Vehicle short-distance ball screw with screw side circulation

Abstract

The utility model relates to a screw side circulating short-distance ball screw for a vehicle, which relates to the technical field of ball screws, and comprises a screw, a nut and a ball, the nut is in threaded connection with the screw, and the screw is provided with a ball slideway for the ball to roll. The ball slide way comprises a spiral slide way and a reset slide way, wherein the spiral slide way is spirally formed in the side face of the lead screw in the circumferential direction, the reset slide way is formed in the lead screw, and the spiral slide way and the reset slide way are connected end to end. A reverser used for guiding the balls to enter and exit is arranged at the joint of the spiral sliding way and the reset sliding way. The utility model has the effects of transmission accuracy and stability of the ball screw.

Description

Technical Field

[0001] This utility model relates to the technical field of ball screws, and more particularly to a short-stroke ball screw for automotive applications with a screw-side circulation system. Background Technology

[0002] As a precision transmission component widely used in the industrial field, the ball screw can efficiently convert rotary motion into linear motion, or vice versa, playing a key role in many mechanical devices.

[0003] In the traditional ball screw structure, the balls are typically mounted on a nut, and the screw and nut move relative to each other via the balls. The inner circumference of the nut is machined with a rolling path for the balls to circulate within this path, thus achieving transmission. This traditional structure has revealed some limitations in long-term application. The complex ball-accommodating space and circulation channels that need to be machined inside the nut result in a high degree of complexity in the design and manufacturing process of the nut. Furthermore, even minor errors during machining can affect the ball's trajectory and circulation smoothness, thereby reducing the transmission accuracy and stability of the ball screw. Utility Model Content

[0004] To improve the transmission accuracy and stability of ball screws, this utility model provides a short-stroke ball screw for automotive applications with screw-side circulation.

[0005] This utility model provides a short-stroke ball screw for automotive applications with a lead screw side circulation system, employing the following technical solution:

[0006] A short-stroke ball screw for automotive applications with a lead screw side circulation system includes a lead screw, a nut threaded onto the lead screw, and balls. The lead screw has a ball track for the balls to roll. The ball track includes a helical track circumferentially spirally formed on the side of the lead screw and a return track formed inside the lead screw, with the helical track and the return track connected end-to-end. A reversing device for guiding the balls in and out is provided at the connection between the helical track and the return track.

[0007] By adopting the above technical solution, compared with the traditional internal circulation ball screw, the ball track is opened on the screw, allowing the balls to roll on the screw, and a reverser is set to guide the rolling of the balls. Compared with the complex machining inside the screw nut, it is easier to machine the ball track on the outer surface of the screw. Due to the reduced complexity of the manufacturing process, the error during the machining process is reduced, thereby improving the transmission accuracy and stability of the ball screw.

[0008] Optionally, the inner wall of the nut has a threaded groove; the balls are evenly distributed along the spiral slide to form a threaded portion that mates with the threaded groove.

[0009] By adopting the above technical solution, the balls are evenly distributed along the spiral slide to form a threaded part similar to a screw thread. By cooperating with the threaded groove of the nut, the transmission accuracy and stability of the ball screw can be improved.

[0010] Optionally, the lead screw has an embedding groove for the reversing device to be embedded and installed.

[0011] By adopting the above technical solution, the reverser and the lead screw are set separately, which allows the reverser to be manufactured independently and can be replaced and maintained when the reverser has a problem.

[0012] Optionally, the reverser has an inlet for the balls to roll in and an outlet for the balls to roll out; the reverser has a connecting channel inside connecting the inlet and the outlet.

[0013] By adopting the above technical solution, the connection channel of the traditional reverser is directly exposed to the outside. When the ball rolls through the reverser, some of the ball will protrude from the reverser. Now, the connection channel is opened inside the reverser, so that the ball rolls directly through the inside of the reverser, which is less likely to affect the rolling of the ball.

[0014] Optionally, the inverter includes a first side and a second side that are separately configured, with each side having half of the connection channel.

[0015] By adopting the above technical solution, the inverter is divided into two parts, which can be manufactured separately, thus facilitating the processing of the connection channel.

[0016] Optionally, the reverser has a guide portion that guides the threaded portion into the threaded groove when the lead screw engages with the nut.

[0017] By adopting the above technical solution, when assembling the lead screw and nut, the guide part can first enter the thread groove, and then the threaded part composed of balls can enter the thread groove. The guide part guides the threaded part into the thread groove, which facilitates the assembly of the ball screw.

[0018] Optionally, the lead screw includes a transmission rod, a drive portion sleeved on the transmission rod, and a locking member for locking the drive portion to the transmission rod; the ball and the reverser are located in the drive portion, and the end of the transmission rod has a spline for connection to an external device.

[0019] Optionally, the drive unit has a polygonal through hole, and the transmission rod has a plug-in portion that mates with the through hole.

[0020] By adopting the above technical solution, the through hole is designed as a polygon, and the plug is adapted to it, so that when the drive unit is installed on the transmission rod, the two are not easy to rotate relative to each other.

[0021] Optionally, the nut has a receiving cavity with an opening on one side, the drive part of the lead screw is located in the receiving cavity and the transmission rod extends out on one side.

