CN111649123A - An AMT Selector Shift Actuator - Google Patents

Abstract

The invention discloses an AMT gear selection and shifting actuator, which is characterized in that it comprises: a gear selection mechanism, a gear shifting mechanism and a gear selection and shifting head (30), the gear selection mechanism comprises a gear selection motor (4) and A trapezoidal screw (14), the shifting mechanism includes a shifting motor (25) and a ball screw (19), the gear selection motor (4) and the shifting motor (25) are respectively connected through the trapezoidal screw (14) The transmission with the ball screw (19) drives the gear selector (30) to complete gear selection and shifting. The movement of the AMT gear selection and shift actuator is completed by the ball screw pair and the trapezoidal screw pair, which have high precision, so as to ensure that the assembly has high movement precision and action sensitivity, and meets the timeliness and accuracy of gear selection and shifting. . The AMT selector shift actuator has a buffer mechanism, and can also have the function of position monitoring and real-time feedback to the ECU.

Description

An AMT Selector Shift Actuator

technical field

The invention relates to a gear selection and shifting actuator of a commercial vehicle, in particular to an AMT gear selection and shifting actuator.

Background technique

With the development of social economy, commercial vehicles have become an indispensable means of transportation and transportation in people's daily life. Existing commercial vehicles are equipped with transmissions, and the transmissions in the transmission have been developed for a long time, resulting in manual transmission (MT), hydraulic automatic transmission (AT), and electronically controlled mechanical automatic transmission (AMT).

As the earliest technology, manual transmission MT is very mature. Its advantages lie in its low price, mature technology, low fuel consumption, and low maintenance costs, etc. However, since the road conditions encountered by the vehicle during driving are not static, it requires the driver to continuously manipulate the selection of gears and the driving operation. High strength; in addition, inaccurate and untimely shifting of gears will greatly increase fuel consumption and poor economy. Therefore, the development of an automatic shift selection came into being.

In the subsequent development, the hydraulic automatic transmission AT has emerged, but compared with the manual transmission, although it is more convenient to operate, it is less adaptable to the environment, easy to leak, and it improves efficiency. Not big, maintenance is more difficult, and the cost is high.

On the basis of the first two technologies, the electronic control mechanical automatic transmission AMT changes the power source of the gearbox to electronic control, and its comfort, timeliness, environmental protection and economy have been greatly improved.

As an electronically controlled mechanical automatic transmission, a variety of AMT selector and shift actuators have been developed at present, but the currently developed structure is mainly based on deceleration and torque increase. When the clearance increases, the transmission efficiency will become lower and lower, which greatly reduces the timeliness, accuracy and service life of the actuator.

SUMMARY OF THE INVENTION

In view of the above problems, the present invention provides the following AMT gear selection and shifting actuator, which completes the gear selection operation through the trapezoidal screw mechanism and the gear shifting operation through the ball screw mechanism, so that the entire transmission efficiency is high and the response is timely.

Specifically, the present invention provides an AMT shift selection actuator, which is characterized in that it includes: a shift mechanism, a shift mechanism, and a shift selector head 30 , and the shift mechanism includes a shift motor 4 and a shift selector head 30 . Trapezoidal screw 14, the shifting mechanism includes a shifting motor 25 and a ball screw 19, the gear selection motor 4 and the shifting motor 25 are respectively transmitted through the trapezoidal screw 14 and the ball screw 19 to drive the shift selection dial 30 Complete gear selection and shifting.

Preferably, the AMT gear selection and shift actuator of the present invention is characterized in that the gear selection mechanism includes a gear selection motor 4, a coupling 6, a trapezoidal screw 14, and a nut 15, and the trapezoidal screw 14 passes through The coupling 6 is axially connected with the gear selection motor 4, and the nut 15 and the trapezoidal screw 14 are screwed together to convert the rotary motion into linear motion. Drive the linear motion to complete the gear selection.

Preferably, the AMT gear selection and shift actuator according to the present invention is characterized in that a thrust needle bearing and a washer assembly 5 are installed between the coupling 6 and the gear selection motor 4 as buffer components.

