wall; 122 - second barrier wall; 13 - drive fitting part;

[0038] 20 - spring ball assembly; 21 - ball; 22 - spring;

[0039] 30 - lead screw; 31 - lead screw inner raceway; 32 - lead screw outer raceway;

[0040] 40 - nut; 41 - nut inner thread; 42 - horizontal sliding slot;

[0041] 50 - piston; 51 - steel ball groove; 52 - guide steel ball; 53 - mounting site;

[0042] 60 - rolling element;

[0043] 70 - bearing seat; 71 - main body part; 72 - protruding part;

[0044] 80 - cylindrical roller bearing; 90 - bushing; 100 - circlip; 110 - needle bearing; 120 - wave spring; 130 - dust cover. DETAILED DESCRIPTION

[0045] First embodiment:

[0046] As Figures 1 to 4 shown, the utility model provides a kind of spring ball-based thrust conversion device, it includes mandrel 10, spring ball assembly 20, lead screw 30, nut 40 and piston 50;

[0047] As Figure 5 shown, mandrel 10 has mandrel raceway 11;

[0048] As Figure 6 shown, spring ball assembly 20 has ball 21 and spring 22 arranged on both sides of ball 21;Two sides of spring hold ball 21 in middle position, to keep the position of ball 21, facilitate keeping stable in motion.

[0049] As Figure 7 shown, lead screw 30 has lead screw inner raceway 31 and lead screw outer raceway 32, lead screw inner raceway 31 is axially extended structure, and lead screw outer raceway 32 is spiral structure;The mandrel 10 is located in the inner hole of the lead screw 30, and the lead screw inner raceway 31 cooperates with the mandrel raceway 11, and the spring ball assembly 20 is located between the lead screw inner raceway 31 and the mandrel raceway 11;When mandrel 10 rotates, it will drive lead screw 30 to rotate by ball 21.

[0050] As Figure 8As shown, the nut 40 has a nut inner thread 41 which cooperates with the screw outer raceway 32 through the rolling body 60; the nut 40 is fixed to the clamp body to keep the position fixed; when the screw 30 rotates, the nut 40 keeps fixed, so that the screw 30 moves axially through the driving mode of the rolling ball screw pair, when the screw 30 moves axially relative to the mandrel 10, the springs on both sides keep stable to the rolling ball 21, and the relative sliding between the screw 30 and the mandrel 10 is realized through the rolling ball 21, and the sliding overcomes small friction and moves smoothly.

[0051] In specific applications, the thrust conversion structure of the brake-by-wire system of the application is applied to the brake in the prior art to brake, and the clamp body is a fixed structure on the brake, that is, the clamp body keeps fixed and does not move during the braking process. The nut 40 is connected and fixed with the clamp body to keep the position fixed, so that the screw 30 rotates and moves axially relative to the nut 40.

[0052] In combination Figure 9 As shown, the piston 50 moves following the axial movement of the screw 30 or the nut 40. When the screw 30 moves axially, the piston 50 moves axially, and the downstream side of the piston 50 is a brake pad of the existing brake, which realizes friction braking through the contact with the brake pad.

[0053] The working process of the thrust conversion device based on the spring rolling ball is as follows:

[0054] Brake clamping process: when the external rotating torque (motor power) is input to the mandrel 10, the rotating motion and torque are transmitted to the screw 30 under the action of the spring rolling ball assembly 20, the nut 40 is fixed with the external structure and keeps fixed; therefore, the screw 30 moves horizontally while rotating, and the piston 50 clamps the brake pad, and the brake pad is a structure on the existing brake, which belongs to the prior art and will not be described here; when the screw 30 moves horizontally, the rolling ball 21 of the spring rolling ball assembly 20 rolls in the axial raceway composed of the mandrel 10 and the screw 30, reducing the friction when the screw 30 slides on the mandrel 10; and the screw 30 is subjected to torque from the inner hole, and the screw outer raceway 32 of the screw 30 moves axially through cooperation with the rolling body 60, so that the screw 30 moves under the force from the inside and the outside at the same time, the overall force is more uniform, the structure is simple, and other structures needing axial movement are omitted, and the axial movement is realized through the screw 30.

[0055] Brake releasing process: the releasing process is completely opposite to the clamping process.

[0056] Second embodiment:

[0057] Preferably, the nut 40 has an axially arranged horizontal sliding groove 42 in the outer peripheral wall, and a guide steel ball 52 is arranged in the horizontal sliding groove 42; the piston 50 has a steel ball groove 51 matched with the guide steel ball 52; the guide steel ball 52 slides in the horizontal sliding groove 42 on the outer peripheral wall of the nut 40, preventing the piston 50 from rotating.

[0058] The inner hole of the lead screw 30 forms a first blocking wall 121, and the mandrel 10 has a second blocking wall 122, the first blocking wall 121 and the second blocking wall 122 form a compression space, and the spring ball assembly 20 is arranged in the compression space, and the spring ball assembly 20 is arranged in the compression space.

[0059] Preferably, the mandrel raceway 11 and the lead screw inner raceway 31 are axially arranged in multiple groups.

[0060] The spring ball assembly 20 corresponding to the above axially arranged multiple groups of raceways is composed of multiple springs 22 and balls 21, and the compressible stroke of the spring 22 is greater than the horizontal movement stroke of the piston 50, so as to ensure that the movement of the ball 21 is pure rolling, and the springs 22 arranged on both sides can keep the ball 21 in the middle position. Since the ball 21 will compress the spring 22 when rolling in the raceway 11, when the spring 22 is completely compressed, the ball 21 cannot move again, therefore, the spring 22 should not be in a completely compressed state during the entire working stroke of the piston 50, that is, the compressible stroke of the spring 22 should be greater than the piston 50, so as to ensure the normal working of the structure.

