Electrically-driven screw transmission gear shifting executing mechanism
By driving the screw transmission gear shift actuator by motor drives, the problem of traditional commercial vehicle gear shift actuators relying on compressed air is solved, and faster and more accurate gear shifting, lower energy efficiency and quieter operation is achieved, suitable for a variety of environments condition.
Patent Information
- Application Number
- CN202411567728.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-05
- Publication Date
- 2024-12-17
AI Technical Summary
Traditional commercial vehicle gear shift actuators rely on compressed aerodynamic power sources, resulting in slow gear shifting speed, poor accuracy, high noise, high energy consumption, high maintenance costs, and failure in low temperature or high altitude environments.
The motor drive screw transmission shift actuator is adopted to realize electric drive shifting through the combination of motor, control unit, screw assembly and gear pair, break away from the dependence on compressed air, improve shifting speed and accuracy, and reduce noise and energy consumption.
Faster shifting speeds, higher accuracy, lower energy efficiency, quieter operation, reduce maintenance costs and operate normally under a wide range of environmental conditions, improving vehicle performance and driving comfort.
Smart Images
Figure CN119146196A_ABST
Abstract
Description
[Technical field]
[0001] The invention relates to the technical field of vehicle speed change, and in particular to an electrically driven screw transmission shift actuator. [Background technology]
[0002] Traditional commercial vehicle shift actuators use compressed air as a power source. The pneumatic method cannot accurately control the shift point and shift time, and the control of the vehicle assembly and shifting is poor, and the driver's driving experience is poor. Traditional commercial vehicle shift actuators use compressed air as a power source. Due to the inflation time of pneumatics and the compression ratio of the gas itself, the response time is long and the shift delay is large. Traditional commercial vehicle shift actuators use compressed air as a power source and rely on the compressed air system. The energy consumption is large, and the pneumatic mechanism layout space is large, and the maintenance cost is high. Traditional commercial vehicle shift actuators use compressed air as a power source, which requires the layout of complex starting pipelines and compressed air supply systems, and the design and installation are difficult. Traditional commercial vehicle shift actuators use compressed air as a power source. During the inflation and deflation process, the noise and vibration are relatively large when the gas is compressed and discharged. The pneumatic system used in traditional commercial vehicle shift actuators will fail due to air compression under low temperature conditions or high altitude environments.
[0003] Therefore, it is necessary to propose an improved technical solution to solve the above problems. [Summary of the invention]
[0004] One of the purposes of the present invention is to provide an electrically driven screw transmission shift actuator, which adopts a motor-driven screw to get rid of the commercial vehicle actuator's dependence on the vehicle-mounted air source, achieve fast shifting speed, high precision, low noise, reduced energy efficiency, convenient installation, wide range of applications, and improve vehicle performance while taking into account driving and riding comfort.
[0005] According to one aspect of the present invention, the present invention provides an electrically driven screw transmission shift actuator, which includes: a motor, which includes a motor rotor, a motor stator and a motor shaft, wherein the motor stator is arranged on the periphery of the motor rotor; the motor rotor is sleeved on the motor shaft, and the motor shaft rotates synchronously with the motor rotor; a control unit is connected to the motor stator, and the control unit inputs an electrical signal to the motor stator, thereby driving the motor rotor to rotate around a central axis; a screw assembly, which includes a screw and a shift finger, wherein the shift finger is sleeved on the screw, and the shift finger and the screw are threadedly matched to convert the rotation of the screw into a linear reciprocating motion of the shift finger along the screw; a gear pair is arranged between the screw and the motor shaft, and the gear pair is used to drive the screw and the motor shaft to be connected, thereby converting the rotation of the motor shaft into the rotation of the screw.
[0006] Compared with the prior art, the present invention adopts the method of using a motor to drive the screw, which gets rid of the commercial vehicle actuator's dependence on the on-board air source, achieves fast shifting speed, high precision, low noise, reduced energy efficiency, convenient installation, wide application range, and improves vehicle performance while taking into account driving and riding comfort.
