KR100194729B1 - Shift Actuator System for Electric Vehicles - Google Patents

Abstract

In order to realize an automatic shift of a two-speed transmission for an electric vehicle, the present invention provides a shift mechanism of a transmission, a sensing means for detecting whether a gear is engaged with the transmission mechanism, a shift operation means, and a rotation direction by the shift operation means. Provided is a shift actuator system for an electric vehicle comprising a motor for rotating and stopping in response to a signal of the sensing means, and a transfer means for moving the transmission mechanism by the motor, the system being simple and easy to detach. And economic advantages.

Description

Battery Shift Actuator System

The present invention relates to a shift actuator system for an electric vehicle, and more particularly, to an electric vehicle shift actuator system for automatically operating a transmission mechanism such as a shift fork of a semi-automatic transmission.

Electric vehicles are considered to be the next-generation vehicles considering pollution and energy problems due to exhaust gas, but the development of electric transmissions for electric vehicles is still insufficient, and currently, existing five-speed manual transmissions or automatic transmissions are used. have.

However, in the case of a five-speed manual transmission, it is unnecessarily multistage, heavy and bulky, and in the case of an automatic transmission, it is very disadvantageous in terms of efficiency in an electric vehicle using limited energy because of a torque converter.

Therefore, in consideration of the motor characteristics of the electric vehicle, two-stage gears are sufficient, and since a torque converter is not necessary, development of an electric vehicle-specific two-speed transmission is required in consideration of driving convenience, light weight, and low cost.

In response to the above demand, Korean Patent Application Publication No. 94-13931 (Applicant: Hyundai Motor Co., Ltd.), for example, proposes a manual transmission for an electric vehicle with a 2 forward speed and 1 reverse speed.

As shown in FIG. 1, the transmission is equipped with a first speed gear 11 and a second speed gear 12 on a primary shaft 2 that rotates like a motor, and a sub shaft 3 ( secondary shaft), the first and second speed gears 13 and 14 meshed with the gears 11 and 12, respectively, and the gear shift is performed by the first and second speed gears 11 and 12. This is realized by the synchronization device 10 therebetween.

However, this patent discloses a technique focused on realizing a reverse shift, and does not have a device for realizing an automatic shift capable of automatically moving the shift mechanism, and still relies on a manual shift device by a shift lever.

Therefore, a shift actuator system is required to realize automatic shift, and if such a device is realized, it can be defined as a semi-automatic transmission for an electric vehicle.

On the other hand, there is a case in which the hydraulic actuator is used to implement semi-automatic in the existing internal combustion engine vehicle, the hydraulic actuator has a disadvantage that the configuration of the hydraulic pump, cylinder, tank, etc. is essentially complicated system.

The present invention has been made in view of the above-mentioned request and problems of the prior art, and an object of the present invention is a simple structure for applying to a two-speed transmission for an electric vehicle, low production cost and easy to install and remove the electric vehicle It is to provide a shift actuator system.

1 is a configuration diagram schematically showing a conventional manual transmission for an electric vehicle,

2 is a block diagram showing an embodiment of an electric vehicle shift actuator system according to the present invention,

3 is a configuration diagram showing another embodiment of an electric vehicle shift actuator system according to the present invention.

* Explanation of symbols for main parts of the drawings

50: motor 60: rod

61: ball screw 62: shifting switch

100: transmission mechanism 102: shift fork

105: 1 speed sensor 106: 2 speed sensor

108: neutral detection sensor 110: system controller

In order to achieve the above object, the present invention provides a transmission mechanism, a sensing means for detecting whether a gear is engaged with the transmission mechanism, a shift operation means, and a rotation direction by the shift operation means and rotates according to a signal of the sensing means. And a motor that stops and stops, and a transfer means for moving the transmission mechanism by the motor.

According to the present invention having the configuration as described above, when the shifting operation means is shifted from neutral to 1 speed, the motor driven by the power is rotated, and the rotation of the motor is transmitted to the moving means, and the moving means operates the shift mechanism to 1 speed To engage the gear.

At this time, the sensing means, considering that the shifting mechanism has been moved enough to make one speed shift, stops the conveying means by sending a signal to the motor so that it is no longer rotated.