[0061] Preferably, the lead screw 30 is matched with the piston 50 through a bearing seat 70, the bearing seat 70 has a main body part 71 and a protruding part 72, the main body part 71 is matched with the piston 50 through a cylindrical roller bearing 80, and the protruding part 72 is matched with the piston 50 through a sliding bushing 90 for supporting and positioning. When the lead screw 30 moves axially, the cylindrical roller bearing 80 can drive the piston 50 to move.

[0062] Preferably, the end of the protruding part 72 is matched into the groove of the mounting part 53 of the outer end of the piston 50 through a circlip 100, a needle bearing 110 and a wave spring 120. Specifically, the circlip 100 is fixed on the protruding part 72, the needle bearing 110 is located between the circlip 100 and the wave spring 120, and the other end of the wave spring 120 abuts against the piston 50; such a structure can enable the protruding part 72 to stably rotate around the needle bearing 110, and the wave spring 120 provides pressure to keep the bearing in a stable state. Through the bearing structure arranged at two positions, that is, the needle bearing 110 and the cylindrical roller bearing 80 arranged on the front and back sides respectively, the rotation of the lead screw 30 is more stable and balanced.

[0063] A cylindrical roller bearing 80 and a needle roller bearing 110 are provided between the piston 50 and the bearing housing 70. This not only prevents the lead screw 30 from directly contacting and rubbing against the mating surface of the piston 50 when it rotates, but also pulls the piston 50 back when the lead screw 30 retracts. That is, when the lead screw 30 retracts, it drives the piston 50 to retract through the snap ring 100, the needle roller bearing 110, and the wave spring 120 in sequence.

[0064] Preferably, the mounting part 53 has a dust cover 130, which seals the lead screw 30 and other components inside the piston 50, thus providing protection.

[0065] Preferably, the upstream end of the mandrel 10 has a drive engagement portion 13, which is used to receive rotational drive.

[0066] exist Figure 12 , 13 In this arrangement, when the spindle 10 rotates counterclockwise, the contact point between the ball 21 and the spindle 10 in the spring ball assembly 20 is the second contact point 24, and the contact point between the ball 21 and the lead screw 30 is the first contact point 23. The angle between the line ab connecting the first contact point 23 and the second contact point 24 and the vertical diameter direction cd is an acute angle. This arrangement makes it easier to transmit torque under stress. This method results in a more rational stress distribution in the entire structure, allowing for the transmission of a larger torque within the same dimensions.

Claims

1. A spring-ball based thrust translation device, characterized by, It comprises: a mandrel (10) with a mandrel raceway (11); a spring ball assembly (20) with a ball (21) and springs (22) arranged on both sides of the ball (21); a screw rod (30) with a screw rod inner raceway (31) and a screw rod outer raceway (32), the mandrel (10) is located in the inner hole of the screw rod (30), and the screw rod inner raceway (31) matches the mandrel raceway (11), the spring ball assembly (20) is located between the screw rod inner raceway (31) and the mandrel raceway (11); a nut (40) with a nut inner thread (41), the nut inner thread (41) matches the screw rod outer raceway (32) through a rolling body (60); the nut (40) is fixed to the body of the forceps to keep the position fixed; a piston (50) that follows the movement under the axial movement of the screw rod (30) or the nut (40).

2. The spring ball-based thrust conversion device according to claim 1, wherein the outer peripheral wall of the nut (40) has an axially arranged horizontal sliding groove (42), a guide steel ball (52) is arranged in the horizontal sliding groove (42); the piston (50) has a steel ball groove (51) matched with the guide steel ball (52); the inner hole of the screw rod (30) forms a first blocking wall (121), the mandrel (10) has a second blocking wall (122), the first blocking wall (121) and the second blocking wall (122) form a compression space, and springs (22) are arranged on both sides of the ball (21), and the spring ball assembly (20) is arranged in the compression space.

3. The spring-ball based thrust translation device of claim 1, wherein, The mandrel raceway (11) and the screw rod inner raceway (31) are both axially arranged in multiple groups.

4. The spring-ball based thrust translation device of claim 1, wherein, An upstream end of the mandrel (10) has a driving matching part (13) for receiving a rotary drive.

5. The spring-ball based thrust translation device of claim 1, wherein, The outer peripheral wall of the nut (40) is symmetrically arranged with horizontal sliding grooves (42) on both sides.

6. The spring-ball based thrust translation device of claim 1, wherein, The screw rod (30) matches the piston (50) through a bearing seat (70), and the bearing seat (70) has a main body part (71) and a protruding part (72).

7. The spring-ball based thrust translation device of claim 6, wherein, The main body part (71) matches the piston (50) through a cylindrical roller bearing (80), and the protruding part (72) matches the piston (50) through a sliding bushing (90).

8. The spring-ball based thrust translation device of claim 7, wherein, An end of the protruding part (72) is matched into a mounting part (53) groove of an outer end of the piston (50) through a circlip (100), a needle roller bearing (110) and a wave spring (120).

9. The spring-ball based thrust translation device of claim 8, wherein, The circlip (100) is fixed on the protruding part (72), the needle roller bearing (110) is located between the circlip (100) and the wave spring (120), and the other end of the wave spring (120) abuts against the piston (50).

10. The spring-ball based thrust translation device of claim 8, wherein, The mounting part (53) has a dust cover (130).

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