[0022] By adopting the above technical solution, the single-sided opening structure makes the overall volume of the ball screw smaller and its travel shorter, making it suitable for short-travel environments in automobiles.

[0023] Optionally, the outer wall of the nut is provided with a keyway for connecting to an external device to restrict the circumferential rotation of the nut.

[0024] In summary, this utility model has at least one of the following beneficial technical effects:

[0025] A short-stroke ball screw for automotive applications with side circulation, compared to traditional internal circulation ball screws, features ball tracks on the screw itself, allowing the balls to roll along the screw. A reverser is used to guide the ball rolling. Compared to complex machining inside the nut, machining the ball tracks on the outer surface of the screw is easier. This reduced manufacturing complexity minimizes machining errors, thereby improving the transmission accuracy and stability of the ball screw.

[0026] The reverser and the lead screw are separate, which allows the reverser to be manufactured independently and can be replaced and maintained when the reverser malfunctions.

[0027] The connecting channel is located inside the reverser, allowing the balls to roll directly through the reverser without protruding and thus minimizing the impact on their rolling motion. Furthermore, the reverser is divided into two parts, which can be manufactured separately, facilitating the processing of the connecting channel. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of a short-stroke ball screw for automotive applications with a lead screw side circulation according to an embodiment of this utility model;

[0029] Figure 2 This is an exploded view of the lead screw according to an embodiment of the present invention;

[0030] Figure 3 This is a schematic diagram of the drive unit according to an embodiment of the present invention;

[0031] Figure 4 This is a schematic diagram of the structure of the inverter according to an embodiment of the present invention.

[0032] The parts referred to by the numbers in the above figures are as follows: 1. Lead screw; 11. Transmission rod; 12. Drive unit; 121. Ball slide; 1211. Helical slide; 1212. Reset slide; 122. Threaded part; 123. Insert groove; 13. Locking element; 14. Spline; 15. Abutment part; 16. Insertion part; 17. Through hole; 2. Nut; 21. Receiving cavity; 22. Threaded groove; 23. Keyway; 3. Ball; 4. Reversing device; 41. Guide part; 42. Roller inlet; 43. Roller outlet; 44. Connecting channel; 45. First side; 46. Second side. Detailed Implementation

[0033] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0034] This utility model discloses a short-stroke ball screw with a lead screw side circulation for use in automobiles for short-stroke control.

[0035] Reference Figure 1 A short-stroke ball screw for automotive applications with a lead screw side circulation system includes a lead screw 1, a nut 2, balls 3, and a reversing device 4. The lead screw 1 and nut 2 are threaded together. When the nut 2 is restricted from rotation, if the lead screw 1 rotates, the nut 2 can move along the lead screw 1. In this embodiment, the lead screw 1 of the ball screw has a single-sided extension structure.

[0036] The ball screw nut 2 is a cylinder with an opening on one side and a receiving cavity 21. The inner wall of the receiving cavity 21 has a threaded groove 22. The outer wall of the ball screw nut 2 has a keyway 23, through which the ball screw nut 2 can be connected and fixed to external equipment, so that when the ball screw is in use, the ball screw nut 2 will not rotate circumferentially, but will move in a straight line.

[0037] Reference Figure 1 and Figure 2 The lead screw 1 includes a transmission rod 11, a drive unit 12, and a locking member 13. The end of the transmission rod 11 has a spline 14 that connects to an external power source for transmitting power. The transmission rod 11 has a disc-shaped abutment portion 15. The drive unit 12 is sleeved on the outside of the transmission rod 11, and is locked and fixed by the locking member 13 pressing the drive unit 12 against the abutment portion 15.

[0038] The transmission rod 11 has a plug-in portion 16, and the drive portion 12 has a through hole 17 for the plug-in portion 16 to pass through and plug in. The cross-section of the through hole 17 is polygonal, and the cross-section of the plug-in portion 16 is the same as the cross-section of the through hole 17.

[0039] When installing the ball screw, first put the drive part 12 onto the insertion part 16, and then lock it in place by the locking part 13 to complete the assembly of the screw 1. Finally, rotate the drive part 12 of the screw 1 into the receiving cavity 21 of the screw nut 2, and finally the transmission rod 11 of the screw 1 extends out on one side of the screw nut 2.

[0040] Reference Figure 1 and Figure 3 In this embodiment, both the ball bearing 3 and the reverser 4 are mounted on the drive section 12 of the lead screw 1, and the stroke of the ball screw is related to the ball bearing 3.

[0041] The drive unit 12 is provided with a ball slide 121 for the ball 3 to roll, and the ball slide 121 includes two sections: a spiral slide 1211 that is spirally opened on the side of the drive unit 12 and a reset slide 1212 opened inside the drive unit 12. The spiral slide 1211 and the reset slide 1212 are connected end to end.

