Empb brake system ball screw

Abstract

An EMB braking system ball screw comprises a screw nut, a screw and balls, the screw nut and the screw are provided with a first channel and a second channel respectively, the first channel and the second channel are matched to form a channel allowing the balls to move therein, an assembly groove allowing the output end of a driving motor to be inserted therein is formed in the center of the screw, and the assembly groove is matched with the first channel and the second channel. A clamping groove matched with the output end of the driving motor is formed in the tail end of the assembling groove and used for being fixed to the output end of the driving motor and transmitting driving force provided by the driving motor to the lead screw. The beneficial effects of the utility model are that: firstly, because the clamping groove is arranged at the tail end of the assembling groove, the output end of the driving motor can be well covered by the assembling groove, so that the space occupied by the whole structure is reduced during use; and secondly, the lead screw is directly connected with the driving motor through the clamping groove, so that the driving force provided by the driving motor can directly act on the lead screw, and the transmission stability is effectively improved.

Description

Technical Field

[0001] The utility model relates to a ball screw, in particular to an EMB brake system ball screw. Background Art

[0002] The EMB Braking System Ball Screw is a high-precision linear motion system widely used in automation equipment, robots, precision machinery and other fields. It consists of a screw with a spiral raceway and a matching nut with circulating steel balls inside. These steel balls circulate in a closed raceway, converting rotary motion into linear motion while providing predictable load-bearing capacity. The ball screw is designed to reduce friction, improve efficiency, and allow precise position control. The EMB Braking System Ball Screw also has a self-locking function, which can keep the load stable and ensure safety even in the event of a power outage. It is easy to maintain and has high reliability, making it an ideal choice for precision positioning.

[0003] Chinese patent document CN118046882A discloses an EMB brake system ball screw, including a screw and a nut threadedly mounted on the screw, the second gear being connected to the nut, the power of the drive motor being transmitted to the nut through the meshing first gear and the second gear; the end of the screw is rotatably connected to the brake member through a connecting rod, the nut drives the screw to reciprocate in a straight line, thereby driving the brake member to switch between a braking state and a non-braking state.

[0004] In the above scheme, the driving motor drives the nut to move through the linkage of the first gear and the second gear, and drives the lead screw to move through the nut. However, the above scheme has the following disadvantages: there are too many transmission parts between the driving motor and the ball screw, which makes the structure of the ball screw too large, and the current market has higher and higher requirements for the compact space of this type of ball screw, but the existing technology cannot well match the market demand. Utility Model Content

[0005] In view of the deficiencies in the prior art, the utility model provides an EMB brake system ball screw in which a driving source is directly connected to the ball screw so as to make the ball screw more compact.

[0006] To achieve the above-mentioned objectives, the technical solution of the utility model is as follows: a ball screw for an EMB brake system, comprising a screw nut, a screw and a ball, the screw nut and the screw being respectively provided with a first groove and a second groove, the first groove and the second groove cooperating with each other to form a groove for the ball to move therein, an assembly groove being provided at the center of the screw for inserting the output end of the drive motor, a clamping groove being provided at the end of the assembly groove for cooperating with the output end of the drive motor, the clamping groove being used to be fixed with the output end of the drive motor and to transmit the driving force provided by the drive motor to the screw.

[0007] The beneficial effects of the utility model are as follows: an assembly groove for placing the output end of the drive motor is arranged inside the lead screw, and a clamping groove fixedly matched with the output end of the drive motor is arranged at the end of the assembly groove. Firstly, since the clamping groove is arranged at the end of the assembly groove, the output end of the drive motor can be well covered by the assembly groove, thereby reducing the space occupied by the overall structure when in use; secondly, the lead screw is directly connected to the drive motor through the clamping groove, so that the driving force provided by the drive motor can directly act on the lead screw, thereby effectively improving the transmission stability.

[0008] Furthermore, the engaging groove comprises a fixing groove, and a spline is provided on the inner peripheral wall of the fixing groove, and the spline cooperates with the output end of the driving motor to form a fixation between the lead screw and the driving motor.

[0009] The inner wall of the fixing groove is covered with splines that are engaged with the output end of the driving motor, thereby forming a stable and effective connection with the output end of the driving motor. That is, the driving motor is directly engaged with the lead screw without the need for a transmission part, which saves space and reduces manufacturing costs.

