A ball screw hydraulic device

Abstract

The present invention relates to the field of vehicle braking technology, and in particular, to a ball screw hydraulic device. A driving assembly, the driving assembly includes a stator, a rotor, a screw and a nut. A hydraulic assembly, the hydraulic assembly includes a hydraulic cylinder and a piston barrel. A transmission assembly, the transmission assembly includes a first set of units, a second set of units, and an abutment ball. The ball screw hydraulic device also includes a pressurized state. The pressurized state includes the interaction between the stator and the rotor causing the rotor to rotate, the rotating rotor drives the screw to rotate and drive the nut to move in a direction close to the hydraulic cylinder, and the moving nut drives the piston barrel to move in a direction close to the hydraulic cylinder through the transmission assembly to reduce the cavity surrounded by the hydraulic cylinder and the piston barrel. In this way, the problem of easy wear between the piston barrel and the inner wall of the hydraulic cylinder is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle braking, and in particular to a ball screw hydraulic device. Background Art

[0002] With the development of the vehicle industry, the requirements for vehicle performance are increasing, especially in the field of vehicle braking technology. Traditional vehicle braking usually uses hydraulic braking to achieve braking effect by using hydraulic oil to transmit pressure. However, the unified supply of hydraulic oil makes the oil pipeline of hydraulic oil longer and the braking effect is delayed. Existing vehicle braking usually adopts wire control, installing a motor on the wheel side of the vehicle, and braking the vehicle through a ball screw hydraulic device. The ball screw hydraulic device includes a drive assembly and a hydraulic assembly. The drive assembly includes a stator, a rotor, a screw rod, and a nut. The hydraulic assembly includes a hydraulic cylinder and a piston cylinder. The piston cylinder is pushed by the drive nut to compress the hydraulic oil in the hydraulic cylinder, thereby generating braking force to brake the vehicle. The wire control method allows the vehicle to respond quickly, thereby achieving rapid braking of the vehicle.

[0003] However, when the ball screw hydraulic device is working, the connection between the nut and the piston cylinder may not be concentric, which will cause increased wear between the piston cylinder and the inner wall of the hydraulic cylinder when the ball screw hydraulic device is working, affecting the service life of the ball screw hydraulic device. At the same time, it will also cause the braking force of the ball screw hydraulic device to decrease, affecting the braking effect. Summary of the invention

[0004] In order to solve the problem of easy wear between the piston barrel and the inner wall of the hydraulic cylinder, the present invention provides a ball screw hydraulic device, the ball screw hydraulic device comprising:

[0005] A driving assembly, the driving assembly comprising a stator, a rotor, a screw rod and a nut; the rotor is arranged in a hollow cavity of the stator; the rotor is detachably connected to the screw rod; the nut is sleeved on the outer peripheral side of the screw rod;

[0006] A hydraulic assembly, the hydraulic assembly comprising a hydraulic cylinder and a piston barrel; at least a portion of the piston barrel is disposed in the hydraulic cylinder; the piston barrel is slidably connected to the hydraulic cylinder;

[0007] A transmission assembly, the transmission assembly comprising a first set unit, a second set unit, and abutment beads; the first set unit is sleeved on the outer peripheral side of the second set unit; the first set unit and the second set unit are arranged at intervals; at least part of the abutment beads are embedded in the first set unit; the abutment beads and the second set unit are arranged at intervals; one end of the first set unit and the second set unit is fixedly connected to the nut, and one end of the other is fixedly connected to the piston cylinder;

[0008] The ball screw hydraulic device also includes a pressurized state; the pressurized state includes the interaction between the stator and the rotor causing the rotor to rotate, the rotating rotor drives the screw to rotate and drive the nut to move toward the direction close to the hydraulic cylinder, and the moving nut drives the piston cylinder to move toward the direction close to the hydraulic cylinder through the transmission assembly to reduce the cavity surrounded by the hydraulic cylinder and the piston cylinder.

[0009] In some embodiments, the nut is fixedly connected to the first set unit; the piston cylinder is fixedly connected to the second set unit; and the ratio of the outer diameter of the piston cylinder to the inner diameter of the nut is less than or equal to a set value.

