Ball screw pair for automobile brake system

Abstract

The utility model discloses a ball screw pair for an automobile braking system, which comprises a lead screw and a nut, the lead screw and the nut are respectively provided with a threaded track, the lead screw is in threaded fit with the nut through the threaded track, a steel ball is also arranged in the threaded track in a rolling manner, and the steel ball is arranged in the threaded track. A circulating reversing mechanism is arranged at the position, corresponding to the steel ball, of the nut or the lead screw, driving teeth used for driving the nut to rotate are arranged on the peripheral face of the nut, a matching groove is formed in the end face of the nut, a lubricating window is arranged on the bottom face of the matching groove, and grease storage cotton is arranged in the matching groove. A matching groove is formed in the nut, a matching thread is arranged at the position, close to an opening, of the matching groove, a matching piece is further arranged in the matching groove in a matched mode, the matching piece comprises a limiting head, a smooth rod and a threaded rod which are sequentially connected, a hook body is arranged at the free end of the threaded rod, a limiting gasket is further arranged between the limiting head and the nut, and the limiting gasket is arranged in a fracture mode. And meanwhile, the grease storage is convenient, and the service life is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to a ball screw pair for automobile brake system. BACKGROUND

[0002] Ball screw pair is the key in automobile brake system, which is composed of screw, nut, ball and circulating reverse mechanism, and when working, it converts screw rotary motion into nut linear motion through rolling friction or converts nut rotation into screw linear motion, and ball is circulated and maintained by circulating reverse mechanism. In automobile brake system, ball screw pair is widely used. In electromechanical brake system, it quickly responds and accurately converts power to realize braking, and some models of Tesla shorten braking distance by using it; in electric power brake system, it amplifies pedal force to solve the problem of brake power of new energy vehicles; in parking brake system, it provides reliable braking force to improve the stability of electronic parking brake. It has obvious advantages, high precision, high efficiency of more than 90%, energy saving, alloy steel manufacturing and raceway heat treatment to make it wear-resistant, high rigidity and stable, ensuring smooth and safe braking. However, the existing ball screw pair structure is prone to failure after long-term use, and it is necessary to add lubricating grease to ensure the long-term stable operation of the structure, which leads to difficult maintenance and complicated operation, and is not conducive to improving the maintenance efficiency and affecting the use reliability of the structure. SUMMARY

[0003] In view of the defects of the prior art, the utility model provides a ball screw pair for automobile brake system, which is more reliable in operation, can adapt to different driving modes, and is convenient for storing and replacing grease, prolonging the service life of the structure.

[0004] To achieve the above purpose, the utility model provides a ball screw pair for automobile brake system, which comprises a screw and a nut, screw and nut are respectively provided with screw tracks, screw and nut are screwedly connected through screw tracks, steel balls are further arranged in screw tracks, circulating reverse mechanism is arranged on the nut or screw corresponding to the position of the steel ball, driving teeth for driving the nut to rotate are arranged on the outer periphery of the nut, internal splines for force driving are arranged on the screw, a matching groove is arranged on the end face of the nut, a lubricating window for connecting the screw track is arranged on the bottom surface of the matching groove, grease storage wool is arranged in the matching groove, a matching screw thread is arranged near the opening of the matching groove, a matching part is further arranged in the matching groove, the matching part comprises a limiting head, a smooth rod part and a threaded rod part connected in sequence, the sum of the lengths of the smooth rod part and the threaded rod part is less than the depth of the matching groove, the length of the smooth rod part is longer than the matching screw thread, a hook body for winding the grease storage wool is arranged at the free end of the threaded rod part, a limiting washer for clamping the matching part is further arranged between the limiting head and the nut, and the limiting washer is arranged at the breaking point.