Preferably, the AMT shift selection and shift actuator of the present invention is characterized in that the shift mechanism includes a shift motor 25, a coupling 23, a ball screw 19, a nut 20, a shift shaft push arm 22, And the shift shaft 26, the ball screw 19 is axially connected with the shift motor 25 through the coupling 23, the ball screw 19 and the nut 20 are rotated and cooperated to convert the rotary motion into linear motion, and the cylindrical protrusion of the nut 20 Snap into the groove of the shift shaft push arm 22 to convert the linear motion into rotational motion. The shift shaft push arm 22 and the shift shaft 26 are welded together, and the middle spline part of the shift shaft 26 is connected to the shift selector dial 30 In cooperation, the shift selector dial 30 is driven to rotate to complete the shift.

Preferably, the AMT shift selection and shift actuator according to the present invention is characterized in that a thrust needle bearing and a washer assembly 24 are installed between the coupling 23 and the shift motor 25 as buffer components.

Preferably, the AMT shift actuator of the present invention is characterized in that one end of the ball screw 19 is connected to the shift motor 25 through the deep groove ball bearing 18 and the coupling 23, and the other end is connected to the shift motor 25 through the deep groove ball bearing. 18. The coupling 17 is matched with the housing 16, and a thrust needle roller bearing and a washer assembly 5 are installed between the coupling 17 and the housing 16 as a buffer component.

Preferably, the feature of the AMT shift selection and shift actuator according to the present invention is that the shift mechanism further includes a shift angle sensor 1 . A cylindrical pin 21 is inserted on the shift shaft push arm 22 , and the other end of the cylindrical pin 21 is inserted into the corner rod of the shift angle sensor 1 to monitor the angle change of the shift selector dial 30 .

Preferably, the characteristic of the AMT gear selection and shift actuator according to the present invention is that the gear selection mechanism further includes a gear selection angle sensor 2 . The gear selector head 30 is matched with the sliding dial 33 through the slot, the sliding dial 33 is inserted with a cylindrical pin 34, and the other end of the cylindrical pin 34 is inserted into the corner rod of the gear selection angle sensor 2, and the monitoring is performed. The displacement of the selector knob 30 changes.

Preferably, the AMT shift selection and shift actuator according to the present invention is characterized in that it further has a position monitoring device, and the position monitoring device sends the shift angle sensor 1 and/or a The angular displacement traveled by the angle rod of the gear selection angle sensor 2 is converted into an output voltage and fed back to the ECU, thereby obtaining the current position information of the gear selection.

A commercial vehicle is provided with the above-mentioned AMT shift selector actuator.

The above-mentioned technical scheme of the present invention has the following advantages compared with the prior art:

First, the movement of the AMT gear selection and shift actuator is completed by the ball screw pair and the trapezoidal screw pair, which have high precision, so as to ensure that the assembly has high movement precision and action sensitivity, and meets the timeliness of gear selection and shifting. and accuracy.

Second, the AMT selector shift actuator has a buffer mechanism. There are thrust needle roller bearings and gasket assemblies between the coupling 6 and the motor 4, the coupling 23 and the motor 25, and the coupling 17 and the housing 16, which can make the screw pair generate the electric motor driven by the motor. The huge axial force is buffered, so as to achieve the purpose of protecting the components and greatly guarantee the life of the assembly.

Thirdly, the AMT shift selection and shift actuator can also have position monitoring and real-time feedback to the ECU function.

Description of drawings

In order to illustrate the technical solutions in the specific embodiments of the present invention more clearly, the following will briefly introduce the accompanying drawings used in the specific embodiments. Obviously, the accompanying drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained from these drawings without any creative effort.

FIG. 1 is a top view of the AMT shift selector actuator mechanism of the present invention.

FIG. 2 is a front view of the AMT shift selector actuator mechanism of the present invention.

FIG. 3 is a cross-sectional view taken along line A-A in FIG. 1 .

FIG. 4 is a view from the direction B in FIG. 1 .