[0010] In some embodiments, the piston cylinder is fixedly connected to the first set unit; the nut is fixedly connected to the second set unit; and the ratio of the outer diameter of the piston cylinder to the inner diameter of the nut is greater than a set value.

[0011] In some embodiments, the first set unit includes a first set body and a limiting groove; a plurality of the limiting grooves are evenly distributed on the first set body along the circumference of the first set body; the abutment bead is partially arranged in the limiting groove; the abutment bead extends away from one end of the limiting groove toward a direction close to the second set unit.

[0012] In some embodiments, the second sleeve unit includes a second sleeve body and a second limiting ring; the side of the second limiting ring close to the central axis of the second sleeve body is fixedly connected to the side of the second sleeve body close to the first sleeve body; the second limiting ring is arranged at an end of the second sleeve unit away from the connection between the second sleeve unit and the nut or the piston cylinder; the second limiting ring is arranged in the spacing area between the first sleeve unit and the second sleeve unit; the abutment bead extends in a direction close to the second sleeve body away from the end of the first sleeve body.

[0013] In some embodiments, the first set unit also includes a first limiting ring; the side of the first limiting ring away from the central axis of the second set body is fixedly connected to the side of the first set body close to the second set unit; the first limiting ring is arranged at an end of the first set unit away from the connection between the first set unit and the nut or the piston cylinder; the first limiting ring is arranged in the spacing area between the first set unit and the second set unit.

[0014] In some embodiments, the gap between the abutment bead and the second sleeve is smaller than the gap between the second limiting ring and the first sleeve.

[0015] In some embodiments, the gap between the first limiting ring and the second sleeve is smaller than the gap between the second limiting ring and the first sleeve.

[0016] In some embodiments, the hardness of the first limiting ring is less than the hardness of the second limiting ring.

[0017] In some embodiments, the distance between the abutment bead and the second limiting ring is smaller than the distance between the abutment bead and the first limiting ring.

[0018] In order to solve the problem of easy wear between the piston barrel and the inner wall of the hydraulic cylinder, the present invention has the following advantages:

[0019] A transmission device is provided on the ball screw hydraulic device. The transmission device includes a first set of units, a second set of units and abutment beads. The first set of units and the second set of units are arranged at intervals, at least part of the abutment beads are embedded in the first set of units, and the abutment beads and the second set of units are arranged at intervals. At the same time, the nut and the piston cylinder are connected in a manner of end face abutment and radial spacing. When the nut and the piston cylinder are not concentric, the gap between the second set of units and the abutment beads allows the nut and the piston cylinder to have a certain range of movement, so that when the nut and the piston cylinder are not concentric, a certain correction can be made through the abutment beads, thereby reducing the wear between the piston cylinder and the inner wall of the hydraulic cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic diagram of a ball screw hydraulic device according to a first embodiment is shown;

[0021] Figure 2 A schematic diagram of a ball screw hydraulic device of a second embodiment is shown;

[0022] Figure 3 A partial schematic diagram of a ball screw hydraulic device of a first embodiment is shown;

[0023] Figure 4 A schematic diagram of a ball screw hydraulic device of a third embodiment is shown;

[0024] Figure 5 A partial schematic diagram of a ball screw hydraulic device of a second embodiment is shown.

[0025] Figure numerals: 01 driving assembly; 11 stator; 12 rotor; 13 screw rod; 14 nut; 15 guide ring; 02 transmission assembly; 21 first set of units; 211 first set of bodies; 212 limiting grooves; 213 first limiting rings; 22 second set of units; 221 second set of bodies; 222 second limiting rings; 23 abutting beads; 03 hydraulic assembly; 31 hydraulic cylinder; 32 piston cylinder. DETAILED DESCRIPTION

[0026] The present disclosure will now be discussed with reference to several exemplary embodiments. It should be understood that these embodiments are discussed only to enable those skilled in the art to better understand and thus implement the present disclosure, rather than implying any limitation on the scope of the present disclosure.

