JPH01275955A - Power transmission for vehicle - Google Patents

Abstract

PURPOSE:To transmit torque with certainty as well as to make a variable speed gear compact in size, besides small capacity, by installing a wrapping continuously variable speed gear for speed control as interlocked with a geared element, and connecting an output shaft system to another geared element. CONSTITUTION:A differential gear mechanism 6 of a transmission gear 5 consists of a differential pinion 8 and each of paired differential side gears 9, 10 being engaged with this differential pinion 8. A wrapping continuously variable speed gear 12 is made up of wrapping a steel belt 15 on a driving pulley 13 and a driven pulley 14, and it is interlocked with a geared element 8 via a mechanical reduction gear 16, for speed control. An output shaft system 17 is connected to a remaining geared element 10 and interlocked with a symmetrical pair of wheels via the mechanical reduction gear and the differential gear mechanism or the like. Thus, engine torque is surely transmittable, and a variable speed gear is miniaturized and such one that is small in capacity is adoptable.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a power transmission device for a vehicle, and is used as a transmission for vehicles such as automobiles and industrial vehicles.

(Prior art) As continuously variable transmissions for automobiles, the technology of Japanese Patent Publication No. 55-6783 (prior art example 1), Japanese Patent Publication No. 57-19266, Japanese Patent Application Publication No. 5B-109759, Japanese Patent Publication No. 59-140958,
There are various technologies such as engine output (torque).
The speed is directly changed by the continuous variable transmission, and the transmission is transmitted to the differential gear of the drive wheels.

Furthermore, as an industrial continuously variable transmission, the Beyer continuously variable transmission has been commercially available for a long time.

(Problems to be Solved by the Invention) Since all continuously variable transmissions for automobiles directly change the speed based on the engine torque, they are advantageous in terms of speed control, but it is difficult to transmit large torque. For this reason, what has been put into practical use is the conventional technique No. 1, which is also
It is only applicable to automobiles with a displacement of 1000 to 1600 cc, and is difficult to apply to automobiles of 1800 cc or more due to insufficient transmission torque.

Furthermore, it is difficult for the Beyer continuously variable transmission to achieve the high speed of 4,000 to 6,000 rpm required by automobile specifications, and furthermore, it cannot be expected to achieve the weight reduction required for automobiles.

The present invention enables speed control to be continuously variable while engine torque is reliably transmitted through gear transmission.More specifically, the present invention is a gear transmission device (differential gears, planetary gears),
The purpose of the continuously variable transmission is to solve the problems described above by using it for speed control rather than transmitting engine torque.

(Means for Achieving the Object) The present invention takes the following technical means to achieve the stated purpose.

That is, the present invention includes a gear transmission including three gear transmission elements, a transmission shaft system for transmitting torque from an engine to any one of the gear transmission elements, and a transmission shaft system that transmits torque from an engine to one of the gear transmission elements. It is characterized in that it is equipped with a winding continuously variable transmission that performs speed control in conjunction with one gear transmission element, and an output shaft system connected to the remaining gear transmission element.

(Embodiments and Operations) Hereinafter, embodiments of the present invention and some of their operations will be described in detail with reference to the drawings.

In FIG. 1, reference numeral 1 denotes an engine, and its output system 2 includes a main clutch 3 and a forward/reverse switching device 4.

Reference numeral 5 denotes a gear transmission, which in this embodiment is a differential gear 6, which includes a differential case 7, a differential pinion 8 supported by the differential case 7, and a pair of differential side gears 9 meshing with the differential pinion 8.
．． 10, including three gear transmission elements 8, 9.
10, the torque from the engine 1 is transmitted through the transmission shaft system 11
is transmitted to gear 9 via.

Reference numeral 12 denotes a continuous variable transmission, in which an endless steel belt 15 is wound around a drive pulley 13 and a driven boob IJ-14 provided on the transmission shaft system 11.
The gear transmission element 8 is interlocked with the gear transmission element 8 to control the speed.

An output shaft system 17 is connected to the remaining gear transmission element 10,
It is linked to a pair of left and right wheels 20 via a gear reduction gear 18, a differential gear 19, and the like.

The embodiment shown in FIG. 2 includes a transmission shaft system 11 and a continuously variable transmission device 1
2 are interlocked and connected by a gear reduction gear 21, and the other configurations are the same as in FIG. 1, and common parts are indicated by common symbols.

