JPH07323760A - Power transmitting device - Google Patents

Abstract

PURPOSE:To prevent the damage of a supercharger due to the reverse operation by arranging a one-way clutch to the power transmission system to distribute the driving force of the engine from a differential mechanism to the supercharger side, and stopping the supercharger when the engine brake is applied. CONSTITUTION:A power transmission device 1 such as a differential drive engine consists of a planetary gear type differential mechanism 3 connected to the engine 13, a transmission 5, a screw type supercharger 7, the power transmission system 9, etc. In this device, a pinion 35 of a speed increasing gear train 27 to constitute the power transmission system 9 is fixed. A one-way clutch 31 is provided on the shaft end of an input shaft 29 of the supercharger 7. This one-way clutch 31 is provided so as to allow the rotation of the supercharger 7 only when a vehicle travels forward. This constitution blocks the rotation in the direction where the direction of the torque applied to a sun gear 23 of the differential mechanism 3 is reversed which is generated when the engine brake is applied to the vehicle, and protects the supercharger 7 from the damage due to the reverse rotation.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art A power transmission device 201 as shown in FIG. 3 is described in Motor Fan, January 1992, page 166. This is called a differential drive engine, and the driving force of the engine 203 is sent to the transmission 207 and the supercharger 209 via the differential mechanism 205. The drive torque of the engine 203 is distributed to the transmission 207 and the supercharger 209 at a ratio of, for example, 10: 1 depending on the gear ratio of the differential mechanism 205. As the driving resistance of the wheels 211 increases, the differential mechanism 205
Since the driving force distributed to the supercharger 209 via the power transmission device 201 becomes large, the power transmission device 201 increases the rotational speed of the supercharger 209 as much as when the vehicle is zero starting or climbing a slope. It has the advantage that pressure can be obtained.

[0003]

However, in the above power transmission device 201, when the vehicle operates the engine brake, the direction of torque changes from the wheel 211 to the direction of the engine 203, and the supercharger 209 reverses. In general, the supercharger is not designed to rotate in the opposite direction, so if it is reversed, the seal portion is easily damaged, and the braking torque of the engine 203 escapes due to the rotation of the supercharger 209, which suppresses the engine brake. Power is reduced. If the reverse gear of the transmission 207 is used, reverse rotation of the supercharger 209 can be prevented, but escape of braking torque cannot be prevented.

Therefore, the present invention is constructed so that the driving force of the engine is distributed to the wheel side and the supercharger through a differential mechanism, and the reverse rotation and the brake of the supercharger when the engine brake is operated. An object of the present invention is to provide a power transmission device that prevents a decrease in force.

[0005]

SUMMARY OF THE INVENTION A power transmission device of the present invention comprises a differential mechanism for transmitting the driving force of an engine from one output side differential member to a wheel side, and the other output side difference of this differential mechanism. A supercharger that supplies pressurized air to the engine driven from a moving member via a power transmission system having a one-way clutch, the one-way clutch actuating an engine brake while the vehicle is traveling forward. It is characterized in that it is arranged in a direction that prevents the supercharger from rotating in the reverse direction.

[0006]

In the power transmission device of the present invention, the one-way clutch is arranged in the power transmission system between the differential mechanism and the supercharger to stop the rotation of the supercharger during engine braking. Therefore, the seal is prevented from being damaged due to the reverse rotation of the supercharger, and the braking torque is prevented from escaping from the supercharger, so that the engine brake works effectively.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIG. Hereinafter, members and the like not given reference numerals are not shown.

As shown in FIG. 1, a power transmission device 1 of this embodiment includes a planetary gear type differential mechanism 3, a transmission 5, a screw type supercharger 7 having convex and concave screw rotors, and a power source. It is composed of a transmission system 9 and the like.

