JP5637779B2 - Torque limiter - Google Patents

Description

  The present invention relates to a torque limiter, and is used, for example, as a part that protects a motor, a blind lifting operation member, and the like from applying an excessive operating force in a toilet seat of an electric opening / closing toilet or a blind lifting device. The

    As this type of torque limiter, an inner shaft provided with ridges on the outer peripheral surface, a hollow cylindrical outer shaft provided with a first needle roller in a slit provided on the outer peripheral wall, and spring means provided on the outer peripheral surface of the outer shaft The inner shaft and the outer shaft are relatively rotatable, and when one of the inner shaft and the outer shaft rotates, the protrusion and the first needle roller are engaged with each other to the other of the inner shaft and the outer shaft. Rotational torque is transmitted, and the biasing force of the spring means is set to allow one of the ridge and the needle roller to get over the other when excessive torque acts on one shaft, and the excessive torque is Conventionally known are those which are not transmitted to the shaft. (For example, refer to Patent Document 1).

Japanese Patent Laid-Open No. 10-89376

A conventional torque limiter of this type uses a ring-shaped spring means as a spring means for pressing the needle roller. Therefore, a large-diameter ring-shaped spring can be arranged in a relatively small space between the outer shaft and the inner shaft, and there is an advantage that a large set torque can be obtained despite the compact configuration. However, in spite of this advantage, the conventional torque limiter uses a protrusion for locking the needle roller, so that play is generated in the rotation direction by the distance between the needle roller and the protrusion. End up. For this reason, when the rotation direction changes, the function as a torque limiter cannot be achieved immediately, and this impairs the commercial value of the torque limiter using a ring-shaped spring member.
The main object of the present invention is to provide a torque limiter having a high commercial value by solving the above-mentioned problem of play while making it possible to obtain a large torque in a small space by taking advantage of the configuration using a ring-shaped spring member. It is to be.

In order to achieve the above object, the present invention provides:
An outer member;
An inner member inserted into the inner diameter portion of the outer member and rotatable relative to the outer member;
A circular cross-section member interposed between an outer diameter portion of the inner member and an inner diameter portion of the outer member, and positioned in one of the inner member and the outer member in the rotational direction; and the inner member and the outer member And a groove portion that fits and holds the circular cross-section member,
It comprises a ring-shaped spring member that presses the circular cross-section member against the groove.
According to the present invention, a vertical portion is provided on one of the inner member and the outer member, a protrusion that protrudes at a predetermined interval is provided on the vertical portion, and the circular cross-section member is disposed between the protrusions. The position of the circular cross-section member in the rotational direction is restricted to one of the inner member and the outer member by the protrusion.
According to the present invention, the circular cross-sectional member is a round bar-shaped needle roller or ball.
According to the present invention, the ring-shaped spring member is a coil spring.
In addition, the present invention is characterized in that the concave portion of the groove portion has a concave curved surface that matches the curved surface of the circular cross-sectional member.

  In the configuration using the ring-shaped spring member, the present invention can immediately function as a torque limiter even if the rotation direction changes.

It is a BB sectional view of a torque limiter. It is an AA line sectional view of a torque limiter. It is a left view of a torque limiter. It is the DD sectional view taken on the line of the torque limiter which shows other embodiment of this invention. It is the CC sectional view taken on the line. It is the left side view. It is the EE sectional view taken on the line of a multiple type torque limiter. It is the FF sectional view taken on the line. It is the left side view.

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.
FIG. 1 is a sectional view of a torque limiter according to the present invention. The torque limiter includes a cylindrical outer member (2), an inner member (4) composed of a hollow shaft that is rotatable relative to the outer member, a ring-shaped spring member (6) composed of a coil spring, and a round bar shape. A circular cross-section member (8) made of a metal needle roller is used as a main component.

The outer member (2) is made of zinc die cast, and a disk-shaped vertical portion (2b) is formed in the vicinity of one end of the cylindrical main body (2a). On the inner surface of the vertical part (2b), a plurality of protrusions (2c) project in the axial direction toward the inside of the main body (2a) with a predetermined interval in the circumferential direction of the main body (2a). It is installed. The curvature of the inner peripheral surface (2d) of each protrusion (2c) facing the inner member (4) is set to be substantially the same as the curvature of the outer peripheral surface of the inner member (4). ) Is in contact with the outer peripheral surface of the inner member (4) so as to be rotatable relative thereto.

Both side surfaces (2e) (2e) of each projection (2c) in the direction along the circumferential direction of the main body (2a) are formed substantially perpendicular to the circumferential direction, and each projection (2c) ) Between the opposing side surfaces (2e) and (2e) (d), the circular cross-section member (8) is fitted and arranged so as to be movable in the direction of contact with and away from the outer peripheral surface of the facing inner member (4). ing. The circular cross-sectional member (8) is arranged so that its longitudinal direction is parallel to the axial direction of the main body (2a), and the circular cross-sectional member (8) is a direction along the inner peripheral surface of the main body (2a). Is restricted by the protrusion (2c).