Brief Description of the Drawings
[0007] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them:
[0008] Figure 1 A cross-sectional view of an electrically driven screw transmission shift actuator in one embodiment of the present invention;
[0009] Figure 2 In one embodiment of the present invention, Figure 1 A cross-sectional view of the screw assembly area of the electrically driven screw transmission shift actuator shown;
[0010] Figure 3 In one embodiment of the present invention, Figure 1 A cross-sectional view of a motor of an electrically driven screw transmission shift actuator shown;
[0011] Figure 4 In one embodiment of the present invention, Figure 1 An exploded schematic diagram of the motor and control unit shown;
[0012] Figure 5 In one embodiment of the present invention, Figure 1 A cross-sectional view of the finger region of the electrically driven screw transmission shift actuator along the radial direction of the screw shown;
[0013] Figure 6 In one embodiment of the present invention, Figure 1 A cross-sectional view of the finger area of the electrically driven screw transmission shift actuator shown;
[0014] Figure 7 In one embodiment of the present invention, Figure 1 A cross-sectional view of the motor region of the electrically driven screw transmission shift actuator shown;
[0015] Figure 8 In one embodiment of the present invention, Figure 1 A cross-sectional view of the snap-fit structure area of an electrically driven screw transmission shift actuator is shown. [Specific implementation method]
[0016] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.
[0017] The "one embodiment" or "embodiment" referred to herein refers to a specific feature, structure or characteristic that may be included in at least one implementation of the present invention. The "in one embodiment" that appears in different places in this specification does not all refer to the same embodiment, nor is it a separate or selective embodiment that is mutually exclusive with other embodiments. Unless otherwise specified, the words "coupled", "connected", "connected" and "connected" in this document that indicate electrical connection all mean direct or indirect connection. For example, A is connected to B, which includes both direct electrical connection between A and B and connection between A and B through electrical components or circuits.
[0018] In the description of the present invention, it should be understood that the terms "up", "down", "front", "back", "front", "back", "left", "right", "vertical", "perpendicular", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.
[0019] Please refer to Figure 1 As shown, it is a cross-sectional view of an electrically driven screw transmission shift actuator in one embodiment of the present invention. Figure 1 The electrically driven screw transmission shift actuator shown includes a motor 110 , a control unit 120 , a screw assembly 130 and a gear pair 140 .
[0020] Please refer to Figure 2 As shown, it is the present invention in one embodiment as Figure 1 A cross-sectional view of the screw assembly area of an electrically driven screw drive shift actuator is shown; refer to Figure 3 As shown, it is the present invention in one embodiment as Figure 1 A cross-sectional view of a motor of an electrically driven screw transmission shift actuator is shown.
[0021] like Figures 1 to 3As shown, the motor 110 includes a motor rotor 111, a motor stator 112 and a motor shaft 113. The motor stator 112 is arranged on the periphery of the motor rotor 111. The motor rotor 111 is sleeved on the motor shaft 113, and the motor shaft 113 rotates synchronously with the motor rotor 111. The control unit 120 is connected to the motor stator 112. The control unit 120 receives a control instruction output by a gearbox controller (not shown) to input an electrical signal to the motor stator 112. The change of the magnetic field in the motor stator 112 drives the rotation of the motor rotor 111, thereby driving the motor rotor 111 to rotate around a central axis. The screw assembly 130 includes a screw 131 and a finger 132. The finger 132 is sleeved on the screw 131. The finger 132 and the screw 131 are matched by threads to convert the rotation of the screw 131 into a linear reciprocating motion of the finger 132 along the screw 131. The gear pair 140 is disposed between the screw 131 and the motor shaft 113, and is used to drive the screw 131 and the motor shaft 113, thereby converting the rotation of the motor shaft 113 into the rotation of the screw 131. The gear pair 140 adopts a gear pair structure in the prior art, which is a technical content well known to those skilled in the art, and will not be described in detail here.
