JPH0570741B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a vehicular transmission having a main transmission gear train and a sub-transmission gear train, which is mainly applied to a vehicle in which an engine is installed horizontally.

(Prior Art) Conventionally, in this type of transmission, an input shaft and an output shaft are supported parallel to each other in a transmission case, and a shaft is provided between the two shafts parallel to the two shafts and mutually. A first intermediate shaft and a second intermediate shaft that are interlocked are pivotally supported, and a sub-transmission gear train is provided between the input shaft and the first intermediate shaft, and a sub-transmission gear train is provided between the input shaft and the first intermediate shaft.
It has been considered that a main transmission gear train is interposed between the intermediate shaft and the output shaft.

(Problem to be Solved by the Invention) By the way, it is generally desired that the output shaft of the engine and the axle of the driving wheels in a vehicle are located at the same level due to constraints of the minimum ground clearance of the vehicle and the height of the engine compartment. When using the conventional transmission described above and placing each axle of the transmission at approximately the same level, the axles and therefore the differential device that arranges the axles concentrically are placed on the transmission case so that the axles do not interfere with the transmission case. On the other hand, it has to be arranged offset in the longitudinal direction of the vehicle, which increases the dimension of the entire transmission including the differential in the longitudinal direction of the vehicle, resulting in a problem of poor space efficiency.

SUMMARY OF THE INVENTION In order to solve these problems, it is an object of the present invention to provide a vehicle transmission that can be reduced in length in the vehicle length direction.

(Means for Solving the Problems) In order to achieve the above object, the present invention supports an input shaft and an output shaft in parallel with each other in a transmission case, and also provides a space between the two shafts. A first intermediate shaft and a second intermediate shaft that are parallel to both shafts and interlock with each other are pivotally supported, and a sub-transmission gear train is provided between the input shaft and the first intermediate shaft, and a sub-transmission gear train is provided between the input shaft and the first intermediate shaft; In a transmission that includes a main transmission gear train interposed between the output shaft and the output shaft and transmits power from the output shaft to the drive wheels of the vehicle via a differential device, at least the output shaft and the second intermediate shaft is arranged above the plane connecting the input shaft and the center of the differential, and a drive gear connected to the output shaft on the same axis is meshed with the upper part of the ring gear of the differential. It is characterized by

(Function) By arranging the output shaft and the second intermediate shaft above the plane connecting the input shaft and the center of the differential, the main shaft including the output shaft and the second intermediate shaft of the transmission case The storage part of the transmission gear train can be formed in a shape offset above the surface, and the space below the storage part can be used as the space for arranging the axle, and the differential gear can be arranged in the longitudinal direction of the vehicle with respect to the storage part. Since they can be arranged in an overlapping manner, the overall dimension of the transmission in the vehicle length direction can be shortened.

Furthermore, since the housing portion is offset upward, the main transmission gear train is not immersed in the oil pool at the bottom of the transmission case, reducing power loss due to oil agitation resistance.

(Example) A case will be described in which the present invention is applied to an automatic FF vehicle.

Referring to FIGS. 1 to 3, 1 is a transmission; 2 is a transmission;
indicates a torque converter, and the transmission 1 is composed of a transmission main body 3 and a differential device 4, and is located on one side in the lateral direction with respect to a horizontal engine installed in the engine room at the front of the vehicle. For example, a transmission main body 3 is installed vertically on the right side with the torque converter 2 in between, and a differential device 4 is installed close to the rear of the engine. The power from the engine is transmitted via the torque converter 2, the transmission main body 3, and the differential device 4 to a pair of left and right front wheels, which are drive wheels, via each axle 5 connected to the differential device 4. .

The transmission body 3 is connected to the differential device 4 via an input shaft 6 that also serves as the output shaft of the torque converter 2 and a drive shaft 7 within a transmission case 9 that constitutes a casing of the transmission body 3. Output shaft 8
and a first intermediate shaft 10 and a second intermediate shaft 11 which are parallel to the two shafts 6 and 8 and are mutually interlocked are pivotally supported between the two shafts 6 and 8, A sub-transmission gear train 12 is provided between the input shaft 6 and the first intermediate shaft 10.
A main transmission gear train 13 is interposed between the second intermediate shaft 11 and the output shaft 8.

The auxiliary transmission gear train 12 includes a low speed gear train 14 established by a low speed hydraulic clutch 14a fixed to the first intermediate shaft 10, and a high speed gear train 15 established by a high speed hydraulic clutch 15a fixed to the input shaft 6. are arranged in parallel, and the speed is changed in two stages: low speed rotation and high speed rotation.

