JPS5946322B2 - Rotation angle detection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rotation angle detection device that detects both minute rotation and large rotation of one drive shaft.

In the conventional structure, two types of cams are provided on the drive shaft: a cam for magnifying minute rotations and a cam for detecting large rotations, and detection of minute rotations and large rotations is performed separately from each cam at different positions. Ta.

However, this requires a large number of parts and a large shape, making the structure complex and expensive. To put one example simply, the present invention has a cam that rotates together with the drive shaft that detects the rotation angle, and a cam that rotates by an enlarged angle, which are stacked together to make the whole extremely compact and require only one force. It is an object of the present invention to provide a rotation angle detection device in which a rotation angle detection output can be obtained from a switch means integrated in one place, the number of parts is small, and wiring is simple.

Examples of the apparatus of the present invention will be described below.

In FIGS. 1 to 4 showing the first embodiment, a cam 1 serving as a first rotating body is directly connected to a drive shaft 2 and a washer 3 by 10, and a convex portion 1a on the outer periphery is for expanding the rotation angle. The convex portion 4a of the cam 4 and the cam 1 are in contact with each other so as to separate when the cam 1 rotates in the direction of the arrow. Further, a large rotation detection convex portion lb is provided on the other outer peripheral surface. The cam 4, which serves as a transmission means, is fixed to a base 5, and is rotatably coupled to a shaft 6, which is a pivot apart from the drive shaft 152, by a washer T, and a cam 4 on the top thereof is provided with a washer T to enlarge the amount of displacement due to rotation. Second to do
A lever 8 serving as a rotating body is formed in an L-shape and is stacked on top of the cam 1. A hole 208a is provided on the side of the lever 8, and a spring 9 is hooked between it and a hook 5a cut out from the base 5, so that the lever 8 is always in the upward direction in FIG. , , the rotation of the drive shaft 2 is urged in a direction. The spring force of the spring 9 is set to 25, which is weaker than that of the drive shaft restoring spring (not shown) provided on the drive shaft side, so that the drive shaft 2 does not move due to the force of the spring 9. There is. The tip of the lever 8 has a protrusion 8 for detecting slight rotation.
b30 is located on the same end surface as the outer periphery of the cam 1, and correspondingly, the fixed terminal 10 and the terminal 1 for detecting minute rotation
1. The large rotation detection terminal 12 is provided integrally with the terminal insulator 13, and the terminal insulator 13 is fixed to the base 5 with screws 3514.

FIGS. 1 and 2 show the set state. , a rotation stopper is provided on the drive shaft side so that it does not rotate in the opposite direction of the arrow than the state shown in the figure. is cut up from the base 5 and provided along the outer periphery of the cam 1.

17 is a mounting hole.

In the above configuration, when the drive shaft 2 is rotated in the direction of the arrow, since the cam 1 is directly connected to the drive shaft 2, it rotates by the same rotation angle, and the protrusion 1a provided on the outer periphery of the cam 1 rotates by the same rotation angle. The cam 4 tries to move away from the convex portion 4a, but since the cam 4 is urged by the spring 9 in the direction to follow it, it rotates at the same time.

If the radius of the cam 1 is R1 and the radius of the cam 4 is r, and R>r, the rotation angle of the force R 4 is expanded by a factor of 1 with respect to the drive shaft.

r Furthermore, assuming that the length of the arm of the lever 8 is 1, and comparing the outer circumferential movement distance of the cam 1 due to rotation with the distance R11 of the tip end movement of the lever 8, it becomes 1 × -, and the drive shaft 2 has only slightly RR displaced. The tip of the lever 8 is greatly displaced, and the contact 11a, which is integrated with the terminal 11 on the convex portion 8b of the lever tip, falls into the concave portion of the lever tip, and the enlarged circuit provided at the tip of the contact 11a falls into the concave portion of the lever tip. The contact 11b serving as the moving angle detection switch means is separated from the contact 10a of the terminal 10, and the continuity between the terminals 10 and 11 changes from 0N to 0FF, and a slight rotation is detected.

