JPH04307149A - Geared transmission for vehicle - Google Patents

Abstract

PURPOSE:To form a geared transmission into a multistage shift as well as to shorten the extent of length in the axial direction of a transmission in the base where a backward speed is constituted into a normally engaged type gear train. CONSTITUTION:A function of first gear speed and backward shift gear trains is imparted to a first shift gear train (second drive gear 14b, second counter gear 16b) among plural shift gear trains constituting each of shift speeds, while another function of first, second and 5-shift gear trains are imparted to a second shift gear train (fifth drive gear 14c, fourth driven gear 15d), through which common use of plural shift gear trains is promoted, thus the extent of length in the axial direction of a transmission is shortened.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gear transmission for a vehicle.

0002

[Prior Art] A gear type transmission for a vehicle includes an input shaft and an output shaft that are rotatably supported in a case in parallel with each other, and a gear train of a plurality of speeds is arranged between these shafts. Used as a transmission for front-wheel drive or four-wheel drive vehicles with transverse engines,
It has extremely advantageous aspects such as being able to expand the space inside the vehicle. Furthermore, with the diversification of vehicles, such as higher performance, lower fuel consumption, etc., there may be a demand for multi-speed gears.

[0003] As a transmission of this type that is multi-staged by providing an extra low gear train, etc., there is known a transmission disclosed in Japanese Patent Application Laid-Open No. 61-286642 filed by the present applicant. The transmission includes an input shaft, an output shaft, and a countershaft that are rotatably supported by a case and are parallel to each other, and between the input shaft and the output shaft, and between the input shaft, the output shaft, and the countershaft. a plurality of transmission gear trains are provided between each of the three shafts, and a transmission path for transmitting the driving force transmitted to the input shaft to the output shaft is a transmission path via the transmission gear trains between the input shaft and the output shaft. , and a transmission path via a transmission gear train between the input shaft, the counter shaft, and the output shaft. In addition, the transmission is a gear sliding type reverse gear consisting of a reverse idler gear that is slidably assembled on a reverse idler shaft, a reverse drive gear that is installed on the input shaft, and a reverse driven gear that is installed on the output shaft. It has a gear train.

0004

[Problems to be Solved by the Invention] In this transmission, the reverse gear is located on the input shaft and the output shaft, and the reverse gear is also located on the reverse idler shaft. There is a problem that the length is correspondingly longer and the cross-sectional shape in the direction perpendicular to the axis becomes larger. On the other hand, in order to respond to the improvement in the quality required by the market for current vehicles,
In order to eliminate reverse gear noise in reverse gear, locking during reverse gear shift, reverse gear noise, etc., a constantly meshing reverse gear train is sometimes required. To meet this requirement, it is necessary to install a reverse drive gear on the input shaft and a reverse driven gear on the output shaft, and also install a synchronizer on one of these shafts to connect and disconnect the gear and the shaft. must be established. For this reason, even if the reverse gear train of the transmission described above is changed to a constant mesh type, the problem that the axial length of the transmission becomes longer cannot be solved. Therefore, it is an object of the present invention to eliminate such problems.

[0005]

[Means for Solving the Problems] The present invention provides input shafts rotatably supported by a case and parallel to each other;
An output shaft and a counter shaft are provided, and a plurality of transmission gear trains are provided between the input shaft and the output shaft, and between the input shaft, the output shaft, and the counter shaft, and the input shaft is provided with a plurality of transmission gear trains. A transmission path for transmitting the transmitted driving force to the output shaft is a transmission path via a transmission gear train between the input shaft and the output shaft, and a transmission gear train between the input shaft, the counter shaft, and the output shaft. In a gear type transmission for a vehicle that operates on a two-system transmission path, the transmission includes at least one speed change gear train disposed between the input shaft and the countershaft, and between the input shaft and the output shaft. The present invention is characterized in that at least one speed change gear train is constructed as a speed change gear train that transmits driving force for a plurality of speed stages.

