JPH06147237A - Torque limitter - Google Patents

Abstract

PURPOSE:To embody a torque limitter which reduces torque with convensional viscous fluid being utilized as resistance. CONSTITUTION:An endless sealed flow passage 2 in which oil is sealed is formed on a main body 1, while a circular empty chamber 5 is formed on a proper portion of the sealed flow passage 2. A trochoid pump A is rotatably assembled with a clearance of a reference value in respect to an inner peripheral surface of the empty chamber 5. Outflow and inflow ports 8, 8' are opened to the sealed flow passage 2. A shaft 14 of an internal gear 7 of the trochoid pump A serves as an input/output shaft 13, which shaft 14 is projected outside of the main body 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention incorporates a trochoid pump at an appropriate place of an endless closed flow passage in which oil is enclosed, and controls the input rotation to the trochoid pump by the resistance of the oil to reduce the decelerated output rotation. To get a torque limiter.

[0002]

2. Description of the Related Art Generally, in a conventional torque limiter, for example, a pressing member such as a ball or a roller is pressed against a recess formed in a disc with a certain pressure set appropriately to connect both the pressing member and the disc. A structure in which the rotation is transmitted by means of a structure in which the pressing body separates from the recess and slips on the disk surface against overload is often used, and the required rotation mechanism is rotated at a constant tension, or It was used for the purpose of protecting the drive source in the rotating device.

By the way, the pressing force of the pressing body is set in advance,
In order to keep this set state constant, it is usual to use the elastic force of the spring, and the adjustment of the elastic pressure is done by tightening or tightening the adjusting bolt, or nut, etc., the mechanism as a whole, The structure became complicated, and the product had to be expensive.

Further, with respect to an overload, the pressing member such as a ball pressed by the elastic force of the spring is detached from the recess of the disk and slips on the disk surface. Or, there is a possibility that mechanical pressure such as wear will occur in the pressing body, which may cause unexpected change of the preset pressure, such as wear inspection of the mechanism and adjustment of spring elastic pressure. Always needed maintenance and inspection.

Therefore, the appearance of a torque limiter, which has a simple mechanism and structure, can be manufactured at low cost, and is easy to maintain and inspect, is desired, and the applicant has incorporated a gear pump in a sealed flow passage containing a viscous fluid. It has come to provide a type in which a viscous fluid is used as a resistance to reduce the torque.

However, in the torque limiter using the gear pump, since the gear pumps are installed in parallel, the size of the device is inevitably increased, which may be an obstacle to actual use.

[0007]

A problem to be solved is that a conventional torque limiter of a type for reducing a torque by using a viscous fluid as a resistance is large in size.

[0008]

SUMMARY OF THE INVENTION The present invention is directed to an endless closed flow channel formed in a main body and containing oil, a circular cavity formed in an appropriate position of the closed flow channel, and an inner circumference of the cavity. A trochoid pump having a standard clearance between the trochoidal surface and the surface and having an outflow port opened to the closed flow path 2 and a shaft of an internal gear of the trochoid pump are projected outward from the main body. It consists of an input / output axis.

Further, it is preferable to incorporate a flow rate adjusting valve having an operating portion outside the main body into the closed flow path.

Further, a bypass flow path provided with a check valve may be diverted to the closed flow path.

[0011]

By continuously inputting a constant rotational force to the input / output shaft, the internal gear of the trochoid pump rotates, and the external gear also starts to rotate accordingly.
The rotation of the two tries to move the oil enclosed in the closed channel from one outflow port to the other outflow port,
Since it is a closed flow path, the flow of oil receives resistance, the rotational force of the internal gear is controlled, and the input / output shaft outputs a rotational force that is decelerated from the input rotational force.

The rotational force of the input / output shaft, which has been once decelerated, is accelerated by the constant rotational force continuously input, and the pumps by both gears are activated again by this accelerated rotation, and the rotational force is decelerated again. As a result of this state being repeated, the rotational force of the input / output shaft is controlled.

Further, by incorporating a flow rate adjusting valve provided with an operating portion outside the main body into the closed flow passage, the amount of oil flowing through the closed flow passage can be arbitrarily adjusted, and the rotational force of the input / output shaft can be adjusted. The control can be made more reliable.