An internal gear 11 of the differential mechanism 3 is connected to a crankshaft 15 of an engine 13, and a pinion shaft 19 supporting a pinion gear 17 is supported by a pinion carrier 21 (one output side differential member). There is. The pinion carrier 21 is connected to the transmission 5 and further to the wheel side via a connecting shaft 25 that penetrates the hollow sun gear 23 (the other output-side differential member).

The power transmission system 9 comprises a speed increasing gear set 27, an input shaft 29 of the supercharger 7, a one-way clutch 31 and the like. The large gear 33 of the speed increasing gear set 27 is the sun gear 2.
3, and the pinion gear 35 is fixed to the input shaft 29.

The one-way clutch 31 supports one end of the input shaft 29 between a support portion 37 (fixed system) on the vehicle body side, and allows the supercharger 7 to rotate when the vehicle travels forward. It is arranged.

The differential mechanism 3 receives the drive torque of the engine 13 input from the internal gear 11 from the pinion carrier 2.
It is output to the transmission 5 and the supercharger 7 side at a ratio of 10: 1 via 1 and the sun gear 23.

The driving force of the engine 13 sent to the transmission 5 rotationally drives the driving wheels via the propeller shaft and the differential device on the axle, and the supercharger 7
Supplies the intake air to the engine 13 by pressurizing intake air between a pair of convex and concave screw rotors that rotate relative to each other by the driving force increased through the speed increasing gear set 27.

When the vehicle brakes the engine, the direction of torque is from the drive wheels to the engine 1 even if the rotation direction is the same.
Since the direction changes to 3, the torque direction applied to the sun gear 23 of the differential mechanism 3 reverses, but the rotation in this direction is interrupted by the one-way clutch 31, and the rotation of the supercharger 7 is stopped.

As described above, since the rotation of the supercharger 7 is stopped by the one-way clutch 31 during engine braking, unlike the conventional example, the supercharger 7 is prevented from being damaged by the reverse rotation and the seal portion. The escape of the braking torque from the supercharger 7 is prevented, and the engine brake works effectively.

The location of the one-way clutch 31 is not limited to that between the fixed system and the one-way clutch 31 and may be located anywhere in the power transmission system 9 that connects the sun gear 23 and the supercharger 7. FIG. 2 shows an example in which a one-way clutch 31 is arranged between the housing 39 of the supercharger 7 and the input shaft 29.

As the supercharger 7, any air compressor used in a mechanical supercharger such as a roots type or a vane type can be used. Alternatively, a centrifugal air compressor can be used by incorporating a speed increasing mechanism in the power transmission system.

Depending on the vehicle type, the driving force of the engine distributed from the differential mechanism may be transmitted to the wheel side without passing through the transmission.

[0019]

In the power transmission device of the present invention, the one-way clutch is arranged in the power transmission system that distributes the driving force of the engine from the differential mechanism to the supercharger side so that the supercharger rotates during engine braking. Is stopped, damage to the supercharger due to reverse rotation is prevented, and escape of the braking torque due to rotation of the supercharger is prevented, so that the braking force of the engine brake is improved.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of the present invention.

FIG. 2 is a schematic diagram showing an example of a location of a one-way clutch.

FIG. 3 is a configuration diagram of a conventional example.

[Explanation of symbols]

 1 Power Transmission Device 3 Planetary Gear Type Differential Mechanism (Differential Mechanism) 5 Transmission 7 Screw Type Supercharger (Supercharger) 9 Power Transmission System 13 Engine 21 Pinion Carrier (One Output Differential Member) 23 Sun Gear (Other output-side differential member) 31 One-way clutch 37 Support (fixed system)

Claims (1)

[Claims] 1. A differential mechanism for transmitting a driving force of an engine from one output side differential member to a wheel side, and another output side differential member of the differential mechanism via a power transmission system having a one-way clutch. And a supercharger that supplies pressurized intake air to the engine, and the one-way clutch is arranged in a direction that prevents reverse rotation of the supercharger when the engine brake is operated while the vehicle is traveling forward. A power transmission device characterized in that