[0027] As used herein, the term "including" and its variants are to be interpreted as open-ended terms meaning "including but not limited to". The term "based on" is to be interpreted as "based at least in part on". The terms "one embodiment" and "an embodiment" are to be interpreted as "at least one embodiment". The term "another embodiment" is to be interpreted as "at least one other embodiment". The orientation or position relationship indicated by the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "vertical", "horizontal", "lateral", "longitudinal" and the like is based on the orientation or position relationship shown in the accompanying drawings. These terms are mainly for better describing the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation. In addition, in addition to being used to indicate an orientation or position relationship, some of the above terms may also be used to indicate other meanings, such as the term "upper" may also be used to indicate a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to the specific circumstances. In addition, the terms "install", "set", "provided with", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be an internal connection between two devices, elements or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances. In addition, the terms "first", "second", etc. are mainly used to distinguish different devices, elements or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance and quantity of the indicated devices, elements or components. Unless otherwise specified, "plurality" means two or more.

[0028] In this embodiment, vehicle braking is a key part to ensure driving safety. The motor drives the ball screw hydraulic device to brake the vehicle, so that the vehicle can respond quickly, greatly improving the safety of the vehicle. Figure 1As shown, the ball screw hydraulic device includes a drive component 01 and a hydraulic component 03. The drive component 01 includes a stator 11, a rotor 12, a screw 13, and a nut 14. The hydraulic component 03 includes a hydraulic cylinder 31 and a piston barrel 32. The nut 14 is driven to push the piston barrel 32 to compress the hydraulic oil in the hydraulic cylinder 31, thereby generating a braking force to brake the vehicle. However, when the ball screw hydraulic device is working, the connection between the nut 14 and the piston barrel 32 may not be concentric, thereby aggravating the wear between the piston barrel 32 and the inner wall of the hydraulic cylinder 31, and also affecting the braking effect of the ball screw hydraulic device. This embodiment provides a ball screw hydraulic device, such as Figure 2 As shown, the ball screw hydraulic device may include a drive assembly 01, a hydraulic assembly 03 and a transmission assembly 02. The drive assembly 01 may include a stator 11, a rotor 12, a screw 13 and a nut 14. The rotor 12 may be arranged in a hollow cavity of the stator 11, and the electromagnetic torque is converted into mechanical energy by the rotor 12, thereby driving the ball screw hydraulic device to work. The rotor 12 is detachably connected to the screw 13, so that the rotor 12 can drive the screw 13 to rotate. The nut 14 can be sleeved on the outer peripheral side of the screw 13, and the screw 13 can convert the rotational motion into linear motion through the roller, so that the nut 14 can move in a direction close to or away from the hydraulic cylinder 31. In other embodiments, the drive assembly 01 may also include a guide ring 15, which plays a certain guiding role on the nut 14.

[0029] The hydraulic assembly 03 may include a hydraulic cylinder 31 and a piston cylinder 32. At least part of the piston cylinder 32 is disposed in the hydraulic cylinder 31. The piston cylinder 32 is slidably connected to the hydraulic cylinder 31. Hydraulic oil may be disposed in the hydraulic cylinder 31, and the piston cylinder 32 is pushed by the driving screw nut 14 to compress the hydraulic oil in the hydraulic cylinder 31, so that the hydraulic oil can obtain hydraulic pressure, and through the sliding connection between the piston cylinder 32 and the hydraulic cylinder 31, the hydraulic pressure can push the piston cylinder 32 to move away from the hydraulic cylinder 31, thereby realizing the hydraulic push of the ball screw hydraulic device.

[0030] The transmission assembly 02 may include a first set of units 21, a second set of units 22, and abutment beads 23. The first set of units 21 may be sleeved on the outer peripheral side of the second set of units 22. The first set of units 21 and the second set of units 22 may be arranged at intervals. At least part of the abutment beads 23 is embedded in the first set of units 21. The abutment beads 23 and the second set of units 22 may be arranged at intervals, and the gap between the second set of units 22 and the abutment beads 23 allows a certain range of movement between the first set of units 21 and the second set of units 22. One end of one of the first set of units 21 and the second set of units 22 may be fixedly connected to the nut 14, and one end of the other may be fixedly connected to the piston cylinder 32, so that when the nut 14 and the piston cylinder 32 are not concentric, the position of the nut 14 and the piston cylinder 32 can be corrected to a certain extent by the abutment beads 23.