[0005] The beneficial effects of this design are as follows: This configuration allows for two modes of motion: First, torque is transmitted to the drive teeth on the nut, which rotate the nut. The force and torque are then transmitted through the steel balls, causing the lead screw to move axially along the internal spline guide. Second, external torque is transmitted to the internal spline of the lead screw, causing it to rotate. The force and torque are then transmitted through the steel balls, causing the nut to move axially. This lead screw and nut structure, using the meshing of the drive teeth or the spline as torque input, improves the accuracy, efficiency, and stability of the motion, resulting in better transmission stability of the ball screw pair. Furthermore, the use of lubricating grease ensures smooth operation and better directional transmission of the ball screw pair. Furthermore, a fitting component is provided here, which is screw-shaped. The length of the smooth rod is longer than the mating thread, and the allowance in length is equivalent to the thickness of the limiting washer. This allows the fitting component to rotate freely after installation, enabling the hook to engage the grease reservoir. Free rotation is possible when the limiting washer is not present. After installing the limiting washer, the fitting component rises, causing the threaded rod to abut against the mating thread, thus restricting its rotation. After removing the limiting washer, the fitting component can continue to rotate and engage the grease reservoir. Further rotation allows the threaded rod to engage with the mating thread, gradually removing the fitting and simultaneously taking out the grease reservoir. A new grease reservoir can then be inserted, ensuring lubrication. This simple structure facilitates grease reservoir replacement, provides excellent lubrication, and extends the structure's service life.

[0006] As a further feature of this invention, the hook body includes a hook tip and a coiled portion forming a limiting cavity.

[0007] The beneficial effects of this design are as follows: the limiting cavity formed by the coiling of the traction hook end has a unique structure that is highly compatible with the grease reservoir. When the grease reservoir needs to be wound into the limiting cavity for fixation, the shape and size design of the limiting cavity can precisely guide the winding of the grease reservoir, avoiding displacement or insecure fixation. This design not only greatly improves the efficiency of installing the grease reservoir but also ensures the stability of the grease reservoir within the limiting cavity, preventing the grease reservoir from falling out during removal.

[0008] As a further feature of this invention, the limiting cavity is shaped like a spindle.

[0009] The beneficial effect of such an arrangement is that the spindle-shaped unique shape leaves more space for winding compared to a conventional shape. The larger winding structure enables smoother and more efficient winding of the material during the winding operation, reduces the phenomenon of winding difficulty or jamming caused by space constraints, and better extrudes the grease in the grease storage cotton. At the same time, the winding of the grease storage cotton can be accurately guided, and the conditions of deviation or fixed instability are avoided. This structure not only greatly improves the efficiency of taking out the grease storage cotton, but also ensures the stability of the grease storage cotton in the limiting cavity to avoid falling of the grease storage cotton during the taking-out process.

[0010] As a further arrangement of the present application, an anti-skid groove is arranged on the contact surface of the limiting head and the limiting gasket, and a first rubber ring is arranged in the anti-skid groove.

[0011] The beneficial effect of such an arrangement is that the assembly stability is enhanced. When assembling the limiting gasket, the anti-skid groove increases the roughness of the contact surface, and the first rubber ring further fills the gap and tightly fits the surface of the fitting part by virtue of its good elasticity and friction. In this way, the influence of external forces can be effectively resisted, the position of the fitting part after assembly is accurate and stable, and the phenomenon of rotation caused by factors such as vibration and impact is fundamentally eliminated, thereby providing a solid guarantee for the normal operation of the entire system.

[0012] As a further arrangement of the present application, a shallow groove is arranged on the nut along the circumferential direction of the fitting groove, and a second rubber ring is arranged in the shallow groove.

