JPH0535768B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention is characterized in that a shaft joint is capable of controlling transmittable torque, has two joint bodies each fixedly connected to a shaft, and has two joint bodies fixedly connected to a shaft. a first joint body of which is configured as a planetary gear carrier of a planetary gearset;
A shaft coupling comprising at least one planetary gear, which planetary gear meshes with a sun gear of a planetary gear train constituting a second coupling body, and together with this sun gear forms a gear pump.

[Conventional technology]

Shaft couplings capable of controlling the transmittable torque are known in various configurations. Such joints also include so-called multi-plate joints, the laminae of which can be pressed against each other by means of a piston under the action of a pressure medium in order to increase their frictional connection, and in each case the transmittable torque is increased between adjacent laminae. It is determined by the slippage related to the pressing force. If the control processes are frequent or the sliding of the laminate continues for a long time, the temperature of the laminate increases strongly, necessitating costly additional cooling and also with significantly increased wear. Furthermore, hydrostatic transmissions having a pump part and a motor part are known, in which a piston connected in a hydraulic linkage is supported in the pump part and in the motor part and respectively cooperates with a swash plate, which The transmittable torque can be controlled by changing the slope of the swash plate. This makes the structure very complicated and takes up a lot of space. Liquid friction couplings are also known in which a housing, which is finally filled with a highly viscous liquid, forms one coupling body, in which a shaft leading to the outside is supported as a second coupling body. The housing and the shaft are each fixedly coupled to a set of thin plates, the sets of thin plates interlocking in a comb-like manner. The power transmission between the plates is not by frictional engagement between the plates as in conventional multi-plate joints, but by shear forces created in the viscous liquid. The amount of torque that can be transmitted is related to the difference in rotational speed between the two joint bodies. It is difficult to arbitrarily control the transmittable torque, and in particular, even if the transmittable torque is controlled, it is impossible to reduce it to zero. It is also disadvantageous that the viscosity of the liquid changes with temperature.

[Problem that the invention seeks to solve]

The object on which the invention is based is therefore to eliminate these drawbacks, to make it possible to control the transmittable torque down to zero, to operate independently of slippage between the wearing surfaces and to be able to avoid changes in the viscosity of the liquid. It is an object of the present invention to provide a shaft coupling having a relatively simple structure that is not actually affected by the

[Means for solving problems]

In order to solve this problem, according to the invention, the suction and discharge sides of a gear pump in a closed hydraulic circuit are connected by a connecting channel in which a controllable throttle is inserted.

〔Effect of the invention〕

In this shaft coupling, the supporting force of the shaft of the gear, which together with the second coupling body configured as a sun gear or an internal gear forms the gear pump, produces a reaction torque on the first coupling body, and the supporting force and therefore the reaction force The magnitude of the torque depends on the respective free cross section of the throttle. If the throttle is completely closed, theoretically there will be a complete torque transmission, and if the connecting channel is completely opened by the throttle, the liquid medium discharged on the closed side will be sucked in unprotected. Since it flows to the side, the transmitted torque decreases to zero. If not only one gear pump but also two or more gear pumps are formed by two or more gear wheels supported in the first coupling body, the dimensions of the gear wheels can be reduced and advantageous effects can be achieved. can get.

In this case, a further development of the invention provides that the connecting ducts each lead from the delivery side of one gear pump to the suction side of the adjacent gear pump and each have a controllable throttle, so that the connecting ducts It is significantly shorter, which is advantageous for placement.

〔Example〕

Of both joint bodies, the joint body connected to the driven shaft 1 has a plurality of parts 2, 3, held together by screws.
4 and is configured like a planetary gear carrier including three planetary gears 5. A drive shaft 6 is supported in this coupling body, which is designed as a planetary gear carrier, on which a sun gear 7 is fixed as a second coupling body. The sun gear 7 together with the three planetary gears 5 each form a gear pump, the suction side of which is designated by 8 in the direction of rotation indicated by the arrows in FIG. 2, and the discharge side by 9. . A connecting channel 10 leads in each case from the discharge side 9 of one gear pump to the suction side 8 of the adjacent gear pump. A throttle formed by a pin 11 movable parallel to the axis is inserted into each of these connecting passages 10 . In the position shown, the connecting channel 10 is completely closed, so that virtually all the torque is transmitted from the shaft 6 to the shaft 1. If, on the other hand, the pin 11 is pulled out of the part 2 by the actuating ring 12, the hydraulic medium can flow from pump to pump, and the transmittable torque is determined by the respectively opened throttle section of the connecting channel 10. Ru. When the cross section is fully opened, no torque transmission takes place.

The parts 2, 3, 4 are complemented by the lid part 13 to form a leak-tight enclosing housing, which is completely filled with the liquid medium.

[Brief explanation of the drawing]

FIG. 1 is a sectional view taken along the axis of the shaft joint, and FIG. 2 is a sectional view taken along the line - in FIG. 1, 6...Shaft, 2-4; 7...Joint body, 5...
Planetary gear, 8...Suction side, 9...Discharge side, 10...
...Connection passage, 11...Aperture.

Claims (1)

[Claims] 1. The shaft joint is capable of controlling the transmittable torque and has two joint bodies each fixedly connected to the shaft, and the first joint body of the two joint bodies is connected to the planetary gear device. The planetary gear carrier is configured as a planetary gear carrier and includes at least one planetary gear, the planetary gear being a second planetary gear.
In a gear pump that meshes with the sun gear of a planetary gear set that constitutes the joint body of the gear pump and forms a gear pump together with the sun gear, the suction side 8 and the discharge side 9 of the gear pump in a closed hydraulic circuit are connected to each other. , a shaft coupling characterized in that it is connected by a connecting passage 10 into which a controllable throttle 11 is inserted. 2 Joint body 2 configured as a planetary gear carrier
Two or more planetary gears 5 supported in ~4 each form one element of a gear pump, with a connecting passage 10 in each case from the discharge side 9 of one gear pump to the adjacent gear pump. Suction side 8
2. A shaft coupling according to claim 1, characterized in that the shaft couplings have one controllable throttle (11) in each case.