When the drive shaft 2 continues to rotate further, it hits a stopper 16 cut and raised from the base 5, and the rotation of the lever 8 is stopped. Since the lever 8 is rotated only by the biasing force of the spring 9, even if the drive shaft 2 further rotates and the convex portion 1a of the cam 1 moves, the nohum 4 will not follow the movement of the convex portion 1a and the convex portion 4a. The distance only increases and the lever 8 remains in the stopped state. This state is shown in FIG. When the drive shaft 2 continues to rotate further, the directly connected cam 1 rotates, and the large rotation detection protrusion 1b provided on its outer circumferential surface contacts the contact 12a provided integrally with the terminal 12. In order to push this outward, the contact 12b, which serves as a direct rotation angle detection switch provided at its tip, was previously separated from the contact 10a of the terminal 10, but is pressed against this, and the terminal 10, 12 The conduction between them becomes 0FF-+0N, and a large rotation of the drive shaft 5 can be detected (Fig. 4). When the drive shaft rotates in the reverse direction, the exact opposite described above is performed faithfully, and the 0
There is almost no hysteresis with respect to the Ne0FF switching rotation angle. Next, a second embodiment will be described.

In FIG. 5 and FIG. 6, this embodiment is capable of detecting two types of detection on the enlarged side: extremely small and minute, and has another type of tip protrusion 8V at the tip of the lever 8, and This is the addition of the abutting terminal 1V. Then the third
An example will be explained.

In FIGS. 7 and 8, the lever 8 is designed to rotate around a pivot 6, and has an elongated hole 8c at its rear end.
A shaft 21 of a link 20 serving as a transmission means is inserted into the elongated hole 8c. One end of the link 20 is a shaft 22
The spring 9 is rotatably supported at the other end and a spring 9 is connected to the other end. When cam 1 rotates counterclockwise as shown by the arrow,
The convex portion 1a of the cam 1 pushes the protrusion 23 of the link 20, and the link 20 rotates clockwise about the shaft 22. For this reason, the lever 8 connected by the link 20 and the shaft 21 rotates largely around the pivot 6. As described above, in the present invention, the first rotating body and the second rotating body have a laminated structure, and the switch means that is turned on and off by these rotating bodies is laminated at one location, so that rotation angle detection is possible. Since the output signal of the switch means can be taken out from one place, the wiring structure is simplified, and there is an excellent effect that the wiring can be connected using one connector, for example. Furthermore, since it is a rotating body with a laminated structure, the overall size can be made small, and it has the great effect of being able to be installed in a narrow space.

[Brief explanation of drawings]

1 and 2 are a plan view and a sectional view taken along the arrow A-A line shown in FIG. 1, respectively, showing a first embodiment of the device of the present invention, and FIGS. 5 and 6 are a partially enlarged plan view and a partially enlarged sectional view taken along the line B-B, and FIGS. 7 and 8 are respectively plan views showing the operating state. The figures are a plan view and a side view showing a third embodiment of the device of the present invention. 1...Cam serving as the first rotating body, 2...
Drive shaft, 4, 20... Cam 4 serving as a transmission means and link 20, 6... Pivot, 8... Second
Lever serving as a rotating body, 11b, 10a...Contact point serving as enlarged rotation angle detection switch means, 12b, 10a...
...Contact that serves as a direct rotation angle detection switch.

Claims (1)

[Claims] 1. A drive shaft whose rotation angle is detected; a first rotating body that rotates integrally with the drive shaft around the drive shaft; a second rotating body that rotates largely around a pivot provided at a predetermined distance from the drive shaft due to the rotation of the rotating body; and a second rotating body that abuts the first rotating body and is coupled to the second rotating body. a transmission means for transmitting the rotational force of the first rotating body to the second rotating body; and a directly coupled rotation angle detection switch means provided on top of each other that turns on and off according to the rotational displacement of the first and second rotating bodies. A rotation angle detection device comprising: enlarged rotation angle detection switch means.