[0022] In a specific embodiment of the present invention, the control unit 120 is integrated in the controller, and the integration is high; the transmission controller may be a TCU (Telematics Control Unit). Figure 1 The specific description of the action of the electrically driven screw transmission shift actuator shown is as follows: when the controller 120 receives the signal of the transmission controller TCU, the controller 120 drives the motor rotor 111 and the motor shaft 113 to rotate; the motor shaft 113 and the screw 131 are gear-driven through the gear pair 140 to convert the rotational motion of the motor shaft 113 into the rotational motion of the screw 131; the screw 131 converts the rotational motion of the screw 131 into the linear motion of the finger 132 through threaded transmission.
[0023] exist Figure 1 and Figure 2 In the illustrated embodiment, the electric drive screw transmission gear shift actuator provided by the present invention further includes a housing 150, the motor 110, the screw assembly 130 and the gear pair 140 are accommodated in a cavity 152 defined in the housing 150, a channel 154 is formed in the cavity 152 for the finger 132 to perform linear reciprocating motion, and the finger 132 is anti-twistably arranged in the channel 154. The purpose of the finger 132 being anti-twistably arranged in the channel 154 is to limit the finger 132 to perform linear reciprocating motion only along the screw 131.
[0024] exist Figure 1 and Figure 2In the illustrated embodiment, the control unit 120 is arranged on the housing 150, and the control unit 120 is fixedly connected to the housing 150, for example, the control unit 120 is fixed to the housing 150 by bolts, the control unit 120 is welded and connected to the motor stator 112 by three leads and transmits energy, and the control unit 120 transmits a signal to control the rotation of the motor rotor 111, thereby driving the motor shaft 113 to rotate. For details, please refer to Figure 4 As shown, it is the present invention in one embodiment as Figure 1 Exploded schematic diagram of the motor and control unit shown.
[0025] Please refer to Figure 5 As shown, it is an embodiment of the present invention. Figure 1 The cross-sectional view of the finger area of the electric drive screw transmission shift actuator along the screw radial direction is shown. Figure 6 As shown, it is an embodiment of the present invention. Figure 1 A cross-sectional view of the finger area of an electrically driven screw transmission shift actuator is shown. Figure 5 and Figure 6 In the illustrated embodiment, the channel 154 in the housing 150 limits the freedom of the finger 132 in the radial direction thereof by a plane, and guides the finger 132 so as to limit the finger 132 to linear reciprocating motion along the screw 131. Excessive operation of the finger 132 may lead to severe wear, so an oil storage tank 160 is provided in the finger 132 and the channel 154 for storing oil. The design of the oil storage tank 160 can ensure that grease is always present between the finger 132 and the channel 154, so as to reduce the wear of the finger 150 during operation.
[0026] Please continue to refer to Figure 2 As shown, Figure 2 The screw assembly 130 shown further includes a thrust washer 133, a thrust bearing 135, a bushing insert 134, and a bearing bushing 136, wherein the bearing bushing 136 is located at one end of the screw 131 connected to the gear pair 140, and the bearing bushing 136 is fixedly connected to the housing 150 through interference fit; the gear pair 140 is arranged in a space defined in the bearing bushing 136; the thrust bearing 135 is sleeved on the screw 131 to support the screw 131, and the thrust bearing 135 is located between the stopper 1312 of the screw 131 and the bearing bushing 136; the thrust washer 133 abuts between the stopper 1312 of the screw 131 and the thrust bearing 135, and between the thrust bearing 135 and the bearing bushing 136; the bushing insert 134 is located between the thrust bearing 135 and the thrust washer 133. Such a design can prevent the axial movement of the screw 131. also, Figure 1 and Figure 2The electrically driven screw transmission gear shift actuator shown further includes a retaining ring 180 , which is clamped between the bearing bushing 136 and the motor 110 , and the screw 131 can be axially limited by the retaining ring 180 .
