JPS6131546Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a power transmission device suitable for being installed in a vehicle engine.

BACKGROUND ART In recent years, from the viewpoint of reducing fuel consumption, there are cases where it is desired to coast a vehicle with engine braking disabled. In such cases, conventionally, this was done by depressing the clutch pedal.

However, such means for interrupting power transmission by depressing the clutch pedal forces the driver to continue depressing the clutch pedal, which is undesirable.

Furthermore, in an automatic transmission type vehicle that is not equipped with a clutch pedal, the above-mentioned operation is not possible, so it is not possible to coast the vehicle with the engine brake disabled.

The present invention attempts to solve these problems by creating a situation in which the engine brake is not effective by cutting off the transmission of power from the tire side to the engine side as necessary. It is an object of the present invention to provide a power transmission device that can reduce fuel consumption with simple operation.

Therefore, in the power transmission device of the present invention, there is a gap between the outer circumferential surface of the inner race and the inner circumferential surface of the outer race.
A first power transmission member capable of transmitting power from the outer race to the inner race in a predetermined rotation direction is interposed, and a second power transmission member capable of transmitting power from the inner race to the outer race in the predetermined rotation direction. A power transmission member is interposed, and the power transmission from the inner race to the outer race via the second power transmission member is interrupted by driving the second power transmission member to the release side. It is characterized by being equipped with a power cutoff mechanism.

Hereinafter, a power transmission device as an embodiment of the present invention will be explained with reference to the drawings. Fig. 1 is a longitudinal sectional view thereof, and Fig. 2 is a transverse sectional view taken along the - arrow line in Fig. 1, showing the crankshaft. A side plate 3 is fastened and fixed to the end surface of 1 with dowel pins 4 and bolts 5.

Further, a ring gear retainer 10 is tightened and fixed to the side plate 3, and a ring gear 9 is shrink-fitted to the ring gear retainer 8.

Further, an annular cam 13 as an outer race is fixed to the side plate 3 by tightening a retainer 15 with special bolts 14a and nuts 14b.

An inner race 17 whose end face is tightened and fixed to the flywheel 2 with dowel pins 20 and bolts 21 is installed in the cam 13, and this inner race 17 is attached to the pilot bearing 18.
It is rotatably supported by a bearing 19 and a bearing 19.

By the way, as shown in FIG. 2, a plurality of power running cam type notches 13a and a plurality of coasting cam type notches 13b are formed on the inner circumferential surface of the cam 13.

When the cam 13 attempts to rotate faster than the inner race 17 in the predetermined rotation direction A, that is, the cam 1 The first power transmission member 16a that can transmit power from the cam 13 (on the crankshaft 1 side) to the inner race 17 (on the flywheel 2 side) when is on the drive side with respect to the inner race 17 (during power running). It has been intervened.

Moreover, when the inner race 17 tries to rotate faster than the cam 13 in the same predetermined rotation direction A, that is, when the inner race 17 tries to rotate faster than the cam 13, When the race 17 is on the drive side with respect to the cam 13 (during coasting), the inner race 17 (flywheel 2 side) to the cam 13 (crankshaft 2 side)
A second power transmission member 16b that can transmit power to is interposed.

Note that the first and second power transmission members 16a, 16
b is constructed as a roller, and each power transmission member 16a, 16b is biased by a spring 27 via a piston 26 in a direction to engage and lock both races 13, 17.

Further, between the outer peripheral stepped portion of the inner race 17 and the flywheel 2, a thrust washer 22,
Bearing 19 and oil seal spacer 23
is interposed.

By the way, by driving the second power transmission member 16b toward the disengagement side, the power transmission from the inner race 17 to the cam 13 via the second power transmission member 16b is cut off, and the engine brake does not work. A power cutoff mechanism D is provided.

In other words, this mechanism D includes the second power transmission member 16 inserted into the coasting cam type notch 13b.
It is provided with a piston 25 that can drive b against a spring 27 toward the release side.

The piston 25 drives the second power transmission member 16b toward the release side by supplying control pressure fluid (pressure oil or compressed air) to the back surface 25a of the piston 25.

Furthermore, the means for supplying control pressure fluid from a fluid pressure source (not shown) to the piston back surface 25a is as follows.

First, the pressure fluid from a fluid pressure source (not shown) is
As shown by arrow B, the feeder is fed to the feeder hole 6a formed in the retainer 6 via the feeder pipe 6c and the feeder joint 6b.