[0010] Furthermore, the clamping groove also includes an anti-slip groove, the inner diameter of which is gradually increased from an end connected to the fixing groove toward an end away from the fixing groove, and the cross-section of the inner peripheral wall of the anti-slip groove is arc-shaped.

[0011] The inner peripheral wall of the anti-slip groove has an arc-shaped cross section and the arc is gradually enlarged toward the end away from the fixed groove. While making the lead screw hollow to reduce the weight of the lead screw body, the arc surface cooperates with the output end of the drive motor to further ensure that the driving force provided by the drive motor can be effectively transmitted to the lead screw to drive the lead screw to move. At the same time, the anti-slip groove is provided with an inverted arc at the end away from the fixed groove, that is, the outer diameter of the cross section of the anti-slip groove at the end away from the fixed groove is reduced, so that after the output end of the drive motor is installed in the anti-slip groove, the axial deviation of the output end of the drive motor can be effectively prevented, thereby ensuring that the output end of the drive motor can always maintain a snap-fit ​​with the fixed groove.

[0012] Furthermore, it also includes an end cover with an opening at one end, a connecting strip is provided on the end cover and the connecting strip is arranged in the direction of the end cover opening, one end of the outer peripheral surface of the screw nut is provided with a connecting notch that matches the connecting strip, and the end cover is connected to the screw nut by welding the connecting strip at the connecting notch, and the outer diameter of the connecting strip is less than or equal to the outer diameter of the screw nut.

[0013] The end cover and the screw nut are connected by welding, so that when they are not connected, it is easier to process the first groove inside the screw nut; and after the end cover and the screw nut are welded, while having a dust-proof effect, the outer diameter of the connecting strip is less than or equal to the outer diameter of the screw nut, thereby further making the structure of the ball screw in this scheme more compact to adapt to the current market demand for smaller and smaller volume of this type of ball screw.

[0014] Furthermore, it also includes a retaining spring, and the connecting strip is provided with a retaining spring groove for placing the retaining spring, and after the retaining spring is placed in the retaining spring groove, its outer diameter is less than or equal to the outer diameter of the connecting strip.

[0015] After the retaining spring is placed in the retaining spring groove, it can provide axial support for the screw nut when the ball screw in this solution moves, so as to prevent the screw nut from axially deviating when it moves, thereby effectively ensuring the position stability of the screw nut during operation. And after the retaining spring is placed in the retaining spring groove, its outer diameter is less than or equal to the outer diameter of the connecting strip, that is, less than or equal to the outer diameter of the screw nut, so that the structure is more compact.

[0016] Furthermore, a connecting keyway and a reverser for causing the balls to circulate and rotate in the channel are symmetrically arranged on the outer peripheral surface of the lead screw nut, and the reverser is staggered with the connecting keyway.

[0017] The connecting keyway can ensure the connection stability between the screw nut and the external component, and the reverser arranged offset with the connecting keyway on the outer peripheral surface of the screw nut can make the ball rotating in the channel circulate in the channel to prevent the ball from escaping from the channel after the screw moves laterally. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a side view of the embodiment of the utility model after being assembled with the drive motor;

[0019] Figure 2 A bottom view of an embodiment of the utility model;

[0020] Figure 3 A cross-sectional view of an embodiment of the utility model;

[0021] Figure 4 It is a cross-sectional view of the embodiment of the utility model after being assembled with the drive motor;

[0022] Figure 5 It is a cross-sectional view of the clamping groove of an embodiment of the utility model. DETAILED DESCRIPTION

[0023] The utility model embodiment of an EMB brake system ball screw Figure 1-5As shown: it includes a screw nut 1, a screw 2, a ball 3 and an end cover 5, the screw nut 1 and the screw are respectively provided with a first channel 14 and a second channel 23 that cooperate with each other to form a channel 4 for the ball 3 to rotate therein, and the outer circumference of the screw nut 1 is provided with a connecting keyway 11 for connecting to an external component and a reverser 12 for enabling the ball 3 in the channel 4 to realize cyclic rotation, and the reverser 12 and the connecting keyway 11 are staggered on the outer circumference.

