JPS63149226A - Four-wheel drive gear with center-differential - Google Patents

Abstract

PURPOSE:To simplify power transmission arrangement by arranging a planetary center-differential within a transmission, by transmitting power to front and rear wheels from the carrier shaft and the sun gear shaft through the differential and the transfer gear and the like, respectively. CONSTITUTION:At the front portion of the body of a vehicle an engine 1, clutch 2 and transmission 3 are arranged laterally in both right and left directions, while at the positions from the transmission 3 to the rear side of the body a front differential 4 and a transfer unit are sequentially arranged. In the above constitution, within the transmission 3 a planetary center differential 30 is arranged coaxially with an output shaft 11. Further the planetary center- differential 30 is arranged such that a sun gear 31 is meshed with a ring gear 33 through a pinion 32 while the pinion 32 is supported by a carrier 34 and at the same time the carrier 34 is coupled to an output axis 11 directly, thereby the output from the transmission is taken out by being distributed equally to the sun gear 31 and the ring gear 33.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a full-time four-wheel drive device equipped with a center differential device, and more particularly, to an arrangement structure of the center differential device.

[Conventional technology]

A full-time four-wheel drive system is generally equipped with a center differential device and is configured to transmit the output from the transmission by equally distributing torque to the front and rear wheels using the center differential device. Therefore, the center differential device is interposed on the output side of the transmission, and various methods have been proposed regarding its arrangement and power routing. Here, in order to reduce the size and vehicle height, there is a method in which the center differential device is built into the transmission case. Conventionally, as this type of four-wheel drive device with a center differential, there is a prior art technology of a built-in transmission type center differential device, for example, as disclosed in Japanese Patent Application Laid-Open No. 59-81224. Here, in the transverse transaxle type, a planetary center differential device is disposed coaxially with the output shaft in a side case of the transmission on the opposite side from the engine. It is shown that power is transmitted from the sun gear of the center differential device to the front wheels via a shaft inside the output shaft, and to the rear wheels via a carrier, a duction gear, an offset shaft, etc.

[Problems to be solved by the invention]

By the way, in the prior art mentioned above, since the center differential device is located in the transmission on the side away from the center of the vehicle body, a long shaft or the like is required to route the two systems of power from the center differential device. The structure becomes complicated. Further, since the center differential device is attached to the side of the transmission, there is a problem that it is not easy to increase the number of reoverdrive gears depending on the speed of the vehicle. The present invention was made in view of the above circumstances, and provides a four-wheel drive vehicle with a center differential that simplifies power routing by taking into consideration the arrangement of the center differential built into the transmission. The purpose is to provide a vJ device.

[Means to solve the problem]

