JPH0314728A - Power transmitting device - Google Patents

Abstract

PURPOSE:To maintain the initial transmitting characteristic stably for a long period by coupling the crank shaft of engine with the drive shaft through a hysteresis clutch which is controlled by a solenoid, and thereby performing torque transmission contactlessly. CONSTITUTION:A crank shaft 1 in direct coupling with an engine and a drive shaft 11 arranged concentrically therewith are coupled together through a hysteresis clutch D. A reversing device B is incorporated in the drive shaft 11. A continuous transmission C is installed between this drive shaft 11 and a driven shaft 22 arranged in parallel therewith. The clutch D is accomplished in such a construction that a driving piece 25 made of a hysteresis material is fixed to a drive plate 2 fastened on the crank shaft 1, and that a follower member 26 having magnetic pole 26a constituting different poles alternately at the periphery is provided facing to the driving piece 25 with a ring-shaped gap (g) interposed. Current is supplied to a solenoid 5 to generate magnetic flux, and the torque is transmitted from the driving piece 25 to follower member 26 contactlessly.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a power transmission device that transmits driving force from, for example, an automobile engine to wheels via a continuously variable transmission.

[Conventional technology]

FIG. 2 is a longitudinal sectional side view showing a conventional power transmission device disclosed in, for example, Japanese Patent Application Laid-Open No. 57-190155. In the figure, (1) is a crankshaft directly connected to an engine (not shown); (2) is a drive plate that is bolted to the crankshaft (1) and has a ring gear (33) fixed to its outer periphery, (4) is a dophip member fixed to the drive plate (2), and (5) is a drive plate (4). The excitation coil/L' (6) is accommodated in the recess of the drive member (4).
) and for feeding power to the excitation coil A' (5), (7) is the slip ring (
6] A pair of brushes that are always in sliding contact with a predetermined pressure, (8) is a driven member that faces the dope member (4) through an annular cavity ta<gJ, and (9) is a magnetic particle enclosed in an annular cavity @ (g). , (10) is a boss that is fixed to the dripun member + (8.) and has a spline!Is (106) formed on its inner peripheral surface. The drive shaft is fitted and inserted into the housing (l2) so as to be slidable in the direction, and is rotatably mounted on the housing (l2), and (l3) is a sun gear fixed to the drive shaft (ll), which performs the known ebicycloid reverse rotation. (14) is a planetary gear disposed around the sun gear (l3) at a predetermined interval.
3) meshes with each other. (15) is a separate planetary gear that meshes with the planetary gear (14), and (16) is a crown gear that is disposed concentrically with the sun gear (14) and is always meshed with the planetary gear (15). And both planetary gears (14). (
15) is the rotation of the drive shaft (11).
1) is rotatably supported by a support member (18) fixedly fixed to a hollow main shaft (17). The counter gear (16) has a friction grate (2) operated by fluid pressure through a conventionally well-known fluid circuit (not shown).
0). That is, the friction clutch (19) functions to connect the crown gear (16) and the support member (1B) so that they rotate together, and the friction clutch (20) in the housing connects the crown gear (16) to the support member (1B) so that they rotate together.
16) to the housing (12), which is a fixed member. The drive IN (
1 1), and the crown [t(16)
is locked to the housing (12) and the support member (18)
The hollow main shaft (17) is configured to rotate in the opposite direction to the drive shaft (1l). (2l) is the driving gear fixed to the main shaft (l7). J(211j: Two conical disks (21a).(2lb)'t=equipped opposite to each other.

And these 10,000 disks (21a) are the main shaft (17)
One disk and the other (2lb)
is supported by the main shaft +111 (17) so as to be freely slidable about 10,000 times. 1, the drive boley (21) faces the driven shaft (23) which is integral with the driven shaft (22) arranged parallel to the main shaft (l7),
4) The rotation of the main shaft (17) is transmitted to the driven shaft (22) via t. Among them, the driven pulley (
23) Structure or drive poo! j (21) and Ashi Mukasama, 2
conical disks (23a). (23b) t-, one of which disks (23a) is a driven shaft (22
), and the other disc (23b
) is slidably supported on all shafts of the shaft (22).

And the driving poo! J (21) and driven gooley (2
3) disk (2lb). The axial movement of (23b) is caused by the movement of the chamber (21a) in contact with each disk (2 l b ), (23b). (23o) by conventional means for injecting pressurized fluid into (23o), and this operation is performed by a fluid circuit, not shown.

As described above, this power transmission device is a magnetic particle type electromagnetic coupling device (A) (corresponding to symbols (11 to (lO) in the figure).
, a reversing device (B) (corresponding to (11) to (20) in the diagram), and a continuously variable transmission (O] (symbols (2l) to (2) in the diagram)
4)).

