ball screw

Abstract

The utility model provides a kind of ball screw, including nut, screw rod and several ball, the nut and screw rod between formed with the raceway for the rolling arrangement of several ball, the one end of the screw rod is provided with end cap, the anti-rotation cooperation between the end cap and nut, end cap is also provided with limit block, the limit block can form the abutment limit between screw rod after nut reset. In view of the deficiency of prior art, the utility model provides a kind of ball screw, which can avoid the collision between screw rod and end cap, and facilitate the installation of both on the basis of ensuring the anti-rotation effect of end cap and nut.

Description

Technical Field

[0001] This utility model relates to the field of bearings, and in particular to a ball screw. Background Technology

[0002] As the automotive industry moves towards greater integration and linearization, the performance requirements of braking systems, as core components ensuring driving safety, continue to upgrade. With the advancement of automotive electrification and intelligentization, drive-by-wire technology, with its advantages of simplified structure, high integration, and precise control, is propelling braking systems into a new stage of development: electronic braking (EMB). EMB directly achieves braking through motor-driven actuators, eliminating the need for intermediate transmission links such as hydraulic lines. This not only further shortens braking response time but also enables seamless collaboration with vehicle autonomous driving systems, becoming a core development direction for future high-end automotive braking systems. Ball screws, as a key component of EMB... The key transmission component in the system is responsible for converting the rotational motion of the motor into linear motion and transmitting braking torque. However, in the existing ball screw technology, the end cap of the screw only serves a sealing or assembly positioning function. When the braking system is not reset, the screw and the end cap are prone to rigid impact, which may not only cause damage to the parts, but also lead to a significant increase in the starting torque of subsequent braking, affecting the braking response. In addition, the end cap and nut are mostly connected by a flat fit. However, with this connection method, if the interference is too large, it will lead to assembly difficulties, and if the interference is too small, it will not be able to guarantee the anti-rotation effect. Utility Model Content

[0003] To address the shortcomings of existing technologies, this utility model provides a ball screw that can prevent the lead screw from colliding with the end cap and facilitates the installation of both the end cap and the nut while ensuring their anti-rotation effect.

[0004] To achieve the above objectives, this utility model provides a ball screw, including a nut, a screw rod, and a plurality of balls. A raceway is formed between the nut and the screw rod for the balls to roll. An end cap is provided at one end of the screw rod. An anti-rotation component is provided between the end cap and the nut to form an anti-rotation engagement between the two. A limit block is also provided on the end cap. The limit block can form an abutment limit with the screw rod after the nut is reset.

[0005] The advantages of the above technical solution are: by setting an anti-rotation component between the end cap and the nut, a reliable anti-rotation fit is achieved. Compared with the traditional flat fit, there is no need to consider the interference, resulting in higher stability and easier installation. Furthermore, the limit block set on the end cap can form an abutment limit with the screw after the nut is reset, effectively avoiding damage to components caused by the screw directly hitting the end cap and excessive starting torque, thus ensuring the stability of the ball screw transmission efficiency and the reliability of operation.

[0006] This utility model can be further configured such that: an abutment block is provided at one end of the end cap corresponding to the lead screw, and the limiting block can move to the movement trajectory of the abutment block during the nut reset process.

[0007] By further configuring the design, an abutment block is installed at one end of the corresponding end cap of the lead screw, allowing the limiting block to move precisely onto the movement trajectory of the abutment block during the nut reset process. During the reset process, the two form a circumferential abutment, avoiding collisions caused by direct contact between the limiting block and the lead screw body, reducing the risk of component damage, and improving the stability and service life of the product.

[0008] The present invention can be further configured such that: the end cap and the nut are joined together to form a limiting groove, and the anti-rotation component is disposed in the limiting groove.

[0009] By further designing the limiting groove formed by the end cap and nut, an installation and positioning space is provided for the anti-rotation component, which facilitates a tight fit between the anti-rotation component and the two components to achieve the purpose of anti-rotation, improve the reliability of anti-rotation, and make installation and processing simpler and more convenient.

[0010] This utility model can be further configured such that the anti-rotation component is cylindrical.

[0011] With further design, the circular contact surface can distribute the force evenly, and the cylindrical shape can eliminate the need for an installation angle, making installation more convenient.

[0012] The present invention can be further configured such that: a self-aligning groove is provided at the other end of the lead screw, and the self-aligning groove is spherically shaped.

[0013] By further refining the design, the original requirement to fit a self-aligning shim on the outer convex surface of the ball screw would not only increase the axial dimension of the ball screw but also reduce the thickness of the self-aligning shim. This application, through the design of the self-aligning groove, can shorten the axial dimension of the ball screw while ensuring the thickness of the self-aligning shim and increasing its strength, while still satisfying the self-aligning function. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the internal structure of an embodiment of the present utility model; Figure 2 This is an exploded view of an embodiment of the present utility model; Figure 3 This is a schematic diagram of the end cap structure in an embodiment of the present utility model; Figure 4 This is a schematic diagram of the lead screw structure in an embodiment of the present invention. Figure 1 ; Figure 5 This is a schematic diagram of the lead screw structure in an embodiment of the present invention. Figure 2 ; The components include: nut 1; lead screw 2; abutment block 21; self-aligning groove 22; ball bearing 3; end cap 4; limit block 41; anti-rotation component 5; and limit groove 6. Detailed Implementation

[0015] An embodiment of this utility model of a ball screw is shown below. Figure 1-5 As shown: It includes a nut 1, a lead screw 2 and several balls 3. A raceway is formed between the nut 1 and the lead screw 2 for the balls 3 to roll. An end cap 4 is provided at one end of the lead screw 2. An anti-rotation component 5 is provided between the end cap 4 and the nut 1 to form an anti-rotation engagement between the two. A limit block 41 is also provided on the end cap 4. The limit block 41 can form an abutment limit with the lead screw 2 after the nut 1 is reset.

[0016] A stop block 21 is provided at one end of the lead screw 2 corresponding to the end cap 4. The limiting block 41 can move to the movement trajectory of the stop block 21 during the reset of the nut 1.

[0017] The end cap 4 and the nut 1 are joined together to form a limiting groove 6, and the anti-rotation component 5 is disposed in the limiting groove 6.

[0018] The anti-rotation component 5 is cylindrical in shape.

[0019] A self-aligning groove 22 is provided at the other end of the lead screw 2, and the self-aligning groove 22 is spherical.

[0020] The above examples are merely one preferred embodiment of this utility model. Ordinary variations and substitutions made by those skilled in the art within the scope of this utility model's technical solution are all included within the protection scope of this utility model.

Claims

1. A ball screw, comprising a nut, a screw rod, and a plurality of balls, wherein a raceway is formed between the nut and the screw rod for the plurality of balls to roll, characterized in that: An end cap is provided at one end of the lead screw. An anti-rotation component is provided between the end cap and the nut to form an anti-rotation engagement between the two. A limit block is also provided on the end cap. The limit block can form an abutment limit with the lead screw after the nut is reset.

2. The ball screw according to claim 1, characterized in that: An abutment block is provided at one end of the lead screw corresponding to the end cap, and the limiting block can move to the movement trajectory of the abutment block during the nut reset process.

3. The ball screw according to claim 1 or 2, characterized in that: The end cap and nut are joined together to form a limiting groove, and the anti-rotation component is set in the limiting groove.

4. The ball screw according to claim 3, characterized in that: The anti-rotation component is cylindrical in shape.

5. The ball screw according to claim 1, 2, or 4, characterized in that: A self-aligning groove is provided at the other end of the lead screw, and the self-aligning groove is spherically shaped.

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