Note that the retainer 6 is attached to the housing 11 by bolts 1.
2 is tightened and fixed.

The pressure fluid supplied to the feeder hole 6a is then supplied to the piston back surface 25a through the annular groove 3a and hole 3b formed in the side plate 3.

Further, a seal ring 7 is interposed between both sides of the groove 3a and the inner surface of the retainer 6, so that the hole 6a with the retainer 6 on the stationary side is connected to the side plate 3 on the rotating side. Pressure fluid can be reliably supplied to the groove 3a.

By the way, a control valve is provided in the middle of the feeder pipe 6c to control the stop of the supply of pressure fluid, and this valve is activated when the foot brake is pressed or when the accelerator pedal is not pressed. When a manual switch etc. is operated, the supply of pressure fluid is stopped and the feeder pipe 6
The pressure from the feeder pipe 6c to the piston back surface 25a is set to the reservoir pressure, and the pressure from the feeder pipe 6c to the piston back surface 25a is switched to a predetermined pressure by supplying pressure fluid elsewhere.

With the above configuration, the cam 13 is connected to the inner race 1.
When powering to rotate faster than 7, the first
Due to the wedge action of the power transmission member 16a, power is transmitted from the cam 13 to the inner race 17 via the first power transmission member 16a.

In addition, when the inner race 17 is coasting to rotate faster than the cam 13 and no pressure fluid is acting on the piston back surface 25a, that is, when the above-mentioned foot brake or the like is operated, the second power transmission member Due to the wedge action of 16b, power is transferred from the inner race 13 to the second power transmission member 16b.
The signal is transmitted to the cam 13 via the cam 13, thereby effecting engine braking.

Therefore, the vehicle can be safely decelerated by using the engine brake together with a foot brake or the like.

By the way, when the foot brake etc. are not operated during coasting, a predetermined fluid pressure is applied to the back surface 25a of the piston 25 due to the action of the control valve.
As a result, the second power transmission member 16b can be driven toward the release side against the spring 27, and as a result, the power is transferred from the inner race 17 to the cam 13 via the second power transmission member 16b. Transmission can be blocked. This allows coasting to continue without engine braking.

In this way, engine braking can be applied or deactivated as needed, so fuel consumption can be significantly reduced with a simple operation.

Note that instead of using rollers as the first and second power transmission members, members of various shapes (eg, gourd-shaped or barrel-shaped in cross section) may be used.

As described above in detail, the power transmission device of the present invention is configured so that transmission of power can be appropriately interrupted during coasting, so there is an advantage that fuel consumption can be significantly reduced with simple operation.

[Brief description of the drawings]

The figures show a power transmission device as an embodiment of the present invention, in which FIG. 1 is a longitudinal cross-sectional view thereof, and FIG. 2 is a cross-sectional view taken along the - arrow line in FIG. 1...Crankshaft, 2...Flywheel, 3...Side plate, 3a...Groove, 3b...
...hole, 4...dwell pin, 5...bolt, 6...
...Retainer, 6a...Feeder hole, 6b...Feeder joint, 6c...Feeder pipe, 7...
...Seal ring, 8...Ring gear retainer, 9
... Ring gear, 10 ... Bolt, 11 ... Housing, 12 ... Bolt, 13 ... Cam as outer race, 13a ... Cam type notch for power running,
13b...Cam type notch for coasting, 14a...Special bolt, 14b...Nut, 15...Retainer,
16a...first power transmission member, 16b...second
power transmission member, 17...inner race, 18...
...pilot bearing, 19...bearing,
20...Dwell pin, 21...Bolt, 22...
...Thrust washer, 23...Oil seal spacer, 25...Piston, 25a...Piston back, 26...Piston, 27...Spring, A
...Arrow indicating a predetermined rotation direction, D...Power cutoff mechanism.

Claims (1)

[Scope of utility model registration request] Between the outer circumferential surface of the inner race and the inner circumferential surface of the outer race, there is a first
A power transmission member is interposed, and a second power transmission member capable of transmitting power from the inner race to the outer race in the predetermined rotational direction is interposed, and the second power transmission member is interposed. A power transmission device comprising a power cutoff mechanism that cuts off power transmission from the inner race to the outer race via the second power transmission member by driving toward the release side.