[0013] The beneficial effect of such an arrangement is that the assembly stability is enhanced. When assembling the limiting gasket, the anti-skid groove increases the roughness of the contact surface, and the first rubber ring further fills the gap and tightly fits the surface of the fitting part by virtue of its good elasticity and friction. In this way, the influence of external forces can be effectively resisted, the position of the fitting part after assembly is accurate and stable, and the phenomenon of rotation caused by factors such as vibration and impact is fundamentally eliminated, thereby providing a solid guarantee for the normal operation of the entire system. BRIEF DESCRIPTION OF DRAWINGS

[0014] Fig. 1 is a structural schematic view of an embodiment of the present application;

[0015] Fig. 2 is a sectional structural schematic view of an embodiment of the present application;

[0016] Fig. 3 is a sectional local enlarged view of the position of the fitting part in the embodiment of the present application. DETAILED DESCRIPTION

[0017] The present application provides an embodiment of a ball screw pair for an automobile braking system, as shown inFigs. 1 to 3 As shown, the device includes a lead screw 1 and a nut 2. Both the lead screw 1 and nut 2 are provided with threaded tracks, and the lead screw 1 and nut 2 are threadedly engaged via these tracks. A steel ball 3 is also rolled within the threaded tracks. A reversing mechanism is provided on the nut 2 or lead screw 1 corresponding to the position of the steel ball 3. The outer circumference of the nut 2 is provided with drive teeth for rotating the nut 2. The lead screw 1 is provided with an internal spline for force-driven operation. The end face of the nut 2 is provided with a mating groove, and the bottom surface of the mating groove is provided with a lubrication window for connecting to the threaded tracks. The mating groove contains... The ball screw assembly 6 has a grease reservoir 6. A threaded engagement is provided near the opening of the mating groove. A mating component 5 also fits into the groove. The mating component 5 includes a limiting head 51, a smooth rod 52, and a threaded rod 53 connected in sequence. The sum of the lengths of the smooth rod 52 and the threaded rod 53 is less than the depth of the mating groove. The length of the smooth rod 52 is longer than the threaded engagement. A hook for wrapping the grease reservoir 6 is provided at the free end of the threaded rod 53. A limiting washer for locking the mating component 5 is provided between the limiting head 51 and the nut 2. The limiting washer has a broken end. The beneficial effects of this design are: with this screw 1 and nut 2 structure, the torque input is obtained through the meshing of drive teeth or splines, improving the accuracy, efficiency, and stability of the motion, resulting in better transmission stability of the ball screw assembly 1. Simultaneously, the use of grease ensures smooth operation and better directional transmission of the ball screw assembly 1. Furthermore, a fitting component 5 is provided here, which is screw-shaped. The smooth rod portion 52 is longer than the mating thread, and the length margin is approximately equal to the thickness of the limiting washer. This allows the fitting component 5 to rotate freely after installation, enabling the hook to engage the grease reservoir 6. Free rotation occurs when the limiting washer is not present. After the limiting washer is installed, the fitting component 5 is raised, causing the threaded rod portion 53 to abut against the mating thread, thus restricting its rotation. After the limiting washer is removed, the fitting component 5 can still rotate freely and engage the grease reservoir 6. Continuing to rotate the fitting component 5 allows the threaded rod portion 53 to engage with the mating thread, gradually removing the fitting component 5 and simultaneously taking out the grease reservoir 6. A new grease reservoir 6 can then be inserted, ensuring lubrication. This structure is simple, facilitates the replacement of the grease reservoir 6, has good performance, provides excellent lubrication, and extends the service life of the structure.

[0018] As a further arrangement of the present embodiment, the hook body comprises a hook tip and a coiled limiting cavity. The beneficial effect of such an arrangement is that the coiled limiting cavity of the hook end is uniquely configured to be well adapted to the fat storage wool 6. When the fat storage wool 6 needs to be rolled into the limiting cavity for fixation, the shape and size of the limiting cavity are designed to precisely guide the rolling of the fat storage wool 6, avoiding deviation or loose fixation. This design not only greatly improves the efficiency of installing the fat storage wool 6, but also ensures the stability of the fat storage wool 6 in the limiting cavity, avoiding the fat storage wool 6 from falling during removal.