The reference numbers in the figure are indicated as:

1: Shift angle sensor; 2: Shift angle sensor; 3: Cover plate; 4: Shift motor; 5: Thrust needle roller bearing and gasket assembly; 6: Coupling; 7: Spring; 8: Waterproof plug Component; 9: Oil seal; 10: Retaining ring for hole; 11: Bushing; 12: Oil seal support ring; 13: O-ring; 14: Lead screw; 15: Nut; 16: Housing; 17: Coupling 18: Deep groove ball bearing; 19: Ball screw; 20: Nut; 21: Cylindrical pin; 22: Shift shaft push arm; 23: Coupling; 24: Thrust needle roller bearing and gasket assembly; 25 : Shifting motor; 26: Shifting shaft; 27: Oil seal; 28: Bushing; 29: Cylindrical pin; 30: Selecting shift dial; 31: Bushing; 32: Steel ball; 33: Sliding dial; 34: Cylindrical pin.

Detailed ways

The content of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are a part of the embodiments of the present invention, but not all of the embodiments. The embodiments in the present invention and other embodiments obtained by those of ordinary skill in the art without creative work all belong to the protection scope of the present invention.

Structure description:

FIG. 1 is a top view of the AMT shift selector actuator mechanism of the present invention. FIG. 2 is a front view of the AMT shift selector actuator mechanism of the present invention. FIG. 3 is a cross-sectional view taken along line A-A in FIG. 1 . FIG. 4 is a view from the direction B in FIG. 1 .

As shown in FIGS. 1-4 , the gear selection mechanism includes a gear selection motor 4 , a coupling 6 , a trapezoidal screw 14 , and a nut 15 . The lead screw 14 is axially connected to the gear selector motor 4 via the coupling 6 . The screw assembly between the nut 15 and the trapezoidal lead screw 14 converts the rotary motion into linear motion. The gear selection dial 30 is combined with the nut 15 through the slot, and is driven by the nut 15 to perform linear motion to complete the gear selection.

The gear selector motor 4 can be fixed on the housing 16 by means of bolts. The other end of the trapezoidal screw 14 can be pressed against the steel ball 32 to form an axial assembly limit. In one embodiment, the gear selection mechanism is further provided with an oil seal support ring 12 together with the bushing 11 as a guide for the trapezoidal screw 14 . In addition, the O-ring 13 and the oil seal 9 form a seal inside the housing 16 to block the oil splashed from the outside, and finally use the circlip 10 for holes to fix the oil seal support ring.

In addition, in one embodiment, a thrust needle bearing and a spacer assembly 5 are mounted between the coupling 6 and the gear selector motor 4 as a buffer member. An intermediate spring 7 is mounted between the coupling 6 and the lead screw 14 as an element of the calibration part.

In a preferred embodiment, the gear selection mechanism further includes a gear selection angle sensor 2 . The gear selector head 30 is matched with the sliding dial 33 through the slot, the sliding dial 33 is inserted with a cylindrical pin 34, and the other end of the cylindrical pin 34 is inserted into the corner rod of the gear selection angle sensor 2, and the monitoring is performed. The displacement of the selector knob 30 changes.

As shown in FIGS. 1-4 , the shift mechanism includes a shift motor 25 , a coupling 23 , a ball screw 19 , a nut 20 , a shift shaft push arm 22 , and a shift shaft 26 . The ball screw 19 is axially connected to the shifting motor 25 via a coupling 23 . The ball screw 19 and the nut 20 are rotatably matched to convert the rotary motion into linear motion. The cylindrical protrusion of the nut 20 is snapped into the groove of the shift shaft push arm 22 to convert the linear motion into rotational motion. The shift shaft push arm 22 and the shift shaft 26 are welded together, and the middle spline part of the shift shaft 26 is matched with the shift selector head 30 to drive the shift selector head 30 to rotate to complete the shift.