[0027] Since the electric drive screw transmission shift actuator provided by the present invention is in the gearbox, it will be affected by the splashing gearbox oil, causing the oil to accumulate in the cavity 152 in the housing 150. Figure 2 The housing 150 shown is provided with an oil drain hole 156 , which penetrates the side wall of the housing 150 and is communicated with the cavity 152 in the housing 150 to drain the oil accumulated in the cavity 152 .
[0028] Please continue to refer to Figure 1 and Figure 3 As shown, Figure 3 The motor 110 shown further includes a first bearing seat 114, a second bearing seat 115, a first bearing 116 and a second bearing 117. The first bearing 116 is sleeved on one end of the motor shaft 113 extending from the motor rotor 111, and the second bearing 117 is sleeved on the other end of the motor shaft 113 extending from the motor rotor 111; the first bearing seat 114 is fixed in the housing 150, and the first bearing seat 114 is arranged at the periphery of the first bearing 116 along the radial direction of the first bearing 116, and the first bearing 116 is supported in the first bearing seat 114 in the radial direction; the second bearing seat 115 is fixed in the housing 150, and the second bearing seat 115 is arranged at the periphery of the second bearing 117 along the radial direction of the second bearing 117, and the second bearing 117 is supported in the second bearing seat 115 in the radial direction; the one end of the motor shaft 113 extending from the motor rotor 111 is adjacent to the gear pair 140, and the other end of the motor shaft 113 extending from the motor rotor 111 is adjacent to the control unit 120. That is to say, the motor rotor 111 and the motor shaft 113 are supported and rotated by two bearings 116 and 117 , and the outer diameters of the bearings 116 and 117 match with the bearing seats 114 and 115 .
[0029] exist Figure 3 In the embodiment shown, the first bearing seat 114 and the second bearing seat 115 are also used to fix the motor stator 112 to ensure that the motor rotor 111 and the motor stator 112 remain coaxial and move relative to each other under the action of the magnetic field. Due to the manufacturing error of the first bearing seat 114 and the second bearing seat 115, there is a large tolerance between the first bearing seat 114 and the first bearing 116, and the motor shaft 113 is adjacent to the other end of the control unit 120 (i.e. Figure 3 The right end of the motor shaft 113 shown in the figure has no limit position, and there is a risk of loosening due to long-term vibration. Therefore, a spring wave pad 118 is added between the first bearing seat 114 and the first bearing 116 to offset the vibration and provide effective support to ensure the stability of the structure.
[0030] The motor 110 is pressed into the housing 150 by press fitting. Since the positions of the motor 110 and the control unit 120 are unique, an eccentric circle 1152 is designed on the second bearing seat 115 away from the control unit 120. If the angular position is not accurate, it cannot be installed in place, thus ensuring the uniqueness of the assembly. Specifically, the inner edge of the second bearing seat 115 is designed as an eccentric circle. For details, please refer to Figure 7 As shown, it is the present invention in one embodiment as Figure 1 A cross-sectional view of the motor area of an electrically driven screw gear shift actuator is shown.
[0031] After the motor 110 is pressed into place, the axial movement is limited to one position. The motor 110 will move to the other side after being vibrated. Therefore, a glue injection port 158 is designed on the housing 150 to fix the motor 110 by injecting glue. For details, please refer to Figure 7 As shown, the glue injection port 158 penetrates the side wall of the housing 150, the position of the glue injection port 158 corresponds to the position of the motor 110, and the glue injection port 158 is connected to the area where the motor 110 is located in the cavity 152. In addition, a buckle structure 119 is designed on the first bearing seat 114, and the first bearing seat 114 is clamped with the housing 150 through the buckle structure 119. For details, please refer to Figure 8 As shown, it is the present invention in one embodiment as Figure 1 The cross-sectional view of the buckle structure area of the electric drive screw transmission shift actuator shown in FIG. In this way, the motor 110 is fixed by double limiting to ensure the firmness and stability of the mechanical mechanism.