Further, by providing the check valve by dividing the bypass flow path into the closed flow path, the check valve is activated by the oil flow when the input / output shaft rotates in one direction. The bypass flow passage is closed, and the flow of oil is concentrated in the closed flow passage to maximize the control function of both gears, and input / output only when rotating in one direction to the input / output shaft. The rotational force in one direction of the shaft is controlled and output.

On the other hand, when the input / output shaft rotates in the other direction, the flow of oil in the closed flow path becomes the other direction, and the check valve in the bypass flow path remains open, so that the oil flow Is divided into a closed flow path and a bypass flow path, and the amount passing through the bypass flow path becomes large, and both gears merely perform the function of moving oil. That is, when the input / output shaft is rotationally input in the other direction, the input / output shaft is rotationally output in the input state without controlling the rotational force.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. Reference numeral 1 is a main body having an endless closed flow passage 2 in which oil is sealed. For example, a material having a small linear expansion coefficient such as cast iron. The main body 1 includes a main body 3 and a lid body 4.
It consists of and.

Reference numeral 5 denotes an empty chamber formed at a proper position in the closed flow path 2. In this empty chamber 5, a trochoid pump A composed of an external gear 6 and an internal gear 7 is provided, and an inner peripheral surface of the empty chamber 5 is formed. The trochoid pump A has the outflow inlets 8 and 8'opened in the closed flow path 2 while being rotatably incorporated with a standard clearance required for rotation between the two.

Reference numeral 9 denotes a flow rate adjusting valve incorporated in the closed flow passage 2, and an operation portion 10 provided outside the main body 1 artificially adjusts the oil flow in the closed flow passage 2. Reference numeral 11 denotes a bypass flow path formed by dividing the endless closed flow path 2.
A check valve 12 that opens and closes depending on the direction of oil flow is provided. 13 is a shaft 14 of the internal gear 7 of the trochoid pump A
Is an input / output shaft formed by projecting from the main body 1.

[0019]

As described above, the present invention utilizes the flow of oil enclosed in the endless closed passage of the main body, and outputs the rotational force input to the input / output shaft by controlling the resistance of the oil. It is possible and its structure is extremely simple.

Since the trochoid pump is incorporated for controlling the rotational force, the device as a whole can be made smaller and lighter, which is convenient for actual use.

Moreover, the flow rate adjusting valve incorporated in the closed flow path is adjusted by an operating portion provided outside the main body, whereby the fine adjustment of the flow rate of the oil flowing through the closed flow path can be performed arbitrarily. The rotation output control of the input / output shaft can be adjusted more accurately according to the surrounding conditions.

Further, by shunting the bypass flow passage into the closed flow passage and providing the check valve, the rotation output of the input / output shaft can be controlled only when the rotation input in one direction is input to the input / output shaft.
Rotation of the input / output shaft in the other direction is free. For example, the movement of the door body in the opening direction can be performed rapidly and the movement in the closing direction can be slow, as in a braking device for an automatic closing sliding door. It can be conveniently used for things.

[Brief description of drawings]

FIG. 1 is a plan view with a lid removed.

2 is a cross-sectional view of the main body taken along line XX of FIG.

3 is a cross-sectional view of the main body taken along line YY of FIG.

FIG. 4 is a schematic explanatory diagram.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main body 2 Closed flow path 5 Vacancy 6 External gear 7 Internal gear 8,8 'Outflow inlet 9 Flow control valve 10 Operation part 11 Bypass flow path 12 Check valve 13 Input / output shaft 14 Shaft A Trochoid pump

Claims (3)

[Claims] 1. An endless closed flow channel (2) formed in a main body (1) and filled with oil, a circular empty chamber (5) formed in an appropriate position of the closed flow channel (2), and an empty space. Trochoid pump A, which is rotatably installed with a standard clearance between it and the inner peripheral surface of the chamber (5), and has the outflow inlets (8), (8) 'opened to the closed flow path 2 and a trochoid pump. A torque limiter including an input / output shaft (13) formed by projecting the shaft (14) of the internal gear (7) of A from the outside of the main body (1). 2. The torque limiter according to claim 1, wherein the closed flow path (2) incorporates a flow rate adjusting valve (9) provided with an operating portion (10) outside the main body (1). 3. The bypass flow passage (11) provided with a check valve (12) is diverted to the closed flow passage (2).
Torque limiter described.