The shift motor 25 can also be fastened to the housing 16 by means of screws. One end of the ball screw 19 is connected to the shift motor 25 through the deep groove ball bearing 18 and the coupling 23 , and the other end is matched with the housing 16 through the deep groove ball bearing 18 and the coupling 17 . Both ends of the shift shaft 26 are sleeved with bushings 28 and 31, which are installed in the housing 16, are limited by cylindrical pins 29, and are sealed by oil seals 27 to block the oil splashed from the outside.

In addition, in one embodiment, a thrust needle bearing and a washer assembly 24 are installed between the coupling 23 and the shift motor 25 as a buffer member. In addition, a thrust needle bearing and spacer assembly 5 are attached as buffer members between the coupling 17 and the housing 16 .

In a preferred embodiment, the shift mechanism further includes a shift angle sensor 1 . A cylindrical pin 21 is inserted on the shift shaft push arm 22 , and the other end of the cylindrical pin 21 is inserted into the corner rod of the shift angle sensor 1 to monitor the angle change of the shift selector dial 30 .

In addition, the casing 16 is provided with a cover plate 3 for sealing, and the waterproof plug assembly 8 performs waterproof sealing on the casing 16 and the cover plate 3 .

The working principle of the AMT selection and shifting actuator of the present invention is as follows:

In the first step, the gear selector motor 4 and the gear shift motor 25 are activated through the command switch.

In the second step, the gear selection motor 4 drives the coupling 6, the coupling 6 drives the trapezoidal lead screw 14, converts the rotary motion into linear motion, and drives the nut 15 to change the displacement, thereby driving the shift selector 30 to make a straight line movement to achieve the gear selection action.

In the third step, at the same time, the shift selector head 30 drives the sliding dial 33 to move in a straight line, and the cylindrical pin 34 is driven by the sliding dial 33 to drive the angle rod of the selector angle sensor 2 to rotate. The output signal of the sensor 2 can feed back the signal of the gear selection position to the ECU.

In the fourth step, the shift motor 25 drives the coupling 23, the coupling 23 drives the ball screw 19, converts the rotary motion into linear motion, drives the nut 17 to change the displacement, and the protruding cylinder is stuck on the shift shaft to push. In the groove of the arm 22, the linear motion is converted into a rotary motion, which drives the shift shaft push arm 22 to rotate, and the shift shaft 26 welded together with the shift shaft push arm 22 rotates along with it, which drives the shift selector dial 30 to also rotate. Follow the rotation to realize the shifting action.

In the fifth step, at the same time, the cylindrical pin on the shift shaft push arm 22 drives the angle rod of the shift angle sensor 1 to rotate. At this time, the output signal of the angle sensor 1 can feedback the signal of the shift position to the ECU.

Preferably, the AMT shift selection and shift actuator also has a position monitoring device to realize a position monitoring function. The position monitoring device converts the angular displacement traveled by the corner rod of the rotation angle sensor (shift angle sensor 1, gear selection angle sensor 2) into an output voltage and feeds it back to the ECU when the assembly is selected or shifted. Get the current position information of the selected gear.

The above-described AMT shift selector actuator of the present invention can be used in various motor vehicles such as commercial vehicles.

The advantages of the AMT selection and shifting actuator disclosed by the present invention are as follows:

First, the movement of the AMT gear selection and shift actuator is completed by the ball screw pair and the trapezoidal screw pair, which have high precision, so as to ensure that the assembly has high movement precision and action sensitivity, and meets the timeliness of gear selection and shifting. and accuracy.

Second, the AMT selector shift actuator has a buffer mechanism. There are thrust needle roller bearings and gasket assemblies between the coupling 6 and the motor 4, the coupling 23 and the motor 25, and the coupling 17 and the housing 16, which can make the screw pair generate the electric motor driven by the motor. The huge axial force is buffered, so as to achieve the purpose of protecting the components and greatly guarantee the life of the assembly.

Thirdly, the AMT shift selector can also have the function of position monitoring and real-time feedback to the ECU.

Obviously, the above-mentioned embodiments are only examples for clear description, and are not intended to limit the implementation manner. For those of ordinary skill in the art, changes or modifications in other different forms can also be made on the basis of the above description. There is no need and cannot be exhaustive of all implementations here. And the obvious changes or changes derived from this are still within the protection scope of the present invention.