[0031] The ball screw hydraulic device may also include a pressurized state. The pressurized state may include the interaction between the stator 11 and the rotor 12 so that the rotor 12 rotates, the rotating rotor 12 may drive the screw 13 to rotate and drive the nut 14 to move in a direction close to the hydraulic cylinder 31, the hydraulic oil may be arranged in the hydraulic cylinder 31, the moving nut 14 may drive the piston cylinder 32 to move in a direction close to the hydraulic cylinder 31 through the transmission assembly 02 to reduce the cavity surrounded by the hydraulic cylinder 31 and the piston cylinder 32, so that the hydraulic oil in the cavity surrounded by the hydraulic cylinder 31 and the piston cylinder 32 can obtain hydraulic pressure, and the piston cylinder 32 is pushed to move in a direction away from the hydraulic cylinder 31 by the hydraulic pressure.

[0032] In this embodiment, if Figure 2 As shown, the nut 14 can be fixedly connected to the first set unit 21; the piston cylinder 32 can be fixedly connected to the second set unit 22. The ratio of the outer diameter of the piston cylinder 32 to the inner diameter of the nut 14 is less than or equal to a set value (for example, the set value can be 0.6~0.8). When the ratio of the outer diameter of the piston cylinder 32 to the inner diameter of the nut 14 is small, the nut 14 is fixedly connected to the first set unit 21, and the piston cylinder 32 is fixedly connected to the second set unit 22. At this time, as shown in FIG. Figure 3 As shown, the first set unit 21 can be set on the nut 14 at a position slightly away from the central axis of the nut 14, thereby increasing the distance between the first set unit 21 and the piston cylinder 32, so that the wall thickness of the first set unit 21 and the second set unit 22 can be increased, thereby improving the connection strength and stability of the first set unit 21 and the second set unit 22.

[0033] In this embodiment, if Figure 4 As shown, the piston cylinder 32 can be fixedly connected to the first set unit 21. The nut 14 can be fixedly connected to the second set unit 22. The ratio of the outer diameter of the piston cylinder 32 to the inner diameter of the nut 14 is greater than a set value (for example, the set value can be 0.6 to 0.8). When the ratio of the outer diameter of the piston cylinder 32 to the inner diameter of the nut 14 is large, the nut 14 is fixedly connected to the second set unit 22, and the piston cylinder 32 is fixedly connected to the first set unit 21. At this time, as shown in FIG. Figure 5 As shown, the first set unit 21 can be set on the piston cylinder 32 at a position slightly away from the central axis of the piston cylinder 32, thereby increasing the distance between the first set unit 21 and the nut 14, so that the wall thickness of the first set unit 21 and the second set unit 22 can be increased, thereby improving the connection strength and stability of the first set unit 21 and the second set unit 22.

[0034] In this embodiment, the first set unit 21 may include a first set body 211 and a limiting groove 212. A plurality of limiting grooves 212 may be evenly distributed on the first set body 211 along the circumference of the first set body 211, and the abutment bead 23 may be partially disposed in the limiting groove 212. The end of the abutment bead 23 away from the limiting groove 212 may extend toward the direction close to the second set unit 22. The abutment bead 23 is evenly distributed along the circumference of the first set body 211, so that the movable connection between the first set body 211 and the second set body 221 is smoother, and the force can be more evenly applied, so that the abutment bead 23 can correct the position of the nut 14 and the piston cylinder 32 to a certain extent while ensuring the normal operation of the piston cylinder 32 and the nut 14.

[0035] In this embodiment, the second set unit 22 may include a second set body 221 and a second limiting ring 222. The side of the second limiting ring 222 close to the central axis of the second set body 221 may be fixedly connected to the side of the second set body 221 close to the first set body 211. The second limiting ring 222 may be arranged at an end of the second set unit 22 away from the connection between the second set unit 22 and the nut 14 or the piston cylinder 32. The second limiting ring 222 may be arranged in the interval area between the first set unit 21 and the second set unit 22. The end of the abutment bead 23 away from the first set body 211 may extend in a direction close to the second set body 221. When the piston cylinder 32 is not concentric with the nut 14, the positions of the first set body 211 and the second set body 221 may be skewed, and the end of the first set body 211 close to the second limiting ring 222 may partially abut against the second limiting ring 222 to prevent the first set body 211 and the second set body 221 from further skewing. Some of the abutting beads 23 can abut against the second sleeve body 221 , and play a certain correction role on the first sleeve body 211 and the second sleeve body 221 , so as to prevent the normal working of the piston cylinder 32 and the nut 14 from being affected.