[0024] The structure of the lead screw nut 1 is that both ends are open, and a connection notch 13 is provided on the outer circumference of one end of one of the openings, and a connection strip 51 matching the cross-sectional shape of the peripheral wall is provided on the end cover 5 corresponding to the connection notch 13. The end cover 5 and the lead screw nut 1 are connected by welding the connection strip 51 on the connection notch 13, and after the connection, the outer diameter of the connection strip 51 is smaller than the outer diameter of the lead screw nut 1. A retaining spring groove 511 with a built-in retaining spring 52 is also provided on the connecting strip 51 to provide axial support force for the lead screw nut 1 during operation.

[0025] The interior of the lead screw 2 is hollow, and an assembly groove 21 for inserting the drive motor is provided at the center of the lead screw 2. A clamping groove 22 is provided at the end of the assembly groove 21 toward its bottom. The clamping groove 22 includes a fixed groove 221 arranged away from the assembly groove 21 and an anti-slip groove 223 arranged close to the assembly groove 21. The inner circumferential wall of the fixed groove 221 is covered with splines 222 that are clamped and fixed to the output end 6 of the drive motor. The cross-sectional outer diameter of the anti-slip groove 223 at one end connected to the fixed groove 221 is smaller than the cross-sectional outer diameter of the end connected to the assembly groove 21, and the outer diameter changes gradually from one end of the fixed groove 221 toward one end of the assembly groove 21. At the same time, the cross-sectional outer diameter of the anti-slip groove 223 is arc-shaped. In order to prevent the output end 6 of the driving motor from falling out of the clamping groove 22, the anti-slip groove 223 is also provided with an anti-slip portion 224 at one end thereof connected to the assembly groove 21. The cross-sectional outer diameter of the anti-slip portion 224 is gradually reduced from the side connected to the anti-slip groove 223 toward the side of the assembly groove 21, thereby being able to effectively include the output end 6 of the driving motor to prevent it from falling out of the clamping groove 22.

[0026] The following is a brief description of the usage of this embodiment: when the output end 6 of the driving motor rotates, since a fixed connection is formed between it and the clamping groove 22, it can directly drive the screw 2 to rotate, and the screw 2 is confined in the screw nut 1. Therefore, when the ball 3 rotates along the channel 4, the screw 2 is driven by the driving motor to move forward and backward directly without the need for other transmission components.

[0027] The above embodiment is only one of the preferred specific embodiments of the present invention. Common changes and substitutions made by those skilled in the art within the technical solution of the present invention are all included in the protection scope of the present invention.

Claims

1. A ball screw for an EMB brake system, comprising a screw nut, a screw and a ball, wherein the screw nut and the screw are respectively provided with a first groove and a second groove, the first groove and the second groove cooperate to form a groove for the ball to move therein, characterized in that: An assembly groove for inserting the output end of the drive motor is provided at the center of the lead screw, and a clamping groove matching the output end of the drive motor is provided at the end of the assembly groove. The clamping groove is used to fix the output end of the drive motor and transmit the driving force provided by the drive motor to the lead screw.

2. The EMB brake system ball screw according to claim 1, characterized in that: The clamping groove comprises a fixing groove, and a spline is arranged on the inner peripheral wall of the fixing groove. The spline cooperates with the output end of the driving motor to form a fixation between the lead screw and the driving motor.

3. The EMB brake system ball screw according to claim 2, characterized in that: The clamping groove also includes an anti-slip groove, the inner diameter of which is gradually increased from one end connected to the fixing groove toward one end away from the fixing groove, and the inner peripheral wall of the anti-slip groove has an arc-shaped cross section.

4. The EMB brake system ball screw according to claim 1, characterized in that: It also includes an end cover with an opening at one end, a connecting strip is provided on the end cover and the connecting strip is arranged in the direction of the end cover opening, a connecting notch is provided at one end of the outer peripheral surface of the screw nut and matches the connecting strip, the end cover is connected to the screw nut by welding the connecting strip at the connecting notch, and the outer diameter of the connecting strip is less than or equal to the outer diameter of the screw nut.

5. The EMB brake system ball screw according to claim 4, characterized in that: It also includes a retaining spring, and the connecting strip is provided with a retaining spring groove for placing the retaining spring. After the retaining spring is placed in the retaining spring groove, the outer diameter of the retaining spring is less than or equal to the outer diameter of the connecting strip.

6. The EMB brake system ball screw according to claim 1, characterized in that: A connecting keyway and a reverser for causing the balls to circulate and rotate in the channel are symmetrically arranged on the outer peripheral surface of the lead screw nut, and the reverser is staggered with the connecting keyway.

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