Electrically-driven screw transmission gear shifting executing mechanism

Abstract

The utility model provides an electrically-driven screw transmission gear shifting executing mechanism which comprises a motor, a gear shifting mechanism, a gear shifting mechanism, a gear shifting mechanism, a gear shifting mechanism, a gear shifting mechanism, a gear shifting mechanism, a gear shifting mechanism and a gear shifting mechanism. The motor comprises a motor rotor, a motor stator and a motor shaft, the motor rotor sleeves the motor shaft, and the motor shaft synchronously rotates along with the motor rotor; the control unit is connected with the motor stator and inputs an electric signal to the motor stator so as to drive the motor rotor to rotate; the screw rod assembly comprises a screw rod and a poking finger, the poking finger is arranged on the screw rod in a sleeving mode, and the poking finger is matched with the screw rod through threads so that rotation of the screw rod can be converted into linear reciprocating motion of the poking finger along the screw rod; and the gear pair is used for connecting the screw rod with the motor shaft in a transmission manner, so that the rotation of the motor shaft is converted into the rotation of the screw rod. Compared with the prior art, the gear shifting speed is high, the precision is high, the noise is low, the energy efficiency is reduced, the installation is convenient, the application range is wide, the vehicle performance is improved, and the driving and riding comfort is considered at the same time.

Description

Technical field

[0001] The utility model relates to the technical field of vehicle speed change, in particular to an electric drive screw transmission shift execution mechanism. [Background Technology]

[0002] Traditional commercial vehicle shift actuators use compressed air as their power source. Pneumatic systems cannot precisely control shift points and timing, resulting in poor control of the vehicle assembly and shifting, and a poor driving experience for the driver. Traditional commercial vehicle shift actuators use compressed air as their power source. Due to the inherent inflation time and compression ratio of pneumatic air, response time is long and shifting delays are significant. Traditional commercial vehicle shift actuators rely on compressed air systems, resulting in high energy consumption, large space requirements for pneumatic mechanisms, and high maintenance costs. Traditional commercial vehicle shift actuators use compressed air as their power source, requiring complex starting piping and compressed air supply systems, making them difficult to design and install. Traditional commercial vehicle shift actuators use compressed air as their power source, but during the inflation and deflation processes, the compression and exhaust of gas produces significant noise and vibration. Traditional commercial vehicle shift actuators use pneumatic systems, which can fail due to air compression in low temperatures or at high altitudes.

[0003] Therefore, it is necessary to propose an improved technical solution to solve the above problems. [Utility Model Content]

[0004] One of the purposes of the utility model is to provide an electric-driven screw transmission shift actuator, which adopts the method of motor-driven screw, gets rid of the dependence of commercial vehicle actuators on vehicle-mounted air sources, achieves fast shifting speed, high precision, low noise, reduced energy efficiency, easy installation, wide range of applications, and improves 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, and 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, 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 existing technology, the utility model adopts the method of motor-driven screw, which gets rid of the dependence of commercial vehicle actuators on the on-board air source, achieves fast shifting speed, high precision, low noise, reduced energy efficiency, easy installation, wide range of applications, 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 those skilled in the art, other drawings can be obtained based on these drawings without inventive work. Among them:

[0008] Figure 1 This is a cross-sectional view of an electrically driven screw transmission shift actuator in one embodiment of the present utility model;

[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 is shown;

[0011] Figure 4 In one embodiment of the present invention, Figure 1 An exploded schematic diagram of the motor and control unit is 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 is shown;

[0013] Figure 6 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 shown;

[0014] Figure 7 In one embodiment of the present invention, Figure 1 A cross-sectional view of the motor area 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 buckle structure area of the 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 implementation methods.

[0017] The term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments. Unless otherwise specified, the terms "coupled," "connected," "connected," and "connected" used herein to indicate electrical connection refer to direct or indirect connection. For example, "A and B are connected" 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 "upper", "lower", "front", "back", "front", "back", "left", "right", "vertical", "perpendicular", "horizontal", "top", "bottom", "inside", "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 device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot 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, the present invention is as follows in one embodiment Figure 1 The cross-sectional view of the screw assembly area of the electric screw drive shift actuator shown; please refer to Figure 3 As shown, the present invention is as follows in one embodiment Figure 1 A cross-sectional view of a motor for an electrically driven screw transmission shift actuator is shown.