[0036] In this embodiment, the first set unit 21 may further include a first limiting ring 213. The side of the first limiting ring 213 away from the central axis of the second set body 221 may be fixedly connected to the side of the first set body 211 close to the second set unit 22. The first limiting ring 213 may be arranged at an end of the first set unit 21 away from the connection between the first set unit 21 and the nut 14 or the piston cylinder 32. The first limiting ring 213 may be arranged in the interval area between the first set unit 21 and the second set unit 22. When the piston cylinder 32 and the nut 14 are not concentric, resulting in excessive skewness between the first set body 211 and the second set body 221, the end of the first limiting ring 213 close to the second set body 221 may partially abut against the second set body 221, further limiting the position of the first set body 211 and the second set body 221, and preventing the skewness between the first set body 211 and the second set body 221 from increasing.

[0037] In this embodiment, if Figure 3As shown, the gap between the abutment bead 23 and the second sleeve 221 can be smaller than the gap between the second limiting ring 222 and the first sleeve 211. When the skew degree between the first sleeve 211 and the second sleeve 221 caused by the non-concentricity between the piston cylinder 32 and the nut 14 is small, the abutment bead 23 can be used to correct the position of the first sleeve 211 and the second sleeve 221, and the second limiting ring 222 abuts against the first sleeve 211. When the skew degree between the first sleeve 211 and the second sleeve 221 caused by the non-concentricity between the piston cylinder 32 and the nut 14 increases, the second limiting ring 222 abuts against the first sleeve 211 to prevent the skew degree between the first sleeve 211 and the second sleeve 221 from further increasing, so that the abutment bead 23 can correct the position of the first sleeve 211 and the second sleeve 221.

[0038] In this embodiment, if Figure 3 As shown, the gap between the first limiting ring 213 and the second sleeve 221 can be smaller than the gap between the second limiting ring 222 and the first sleeve 211. When the skew degree between the first sleeve 211 and the second sleeve 221 further increases due to the non-concentricity between the piston cylinder 32 and the nut 14, the second limiting ring 222 can abut against the first sleeve 211 to further prevent the skew degree between the first sleeve 211 and the second sleeve 221 from increasing.

[0039] In this embodiment, the hardness of the first limiting ring 213 may be less than that of the second limiting ring 222. When the first sleeve 211 and the second sleeve 221 are too skewed due to the non-concentricity between the piston cylinder 32 and the nut 14, the first limiting ring 213 may be slightly deformed so that the first limiting ring 213 can continue to play a limiting role, thereby preventing the first limiting ring 213 and the second sleeve 221 from being damaged at their abutment.

[0040] In this embodiment, if Figure 3 As shown, the distance between the abutting bead 23 and the second limiting ring 222 can be smaller than the distance between the abutting bead 23 and the first limiting ring 213. The larger distance between the first limiting ring 213 and the second limiting ring 222 increases the area of ​​the abutting portion of the first limiting ring 213 and the second limiting ring 222, thereby increasing the connection strength between the first limiting ring 213 and the second limiting ring 222. The small distance between the abutment bead 23 and the second limiting ring 222 allows the second limiting ring 222 and the abutment bead 23 to quickly abut against each other when the hydraulic brake fails, so that the nut 14 can drive the piston cylinder 32 to move away from the hydraulic cylinder 31, thereby avoiding that the distance between the second limiting ring 222 and the abutment bead 23 is too large, resulting in a large speed difference between the nut 14 and the piston cylinder 32, which makes the impact force on the abutment point between the second limiting ring 222 and the abutment bead 23 too large when the second limiting ring 222 and the abutment bead 23 abut, causing damage to the second limiting ring 222 and the abutment bead 23.