[0032] Figure 1 The electric drive screw transmission shift actuator shown also includes a magnetic ring assembly 170, which is fixedly connected to the motor shaft 113. The magnetic ring assembly 170 transmits the rotation angle information of the motor shaft 113 to the control unit 120 through the magnetic field. The control unit 120 controls the rotation angle of the motor shaft 113 based on the rotation angle information, thereby achieving the control of the axial displacement of the finger 132. Specifically, when the motor shaft 113 rotates under the action of the motor rotor 111 and the motor stator 112, the magnetic ring assembly 170 transmits the rotation angle information of the motor shaft 113 to the chip in the control unit 120 through the magnetic field. The chip adjusts the position of the finger 132 through software to perform precise control. Figure 1 In the specific embodiment shown, the induction magnetic ring 170 is fixedly connected to one end of the motor shaft 113 close to the control unit 120 .
[0033] In summary, the present invention directly drives the finger 132 to move by rotating the screw 131, with high transmission efficiency. The concentricity is ensured by the dual support of the bearing 134 and the housing 150, and the axial direction is limited by the bearing bushing 136 and the retaining ring 180 to ensure its stability.
[0034] The present invention limits radial rotation by cooperating between the plane of the housing 150 and the plane of the finger 132, and then lubricates the grease through the oil storage tanks 160 on both sides, thereby reducing friction and greatly increasing its durability.
[0035] The present invention ensures the concentricity of the motor shaft 113 by supporting the double bearings 116 and 117, and eliminates the axial clearance of the motor shaft 113 and the axial deviation that may be caused by long-term movement by the spring wave washer 118, thereby ensuring the stability of the mechanism; the present invention ensures the uniqueness of the assembly by designing an eccentric circle in the second bearing seat 115, so that the magnetic field angle of the motor 110 is unique; the design of the glue filling port 158 and the buckle 119 can make the motor 110 more securely fixed and cope with more different harsh working conditions without failure.
[0036] In summary, the electrically driven screw transmission shift actuator provided by the present invention has the following beneficial effects:
[0037] 1. The electric-driven screw transmission shift actuator provided by the present invention can provide higher shifting accuracy and better control performance. The electric-driven screw transmission shift actuator can more accurately control the shift point and shift time through threaded transmission, thereby improving the efficiency of the transmission system and the driving experience of the vehicle.
[0038] 2. The electric-driven screw transmission shift actuator provided by the present invention sets a suitable reduction ratio for the motor shaft 113 and the screw 131 through the gear pair 140, has a faster response speed, is more stable, and the shifting process can be completed more quickly, reducing the shifting delay and improving the dynamic performance of the vehicle and the driving experience of the driver.
[0039] 3. The electric drive screw transmission shift actuator system provided by the present invention has higher energy efficiency, it does not rely on the compressed air system, and reduces energy loss. At the same time, the maintenance cost of the electric drive screw transmission shift actuator provided by the present invention is lower because it has fewer components and is more reliable.
[0040] 4. The electrically driven screw transmission shift actuator provided by the present invention is easier to install and integrate into the existing vehicle system.
[0041] 5. The electrically driven screw transmission gear shift actuators provided by the present invention are quieter because they do not have the compressed air release noise and vibration common in pneumatic gear shift systems. The screw 131 transmission adopted is basically free of noise and vibration.
[0042] 6. The electric drive screw transmission shift actuator provided by the present invention can work normally at high altitudes and temperatures ranging from -40°C to 130°C.
[0043] It should be noted that any changes made by those skilled in the art to the specific embodiments of the present invention do not deviate from the scope of the claims of the present invention. Accordingly, the scope of the claims of the present invention is not limited to the above specific embodiments.
Claims
1. An electrically driven screw transmission gear shift actuator, It is characterized in that It includes: A motor, comprising a motor rotor, a motor stator and a motor shaft, wherein the motor stator is arranged on the periphery of the motor rotor; the motor rotor is sleeved on the motor shaft, and the motor shaft rotates synchronously with the motor rotor; A control unit connected to the motor stator, the control unit inputting an electrical signal to the motor stator, thereby driving the motor rotor to rotate around a central axis; A screw assembly, comprising a screw and a finger, wherein the finger is sleeved on the screw, and the finger and the screw are matched through threads to convert the rotation of the screw into a linear reciprocating motion of the finger along the screw; A gear pair is arranged between the screw and the motor shaft, and the gear pair is used to drive and connect the screw and the motor shaft, so as to convert the rotation of the motor shaft into the rotation of the screw.
