JP2004204993A - Torque limiter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To simplify a constitution of a torque limiter mounted between first and second rotating bodies respectively rotatable on one shaft center for interlocking and connecting both rotating bodies. <P>SOLUTION: This torque limiter 15 is mounted between the first and second rotating bodies 13, 14 respectively rotatable on one shaft center 12 for interlocking and connecting both rotation bodies 13, 14 to each other. A cam face 23 is formed on a part of an outer peripheral face of the first rotating body 13, and a joint body 24 is supported on the second rotating body 14 and joined to the cam face 23 for interlocking the first and second rotating bodies 13, 14 to each other. When the transmission torque between the first and second rotating bodies 13, 14 is over a specific value, the joint body 24 is deformed and separated from the cam face 23, whereby the relative rotation of the first and second rotating bodies 13, 14 is permitted. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a torque limiter that is interposed between first and second rotating bodies that are each rotatable around one axis, and that connects these rotating bodies to each other in an interlocked manner.
[0002]
[Prior art]
[0003]
[Patent Document 1] Japanese Patent Application Laid-Open No. 2002-120996
Conventionally, as the torque limiter, there is a torque limiter disclosed in Patent Document 1 described above. According to this, the torque limiter is interposed between the first and second rotating bodies that are individually rotatable about one axis, and these two rotating bodies are interlocked and connected to each other. More specifically, a load is connected to the first rotator, and the second rotator is operatively connected to an electric motor. The torque limiter includes a ball which is removably fitted into a ball hole formed on an axial end face of the first rotary body and a second rotary body which is axially opposed to an end face of the first rotary body. An elastic body interposed between the end face and the ball, and elastically biasing the ball to fit into the ball hole;
[0005]
When the electric motor is driven, the second rotator drives the first rotator via a torque limiter. Then, the luggage is moved in a desired direction by the first rotating body. Here, if the load from the load becomes excessive and the transmission torque from the second rotator to the first rotator exceeds a predetermined value, the transmission torque reduces the elastic force of the elastic body. The ball separates from the ball hole while opposing, and the electric motor idles with the second rotating body with respect to the first rotating body. Thus, the electric motor, the first rotating body, and the second rotating body are prevented from being subjected to an unreasonable load from the load, and the electric motors and the like are prevented from being damaged.
[0006]
[Problems to be solved by the invention]
By the way, according to the above-mentioned conventional technology, the torque limiter includes a ball fitted into a ball hole formed in the first rotating body and an elastic body for urging the ball. However, there is a problem that the configuration of the torque limiter is complicated.
[0007]
SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to provide a torque limiter having a simple configuration.
[0008]
[Means for Solving the Problems]
The torque limiter of the present invention for solving the above problems is as follows. Note that the reference numerals added to the terms in this section do not limit the technical scope of the present invention to the contents of the “Embodiments of the Invention” described below.
[0009]
According to the first aspect of the present invention, a torque is provided between the first and second rotating bodies 13 and 14 which are rotatable around one axis 12 respectively, and the two rotating bodies 13 and 14 are connected to each other in an interlocked manner. Limiter 15,
[0010]
A cam surface 23 is formed on a part of the outer peripheral surface of the first rotator 13 and supported by the second rotator 14 and joined to the cam surface 23 to connect the first and second rotators 13 and 14 to each other. When the transmission torque between the first and second rotating bodies 13 and 14 exceeds a predetermined value, the joined body 24 is deformed and detached from the cam surface 23, and The first and second rotating bodies 13 and 14 are allowed to rotate relative to each other.
[0011]
According to a second aspect of the present invention, in addition to the first aspect, the cam surface 23 is a flat surface, and the joined body 24 is formed into a plate shape to be surface-joined to the cam surface 23.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0013]
In FIG. 2, reference numeral 1 denotes a transport device for the load 2.
[0014]
The transport device 1 is connected to a bolt body 5 supported on a fixed member 4 so as to be rotatable around an axis 3 extending in a vertical direction and to be able to rotate backward, and is connected to the load 2 to support the load 2. The nut body 6 is screwed into the nut body 6 and is allowed to move in the axial direction of the bolt body 5 with the forward and backward rotation of the bolt body 5 so as to be able to move backward (up and down), and is supported by the fixed side member 4. An electric motor 8 and an interlocking means 10 for interlockingly connecting the bolt body 5 to an output shaft 9 of the electric motor 8 having a gear shape are provided.
