Vehicle speed change apparatus

Patent metadata

Field	Value
Publication number	US-9739373-B2
Application number	US-201314394560-A
Country	US
Kind code	B2
Filing date	May 16, 2013
Priority date	May 23, 2012
Publication date	Aug 22, 2017
Grant date	Aug 22, 2017

Abstract

A vehicle speed change arrangement that can perform automatic speed change using a manual transmission, including shift blocks such that a shift block of a reverse-1st speed, a shift block of 4th speed-5th speed, a shift block of 2nd speed-3rd speed, and a shift block of 6th speed are arranged in this sequence in a select operation direction. The arrangement also includes first to fourth shift levers for shifting the shift blocks, select actuators for selecting the first to fourth shift levers, a first shift actuator for shifting the first or second shift lever, a second shift actuator for shifting the third or fourth shift lever, a gear disengagement determination unit for determining whether a gear is disengaged when the gear engagement or disengagement is made using the first and second shift actuators, and a drive unit for driving the gear engaging shift actuator when gear disengagement is determined.

First claim

What is claimed is:

1. A transmission device of a vehicle using a transmission, the transmission having a reverse gear position and a 1st speed gear position arranged opposite to one another, a 2nd speed gear position and a 3rd speed gear position arranged opposite to one another, a 4th speed gear position and a 5th speed gear position arranged opposite to one another, and a 6th speed gear position, with shift blocks configured to shift into the gear positions by a shift operation, the transmission being configured to perform a select operation and then perform the shift operation of the shift blocks for an automatic gear shifting, the transmission device comprising:
the shift blocks including a shift block of a reverse-1st speed, a shift block of a 4th speed-5th speed, a shift block of a 2nd speed-3rd speed, and a shift block of a 6th speed arranged in a direction of the select operation;
first to fourth shift levers configured to engage with the shift blocks,
a first shift cylindrical body which is rotatable into a position to engage the first shift lever or the second shift lever;
a second shift cylindrical body which is rotatable into a position to engage the third shift lever or the fourth shift lever;
a first select actuator configured to control the rotation position of the first shift cylindrical body and select the position at which the first shift cylindrical body engages the first shift lever and at the position at which the first cylindrical body engages the second shift lever;
a second select actuator configured to control the rotation position of the second shift cylindrical body and select one of two positions at which the second shift cylindrical body engages the third shift lever and at the other position at which the second shift cylindrical body engages the fourth shift lever;
a first shift actuator configured to move the first or second shift lever by the shift operation;
a second shift actuator configured to move the third or fourth shift lever by the shift operation;
a gear disengagement determination unit configured to determine whether a gear disengagement is made at a desired gear position when the gear disengagement and a gear engagement are performed on the desired gear position by the first and second shift actuators; and
a drive unit configured to drive one of the first and second shift actuators which is used for the gear disengagement, and drive the other of the first and second shift actuators which is used for the gear engagement when the gear disengagement determination unit determines that the gear disengagement is made.

2. The transmission device of the vehicle according to claim 1 , wherein the gear positions of the reverse and the 1st speed are arranged opposite to one another, the gear positions of the 2nd speed and the 3rd speed are arranged opposite to one another, the gear positions of the 4th speed and the 5th speed are arranged opposite to one another, first and second shift shafts parallel to one another are disposed at the gear position of the 6th speed, a first shift fork is fixedly secured on the first shift shaft, the shift block of the reverse-1st speed is fixedly secured on the first shift shaft, the first shift fork is configured to actuate a first sleeve that shifts the gear positions of the reverse and the 1st speed, a second shift fork is disposed on the first shift shaft such that the second shift fork is movable in an axial direction, the second shift fork is configured to actuate a second sleeve that shifts the gear positions of the 2nd speed and the 3rd speed, the shift block of the 2nd speed-3rd speed is coupled to the second shift fork, a fourth shift fork is coupled to the second shift shaft via a link lever, the shift block of the 6th speed is fixedly secured on the second shift shaft, the fourth shift fork is configured to actuate a fourth sleeve that shifts to the gear position of the 6th speed, a third shift fork is disposed on the second shift shaft such that the third shift fork is movable in the axial direction, the third shift fork is configured to actuate a third sleeve that shifts the gear positions of the 4th speed and the 5th speed, and the shift block of the 4th speed-5th speed is coupled to the third shift fork.

3. The transmission device according to claim 1 , wherein each of the first shift lever and the second shift lever is formed in an L shape, the first shift lever is spaced from the second shift lever in an up-down direction, the first and second shift levers are turnable horizontally, each of the first shift lever and the second shift lever has a lever portion in an L-folded part, the lever portion of the first shift lever engages with the shift block of the reverse-1st speed, the lever portion of the second shift lever engages with the shift block of the 4th speed-5th speed, and turning of the first shift lever and the second shift lever causes moving, by the shift operation, of the shift block of the reverse-1st speed and the shift block of the 4th speed-5th speed via the lever portions.

4. The transmission device of the vehicle according to claim 3 , wherein each of the third shift lever and the fourth shift lever is formed in an L shape, the third shift lever is spaced from the fourth shift lever in an up-down direction, the third and fourth shift levers are turnable horizontally, the third shift lever and the fourth shift lever are disposed opposite the first shift lever and the second shift lever, each of the third shift lever and the fourth shift lever has a lever portion in an L-folded part, the lever portion of the third shift lever engages with the shift block of the 2nd speed-3rd speed, the lever portion of the fourth shift lever engages with the shift block of the 6th speed, and turning of the third shift lever and the fourth shift lever causes moving, by the shift operation, of the shift block of the 2nd speed-3rd speed and the shift block of the 6th speed via the lever portions.

5. The transmission device of the vehicle according to claim 1 , wherein the gear disengagement determination unit has a sensor for detecting an amount of shift of each said shift block or each of the first and second shift actuators, the gear disengagement determination unit determines, based on the amount of shift detected by the sensor, whether the gear disengagement is made, and the drive unit receives a determination result of gear disengagement from the gear disengagement determination unit,
when the gear shifting is performed between the 2nd speed and the 3rd speed or between the 4th speed and the 5th speed, the drive unit drives the first or second shift actuator, without additional operation, to perform the gear disengagement and/or engagement, and
when the gear shifting is performed between the 1st speed and the 2nd speed, between the 3rd speed and the 4th speed, or between the 5th speed and the 6th speed, the drive unit drives the shift actuator that is used for the gear disengagement to a neutral position when the gear disengagement is determined, and also drives the other shift actuator, which is used for the gear engagement, to perform the gear engagement.

6. The transmission device of the vehicle according to claim 1 , wherein the first shift lever engages with the shift block of the reverse-1st speed, the second shift lever engages with the shift block of the 4th speed-5th speed, the third shift lever engages with the shift block of the 2nd speed-3rd speed, and the fourth shift lever engages with the shift block of the 6th speed.

Assignees

• Isuzu Motors Ltd

Inventors

• ENAMI Katsuhiro

Classifications

• F16H2063/3063

  using screw devices · CPC title

• F16H63/304

  the final output mechanisms comprising elements moved by electrical or magnetic force (band brake actuating mechanisms F16H63/3003) · CPC title

• F16H2063/3059

  using racks · CPC title

• F16H2063/208

  using two or more selecting fingers · CPC title

• F16H63/20

  with preselection and subsequent movement of each final output mechanism by movement of the final actuating mechanism in two different ways, e.g. guided by a shift gate · CPC title