2. The electrically driven screw transmission shift actuator according to claim 1, It is characterized in that It also includes a housing, The motor, screw assembly and gear pair are accommodated in a cavity defined in the housing; A channel is formed in the cavity for the finger to perform linear reciprocating motion, and the finger is arranged in the channel to resist torsion.
3. The electrically driven screw transmission shift actuator according to claim 2, It is characterized in that The control unit is integrated in the controller; The control unit is arranged on the housing, and the control unit is fixedly connected to the housing.
4. The electrically driven screw transmission shift actuator according to claim 2, It is characterized in that It also includes an oil storage tank, The oil storage tank is provided in the finger and the channel; Grease is stored in the oil storage tank to ensure that the grease is stored between the finger and the channel.
5. The electrically driven screw transmission shift actuator according to claim 2, It is characterized in that The screw assembly also includes: A bearing bushing, which is located at one end of the screw rod connected to the gear pair, and the bearing bushing is fixedly connected to the housing, and the gear pair is arranged in a space defined in the bearing bushing; A thrust bearing, which is sleeved on the screw, and the thrust bearing is located between the stopper portion of the screw and the bearing bushing; a thrust washer abutting between the stopper of the screw and the thrust bearing, and abutting between the thrust bearing and the bearing bushing; A bushing insert is located between the thrust bearing and the thrust washer.
6. The electrically driven screw transmission shift actuator according to claim 5, Features It also includes a snap ring, The retaining ring is clamped between the bearing bushing and the motor.
7. The electrically driven screw transmission shift actuator according to claim 2, It is characterized in that The motor further comprises a first bearing seat, a second bearing seat, a first bearing and a second bearing, The first bearing sleeve is arranged at one end of the motor shaft extending from the motor rotor, and the second bearing sleeve is arranged at the other end of the motor shaft extending from the motor rotor; The first bearing seat is fixed in the housing, the first bearing seat is arranged at the periphery of the first bearing in the radial direction of the first bearing, and the first bearing is supported in the first bearing seat in the radial direction; The second bearing seat is fixed in the housing, the second bearing seat is arranged at the periphery of the second bearing in the radial direction of the second bearing, and the second bearing is supported in the second bearing seat in the radial direction; One end of the motor shaft extending out of the motor rotor is adjacent to the gear pair, and the other end of the motor shaft extending out of the motor rotor is adjacent to the control unit.
8. The electrically driven screw transmission shift actuator according to claim 7, It is characterized in that The first bearing seat and the second bearing seat are also used to fix the motor stator to ensure that the motor rotor and the motor stator remain coaxial; Disposing a spring wave washer between the first bearing seat and the first bearing; and / or The inner edge of the second bearing seat is designed as an eccentric circle.
9. The electrically driven screw transmission shift actuator according to claim 7, It is characterized in that The shell is provided with a glue filling port, the glue filling port penetrates the side wall of the shell, the position of the glue filling port corresponds to the position of the motor, and the glue filling port is connected to the area where the motor is located in the cavity; A buckle structure is provided on the first bearing seat, and the first bearing seat is clamped with the housing through the buckle structure; and / or The shell is provided with an oil drain hole, which penetrates through the side wall of the shell and is communicated with the cavity in the shell to discharge the oil accumulated in the cavity.
10. The electrically driven screw transmission shift actuator according to claim 2, It is characterized in that It also includes a magnetic ring assembly, The magnetic ring assembly is fixedly connected to the motor shaft, and the magnetic ring assembly transmits the rotation angle information of the motor shaft to the control unit through the magnetic field. The control unit controls the rotation angle of the motor shaft based on the rotation angle information, thereby controlling the axial displacement of the finger.