That is, the circular cross-sectional member (8) is disposed between the protrusions (2c) and (2c) so as to be interlocked with the rotation of the outer member (2), and the position of the circular sectional member (8) is regulated by the outer member (2). On the outer peripheral surface of the inner member (4), a plurality of grooves (10) having an arcuate cross section extending in the axial direction are formed at predetermined intervals in the circumferential direction of the inner member (4). . In this embodiment, as is clear from FIG. 1, twelve groove portions (10) twice as many as six circular cross-section members (8) are provided. The groove (10) has a concave curved surface corresponding to the circumferential surface of the circular cross-sectional member (8), and the circular cross-sectional member (8) is fitted to the concave curved surface. The curvature of the concave surface of the groove (10) is set to be substantially the same as the curvature of the peripheral surface of the circular cross-section member (8).

A spring arrangement space (12) is provided between the protrusion (2c) and the main body (2a), and each protrusion (2c) is provided with an outer member (12) by the spring arrangement space (12). A spring receiving surface (2f) having the same curvature as the inner peripheral surface of 2) is formed. In the spring arrangement space (12), a spring member (6) having a ring-shaped side surface is fitted and arranged, and the spring member (6) has an inner diameter portion which is a spring receiving surface of each protrusion (2c). (2f) and the circular cross-section member (8) are in elastic contact. In the present embodiment, the spring member (6) is a coil spring.

The circular cross-section member (8) is pressed toward the inner member (4) by the elastic force of the spring member (6) in the reduced diameter direction, and is pressed against the groove (10) by the elastic force. Plastic caps (16) and (18) are fitted to both ends of the outer member (2) in the axial direction. A shaft hole having a detent (14) is formed in the center of the shaft of the inner member (4), and a required rotation shaft such as a motor cannot be rotated by the detent (14) in the shaft hole. It is configured to be plugged in.

The torque transmission of the inner member (4) to the outer member (2) through the rotating shaft, or vice versa, is the torque transmission of the outer member (2) to the inner member (4). And the engagement with the groove (10), and the magnitude of the set torque is the urging force of the spring member (6), the engagement depth between the circular cross-section member (8) and the groove (10), etc. Can be determined by. Torque limiters are installed in electric toilet seats and blind lifts, etc., and are used to protect toilet toilet motors and reducers, and to protect the blind lift device when excessive operating force is applied. . In addition, this torque limiter is installed in a place where a large torque limiter is required in a small space.

  In the above configuration, when the acting torque between the inner member (4) and the outer member (2) is smaller than the set torque, the inner member (4) and the outer member (2) are interposed via the circular cross-section member (8). The state where they are connected to each other in the rotational direction is maintained. In this state, each circular cross-section member (8) is closely fitted in the corresponding groove (10), and the rotational force in the relative rotational direction of the inner member (4) and the outer member (2) is changed to either the forward or reverse direction. Even if it does, play does not arise between a circular cross-section member (8) and a groove part (10), and rotation is transmitted.

When the acting torque between the inner member (4) and the outer member (2) becomes larger than the set torque, and excessive torque acts between the two members, the circular cross-section member (8) resists the spring pressure from the groove (10). And moves along the outer peripheral surface of the inner member (4) so that the inner member (4) is idle relative to the outer member (2) or the outer member (2) is moved relative to the inner member (4). The excess torque transmitted from the inner member (4) to the outer member (2) or transmitted from the outer member (2) to the inner member (4) is released.

In the said embodiment, although it has the structure which provided the groove part (10) in the inner side member (4) side and fitted and arrange | positioned the circular cross-section member (8) in this, a groove part (10) is the outer member (2). ) Side may be provided.
Next, an embodiment of a torque limiter in which the groove (10) is provided on the outer member (2) side will be described with reference to FIGS.

  In the vicinity of one end of the inner member (4), a disk-shaped vertical portion (4b) protruding outward is provided, and the vertical portion (4b) is directed inward of the inner member (4) in the axial direction. A plurality of protrusions (4c) are provided to protrude in the circumferential direction of the inner member (4) at a predetermined interval. The curvature of the outer peripheral surface (4d) facing the outer member (2) of each protrusion (4c) is set to be substantially the same as the curvature of the inner peripheral surface of the outer member (2), and the outer peripheral surface (4d) is The outer member (2) is in contact with the inner peripheral surface of the outer member (2) so as to be relatively rotatable.

The circular cross-section member (8) is fitted between the side surfaces (4e) and (4e) of the projections (4c) so as to be movable in the direction of contact with and away from the inner peripheral surface of the outer member (2) facing each other. Has been. The circular cross-section member (8) is restricted from moving in the direction along the outer peripheral surface (4f) with respect to the inner member (4) by the protrusion (4c). On the inner circumferential surface of the outer member (2), a plurality of grooves (10) having an arcuate cross section extending in the axial direction are formed at predetermined intervals in the circumferential direction of the outer member (2). Yes.