The main transmission gear train 13 includes a first gear train 16 established by a first speed hydraulic clutch 16a fixed to the second intermediate shaft 11, and a two-speed gear train 16 established by a second speed hydraulic clutch 17a fixed to the second intermediate shaft 11. Speed gear train 1
7, and a 3-speed hydraulic clutch 18 fixed to the output shaft 8.
The 3rd gear gear train 18 established by a is arranged in parallel to shift gears in 3 stages, and the reverse hydraulic clutch 19a fixed to the output shaft 8 and the idle gear 19
The reverse gear train 19 established by the reverse gear train 19b established by b is connected to each of the gear trains 16, 1
7 and 18 in parallel. Each transmission gear train 12, 13 is interlocked with an output gear 20 formed on the first intermediate shaft 10 and an input gear 18b formed on the second intermediate shaft 11 and constituting a third speed gear train 18. Each hydraulic clutch 14a, 15a, 16a, 17a, 1
8a and 19a are controlled according to the speed, and as a whole, six forward speeds and two reverse speeds are continuously changed.

In the figure, reference numeral 21 denotes a one-way system that restrains the gear on the output shaft 8 when the second intermediate shaft 11 rotates at a higher speed than the output shaft 8, and releases the restraint when the second intermediate shaft 11 rotates at a higher speed than the output shaft 8, thereby softening the shock during gear shifting. Showing ball bearings. Further, 23 is a drive gear fixed to the drive shaft 7 formed by extending the output shaft 8, and is meshed with the upper part of the ring gear 24 provided on the outer periphery of the differential device 4.

By the way, each of the shafts 6, 8, 10, 11 constituting the transmission main body 3 includes an output shaft 8 and a second intermediate shaft 1.
1 are positioned on the same horizontal plane diagonally upward and rearward relative to the input shaft 6, and the input shaft 6 and the second intermediate shaft 1
The first intermediate shaft 10 is located on the plane connecting the output shaft 8 and the second intermediate shaft 11.
The rear part 9a, which is the storage part of the storage part 3, is formed in an upwardly offset shape, and a lower space 22 is formed in the rear part 9a.

According to the above configuration, in order to arrange the axle 5 in the lower space 22, the differential device 4 is arranged close to the engine so as to overlap the rear lower part of the transmission case 9 when viewed from the side, and the output shaft By meshing the drive gear 23 on the drive shaft 7 extending from the drive shaft 8 with the ring gear 24 of the differential device 4 at its upper part, the overall dimension of the transmission 1 in the vehicle length direction can be shortened, and the space around the engine can be effectively used. Available.

In addition, the gears and clutches incorporated in the first intermediate shaft 10 and the second intermediate shaft 11 and the output shaft 8, which are arranged above the input shaft 6, are not immersed in oil in the oil pool at the bottom of the transmission case 9. It is not subject to stirring resistance.

(Effects of the Invention) As described above, according to the present invention, the length of the entire transmission in the vehicle longitudinal direction can be shortened, space efficiency is improved, and the first intermediate shaft on which many gears and clutches rotate integrally Since the second intermediate shaft and the output shaft are disposed above the input shaft, the second intermediate shaft and the output shaft are not immersed in oil in the oil reservoir of the transmission case, and power loss due to oil agitation resistance can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a cutaway side view of one embodiment of the present invention, and FIG.
The figure is a sectional view taken along the line -- in FIG. 1, and FIG. 3 is a conceptual diagram of the transmission. DESCRIPTION OF SYMBOLS 1... Transmission, 3... Transmission body, 4... Differential device, 5... Axle, 6... Input shaft, 8... Output shaft, 10... First intermediate shaft, 11... Second intermediate shaft,
12... Sub-transmission gear train, 13... Main transmission gear train,
23... Drive gear, 24... Ring gear.

Claims (1)

[Claims] 1 In the transmission case, an input shaft and an output shaft are supported in parallel with each other, and between the two shafts, a first intermediate shaft and a second intermediate shaft are provided which are parallel to the two shafts and interlock with each other. a sub-transmission gear train is interposed between the input shaft and the first intermediate shaft, a main transmission gear train is interposed between the second intermediate shaft and the output shaft, and the output shaft In a transmission that transmits power from a vehicle to drive wheels of a vehicle via a differential device, at least the output shaft and the second intermediate shaft,
A driving gear disposed above a plane connecting the input shaft and the center of the differential and connected to the output shaft on the same axis is meshed with the upper part of the ring gear of the differential. Vehicle transmission.