[0015]
In all the drawings, the interlocking means 10 respectively move around one axis 12 parallel to the axis 3 individually, and the first and second rotations supported by the fixed side member 4 so as to be free to rotate backward. A torque limiter 15 interposed between the first and second rotating bodies 13 and 14 for interlocking the two rotating bodies 13 and 14 with each other; A drive gear 16 formed on the rotating body 13 and a driven gear 17 fixed to the bolt body 5 on the shaft center 3 and meshing with the drive gear 16 are provided.
[0016]
The first rotating body 13 includes a rotating shaft 18 supported by the fixed member 4 so as to be rotatable around the axis 12, and a connecting pin 19 positioned on the shaft 12 and connected to the rotating shaft 18. And the drive gear 16 is formed on the rotating shaft 18. The second rotator 14 is an annular resin gear, which meshes with the output shaft 9 of the electric motor 8, and the second rotator 14 is connected to the rotator main body 20 of the first rotator 13. It is externally fitted, and is supported by the rotating shaft 18 of the first rotating body 13 so as to be rotatable relative to the first rotating body 13 around the axis 12. That is, the second rotating body 14 is attached to the first rotating body 14. It is supported by the fixed side member 4 via the rotating body 13.
[0017]
In particular, in FIGS. 1 and 4, a pair of cam surfaces 23, 23 extending flat along the chord of the outer peripheral surface are formed on a part of the outer peripheral surface of the rotator main body 20 of the first rotator 13. The surface 23 is arranged at a radially symmetric position on the outer peripheral surface of the rotating body 20. A pair of plate-shaped joined bodies 24, 24 supported at both ends by the second rotator 14 so as to rotate together with the second rotator 14 around the axis 12, and joined so as to come into surface contact with the respective cam surfaces 23. Is provided.
[0018]
More specifically, each joined body 24 is a flat leaf spring in a free state, and extends in parallel with the cam surface 23, and a halfway portion of the joined body 24 in the longitudinal direction is joined to the cam surface 23. Have been. In addition, both ends of each of the joined bodies 24 are interposed via shaft members 26 so that the joined bodies 24 do not move away from the cam surface 23 in the radial direction of the first rotating body 13 via the shaft member 26. Each shaft member 26 is supported by the shaft member 14, and its axis extends parallel to the axis 12, and is detachably attached to the second rotating body 14. In the above case, the joining of the intermediate portion of each joined body 24 to each cam surface 23 may be performed in a press-contact manner, so that rattling of the torque limiter 15 during normal rotation is prevented.
[0019]
When the electric motor 8 is driven, the second rotator 14 drives the first rotator 13 via the torque limiter 15. Then, the driving gear 16 of the rotating shaft 18 of the first rotating body 13 drives the bolt body 5 to rotate around the axis 3 via the driven gear 17, and the nut body 6 screwed to the bolt body 5 The luggage 2 is moved in the axial direction and moved backward (up and down), and the luggage 2 is moved in a desired direction by the nut body 6.
[0020]
In the above configuration, if the load of the load 2 becomes excessive and the transmission torque from the second rotating body 14 to the first rotating body 13 exceeds a predetermined value, this transmission torque causes one point in FIG. As indicated by the dashed line, the joints 24 are elastically deformed and detach from the cam surfaces 23. In this case, each end of each joint 24 slides on the outer peripheral surface of the shaft member 26 in the tangential direction. However, since the outer peripheral surface of the shaft member 26 is an arc-shaped convex surface, each joint 24 The above-mentioned sliding of each end is performed smoothly. Accordingly, the joint members 24 are smoothly separated from the cam surfaces 23 by that amount.
[0021]
Then, the relative rotation of the first and second rotating bodies 13 and 14 is allowed by the above-mentioned separation, and the electric motor 8 idles with the second rotating body 14. This prevents the electric motor 8, the first rotating body 13, and the second rotating body 14 from being subjected to an unreasonable load from the load 2, and prevents these electric motors 8, the first rotating body 13, and the second rotating body 13 from being loaded. Damage to the rotating body 14 is prevented.
