JPS6217691B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a loading mechanism that allows adjustment of axial stiffness.

Conventional loading mechanisms do not have the ability to adjust the rigidity in the axial direction, and when designing and manufacturing a certain type of testing machine, the inventor needed a loading mechanism that could adjust the rigidity in the axial direction, so he conducted various research studies. As a result, they succeeded in achieving their goal with a relatively simple mechanism.

As described above, in the load mechanism, this invention utilizes screw force in the support member receiving the thrust force so that the axial rigidity can be adjusted.
This is a loading mechanism that applies a force in the opposite direction to the thrust force through an elastic body such as rubber.

Next, a first embodiment of the present invention will be described with reference to the drawings. 1 is a fixing member, which is the main body 10 of the testing machine.
The fixing member 1 is fixed to the fixing member 1 by an appropriate fixing method, such as a screw, and the fixing member 1 has a support member 2 that loads a thrust force and is configured to engage with a dovetail groove provided in the fixing member 1. The fixing member 1 and the supporting member 2 are machined with internal threads of the same pitch so that the centers of the threads are located on the same straight line. A male threaded portion 31 that screws into the female threaded portion 11 of the fixing member 1
The first moving member 3 has an engaging portion 32 that engages with the second moving member 4 and the pressing member 5 described below. A cylindrical hole 33 is machined in the center of this engaging portion 32, a keyway 34 is provided in this cylindrical hole 33, and a stepped portion 3 is provided next to the cylindrical hole 33.
5 is formed, and following this step portion 35, an engagement surface 36 is formed.
is provided. A key 6 attached to the second transfer member 4 screwed into the support member 2 is engaged in the key groove 34 so as to be slidable in the axial direction,
Rotation of the first moving member 3 is transmitted to the second moving member 4 via the key 6.
A flange 41 is provided on the left side of the second moving member in the figure, and there is a slight gap C between the flange surface 42 of the flange 41 and the step 35 of the first moving member 3.
It is structured so that it is open.

A pressurizing member 5 is engaged with the engagement surface 36 of the first moving member 3, and the pressurizing member 5 has a substantially annular shape, and the right side in the figure is an elastic body 7 such as a disc spring or the like. Forms a leaf spring and rubber catch.
The elastic body 7 described above should preferably have a shape that is convenient for being installed between the pressure member 5 and the support member 2, and should also be selected in consideration of changes in the spring constant due to pressure.

In the above mechanism, the first moving member 3 and the second
Although the engagement point with the movable member 4 is the engagement between a key groove and a key, this engagement may be a spline shaft and a groove, and the point is that it is an engagement that transmits rotation and can be displaced in the axial direction. Bye.

In the above mechanism, the first moving member 3 and the second
Since the moving members 4 are threaded in the same direction and with the same pitch, when the first moving member 3 is rotated, the rotation is transmitted to the second moving member 4 via the key 6. The bearing member 2, which undergoes the same rotation but is screwed into the second moving member 4, remains in its position and is not displaced.

When the first moving member 3 is rotated, the axial displacement corresponding to the pitch of the screw is transmitted to the pressing member 5 through the engaging surface 36 of the engaging portion 32, displacing the pressing member 5, and causing the elastic The body 7 is compressed, and a reaction force corresponding to the amount of compression of the elastic body 7 is transmitted to the support member 2.
The magnitude of the force transmitted to the support member 2 and the support rigidity change according to the rotation of the first movable member 3, so by rotating the first movable member 3, the support member 2 can be adjusted as desired. It is possible to apply a force of , and it is also possible to adjust the rigidity against external force F in the direction of the arrow. The external force F in the direction of the arrow is normally transmitted from the support member 2 to the pressing member 5 via the elastic body 7, and from the pressing member 5 to the first moving member 3. However, when the force F in the direction of the arrow is particularly large, is a gap between the collar surface 42 of the second moving member 4 and the stepped portion 35 of the first moving member 3 due to elastic deformation due to bending of the support member 2 and/or contact between the engagement surface 36 and the pressure member 5. When C becomes zero, the external force F is directly transmitted from the second moving member 4 to the first moving member 3, and any force above a certain level is not transmitted to the elastic body 7, and destruction of the elastic body 7 is avoided. Ru.

In the above embodiment, the pitch of the threads of the first and second movable members was equal, but in the second embodiment, the pitch of the threads of the second movable member was slightly smaller than that of the first movable member. In the embodiment (see FIG. 1), as the first moving member 3 rotates, the gap C between it and the second moving member 4 gradually becomes smaller, and the gap becomes zero at a certain position. If the gap is set to zero at a certain position in this way, when an external force F exceeding a certain value acts on the support member 2,
The external force F is applied to the supporting member 2, the second moving member 4, the first
The force is transmitted to the moving member of the elastic body 7, and a large force exceeding a certain level does not act on the elastic body 7, so that it can have a protective effect against breakage.

Furthermore, the gap C formed by the first moving member and the second moving member in the first embodiment (first
In a third embodiment (not shown) in which an elastic body such as a leaf spring or a disc spring rubber is interposed in the portion (see figure), this elastic body is placed between the second moving member and the supporting member. By appropriately designing the rigidity and displacement characteristics of the attached elastic body, the rigidity of the support member against external force F can be subtly changed.

In the fourth embodiment shown below, the first movable member 30 has a female thread, is screwed into a male threaded portion 101 of a fixed member 10 attached to a measuring instrument main body 100, and is engaged with a dovetail groove of the main body 100. Matching support member 2
0 and the second moving member 40 have a male thread 401. Also, the first moving member 30 and the pressure member 50
A thrust ball bearing 80 is interposed between the two members, and both members are in rolling contact with each other, and a disc spring 70 is provided as an elastic body between the pressure member 50 and the support member 20. In this embodiment, the first moving member 30 and the second moving member 40 are engaged by a pin bent into a key shape.

Also in the above load mechanism, the first moving member 30
By rotating the moving member 30, the moving member 30 moves according to the pitch of the screw, and pressure is applied to the leaf spring 70 via the thrust bearing 80 and the pressing member 50. The pressure applied to the leaf spring 70 can be adjusted by rotationally displacing the first moving member 30.
A repulsive force acts on the support member 20.

The mechanism of the present invention can easily adjust the pressure applied to the support member and the rigidity during support, and has a relatively simple and compact structure.

[Brief explanation of the drawing]

FIG. 1 is a partially longitudinal side view showing a first embodiment of the present invention, and FIG. 2 is a partially longitudinal side view showing a fourth embodiment. Explanation of symbols: 1 and 10 are fixed members, 2 and 20 are support members, 3 and 30 are first moving members, 4 and 40
5 and 50 are pressure members; 6 is a key; 7 and 70 are elastic bodies; and 80 is a rolling bearing.

Claims (1)

[Scope of Claims] 1. A first movable member screwed into a fixed member attached to the device main body, and engaged with the first movable member so as to be displaceable in the axial direction and only rotate, Moreover, the second movable member has a threaded portion in the same direction and the same pitch as the first moving member, or with a slightly smaller pitch.
a movable member, a support member screwed onto the second movable member and attached to the main body of the device so as to regulate rotational displacement; A loading mechanism, the surface of which engages with the first movable member directly or indirectly via a bearing, and the other surface of which engages with the support member via an elastic body. 2. In the device according to claim 1, the first
A loading mechanism in which an elastic body is attached to a gap formed by a moving member and a second moving member.