On the other hand, in the case of operating the shift operation means to shift from the first speed to the second speed, the motor rotates in reverse by the operation of the shift operation means to achieve the second speed shift by moving the transmission mechanism by the transfer means.

At this time, the sensing means that detects that the transmission mechanism has been moved enough to make a two-speed transmission sends a signal to stop the rotation means by no longer rotating.

On the other hand, if neutral is selected at the 1st speed or the 2nd speed, the motor rotates the transmission mechanism in the direction to be separated from the 1st and 2nd speed gears, and puts a conveying means in a neutral position.

EXAMPLE

Hereinafter, with reference to the accompanying drawings, an embodiment of a shift actuator system for an electric vehicle according to the present invention.

2 is a configuration diagram showing a first embodiment of the present invention, wherein the transmission is a two-speed transmission, and the transmission mechanism 100 is located on a secondary shaft 90, which is an output shaft, and the transmission mechanism 100 is a synchro. In the case of the Niger type, the shift fork 102 and the synchronizing are generally included. In the case of the selection gear type, the shift fork is included.

In the present embodiment, the means for transferring the transmission mechanism 100 includes a rod 60 coupled to the shift fork 102 of the transmission mechanism 100 and a ball screw 61 screwed to the rod 60. ), The ball skew 61 is rotated by the motor 50, the motor 50 is driven by the power source (40).

The motor 50 may be rotated forward and reverse by, for example, a shift switch 62. The transmission mechanism 100 is provided with a sensor 105 that senses a engagement state of the transmission mechanism 100. It is.

Since the sensor 105 is configured to send a signal to the system controller 110 connected to the motor 50 by detecting that the engagement of the transmission mechanism 100 is 1 speed or neutral or 2 speed, it is defined herein as a shift sensor.

The system controller is a component that acts as an electronic control unit of the internal combustion engine and senses the motor system and sends various warning signals or other signals to the driver.

On the other hand, in the electric vehicle, since the battery E is a key problem related to the mileage and the total weight of the vehicle, careful selection must be made for the selection of the new motors 50 and 51, but as in the present embodiment, the transmission The minimum power supply is sufficient to rotate the ball skew 61 for conveying the sphere 100, for example, using an auxiliary power supply of 12V (volt).

Reference numeral '80' is a transmission drive motor shaft, and '82' and '83' are first speed gears and second speed gears, respectively, and '84' and '85' are the first speed gears 82 and The 1st speed gear and the 2nd speed gear meshed with the 2nd speed gear 83, and 51 refer to the main shaft motor which rotates the main shaft 81. As shown in FIG.

Referring to the operation of the shift actuator system of the present embodiment configured as described above, the ball skew 61 rotated by the motor 50 is rotated in series with the axis of the motor 50, the ball skew 61 By the rotation of the rod 60 coupled to the transmission mechanism 100 is moved along the minor axis 90.

In more detail, when the shifting switch 62 selects the 1st speed, the motor 50 is rotated so that the rod 60 moves to the right side (the 1st gear 82 side), thereby shifting the shifting mechanism 100 to 1. Coupling with the short gear 84 performs one speed shift. At this time, the shift sensor 109 detects that the first speed gear 84 and the subordinate shaft 90 are engaged, and sends a signal to the system controller 110, and the system controller 110 receives the signal and receives the signal from the motor 50 ( 51) Stop.

In addition, when shifting from the first speed to the second speed, when the motor 50 is rotated in reverse to move the rod 60 toward the second speed gear 85 on the left side, the transmission mechanism 100 moves toward the second speed gear 85. When the transmission mechanism 100 is coupled to the second gear 85, the shift sensor 109 detects this and sends a signal to the controller system 110 to stop the motors 50 and 51.

In the case of shifting to the neutral speed, the transmission mechanism 100 coupled with the first speed gear 84 or the second speed gear 85 moves toward the second speed gear 85 or the first speed gear 84, respectively. The sensor 109 detects this and sends a signal to the system controller 100 to stop the motors 50 and 51 to stop the operation of the shift actuator of the present embodiment.

On the other hand, when reversing, the rotational direction of the motor 51 of the main shaft 80 is reversed, and when the reverse shift is set at 1 speed, the shift actuator system of the present embodiment may be operated as in the 1 speed shift.