In order to achieve the above object, the present invention provides a horizontal transaxle type in which an engine, a clutch, and a transmission are placed horizontally in the left-right direction of a vehicle body, and a planetary shaft is installed at a location on the engine side coaxial with an output shaft in the transmission. The center differential device has a ring gear directly connected to the transmission output shaft, rotatably supports the shaft of sun gear A7, and the carrier shaft is arranged outside the sun gear shaft. from the shaft to one of the front and rear wheels via the differential device,
It is configured to transmit power from the shaft of the sun gear to the other of the front and rear wheels via a transfer gear or the like. [Function 1] Based on the above configuration, a planetary gear type center differential device is arranged near the center of the vehicle body in the transmission, and power is immediately transmitted from the shaft of the carrier to, for example, the front wheels via the differential device, and from the shaft of the sun gear to the transfer gear 17. For example, power is transmitted to the rear wheels via the rear wheels. In this way, the present invention eliminates the need to route power from the center differential device using a long shaft or the like, and it is also possible to make lubrication advantageous. [Embodiment 1] Hereinafter, one embodiment of the present invention will be specifically described with reference to the drawings. In the drawings, a four-wheel drive device to which the present invention is applied,
To explain the transmission system based on a transverse transaxle type FF vehicle, the engine 1 is located at the front of the vehicle. A clutch 2 and a transmission 3 are arranged horizontally in the left-right direction, and a front differential device 4. Transfer devices 5 are sequentially arranged. And transmission 3. The front differential device 4 and the transfer device 5 are installed inside a clutch housing 6, a transmission case 7, and an extension case 8 to form a transaxle type. The transmission 3 is of a constant mesh type, and has an input shaft 10 from the clutch 2 and an output shaft 11 arranged parallel to the input shaft 10. Shift gears 12 to 16 are provided, a synchronizing mechanism 17 between gears 12 and 13, and gears 14 and 15.
By selectively operating the synchronizing mechanism 18 between the two gears or the synchronizing mechanism 19 adjacent to the gear 16, each of the forward gears from the first to the fifth gears is obtained. Further, the reverse gear is obtained by meshing a reverse gear 20 integral with the input shaft 10 with a gear 21 on the sleeve side of the synchro n structure 17 via an idler gear (not shown). Therefore, a planetary center differential device 30 is disposed inside the transmission 3 at a location on the engine 1 side coaxially with the output shaft 11. In the center differential device 30, a ring gear 33 meshes with a sun gear 31 via a pinion 32, and a pinion 32 is supported by a carrier 34. This ring gear 33 is directly connected to the output shaft 11 and transmits the transmission output to the sun gear. 31 and the carrier 34 to be taken out. A shaft 35 of the sun gear 31 is supported by bearings 36 and 37 at both ends and is disposed coaxially with the output shaft 11, and a shaft 38 of the carrier 34 is provided outside this shaft 35. Further, the shaft 38 of the carrier 34 is provided with a shaft.
A drive gear 41 in a final gear 40 is integrally formed and meshes with a driven gear 44 that is integral with a differential case 43 of a differential device 42, and transmission is configured from the differential device 42 to left and right front wheels (not shown) via an axle 45. . on the other hand,
A drive gear 51 in a transfer gear 50 of the transfer device 5 is integrally formed at @35 of the sun gear 31, and this drive gear 51 is rotatably attached to the differential case 43 and is connected to the transfer shaft via an idler gear 52 arranged parallel to the driven gear 44. 53 driven gear 5
It meshes with 4. The transfer shaft 53 changes its direction in the longitudinal direction of the vehicle by a pair of bevel gears 55 and is connected to a rear drive shaft 5G, and is configured to transmit power to the rear wheels from the rear drive shaft 56 via a propeller shaft (not shown) or the like. Next, the operation of the four-wheel drive device configured in this manner will be described. First, power from the engine 1 is input to the input shaft 10 of the speed change lR3 via the clutch 2, and the power is output to the output shaft 11 after being changed in speed by the speed change gear and the synchronization mechanism. This shifting power is input to the ring gear 33 of the center differential device 30 located near the center, and the torque is distributed to the sun gear 31 and the carrier 34, and the power distributed to the carrier 34 is immediately transferred to the final drive gear 41 of the front differential device 4. It is transmitted to the final drive gear 44 for final deceleration, and transmitted to the front wheels by the arrival start device 42 and the width shaft 45 to drive them. On the other hand, the power distributed to the sun gear 31 is transmitted to the transfer shaft 53 via gears 51, 52, and 54 of the transfer, and further transmitted to the rear wheels by the bevel gear 55 etc. to drive them. Full-time four-wheel drive. Note that the present invention can be similarly applied even when the engine, clutch, and transmission are mounted at the rear of the vehicle body. [Effects of the Invention] As described above, according to the present invention, in a system in which a center differential device is built into a transmission, the center differential device is disposed near the center of the vehicle body and power is mainly routed by gears.
The structure is greatly simplified and the addition of gears to the transmission is not impaired. The center differential device is located near the final gear,
Since the transfer gear train is also arranged parallel to the final gear, lubrication by oil droplets can be effectively performed.

[Brief explanation of the drawing]

The drawing is a skeleton diagram showing an embodiment of the four-wheel drive device of the present invention. 1... Engine, 2... Clutch, 3... Transmission, 4... Front differential 115f, 11... Output shaft,
30... Center differential device, 31... Sun gear, 3
3...Ring gear, 34...Carrier, 35...
Sun gear axis, 38...Carrier axis, 40...Final gear V150...Transfer gear, 56...
・Rear drive shaft.

Claims (1)

[Scope of Claims] In a horizontal transaxle type vehicle in which the engine, clutch, and transmission are arranged horizontally in the left-right direction of the vehicle body, a planetary center differential device is arranged on the engine side on the same axis as the output shaft in the transmission. The center differential device has a ring gear directly connected to the output shaft, rotatably supports the sun gear shaft, and a carrier shaft disposed outside the sun gear shaft. A four-wheel drive device with a center differential characterized in that power is transmitted to one of the front and rear wheels from the shaft of a sun gear to the other of the front and rear wheels via a transfer gear or the like.