Thrust conversion assembly and brake-by-wire system

Abstract

The utility model provides a thrust conversion assembly and a brake-by-wire system. The thrust conversion assembly comprises a double-face lead screw, a nut and an inner lead screw. The double-sided lead screw is provided with an outer roller path and an inner roller path; the nut is provided with an inner nut raceway, and the inner nut raceway is matched with the outer raceway through an outer ball assembly. The inner lead screw is provided with an inner lead screw raceway, and the inner lead screw raceway is matched with the inner raceway through an inner ball assembly. According to the utility model, the inner and outer spiral raceways of the double-sided lead screw are respectively matched with the spiral raceways of the nut and the inner lead screw, so that higher bearing capacity can be obtained under the same outer diameter size. That is to say, through the effect of the double-face lead screw, the thrust conversion process is provided from inside and outside at the same time, the transmission mode of the lead screw is more stable, stress is more uniform, and the bearing capacity is improved. In addition, based on electric driving, 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 kind of push force conversion assembly for brake-by-wire system. BACKGROUND

[0002] At present, traditional vehicle disc brake is mainly divided into two categories of air pressure and hydraulic pressure according to different power transmission media. However, air and hydraulic brake systems generally have problems such as complex structure, environmental pollution, slow response and complex control, which cannot adapt to the development trend of future vehicle intelligentization and brake-by-wire.

[0003] In the prior art, a brake using electric drive mode appears, which mainly works on the principle of providing power by motor and then braking through push force conversion structure. That is, the push force conversion structure converts the rotary power of the motor into linear thrust, and then the linear thrust completes the braking process. This braking method is easier to realize linear control and achieve precise control, and also has the advantages of simple structure, environmental friendliness and fast response. However, in the existing push force conversion structure, when a lead screw structure is used to realize push force conversion, the lead screw structure is usually single-sided or single-group push force conversion, and the overall force of the lead screw is insufficient, which cannot provide greater carrying capacity. SUMMARY

[0004] To solve the problems in the above-mentioned technology, the utility model provides a technology for improving the running stability of the lead screw and improving the reverse carrying capacity during pushing.

[0005] The push force conversion assembly provided by the utility model comprises a double-sided lead screw, a nut and an inner lead screw.

[0006] The double-sided lead screw has an outer raceway and an inner raceway.

[0007] The nut has an inner nut raceway, which cooperates with the outer raceway through an outer ball assembly.

[0008] The inner lead screw has an inner lead screw raceway, which cooperates with the inner raceway through an inner ball assembly.

[0009] Preferably, the end of the inner lead screw is provided with a locking nut, which abuts against one side of the nut.

[0010] Preferably, the end of the inner lead screw has a disc part, and the outer thread is arranged on the disc part and cooperates with the inner thread of the locking nut.

[0011] Preferably, the outer circumferential surface of the locking nut forms a wrench matching profile.

[0012] Preferably, the outer circumferential surface of the nut has an axially arranged horizontal sliding groove for cooperating with the guide block.

[0013] Preferably, the outer circumferential surface of the nut has two axially arranged horizontal sliding grooves, which are evenly distributed along the outer circumferential surface.

[0014] Preferably, a screw rod seat is further included, which is connected and matched with the double-sided screw rod for driving the double-sided screw rod to rotate.

[0015] Preferably, the inner hole of the double-sided screw rod has a first pin groove located at one side of the inner raceway; the mounting groove of the screw rod seat has a matching protrusion with a second pin groove, the matching protrusion is matched and mounted with the inner hole so that the first pin groove and the second pin groove are arranged in alignment, and a cylindrical pin is matched with the first pin groove and the second pin groove to circumferentially fix the double-sided screw rod.

[0016] Preferably, the screw rod seat has a driving part, and the outer circumference of the driving part is matched with the cylindrical roller bearing.

[0017] The linear brake system provided by the utility model has the advantages that:

[0018] The utility model discloses a linear brake system has the advantages that:

[0019] 1. The inner and outer spiral raceways of the double-sided screw rod are matched with the nut and the spiral raceway of the inner screw rod respectively, and greater bearing capacity can be obtained under the same outer diameter size.