[0021] like Figures 1 to 3 As shown, motor 110 includes a motor rotor 111, a motor stator 112, and a motor shaft 113. Stator 112 is disposed around rotor 111. Rotor 111 is sleeved onto shaft 113, and shaft 113 rotates synchronously with rotor 111. A control unit 120 is connected to stator 112. Control unit 120 receives control instructions from a transmission controller (not shown) to input electrical signals to stator 112. Changes in the magnetic field within stator 112 drive rotor 111 to rotate, thereby driving rotor 111 to rotate about a central axis. Screw assembly 130 includes a screw 131 and a shift finger 132. The shift finger 132 is sleeved onto screw 131 and threadedly engages with screw 131 to convert the rotation of screw 131 into linear reciprocating motion of the shift finger 132 along screw 131. The gear pair 140 is disposed between the screw 131 and the motor shaft 113. The gear pair 140 is used to provide a transmission connection between 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 employs a conventional gear pair structure, which is well known to those skilled in the art and will not be described in detail herein.

[0022] In a specific embodiment of the present invention, the control unit 120 is integrated into the controller, which is highly integrated; the transmission controller can 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 a signal from 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 shift finger 132 through threaded transmission.

[0023] exist Figure 1 and Figure 2In the illustrated embodiment, the electrically driven screw transmission shift actuator provided by the present invention further includes a housing 150. The motor 110, screw assembly 130, and gear pair 140 are housed in a cavity 152 defined within the housing 150. A channel 154 is formed within the cavity 152 for linear reciprocating motion of the shift finger 132. The shift finger 132 is anti-twistably disposed within the channel 154. The purpose of the anti-twistably disposed portion of the shift finger 132 within the channel 154 is to restrict the shift finger 132 to linear reciprocating motion along the screw 131.

[0024] exist Figure 1 and Figure 2 In the embodiment shown, the control unit 120 is arranged on the housing 150, and the control unit 120 is fixedly connected to the housing 150, for example, by bolts. The control unit 120 is welded to the motor stator 112 through three leads and transmits energy. 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, the present invention is as follows in one embodiment Figure 1 Exploded diagram of the motor and control unit shown.

[0025] Please refer to Figure 5 As shown, it is the utility model in one embodiment as 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 the utility model in one embodiment as Figure 1 The cross-sectional view of the finger area of the electric drive screw transmission shift actuator is shown. Figure 5 and Figure 6 In the illustrated embodiment, the channel 154 in the housing 150 provides guidance by restricting the radial freedom of the finger 132 via a plane, thereby limiting the finger 132 to linear reciprocating motion along the screw 131. Excessive operation of the finger 132 can lead to severe wear. Therefore, an oil reservoir 160 is provided in both the finger 132 and the channel 154 for storing oil. The design of the oil reservoir 160 ensures that grease is always present between the finger 132 and the channel 154, thereby reducing wear of the finger 150 during operation.

[0026] Please continue to refer to Figure 2 As shown, Figure 2The screw assembly 130 shown also includes a thrust washer 133, a thrust bearing 135, a bushing insert 134, and a bearing bushing 136. The bearing bushing 136 is located at the end of the screw 131 connected to the gear pair 140 and is fixedly connected to the housing 150 through an interference fit. The gear pair 140 is disposed in the space defined by the bearing bushing 136. The thrust bearing 135 is sleeved on the screw 131 to support the screw 131 and is located between a stop 1312 of the screw 131 and the bearing bushing 136. The thrust washer 133 abuts between the stop 1312 of the screw 131 and the thrust bearing 135, as well as 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. This design prevents axial movement of the screw 131. also, Figure 1 and Figure 2 The electrically driven screw transmission shift actuator shown further includes a snap ring 180 , which is clamped between the bearing bushing 136 and the motor 110 . The screw 131 can be axially limited by the snap 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 is shown with an oil drain hole 156 , which passes through the side wall of the housing 150 and is in communication 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 3The 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 around one end of the motor shaft 113 extending beyond the motor rotor 111, and the second bearing 117 is sleeved around the other end of the motor shaft 113 extending beyond the motor rotor 111. The first bearing seat 114 is fixed to the housing 150 and disposed radially around the first bearing 116. The first bearing 116 is radially supported by the first bearing seat 114. The second bearing seat 115 is fixed to the housing 150 and disposed radially around the second bearing 117. The second bearing 117 is radially supported by the second bearing seat 115. The end of the motor shaft 113 extending beyond the motor rotor 111 is adjacent to the gear pair 140, and the other end of the motor shaft 113 extending beyond the motor rotor 111 is adjacent to the control unit 120. That is, the motor rotor 111 and the motor shaft 113 are supported and rotated by the 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, ensuring 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 errors 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 effectively provide 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, the present invention is as follows in one embodiment Figure 1 A cross-sectional view of the motor area of an electrically driven screw-driven 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 filling port 158 passes through the side wall of the housing 150. The position of the glue filling port 158 corresponds to the position of the motor 110, and the glue filling port 158 is connected to the area where the motor 110 is located in the cavity 152. In addition, a snap structure 119 is designed on the first bearing seat 114. The first bearing seat 114 is clamped to the housing 150 through the snap structure 119. For details, please refer to Figure 8 As shown, the present invention is as follows in one embodiment 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 controlling the axial displacement of the dial 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 dial finger 132 through software to perform precise control. Figure 1 In the illustrated embodiment, 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, which has 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 utility model limits radial rotation by the cooperation between the plane of the housing 150 and the plane of the finger 132, and then lubricates the grease through the oil storage grooves 160 on both sides, thereby reducing friction and greatly increasing its durability.

