JPS6359089B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a load cell for measuring loads with a large difference in measurement level, such as braking torque and dragging torque, when measuring dynamic dragging torque using a dynamo tester or the like. .

Generally, there is a large difference in the load measurement level between braking torque and dynamic dragging torque, so two dedicated load cells with different measurement levels are prepared and used to measure braking torque and dynamic dragging torque by replacing the load cell each time. However, not only was this method inefficient, but it was also impossible to measure drag torque during continuous braking.

To this end, load cells with built-in compact load cells for measuring small loads have been used in the past, as shown in Figure 1.However, these conventional products have a large number of parts and a complex structure, making them prone to failure and expensive. Since a portion of the load cell is fixed to the torque arm of the testing machine, the testing machine is not only limited, but also has drawbacks such as large displacement for measuring loads and difficulty in use.

The present invention has been made to eliminate these drawbacks. FIG. 1 is a cross-sectional view of the conventional product, where 1 is the torque arm of the testing machine, 2 is the main body with a hollow part for housing the small load cell 7, one end 2a of which is screwed, and 3 is the Set screw 4
The lid is fixed to the main body 2 by the main body 1.
A small load cell 7 is built into the hollow part via a push plate 5 and a spring 6, and a contact 7a of this small load cell 7 is connected to the spring 6 via a linear bearing 8 fitted to the lid 3. is pressed against a press plate 9 having a T-shaped cross section in the direction of rotation which is slidably engaged in the axial direction, and further this press plate 9
The contact 10a of the large-load load cell 10 fixed to 1 is pressed. Further, 12 and 13 are bolts and nuts screwed into the main body 2 to adjust the elastic force of the spring 6, and 14 is a lead wire for detecting the load.

A gap d is set between the push plate 9 and the lid 3, and when a small load w is applied, the gap d
A load is applied to the small load cell 7 within a range of The load of the torque arm 1 is directly applied to and detected, and the small load cell 7 built into the main body 2 is designed to prevent a load exceeding a certain level from being applied.

FIG. 2 is an explanatory cross-sectional view showing an embodiment of the load cell of the present invention, in which a cylindrical strain body has a small diameter portion 22a recessed in the circumferential direction in the center of a substrate 21 fixed to a machine stand 20. 22 and a cylindrical body 23 containing the cylindrical strain body 22 therein, each having a contact 24a in the center for abutment on the torque arm of the testing machine,
A diaphragm type strain body 24 corresponding to the opening 23a of the cylindrical body 23 is mounted on the opening 23a,
The tip 22b of the cylindrical strain body 22 and the contact 24a are made to correspond to each other through a gap d', and the strain gauges 25 and 25' are placed near the inner side of the diaphragm strain body 24. and the small diameter portion 22a
Several pieces of each are installed near the periphery of the area.

Since the load cell of the present invention is configured as described above, a small load w such as a dragging torque is detected by the diaphragm strain body 24 within the range of the gap d', and a large load w' such as a braking torque is detected. In the case of
4 will not be deformed beyond the gap d' and will be protected.

In this way, the load cell of the present invention is not only capable of continuously detecting small loads to large loads with a single unit, but also has a simple structure, so there are few failures, low cost, and it can be used with all kinds of testing machines. This provides an extremely useful load cell.

[Brief explanation of drawings]

FIG. 1 is an explanatory sectional view of a conventional load cell, and FIG. 2 is an explanatory sectional view of a load cell of the present invention. 20... Machine base, 21... Substrate, 22... Cylindrical strain body, 23... Cylindrical body, 24... Diaphragm type strain body, 25, 25'... Strain gauge, w... Small load, w'...Large load, d...Gap.

Claims (1)

[Claims] 1. A cylindrical strain body on a substrate fixed to the machine base,
A cylindrical body containing the cylindrical flexure element is provided, and a diaphragm flexure element having a contact at the center and corresponding to the opening of the cylindrical body is coated on the cylindrical body, and the cylindrical flexure element is A load cell characterized in that a tip end of the diaphragm-type strain body and the contactor are made to correspond to each other through a gap, and several strain gauges are provided near the inner side of the diaphragm-type strain body and near the periphery of the cylindrical strain-generating body. . 2. The load cell according to claim 1, wherein the center portion of the cylindrical strain body is a small diameter portion recessed in the circumferential direction, and several strain gauges are provided near the small diameter portion.