[0006]

[Operations and effects of the invention] In the transmission having such a configuration,
The transmission of driving force from the input shaft to the countershaft can be used for multiple gears with a single-speed gear train, and the transmission of the driving force from the countershaft to the output shaft can be done via the input shaft to shift other gears. A gear train can be used. For this reason,
A plurality of transmission gear trains can be shared with each other, and the number of locations for disposing the gears constituting the transmission gear trains that must be secured on each shaft can be reduced, and the axial length of the transmission can be shortened. Can be done. In addition, in the transmission, gears and/or synchronizers constituting a reverse gear train can be assembled on the countershaft, and the countershaft can be replaced by a reverse idler shaft that a conventional parallel two-shaft transmission has. It can be installed at the installation site. Therefore, an increase in the cross-sectional shape in the direction perpendicular to the axis of the transmission is prevented.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a transmission according to the present invention cut between the axes of each shaft and unfolded. The transmission 10 includes a front differential 2 as shown in FIG.
0 is integrally assembled to form a transaxle. The transaxle is for a transverse engine type front wheel drive vehicle, and the transmission 1 in the transaxle is
0 is configured with 6 forward gears and reverse gears,
It includes an input shaft 11, an output shaft 12, and a counter shaft 13, as well as transmission gear trains 14 to 16 and synchronizers 17 for each gear stage. These shafts 11, 12, and 13 are rotatably supported in parallel with each other on an axle case 18, and the input shaft 11 is connected to a crankshaft 31 of an engine (not shown) via a clutch 32 so as to transmit power. The output shaft 12 is connected to the front differential 20 through an output gear 12a formed on the output shaft 12 so as to transmit power.

The front differential 20 is a conventionally known differential and includes a differential case 21, a plurality of pinion gears 22, a pair of side gears 23, and a side gear shaft 24. In the differential 20, a ring gear 25 assembled to a differential case 21 meshes with the output gear 12a on the output shaft 12 of the transmission 10, and each side gear shaft 24 is connected to each drive shaft (not shown) on the left and right. Connected to enable power transmission. Thereby, the driving force transmitted from the output shaft 12 via the ring gear 25 is distributed to each side gear 23 of the differential 20 and output to each front wheel side.

[0009]The input shaft 11 constituting the transmission 10 has the first to sixth drive gears 14a to 14.
f and a first synchronizer 17a, the output shaft 12 includes first to fifth driven gears 15a to 15e and a second synchronizer 17b, and the counter shaft 1
3 is the first to fourth counter gears 16a to 16d and the third
, fourth synchronizers 17c and 17d.

On the input shaft 11, a first drive gear 14a of each drive gear is assembled so as to be able to rotate integrally with the second drive gear 14b and a third drive gear 14a.
The drive gear 14c is formed in a body, the fourth drive gear 14d is rotatably assembled to the body, and the fifth drive gear 14e and the sixth drive gear 14f are rotatably assembled, and the first synchronous The device 17a is arranged between the fifth drive gear 14e and the sixth drive gear 14f. Further, on the output shaft 12, a first driven gear 15a of each driven gear is rotatably assembled, a second driven gear 15b and a third driven gear 15c are rotatably assembled, and a fourth driven gear 15d and a third driven gear 15c are rotatably assembled. 5th driven gear 15
e is rotatably assembled, and the second synchronizer 1
7b is arranged between the second driven gear 15b and the third driven gear 15c.

Further, on the counter shaft 13, the first counter gear 16a is rotatably assembled, the second counter gear 16b is integrally formed, and the third counter gear 16c is rotatably assembled on the counter shaft 13. The fourth counter gear 16d is rotatably assembled on the hollow rotary body 13a, and the third synchronizer 17c is formed on the hollow rotary body 13a that can be fitted on the hollow rotary body 13a. The fourth synchronizer 17d is disposed on the side of the first counter gear 16a at the end thereof, and the fourth synchronizer 17d is disposed on the side of the first counter gear 16a.
It is disposed at the top between the second counter gear 16b and the fourth counter gear 16d.

In each of these transmission gears, the first drive gear 14a and the second driven gear 15b mesh with each other.
The second drive gear 14b and the second counter gear 16b mesh with each other, and the third drive gear 14c and the fourth counter gear 1
6d mesh with each other, the fourth drive gear 14d and third driven gear 15c mesh with each other, the fifth drive gear 14e, fourth driven gear 15d and third counter gear 16c mesh with each other, and the sixth drive gear 14f and third driven gear 15c mesh with each other. 5 driven gear 15e is meshing with it. In addition, the first driven gear 15
a meshes with the second counter gear 16a.