[0042] The balls 3 are densely and evenly distributed along the ball track 121. Specifically, the balls 3 located in the spiral track 1211 protrude from the surface of the drive unit 12, thus forming a threaded portion 122 along the path of the spiral track 1211. This threaded portion 122 is entirely composed of balls 3. When the drive unit 12 is located inside the nut 2, the threaded portion 122 engages with the threaded groove 22 of the nut 2. Furthermore, because the balls 3 abut against the inner wall of the nut 2, the nut 2 confines the balls 3 within the ball track 121, ensuring that the balls 3 can only roll within the ball track 121 and will not fall off the drive unit 12.

[0043] There are two reversers 4, which are fixed at the two connection points of the spiral slide 1211 and the reset slide 1212 respectively. The reversers 4 are used to guide the balls 3 to smoothly enter and exit the reset slide 1212. The reversers 4 can be integrally formed with the drive unit 12, or they can be formed separately and installed on the drive unit 12. In this embodiment, the reversers 4 are formed separately to facilitate the maintenance of the reversers 4 in the future.

[0044] In order to prevent the reverser 4 from affecting the threaded connection between the lead screw 1 and the lead nut 2, the drive unit 12 is provided with an embedding groove 123 for the reverser 4 to be embedded and installed.

[0045] Reference Figure 1 and Figure 4 The reverser 4 has a guide portion 41 protruding from the surface of the drive portion 12. The guide portion 41 can serve as the beginning and end ends of the threaded portion 122, so that when the lead screw 1 and the lead nut 2 are engaged, the threaded portion 122 can smoothly enter the threaded groove 22.

[0046] The reverser 4 has a roller inlet 42 for the ball 3 to roll in and a roller outlet 43 for the ball 3 to roll out. The roller inlet 42 and the roller outlet 43 are connected by a connecting channel 44, and the connecting channel 44 is located inside the reverser 4, so that the ball 3 will not protrude from the surface of the reverser 4 when it is located inside the connecting channel 44.

[0047] The inverter 4 includes a first side 45 and a second side 46 that are separately arranged. Each of the first side 45 and the second side 46 has half of a connecting channel 44 to facilitate the processing of the connecting channel 44. When installing the inverter 4 on the driver, the first side 45 and the second side 46 are first joined together, and then simultaneously installed into the insert groove 123. Since both the inverter 4 and the driver 12 are located within the nut 2, the nut 2 can limit the inverter 4, making it difficult for the inverter 4 to separate during use.

[0048] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. A short-stroke ball screw for a vehicle with a side circulation of a screw rod, comprising a screw rod (1), a nut (2) threadedly connected to the screw rod (1), and balls (3), characterized in that, The lead screw (1) is provided with a ball slide (121) for the ball (3) to roll. The ball slide (121) includes a spiral slide (1211) spirally opened on the side of the lead screw (1) and a reset slide (1212) opened inside the lead screw (1). The spiral slide (1211) and the reset slide (1212) are connected end to end. A reverser (4) for guiding the ball (3) in and out is provided at the connection between the spiral slide (1211) and the reset slide (1212).

2. A short-stroke ball screw with side circulation of the screw rod according to claim 1, characterized in that, The inner wall of the nut (2) has a threaded groove (22); the balls (3) are evenly distributed along the spiral slide (1211) to form a threaded portion (122) that mates with the threaded groove (22).

3. The short-stroke ball screw with side circulation of the screw rod according to claim 1, characterized in that, The lead screw (1) has an embedding groove (123) for the reversing device (4) to be embedded and installed.

4. The short-stroke ball screw with side circulation of the screw rod according to claim 3, characterized in that, The reverser (4) has a roller inlet (42) for the ball (3) to roll in and a roller outlet (43) for the ball (3) to roll out; the reverser (4) has a connecting channel (44) inside connecting the roller inlet (42) and the roller outlet (43).

5. The short-stroke ball screw with side circulation of the screw rod according to claim 4, wherein The inverter (4) includes a first side (45) and a second side (46) that are separately configured, with the first side (45) and the second side (46) each having half of the connection channel (44).

6. A short-stroke ball screw with side circulation of the screw rod according to claim 2, wherein The reverser (4) has a guide (41) that guides the threaded portion (122) into the threaded groove (22) when the lead screw (1) engages with the nut (2).

7. The short-stroke ball screw with side circulation of the screw rod according to claim 1, wherein The lead screw (1) includes a transmission rod (11), a drive part (12) sleeved on the transmission rod (11), and a locking member (13) that locks the drive part (12) to the transmission rod (11); the ball (3) and the reverser (4) are located in the drive part (12), and the end of the transmission rod (11) has a spline (14) connected to an external power source.

8. The short-stroke ball screw with a side recirculation of the screw rod according to claim 7, wherein The drive unit (12) has a polygonal through hole (17), and the transmission rod (11) has a plug-in part (16) that mates with the through hole (17).

9. The short-stroke ball screw with a side recirculation of the screw rod according to claim 7, wherein The nut (2) has a receiving cavity (21) with an opening on one side, the drive part (12) of the lead screw (1) is located in the receiving cavity (21) and the transmission rod (11) extends out on one side.

10. The short-stroke ball screw with a side recirculation of the screw rod according to claim 9, wherein The outer wall of the nut (2) is provided with a keyway (23) for connecting with external equipment to restrict the circumferential rotation of the nut (2).

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