[0020] 2. The utility model is driven in an electric mode, and compared with a gas or hydraulic brake device, the vehicle does not need to additionally provide a gas or hydraulic pressure source, the system is more simple, responds faster, has shorter braking distance and is safer. DRAWINGS

[0021] Figure 1 It is the structure schematic diagram of the whole structure of the utility model discloses a thrust conversion subassembly;

[0022] Figure 2 It is the structure schematic diagram of the exploded structure of the utility model discloses a thrust conversion subassembly;

[0023] Figure 3 It is the structure schematic diagram of one perspective of the utility model discloses a thrust conversion subassembly;

[0024] Figure 4 is a kind of thrust conversion assembly of the utility model Figure 3 The structure diagram of A-A direction section view of the utility model;

[0025] Figure 5 It is the structure diagram of double screw of the utility model of a kind of thrust conversion assembly;

[0026] Figure 6 It is the structure diagram of nut of the utility model of a kind of thrust conversion assembly;

[0027] Figure 7 It is the structure diagram of screw seat of the utility model of a kind of thrust conversion assembly;

[0028] Figure 8 It is the structure diagram of inner screw of the utility model of a kind of thrust conversion assembly;

[0029] Figure 9 It is the structure diagram of the main body structure of the utility model of a kind of wire control brake system;

[0030] Explanation of reference signs:

[0031] 1-double screw;11-outer raceway;12-inner raceway;13-first pin slot;

[0032] 2-nut;21-inner nut raceway;22-horizontal sliding slot;

[0033] 3-inner screw;31-inner screw raceway;32-disc part;

[0034] 4-outer ball assembly;5-inner ball assembly;

[0035] 6-locking nut;

[0036] 7-screw seat;71-driving part;72-cylindrical pin;73-cylindrical roller bearing;74-second pin slot;75-matching protrusion;

[0037] 8-brake shoe;9-jaw body;91-guiding block;10-wire control brake system thrust conversion structure. DETAILED DESCRIPTION

[0038] Example 1:

[0039] As Figures 1 to 4 shown, the utility model provides a kind of thrust conversion assembly, it includes double screw 1, nut 2 and inner screw 3;

[0040] combining Figure 5 shown, double screw 1 has outer raceway 11 and inner raceway 12;

[0041] combiningFigure 6 As shown, the nut 2 has an inner nut raceway 21 which cooperates with the outer raceway 11 through the outer ball assembly 4;

[0042] In combination Figure 8 As shown, the inner lead screw 3 has an inner lead screw raceway 31 which cooperates with the inner raceway 12 through the inner ball assembly 5.

[0043] In this structure, the double-sided lead screw 1 realizes a double ball screw pair, so that the force is more stable when the thrust is converted, and the carrying capacity is improved.

[0044] The working process of the thrust conversion assembly is as follows:

[0045] The clamping process is as follows: the external rotary torque is input to the double-sided lead screw 1, the double-sided lead screw 1 rotates together, the torque is converted into horizontal motion and thrust through the inner and outer ball screw pairs, the nut 2 and the inner lead screw 3 are pushed forward, and the brake piece is pushed to brake;

[0046] The release process: this process is completely opposite to the clamping process.

[0047] Embodiment 2:

[0048] Preferably, the inner lead screw 3 is provided with a locking nut 6 abutting against one side of the nut 2. When the double-sided lead screw 1 converts rotary power into linear thrust, through the design of the ball, the nut 2 and the inner lead screw 3 need to be circumferentially limited, that is, the nut 2 and the inner lead screw 3 can only move axially horizontally and cannot move circumferentially; here, the locking nut 6 abuts against one side of the nut 2, so that when the nut 2 moves axially, the locking nut 6 moves axially; here, only the nut 2 needs to be circumferentially limited. In the specific embodiment, the locking nut 6 can be fixedly connected to the nut 2; or the friction between the nut 2 and the locking nut 6 can limit the inner lead screw 3 circumferentially, so that the inner lead screw 3 and the nut 2 move axially together to brake.

[0049] Preferably, the end of the inner lead screw 3 has a disc part 32, and the outer thread is arranged on the disc part 32, and the outer thread cooperates with the inner thread of the locking nut 6. The locking nut 6 is conveniently disassembled through the thread cooperation.

[0050] Preferably, the outer circumferential surface of the locking nut 6 forms a wrench cooperation profile. The locking nut 6 is conveniently disassembled through the wrench cooperation profile.

[0051] Preferably, the outer circumferential surface of the nut 2 has an axially arranged horizontal groove 22, which is used to cooperate with the guide block 91. The design of the horizontal groove 22 achieves circumferential limiting. That is, when the thrust conversion structure of this embodiment is applied to the braking system, circumferential limiting is achieved through the cooperation of the guide block 91 and the horizontal groove 22. In this way, when the double-sided lead screw 1 rotates, the axial movement of the nut 2 can be achieved through the ball joint.

[0052] Preferably, the outer circumferential surface of the nut 2 has two axially arranged horizontal grooves 22 on both sides, that is, there are two axially arranged horizontal grooves 22 on the outer circumferential surface, and the two horizontal grooves 22 are evenly distributed along the outer circumferential surface. The horizontal grooves 22 on both sides provide circumferential limiting, making the force more stable.

[0053] Preferably, the system further includes a lead screw holder 7, which is connected and engaged with the double-sided lead screw 1 to drive the double-sided lead screw 1 to rotate. The lead screw holder 7 receives the power driven by the motor and then transmits it to the double-sided lead screw 1 to rotate.