[0019] As a further arrangement of the present embodiment, the limiting cavity is in a spindle shape. The beneficial effect of such an arrangement is that the unique shape of the spindle shape leaves more space for rolling. During the rolling operation, the larger rolling structure enables the material to be rolled in more smoothly and efficiently, reducing the phenomenon of winding difficulty or jamming caused by space constraints, while better extruding the grease in the oil storage wool. At the same time, it can precisely guide the rolling of the fat storage wool 6, avoiding deviation or loose fixation. This structure not only greatly improves the efficiency of removing the fat storage wool 6, but also ensures the stability of the fat storage wool 6 in the limiting cavity, avoiding the fat storage wool 6 from falling during removal.

[0020] As a further arrangement of the present embodiment, the contact surface of the limiting head 51 and the limiting gasket is provided with an anti-slip groove, and a first rubber ring is arranged in the anti-slip groove. The beneficial effect of such an arrangement is that it enhances the assembly stability. When assembling the limiting gasket, the anti-slip groove increases the roughness of the contact surface, and the first rubber ring further fills the gap, tightly adhering to the surface of the fitting part 5 by its good elasticity and friction. In this way, it can effectively resist the influence of external forces, ensure the precise and stable position of the fitting part 5 after assembly, and fundamentally eliminate the rotation phenomenon caused by factors such as vibration and collision, providing a solid guarantee for the normal operation of the entire system.

[0021] As a further arrangement of the present embodiment, the nut 2 is provided with a shallow groove along the circumference of the fitting groove, and a second rubber ring is arranged in the shallow groove. The beneficial effect of such an arrangement is that it enhances the assembly stability. When assembling the limiting gasket, the anti-slip groove increases the roughness of the contact surface, and the second rubber ring further fills the gap, tightly adhering to the surface of the limiting gasket by its good elasticity and friction. In this way, it can effectively resist the influence of external forces, ensure the precise and stable position of the limiting gasket after assembly, and fundamentally eliminate the rotation phenomenon caused by factors such as vibration and collision, providing a solid guarantee for the normal operation of the entire system.

[0022] The above examples are only one of the preferred specific examples of the present application, and the usual changes and replacements made by those skilled in the art within the technical scheme of the present application are included in the protection scope of the present application.

Claims

1. A ball screw assembly for an automotive braking system, comprising a screw and a nut, wherein the screw and the nut are respectively provided with threaded tracks, the screw and the nut are threadedly engaged via the threaded tracks, and steel balls are rolled in the threaded tracks; a reversing mechanism is provided on the nut or the screw corresponding to the positions of the steel balls, characterized in that: The nut has driving teeth on its outer circumference for rotating, the lead screw has internal splines for receiving force, the nut end face has a mating groove, the bottom of the mating groove has a lubrication window for connecting the threaded track, the mating groove contains grease reservoir, the mating groove has a mating thread near the opening, and a mating component also fits in the mating groove. The mating component includes a limiting head, a smooth rod, and a threaded rod connected in sequence. The sum of the lengths of the smooth rod and the threaded rod is less than the depth of the mating groove, the length of the smooth rod is longer than the mating thread, the free end of the threaded rod has a hook for wrapping the grease reservoir, and a limiting washer for clamping the mating component is provided between the limiting head and the nut. The limiting washer has a broken end.

2. The ball screw assembly for an automotive braking system according to claim 1, characterized in that: The hook body includes a hook tip and a coiled portion forming a limiting cavity.

3. The ball screw assembly for an automotive braking system according to claim 2, characterized in that: The limiting cavity is arranged in a spindle shape.

4. The ball screw assembly for an automotive braking system according to claim 1, characterized in that: An anti-slip groove is provided on the contact surface between the limiting head and the limiting washer, and a first rubber ring is provided in the anti-slip groove.

5. The ball screw assembly for an automotive braking system according to claim 4, characterized in that: The nut has a shallow groove along the circumference of the mating groove, and a second rubber ring is provided in the shallow groove.

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