Claims (10)

1. An AMT gear selection and shift actuator, characterized in that it comprises: a gear selection mechanism, a gear shifting mechanism and a gear selection dial (30), the gear selection mechanism comprising a gear selection motor (4) and a trapezoidal wire A lever (14), the shifting mechanism includes a shifting motor (25) and a ball screw (19), the gear selection motor (4) and the shifting motor (25) are respectively connected by a trapezoidal screw (14) and a ball screw The transmission of the lead screw (19) drives the selection and shift dial (30) to complete the selection and shifting of gears. 2 . The AMT gear selection and shift actuator according to claim 1 , wherein the gear selection mechanism comprises a gear selection motor ( 4 ), a coupling ( 6 ), a trapezoidal screw ( 14 ), and a nut ( 2 . 15), the lead screw (14) is axially connected with the gear selection motor (4) through the coupling (6), and the nut (15) and the lead screw (14) are screwed together to convert the rotary motion into a straight line To move, the gear selection dial (30) is combined with the nut (15) through the card slot, and is driven by the nut (15) to perform linear motion to complete the gear selection. 3. The AMT gear selection and shifting actuator according to claim 1, characterized in that, between the coupling (6) and the gear selection motor (4), a thrust needle roller bearing and a gasket assembly ( 5). 4. The AMT shift selection and shift actuator according to claim 1, wherein the shift mechanism comprises a shift motor (25), a coupling (23), a ball screw (19), a nut (20) ), the shift shaft push arm (22), and the shift shaft (26), the ball screw (19) is axially connected with the shift motor (25) through the coupling (23), and the ball screw (19) It rotates and cooperates with the nut (20) to convert the rotary motion into linear motion, and the cylindrical protrusion of the nut (20) is inserted into the groove of the shift shaft push arm (22) to convert the linear motion into rotational motion, and the shift shaft pushes The arm (22) and the shift shaft (26) are welded together, and the middle spline part of the shift shaft (26) is matched with the selector and shift dial (30) to drive the selector and shift dial (30) to rotate, complete Shift. 5. The AMT shift selection and shift actuator according to claim 4, wherein a thrust needle roller bearing and a gasket assembly (24) are installed between the coupling (23) and the shift motor (25) as buffer components ). 6. The AMT shift selection and shift actuator according to claim 4 or 5, wherein one end of the ball screw (19) passes through a deep groove ball bearing (18), a coupling (23) and a shift motor ( 25) Connection, the other end is matched with the shell (16) through the deep groove ball bearing (18) and the coupling (17), and a buffer part is installed between the coupling (17) and the shell (16). Thrust needle roller bearing and gasket assembly (5). 7. The AMT shift selection and shift actuator according to claim 1, characterized in that the shift mechanism further comprises a shift angle sensor (1), and a cylindrical pin (21) is inserted on the shift shaft push arm (22), The other end of the cylindrical pin (21) is inserted into the angle rod of the shift angle sensor (1) to monitor the angle change of the shift selector dial (30). 8 . The AMT gear selection and shift actuator according to claim 1 , wherein the gear selection mechanism further comprises a gear selection angle sensor ( 2 ), between the gear selection dial ( 30 ) and the sliding dial ( 33 ). 9 . Through the matching of the card slots, a cylindrical pin (34) is inserted into the sliding dial (33), and the other end of the cylindrical pin (34) is inserted into the corner rod of the gear selection angle sensor (2) to monitor the gear selection dial. (30) displacement variation. 9. The AMT shift selection and shift actuator according to claim 7 or 8, characterized in that it also has a position monitoring device, which, when the assembly selects or shifts gears, changes the shift angle sensor ( 1) and/or the angular displacement traveled by the angle rod of the gear selection angle sensor (2) is converted into an output voltage and fed back to the ECU, thereby obtaining the current position information of the gear selection. 10. A commercial vehicle having the AMT shift selector actuator according to any one of claims 1-9.

Images