FIG. 3 shows an example in which an idler M gear (reduction) device 22 is used as a gear transmission device 5 having three gear transmission elements.
23 is a sun gear, 24 is a planetary gear, and 25 is a ring gear. These gears 23, 24 and 25 are three gear transmission elements. In this embodiment, the transmission shaft system 11 is attached to the sun gear 23, The continuously variable transmission 12 is the ring gear 2
5, the output shaft system 17 is connected to a planetary gear 24, respectively.

FIG. 4 shows only the main parts, and the differential case 7 is supported by a differential housing (carrier) 26 so as to be able to revolve freely, and this differential case 7 has two differential pinions 8. is interlocked with the differential side gear 9, and the transmission shaft system 2 is transmitted to the gear 27 of the differential case 7 via a gear 28 to reduce the speed, thereby enabling speed control.

FIG. 5 shows a more specific diagram of the transmission shaft system 11.
consists of a spline shaft 11A, which is supported by a housing 29, and this spline shaft 118 is equipped with a drive pulley 13, which is connected to a fixed pulley 13.
A and a sliding pulley 13B, and the sliding pulley 13B transmits fluid pressure (hydraulic pressure) to the action chamber 32 via the low rigidity joint 30, the passage 31, etc., and the belt 15
The diameter of the winding is variable.

The driven pulley 14 is composed of a fixed pulley 14A and a sliding pulley 14B provided on the spline shaft 33, and transmits fluid pressure (hydraulic pressure) to the action chamber 36 via the rotary joint 34, passage 35, etc. The diameter of the winding 15 is variable.

Here, the speed of the gear transmission device 5 can be controlled by the continuously variable transmission device 12 via the gear reduction device 16 on the gear 27 of the differential case 7.

It goes without saying that the winding continuously variable transmission 12 may have a structure other than that shown in FIG. 5.

Furthermore, in each figure, the wrap-around continuously variable transmission 12 is provided on the input side of the gear transmission 5, but it may be provided on the output side of the gear transmission 5. Furthermore, the differential gear device 6 may be of a spur gear type, a helical gear, or a helical gear.

Next, the operation will be explained with reference to FIG. 1 (with reference to FIGS. 2 to 5 as well).

The torque of the engine 1 is transmitted to the gear transmission element 9 by the transmission shaft system 2, while the speed of the gear transmission 5 is controlled by the continuous variable transmission device 12.

Then, the torque of engine l is the gear transmission element 9.10
etc., to the wheels 20, and the speed ratio thereof is controlled by the continuously variable transmission 12.

Here, the torque is transmitted reliably and with high reliability using gears, and the continuously variable transmission device 1
2 has little torque transmission (it can be made to contribute exclusively to speed control, which means that the transmission 12 can be small and have a small capacity, and as a result, in addition to the pulley type shown in the figure, it can also be used as a traction type It is also possible to use it in the form of a rubber belt.

(Effects of the Invention) The present invention includes a gear transmission having three gear transmission elements, and includes a transmission shaft system for transmitting torque from an engine to any one of the gear transmission elements of the gear transmission,
The present invention is characterized in that it is equipped with a continuously variable transmission device that performs speed control in conjunction with one other gear transmission element, and includes an output shaft system connected to the remaining gear transmission element, Even if the engine torque is large, it can be transmitted reliably using gear transmission elements with high reliability.
Since almost no torque is applied to the continuously variable transmission, the transmission can be made small and have a small capacity.

Furthermore, since the speed is controlled by a continuously variable transmission device, the high speed required by automobiles can be satisfied.

The present invention has the above advantages and is of great practical benefit as a power transmission device for automobiles, industrial vehicles, etc.

[Brief explanation of the drawing]

The drawings show embodiments of the present invention. FIGS. 1 to 3 are overall configuration diagrams showing three examples, FIG. 4 is a sectional view of the main part, and FIG. 5 is a detailed sectional view of the main part. DESCRIPTION OF SYMBOLS 1... Engine, 2... Transmission shaft system, 5... Gear transmission, 6... Differential gear device, 8,9.10... Three gear transmission elements, 12... Winding continuously variable transmission. 1 oppression

Claims (3)

[Claims] (1) A gear transmission having three gear transmission elements is provided, and in any one of the gear transmission elements,
It is equipped with a transmission shaft system that transmits torque from the engine, a continuously variable transmission device that controls speed by being linked to one other gear transmission element, and an output shaft system that is connected to the remaining gear transmission element. A vehicle power transmission device comprising: (2) The vehicle power transmission system according to claim (1), wherein the gear transmission is a differential gear system. (3) The vehicle power transmission system according to claim (1), wherein the gear transmission is a planetary gear system.