[0041] Those skilled in the art will appreciate that the above-mentioned embodiments are specific examples for implementing the present disclosure, and in actual applications, various changes may be made thereto in form and detail without departing from the scope of the present disclosure.

Claims

1. A ball screw hydraulic device, characterized in that: The ball screw hydraulic device comprises: A driving assembly, the driving assembly comprising a stator, a rotor, a screw rod and a nut; the rotor is arranged in a hollow cavity of the stator; the rotor is detachably connected to the screw rod; the nut is sleeved on the outer peripheral side of the screw rod; A hydraulic assembly, the hydraulic assembly comprising a hydraulic cylinder and a piston barrel; at least a portion of the piston barrel is disposed in the hydraulic cylinder; the piston barrel is slidably connected to the hydraulic cylinder; A transmission assembly, the transmission assembly comprising a first set unit, a second set unit, and abutment beads; the first set unit is sleeved on the outer peripheral side of the second set unit; the first set unit and the second set unit are arranged at intervals; at least part of the abutment beads are embedded in the first set unit; the abutment beads and the second set unit are arranged at intervals; one end of the first set unit and the second set unit is fixedly connected to the nut, and one end of the other is fixedly connected to the piston cylinder; The ball screw hydraulic device also includes a pressurized state; the pressurized state includes the interaction between the stator and the rotor causing the rotor to rotate, the rotating rotor drives the screw to rotate and drive the nut to move toward the direction close to the hydraulic cylinder, and the moving nut drives the piston cylinder to move toward the direction close to the hydraulic cylinder through the transmission assembly to reduce the cavity surrounded by the hydraulic cylinder and the piston cylinder.

2. A ball screw hydraulic device according to claim 1, characterized in that: The nut is fixedly connected to the first set unit; the piston cylinder is fixedly connected to the second set unit; and the ratio of the outer diameter of the piston cylinder to the inner diameter of the nut is less than or equal to a set value.

3. A ball screw hydraulic device according to claim 1, characterized in that: The piston cylinder is fixedly connected to the first set unit; the nut is fixedly connected to the second set unit; and the ratio of the outer diameter of the piston cylinder to the inner diameter of the nut is greater than a set value.

4. A ball screw hydraulic device according to claim 1, characterized in that: The first set unit includes a first set body and a limiting groove; a plurality of the limiting grooves are evenly distributed on the first set body along the circumference of the first set body; the abutment bead is partially arranged in the limiting groove; the abutment bead extends away from one end of the limiting groove toward the direction close to the second set unit.

5. A ball screw hydraulic device according to claim 4, characterized in that: The second set unit includes a second set body and a second limiting ring; the side of the second limiting ring close to the central axis of the second set body is fixedly connected to the side of the second set body close to the first set body; the second limiting ring is arranged at an end of the second set unit away from the connection between the second set unit and the nut or the piston cylinder; the second limiting ring is arranged in the spacing area between the first set unit and the second set unit; the abutment bead extends in a direction close to the second set body away from the end of the first set body.

6. A ball screw hydraulic device according to claim 5, characterized in that: The first set unit also includes a first limiting ring; the side of the first limiting ring away from the central axis of the second set body is fixedly connected to the side of the first set body close to the second set unit; the first limiting ring is arranged at an end of the first set unit away from the connection between the first set unit and the nut or the piston cylinder; the first limiting ring is arranged in the spacing area between the first set unit and the second set unit.

7. A ball screw hydraulic device according to claim 6, characterized in that: The gap between the abutting bead and the second sleeve body is smaller than the gap between the second limiting ring and the first sleeve body.

8. A ball screw hydraulic device according to claim 6, characterized in that: The gap between the first limiting ring and the second sleeve is smaller than the gap between the second limiting ring and the first sleeve.

9. A ball screw hydraulic device according to claim 8, characterized in that: The hardness of the first limiting ring is smaller than the hardness of the second limiting ring.

10. A ball screw hydraulic device according to claim 6, characterized in that: The distance between the abutting bead and the second limiting ring is smaller than the distance between the abutting bead and the first limiting ring.

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