[0054] Preferably, combined with Figure 7 As shown, the inner hole of the double-sided lead screw 1 has a first pin groove 13, which is located on one side of the inner raceway 12; the mounting groove of the lead screw seat 7 has a mating protrusion 75, which has a second pin groove 74. The mating protrusion 75 is installed in conjunction with the inner hole so that the first pin groove 13 and the second pin groove 74 are aligned. The cylindrical pin 72 is engaged with the first pin groove 13 and the second pin groove 74 to circumferentially fix the double-sided lead screw 1.

[0055] Preferably, the lead screw seat 7 has a drive part 71, the outer periphery of which cooperates with the cylindrical roller bearing 73.

[0056] Example 3:

[0057] like Figure 9 As shown, the present invention provides a brake-by-wire system, which includes a brake pad 8, a clamp body 9, and a thrust conversion structure 10 for the brake-by-wire system. The thrust conversion structure 10 for the brake-by-wire system adopts the thrust conversion structure described in any of the previous embodiments, and the clamp body 9 has a guide block 91, which is used to cooperate with the nut 2 to perform axial guiding movement.

[0058] The lead screw seat 7 is used to receive the power driven by the motor and then transmit it to the double-sided lead screw 1 for rotation. The double-sided lead screw 1 drives the inner lead screw 3 to move axially through the inner ball assembly 5, and at the same time drives the nut 2 to move axially through the outer ball assembly 4. The nut 2 and the inner lead screw 3 contact the brake pad 8 for contact and pressure braking. The specific braking principle and process are existing technologies and will not be described in detail here.

[0059] When the above embodiment scheme is adopted:

[0060] 1、The utility model discloses a screw rod is provided with the inner and outer screw raceways of double -sided, and the screw raceway of inner screw rod is matched with the screw raceway of nut, and the same outer diameter size can obtain greater carrying capacity, that is, through the effect of double -sided screw rod, it provides the thrust conversion process from inside and outside simultaneously, and the transmission mode of screw rod is more stable, and the stress is more uniform, and the carrying capacity is improved.

[0061] 2、The utility model discloses based on electric mode drive, relative to gas, liquid pressure brake device, whole car need not extra gas, liquid pressure source, and the system is more simple, and response is faster, and the braking distance is shorter, and safer.

Claims

1. A thrust conversion component, characterized in that, include: The double-sided lead screw (1) has an outer raceway (11) and an inner raceway (12); Nut (2) has an inner nut raceway (21), which is engaged with the outer raceway (11) by an outer ball assembly (4); The inner lead screw (3) has an inner lead screw raceway (31), which is connected to the inner raceway (12) via an inner ball assembly (5).

2. The thrust conversion component according to claim 1, characterized in that, The end of the inner lead screw (3) is provided with a locking nut (6), which abuts against one side of the nut (2).

3. The thrust conversion component according to claim 2, characterized in that, The end of the internal lead screw (3) has a disc portion (32), on which an external thread is provided, and the external thread engages with the internal thread of the locking nut (6).

4. The thrust conversion component according to claim 2, characterized in that, The outer circumferential surface of the locking nut (6) forms a wrench-fitting profile.

5. The thrust conversion assembly according to claim 1, characterized in that, The outer peripheral surface of the nut (2) has an axially arranged horizontal groove (22) for cooperating with the guide block (91).

6. The thrust conversion assembly according to claim 5, characterized in that, The outer circumferential surface of the nut (2) has two axially arranged horizontal grooves (22), which are evenly distributed along the outer circumferential surface.

7. The thrust conversion assembly according to claim 1, characterized in that, It also includes a lead screw seat (7), which is connected and cooperates with the double-sided lead screw (1) to drive the double-sided lead screw (1) to rotate.

8. The thrust conversion assembly according to claim 7, characterized in that, The inner hole of the double-sided lead screw (1) has a first pin groove (13), which is located on one side of the inner raceway (12); the mounting groove of the lead screw seat (7) has a mating protrusion (75), which has a second pin groove (74). The mating protrusion (75) is installed in conjunction with the inner hole so that the first pin groove (13) and the second pin groove (74) are aligned. The cylindrical pin (72) is engaged with the first pin groove (13) and the second pin groove (74) to circumferentially fix the double-sided lead screw (1).

9. The thrust conversion assembly according to claim 7, characterized in that, The lead screw seat (7) has a drive part (71), the outer periphery of which is engaged with a cylindrical roller bearing (73).

10. A brake-by-wire system, characterized in that, The device includes a brake pad (8), a clamp body (9), and a thrust conversion structure (10) for a brake-by-wire system. The thrust conversion structure (10) for the brake-by-wire system adopts the thrust conversion structure according to any one of claims 1 to 9. The clamp body (9) has a guide block (91) for axial guiding movement in conjunction with the nut (2).

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