[0035] The present invention ensures the concentricity of the motor shaft 113 through the support of dual 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 through 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 electric drive screw transmission shift actuator provided by the utility model has the following beneficial effects:

[0037] 1. The electric-driven screw-driven shift actuator provided by the utility model can provide higher shifting accuracy and better control performance. The electric-driven screw-driven shift actuator can more accurately control the shift point and shift time through thread 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 utility model 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 driver's driving experience.

[0039] 3. The electric-driven screw-driven shift actuator system provided by this utility model is more energy-efficient because it does not rely on a compressed air system, reducing energy loss. Furthermore, the electric-driven screw-driven shift actuator provided by this utility model has lower maintenance costs 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 existing vehicle systems.

[0041] 5. The electric drive screw transmission shift actuator provided by this utility model is quieter because it does not have the compressed air release noise and vibration common in pneumatic shift systems. The screw 131 transmission is basically noise and vibration free.

[0042] 6. The electric drive screw transmission shift actuator provided by the utility model 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 depart 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 aforementioned specific embodiments.

Claims

1. An electrically driven screw transmission shift actuator, 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 engages with the screw through a thread to convert the rotation of the screw into a linear reciprocating motion of the finger along the screw; A gear pair is provided between the screw and the motor shaft, and is used to drive and connect the screw and the motor shaft, thereby converting the rotation of the motor shaft into the rotation of the screw.

2. The electrically driven screw transmission shift actuator according to claim 1, characterized in that: It also includes a housing, The motor, screw assembly and gear pair are housed in a cavity defined within 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, characterized in that: The control unit is integrated into the controller; The control unit is arranged on the housing and is fixedly connected to the housing.

4. The electrically driven screw transmission shift actuator according to claim 2, characterized in that: It also includes an oil storage tank, The oil storage tank is provided in both 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, characterized in that: The screw assembly further comprises: a bearing bushing located at one end of the screw connected to the gear pair, the bearing bushing being fixedly connected to the housing, and the gear pair being disposed in a space defined within the bearing bushing; a thrust bearing, which is sleeved on the screw and located between a stop portion of the screw and the bearing bushing; a thrust washer abutting between the stop portion 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, characterized in that It also includes a snap ring, The snap ring is clamped between the bearing bushing and the motor.

7. The electrically driven screw transmission shift actuator according to claim 2, 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 is sleeved on one end of the motor shaft extending from the motor rotor, and the second bearing is sleeved on 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 on the periphery of the first bearing in a radial direction of the first bearing, and the first bearing is supported in the first bearing seat in a radial direction; The second bearing seat is fixed in the housing, the second bearing seat is arranged on 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 from the motor rotor is adjacent to the gear pair, and the other end of the motor shaft extending from the motor rotor is adjacent to the control unit.

8. The electrically driven screw transmission shift actuator according to claim 7, 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; providing 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, characterized in that: The shell is provided with a glue filling port, which passes through 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 snap-fit structure is provided on the first bearing seat, and the first bearing seat is clamped to the housing through the snap-fit structure; and / or The housing is provided with an oil drain hole, which passes through the side wall of the housing and is communicated with the cavity in the housing to discharge the oil accumulated in the cavity.

10. The electrically driven screw transmission shift actuator according to claim 2, characterized in that: It also includes a magnetic ring assembly, The magnetic ring assembly is fixedly connected to the motor shaft. The magnetic ring assembly transmits the rotation angle information of the motor shaft to the control unit through a 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 dial finger.

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