[0022]
Here, as described above, when the joints 24 are deformed by the transmission torque and the relative rotation of the first and second rotating bodies 13 and 14 is allowed, the deformation characteristics of the joints 24 are as follows. The thickness and width of each of the joined bodies 24, the distance between both ends supported, the material, the method of heat treatment, the position of each of the joined bodies 24 in the radial direction of the first rotating body 13, and the like can be freely set. .
[0023]
In the above case, the cam surface 23 forming the torque limiter 15 has a simpler shape than the conventional technology in which the ball fitted in the ball hole is provided, and the cam surface 23 as described above is used. The joined body 24 to be joined to the first member only needs to have a simple shape, and accordingly, the configuration of the torque limiter 15 is simplified, and the cost of the torque limiter 15 is reduced.
[0024]
Further, as described above, the cam surface 23 is a flat surface, and the joined body 24 is formed into a plate shape to be surface-joined to the cam surface 23.
[0025]
For this reason, since the cam surface 23 and the joined body 24 each have a simpler shape, the configuration of the torque limiter 15 is further simplified and the cost is further reduced.
[0026]
Although the above description is based on the illustrated example, each of the cam surface 23 and the joined body 24 may be single, or three or more may be provided. Further, when the transmission torque between the first and second rotating bodies 13 and 14 exceeds a predetermined value, the joined body 24 may be plastically deformed or may be deformed to break. Further, the cam surface 23 may be an arc-shaped convex surface or a concave surface, or may have a concave groove in the middle of a flat surface. Further, the joined body 24 may be supported by the second rotating body 14 in a cantilever manner.
[0027]
【The invention's effect】
The effects of the present invention are as follows.
[0028]
The invention according to claim 1 is a torque limiter that is interposed between first and second rotating bodies that are each rotatable about one axis, and that interlocks and connects these two rotating bodies with each other.
[0029]
A cam body is formed on a part of the outer peripheral surface of the first rotating body, and a joined body supported by the second rotating body and joined to the cam surface to interlock the first and second rotating bodies with each other, When the transmission torque between the first and second rotating bodies exceeds a predetermined value, the joined body deforms and separates from the cam surface, and the relative rotation of the first and second rotating bodies is allowed. It is to be done.
[0030]
For this reason, if the transmission torque between the first and second rotating bodies exceeds a predetermined value, the transmission torque deforms the joint body and separates from the cam surface, thereby causing the first rotation body to move. The second rotator is allowed to rotate relative to each other and idles with each other.
This prevents an excessive load from being applied to the first and second rotating bodies, and prevents the first and second rotating bodies from being damaged.
[0031]
In the above case, the cam surface forming the torque limiter has a simpler shape than the conventional technology in which the ball fitted into the ball hole is provided, and is joined to the cam surface as described above. The joined body only needs to have a simple shape, and accordingly, the structure of the torque limiter is simplified, and the cost of the torque limiter is reduced.
[0032]
According to a second aspect of the present invention, the cam surface is a flat surface, and the joined body is formed into a plate shape to be surface joined to the cam surface.
[0033]
For this reason, since the cam surface and the joined body each have a simpler shape, the structure of the torque limiter is further simplified and the cost is further reduced.
[Brief description of the drawings]
FIG. 1 is a sectional view taken along line 1-1 of FIG. 3;
FIG. 2 is an overall side sectional view of a transfer device including a torque limiter.
FIG. 3 is a partially enlarged sectional view of FIG. 2;
FIG. 4 is a sectional view taken along line 4-4 in FIG. 1;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Conveying device 4 Fixed side member 8 Electric motor 12 Axis 13 First rotator 14 Second rotator 15 Torque limiter 23 Cam surface 24 Joined body

Claims (2)

A torque limiter interposed between the first and second rotating bodies that are each rotatable about one axis, and interlockingly connecting these two rotating bodies,
A cam body is formed on a part of the outer peripheral surface of the first rotating body, and a joined body supported by the second rotating body and joined to the cam surface to interlock the first and second rotating bodies with each other, When the transmission torque between the first and second rotating bodies exceeds a predetermined value, the joined body deforms and separates from the cam surface, and the relative rotation of the first and second rotating bodies is allowed. Torque limiter to be done. The torque limiter according to claim 1, wherein the cam surface is a flat surface, and the joined body is formed in a plate shape to be surface-joined to the cam surface.

Images