A circular cross-section member (8) is fitted into the concave curved surface of each groove (10). A spring arrangement space (12) is provided between the projection (4c) and the main body (4a) of the inner member (4), and the spring member (6) is fitted and arranged in the spring arrangement space (12). The outer diameter of the spring member (6) is in elastic contact with the spring receiving surface (4g) of each protrusion (4c) and the circular cross-section member (8). Each circular cross-section member (8) is pressed in the direction of the outer member (2) by the elastic force of the spring member (6) in the diameter increasing direction, and is pressed against the groove (10) by the pressure elastic force. . Other configurations are the same as those of the first embodiment shown in FIGS. 1 to 3, and the same reference numerals are assigned to clarify the correspondence.

  In the above configuration, when the acting torque between the inner member (4) and the outer member (2) is smaller than the set torque, the inner member (4) and the outer member (2) are connected via the circular cross-section member (8). The state where they are connected to each other in the rotational direction is maintained. In this state, in the fitting state, that is, the engagement state between the groove (10) and the circular cross-section member (8), there is no play for both the forward and reverse rotational forces, and the rotation is transmitted.

When the acting torque between the inner member (4) and the outer member (2) becomes larger than the set torque, and an excessive torque acts between them, the circular cross-section member (8) resists the elasticity of the spring member (6), It moves away from the groove (10) and moves along the inner peripheral surface (2g) of the outer member (2), and the inner member (4) is idle with respect to the outer member (2), or the outer member (2) is inner. The excessive torque transmitted idly with respect to the member (4) and transmitted from the inner member (4) to the outer member (2) or transmitted from the outer member (2) to the inner member (4) is released.

  In the above embodiment, a torque limiter mechanism comprising a single spring member (6) and a plurality of circular cross-section members (8) corresponding thereto is provided between the inner member (4) and the outer member (2). However, this torque limiter mechanism may have a multiple structure in which a plurality of stages are arranged in the axial direction of the inner member (4) and the outer member (2). 7 to 9 show an embodiment of a torque limiter having a double-type torque limiter mechanism.

In this embodiment, a vertical portion (2b) is formed at the center of the outer member (2), and a torque limiter mechanism having a spring member (6) and a circular cross-section member (8) is provided on the left and right of the vertical portion (2b). It has been. Since the configuration of each of the left and right torque limiter mechanisms is the same as that of the first embodiment shown in FIGS. 1 to 3, the same reference numerals are given to corresponding portions, and the description thereof is omitted. Similarly, the torque limiter mechanism of the second embodiment shown in FIGS. 4 to 6 can have a multiple structure.

  In the above embodiment, the spring member (6) is a coil spring. However, the spring member (6) is not particularly limited to the coil spring, and a plate spring having a tubular shape or a half tubular body having an open portion may be used. good. The circular cross-section member (8) can be a ball such as a steel ball or the like other than the needle roller. Further, the cross-sectional shape of the groove (10) is not particularly limited to the same arc shape as the curvature of the peripheral surface of the circular cross-section member (8), but a rectangular or other recess that receives the peripheral surface of the circular cross-section member (8). Any shape may be used as long as it is a shape.

2 Outer member 2a Main body 2b Vertical portion 2c Protruding portion 2d Inner peripheral surface 2e Side surface 2f Spring receiving surface 2g Inner peripheral surface 4 Inner member 4b Vertical portion 4c Protruding portion 4d Outer peripheral surface 4e Side surface 4f Outer peripheral surface 4g Spring receiving surface 6 Spring member 8 Circular cross-section member 10 Groove portion 12 Spring arrangement space 14 Detent 16 Cap 18 Cap

Claims (3)

An outer member having a tubular body ;
An inner member inserted into the inner diameter portion of the outer member and rotatable relative to the outer member;
A circular cross-section member interposed between an outer diameter portion of the inner member and an inner diameter portion of the outer member, and positioned in one of the inner member and the outer member in the rotational direction; and the inner member and the outer member And a groove portion that fits and holds the circular cross-section member,
A ring-shaped spring member that presses the circular cross-section member against the groove,
A vertical portion is provided on one of the inner member and the outer member, a protrusion that protrudes at a predetermined interval is provided on the vertical portion, and the circular cross-section member is disposed between the protrusions, and the protrusion The circular cross-section member is positioned in one of the inner member and the outer member in the rotational direction, the concave portion of the groove conforms to the curved surface of the circular cross-section member, and a concave curved surface having the same curvature as the curved surface is formed. A spring disposition space is provided between the protrusion and the inner diameter portion of the outer member, the ring-shaped spring member is fitted and disposed in the spring disposition space, and a rotation stop is provided at the center of the shaft of the inner member. A shaft hole is formed, and both side surfaces of each projection in the direction along the circumferential direction of the main body are formed substantially perpendicular to the circumferential direction, and between the opposing side surfaces of each projection. , The circular cross-section member, one of the inner member and the outer member facing each other Torque limiter, characterized in that the fitting arranged to be movable in the direction toward and away from to the plane. The torque limiter according to claim 1, wherein the circular cross-section member is a round bar-shaped needle roller or ball. The torque limiter according to claim 1, wherein the ring-shaped spring member is a coil spring.

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