3 shows a second embodiment of the shift actuator system according to the present invention. The same parts as those of the first embodiment will be described with the same reference numerals, and the overlapping parts will be omitted.

This embodiment differs from the first embodiment in that the present invention is a modification of the sensing means. In the first embodiment, the sensing means of the present invention employs the shift sensor 109 and the system controller 110. In the example, a sensor having a built-in switch that is turned on / off according to the position of the transmission mechanism 100 is adopted.

That is, the first speed sensor 105 is connected to a portion where the first speed gear 84 and the subordinate shaft 90 are engaged to output an electrical signal to the system controller 110 when the first speed gear shifts, and the second speed detection switch. (106) is connected to the position where the second gear 85 and the secondary shaft is engaged to output an electrical signal when the second gear is shifted, and the neutral shift sensor 108 connected to the neutral position of the center of the secondary shaft to shift the neutral Can be output as an electrical signal.

The shifting switch 62 is connected to the same portion as the position shown in the first embodiment.

First, if the gear shift switch 62 is to be shifted to 1 speed, 2 speed and neutral, the motor 50 is driven by the power input from the shift switch 62 so that the rod 60 is right (1 gear). (84)) or left (two-speed gear (85) side) to shift the transmission mechanism 100 to the first gear (84) to perform a single speed shift or to the second gear (85) By combining, two speed shifts are performed.

In this case, the first speed sensor 105 and the second speed sensor 106 detect the detected signal when the first speed gear 84 and the second speed gear 85 are engaged with the auxiliary shaft 90, and then detect the detected signal. The system controller 110 receives this signal to stop the motors 50 and 51.

On the other hand, when shifting to neutral, the shifting mechanism 100 coupled with the 1st speed gear 84 or the 2nd speed gear 85 moves toward the 2nd speed gear 85 or the 1st speed gear 84, respectively, and realizes neutrality. The neutral detection sensor 108 detects this and sends a signal to the system controller 100 to stop the motors 50 and 51 to stop the operation of the shift actuator of the present embodiment.

In addition, as another embodiment, the rod 60 and the ball skew 61 of the first embodiment may be integrated and the ball skew 61 may be moved to the inside of the shaft of the motor 50.

While some examples have been presented according to the spirit of the invention in the above embodiments, it will be appreciated by those skilled in the art that other variations are possible.

For example, the present invention can be applied to a transmission mechanism using a simultaneous engagement type or a selection gear type, or a transmission in which a transmission mechanism is mounted on a main shaft. However, such modifications fall within the protection scope of the present invention. Will be clarified by the scope of

The shift actuator of the transmission for an electric vehicle according to the present invention configured as described above is simpler and more economical than the conventional hydraulic actuator in order to implement auto shift in an internal combustion engine vehicle.

In addition, there is an advantage that it is easy to remove and install because of using a small capacity motor and moving means.

Claims (7)

A transmission mechanism of the transmission, sensing means for detecting whether the gear mechanism is engaged with the transmission mechanism, a shift operation means, and a motor which rotates and stops according to a signal of the sensing means, the rotation direction being changed by the shift operation means; And a transfer means for moving the transmission mechanism by the motor. 2. The shift actuator system according to claim 1, wherein the transmission mechanism is a synchronous engagement mechanism including a shift fork and a phase synchronizer. The shift actuator system according to claim 1, wherein the transmission mechanism is a shift fork (102) used in a select gear type transmission. 2. The actuator system according to claim 1, wherein the sensing means includes a sensor for detecting a position of the transmission mechanism and a system controller for stopping the motor in response to the sensor signal. The shift actuator system of claim 1, wherein the sensing unit is a switch that detects a position of the transmission mechanism and cuts off power of the motor when the shift is completed. The shift actuator system according to claim 1, wherein the conveying means comprises a ball skew that rotates like a motor, and a rod screwed to the ball screw and coupled to the transmission mechanism. The shift actuator system according to claim 1, wherein the conveying means comprises a ball skew conveyed according to the rotation of the motor, and a rod integrally coupled to the ball skew and coupled to the transmission mechanism.