[Problem to be solved by the invention]

The conventional power transmission device as mentioned above uses a magnetic particle type electromagnetic coupling device (AJ ft), so if this is used for an automobile, the magnetic particle type electromagnetic coupling device (AJ ft. 7j) EThe temperature is very high at approximately 120℃, and if the connection is performed frequently (starting and stopping the car repeatedly), the magnetic particle type coupling device 1 (A
The temperature of the J body further increases. In particular, the temperature of the magnetic particle portion that generates slip heat becomes extremely high. When used harshly for a long period of time in such a high temperature atmosphere, the magnetic particles become pulverized and oxidized, resulting in a significant decrease in torque. Therefore, there is a problem that a predetermined transmission force cannot be obtained.

This invention was made to eliminate such problems, and by using a magnetic particle type coupling device and a hysteresis clutch instead, long-term harsh operation can be avoided.
To provide a power transmission device which has no consumable parts and can semi-permanently maintain its initial performance by using a hysteresis clutch to transmit torque without contact.

[Means to solve section fflt]

In order to achieve the above object, the power transmission device according to the present invention connects a crankshaft rotated by a mechanical engine and a drive shaft arranged concentrically with the crankshaft through a hysteresis clutch controlled by an excitation coil. A reversing device is built into the drive shaft, and a continuously variable transmission is built between the drive shaft and a driven shaft arranged parallel to the drive shaft.

[For production]

In this invention, since the crankshaft and the drive shaft are connected like a hysteresis clutch, torque is transmitted without contact.

〔Example〕

An embodiment of the invention will be described with reference to FIG. FIG. 1 is a longitudinal cross-sectional side view, and b1 the same or equivalent parts as those of the conventional device are given the same reference numerals and the explanation thereof will be omitted. In the diagram,
(25) is a driving body fixed to the drive plate (2) and made of hysteresis material. (26) is a driven body that faces the driving body (25) via an annular gap (g), and has magnetic poles (2 (
5a) is provided.

Hysteresis clutch (D) as described above (symbol (in the figure)
13 ~ (3), (57 ~ (7), (10), (
10a), (25). (26), (corresponding to (26&)) will be explained.

1. When the excitation coil /L/(5) is energized through the plan (7) and the slip ring (6), the magnetic pole (28a
) to the driver (25), and then the magnetic pole (26&)
Magnetic flux flows to. At this time, υ hysteresis loss occurs due to the magnetic flux passing through the drive body (25).
) to the driven body (26). Among these, the torque at this time is proportional to the loop area of the B-H hysteresis curve of the hysteresis material used for the driver (25). Tsuti excited carp /L/
(5) A torque approximately proportional to the current flowing through the circuit can be obtained.

Next, when the excitation coil (5) is deenergized, the magnetic flux disappears and torque is no longer transmitted from the driving body (25) to the driven body (26).

As mentioned above, hysteresis scratches (
When the DJ t'' is incorporated, torque can be transmitted non-contact rather than through mechanical friction, so a semi-permanently stable torque can be obtained.

The operation as a power transmission device is the same as that of the conventional device, so a description thereof will be omitted.

[Effects of the Invention] As described above, according to the present invention, by using the hysteresis clutch, the hysteresis clutch can transmit the 1st torque without coming into contact even after repeated cycles of harsh operation for a long period of time. In addition, there are no consumable parts, and the initial performance can be maintained semi-permanently. In addition, designing a product that does not cause a drop in transmitted torque eliminates the need to provide a margin to account for this torque drop, and furthermore, the torque is always stable, which has the effect of improving the drivability of the car. Obtained 0

[Brief explanation of drawings]

FIG. 1 is a vertical side view showing an embodiment of the present invention, and FIG. 2 is a vertical side view showing a conventional device. In the figure, (1) is the crankshaft, (2) is the drive plate, (5) is the exciting coil #, (63 is the slip ring, (7) is the brush, (11) is the drive shaft, (22) is Driven shaft, (25) driving body, (26) driven body, (26a
) is the magnetic pole, (B) is the reversing device, (0) is the infinite speed change device,
(D) shows a hysteresis clutch. In the drawings, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Claims] (1) A crankshaft rotated by the engine and a drive shaft arranged concentrically with the crankshaft are connected to each other by a hysteresis clutch controlled by an excitation coil, and a reversing device is attached to the drive shaft. 1. A power transmission device, further comprising: a continuously variable transmission device installed between the drive shaft and a driven shaft arranged parallel to the drive shaft.