In the transmission 10, the following gear stage driving force transmission paths are configured by the above-mentioned meshing states of the respective transmission gears. That is, 1st speed: input shaft 11-(2nd drive gear 1
4b-second counter gear 16b)-fourth synchronizer 17d
-Third counter gear 16c-[Fifth drive gear 14e
- 4th driven gear 15d] - Output shaft 1
2 2nd speed: input shaft 11 - third drive gear 14
c - Fourth counter gear 16d - Fourth synchronizer 17d - Third counter gear 16c - [Fifth drive gear 14e - Fourth driven gear 15d] - Output shaft 123
Speed: input shaft 11-first drive gear 14a
- Second driven gear 1 5b - Second synchronizer 17b - Output shaft 12
4th speed: input shaft 11-4th drive gear 14
d-Third driven gear 15c-Second synchronizer 17b-Output shaft 12 5th speed: Input shaft 11-First synchronizer 17a-
[Fifth drive gear 14e-fourth driven gear 15d]
- Output shaft 12 6th speed: Input shaft 11 - First synchronizer 17a -
Sixth drive gear 14f - Fifth driven gear 15e - Output shaft 12 Reverse speed: Input shaft 11 - (Second drive gear 14b - Second counter gear 16b) - Third synchronizer 17
c-first counter gear 16a-first driven gear 15a
-Output shaft 12

In the driving force transmission path of the above-mentioned gears, as shown in parentheses () and [], the transmission is from the second drive gear 14b on the input shaft 11 and the second counter gear 16b on the countershaft 13. The transmission gear train consisting of the fifth drive gear 14e on the input shaft 11 and the fourth driven gear 15d on the output shaft 12 functions as the first speed gear train and the reverse speed gear train. It has the functions of a 2-speed gear train, a 2-speed gear train, and a 5-speed gear train.

[0015] In this embodiment, each transmission gear train has a plurality of functions.
physically forming a second drive gear 14b thereon, and rotatably assembling a fourth drive gear 14d;
A second counter gear 16b is physically formed on the counter shaft 13 and meshes with the second drive gear 14b, and a third counter gear 16b is formed on the hollow rotating body 13a and meshes with the fourth drive gear 14d. forming the counter gear 16c integrally, rotatably assembling a fourth counter gear 16d meshing with the third drive gear 14c on the hollow rotary body 13a, and disposing a fourth synchronizer 17d; The first counter gear 16 is mounted on the counter shaft 13.
This can be achieved by rotatably assembling a and arranging the third synchronizer 17c.

Therefore, in the transmission 10, the above-mentioned two types of transmission gear trains (14b, 16b) and [14e
, 15d] can be shared with each other so that each shaft 1
It is possible to reduce the number of locations where the gears constituting the transmission gear train that should be secured on the transmission gears 1 to 13 can be reduced, the axial length of the transmission 10 can be shortened, and the weight can be reduced. . In addition, in the transmission 10, the first counter gear 16a and the third synchronizer 17c, which constitute a reverse speed gear train, can be assembled on the counter shaft 13, and the counter shaft 13 can be mounted on the counter shaft 13 as opposed to the conventional parallel two-axis It can be arranged at the arrangement site of the reverse idler shaft of the type transmission. Therefore, an increase in the cross-sectional shape in the direction orthogonal to the axis of the transmission 10 is prevented.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a transmission according to an embodiment of the present invention.

FIG. 2 is a skeleton diagram of a front-wheel drive vehicle transaxle in which the transmission is incorporated.

[Explanation of symbols]

10...Transmission, 11...Input shaft, 12...Output shaft, 13...Counter shaft, 13a...
Hollow rotating body, 14a-14f...drive gear, 15a-
15e...Driven gear, 16a-16d...Counter gear, 17a-17d...Synchronizer, 20...Differential.

Claims (1)

[Claims] 1. An input shaft, an output shaft, and a counter shaft rotatably supported by a case and arranged in parallel to each other, and between the two shafts, the input shaft and the output shaft, and between the input shaft, the output shaft, and the counter shaft. A plurality of transmission gear trains are provided between each of the three shafts, and a transmission path for transmitting the driving force transmitted to the input shaft to the output shaft is transmitted via the transmission gear trains between the input shaft and the output shaft. and a transmission path via a transmission gear train between the input shaft, the countershaft, and the output shaft, in the gear type transmission for a vehicle, which is disposed between the input shaft and the countershaft. and at least one speed gear train disposed between the input shaft and the output shaft are configured as a speed change gear train that transmits driving force for a plurality of gears. Gear transmission.