JP3464156B2 - Spring disengagement prevention device for vehicle actuator - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for preventing a spring of a vehicle actuator from coming off. 2. Description of the Related Art As shown in FIG. 1, a conventionally known vehicle actuator has a cam gear c mounted on a shaft b in a case a and an arc centered on a shaft b protruding from the cam gear c. The hook g on one end of the spring f and the hook h on the other end of the spring f are provided between the cam d and the arc wall e concentric with the cam d protruding from the case a and located outside the cam d. And return to the center. [0003] The known device is manufactured by making the end of the arc wall e extremely close to the cam gear c in order to prevent the spring f from coming off the arc wall e. There was a problem of troublesome production. That is, when the cam d positioned inside with respect to the axis b as shown in FIG. 3 rotates as shown in FIG.
Makes strong contact with the cam gear c as shown in the enlarged view of FIG.
When the cam gear c is lifted, the cam gear c tends to come off the gap at the upper end of the arc wall e. The cause is that, when rotating from the state of FIG. 3 as shown in FIG. 4, the cam d pulls the end of the spring f with the cam d because the cam d has a small diameter. First, it comes into contact with the outer surface of the small-diameter cam d, and then makes strong contact with the contact portion A with one end of the arc wall e. Of course, the contact portion B contacts the other end of the arc wall e, but the contact portion A closer to the other end hook h makes stronger contact. Therefore, the contact portion A comes into strong contact with the cam gear c and tends to come off. In order to prevent the spring f from coming off at the contact portion A in FIG.
What is necessary is just to weaken the contact pressure in the contact part A part. Contact part A
In order to weaken the contact pressure at the portion, the positions of the cam d and the arc wall e may be reversed. That is, a large-diameter cam may be used instead of a small-diameter cam. When a large-diameter cam is used, a uniform force acts on the contact portions AB on one end and the other end as shown in FIGS. 7 and 8, so that strong contact with the cam gear can be prevented. SUMMARY OF THE INVENTION Accordingly, the present invention provides an actuator in which a shaft 2 is provided in a case 1, a cam gear 3 is mounted on the shaft 2, and a circular arc centered on the shaft 2 from the case 1. Are projected, and a cam 4 having an arc centered on the shaft 2 is projected from the cam gear 3. The arc wall 5 and the cam 4 are arranged concentrically and the cam 4 is located farther from the shaft 2. Then, a spring 6 is wound around the cam 4 and the arc wall 5,
One end and the other end of the spring 6 were bent to form one end hook 7 and the other end hook 8, respectively. The one end hook 7 and the other end hook 8 were engaged with the ends of the cam 4 and the arc wall 5, respectively. This is a device for preventing a spring of a vehicle actuator from coming off. An embodiment of the present invention will be described with reference to the drawings.
1 is a case of the actuator, 2 is a shaft provided in the case 1, and 3 is a cam gear mounted on the shaft 2. A cam 4 of an arc centered on the shaft 2 is projected from the cam gear 3 in a direction parallel to the shaft 2. . In the case 1, an arc wall 5 of an arc centered on the shaft 2 is projected so as to be concentric with the cam 4, but unlike the known example, the arc wall 5 is closer to the shaft 2 and the cam 4 Is arranged farther outside than the axis 2. [0006] A spring 6 is wound around the cam 4 and the arc wall 5. The spring 6 has one end and the other end bent to form one end side hook 7 and the other end side hook 8, respectively.
Are engaged with the ends of the cam 4 and the arc wall 5, respectively. Next, the operation will be described. When the cam gear 3 is rotated by the motor, in the case of lock, the cam 4 rotates clockwise from the state of FIG. 6 as shown in FIG. 7, and when unlocked, the cam 4 rotates counterclockwise as shown in FIG. In the case of 7, when the contact between the cam 4 and the spring 6 is viewed, the contact portion A near the other end hook 8 first contacts the contact portion A near the other end hook 8 due to the right rotation of the cam 4. Contact part B farther than the other end hook 8
Since the spring 6 following the contact portion B turns once and then becomes the one-end hook 7, it does not act to reduce the diameter of the spring 6, and the same applies to the contact portion B. Thus, when the contact states of the contact portion A and the contact portion B are compared with each other, the contact portion A is not necessarily stronger, and contacts with almost equal force. The same applies to unlocking. This will be described with reference to a known example.
Is a smaller arc, the spring f is squeezed, and the contact portion A makes stronger contact than the contact portion B. The same applies to FIG. Therefore, the spring 6 can be prevented from coming off. According to the present invention, a shaft 2 is provided in a case 1 of an actuator, a cam gear 3 is mounted on the shaft 2,
The arc wall 5 having an arc centered on the shaft 2 is protruded, and the cam 4 having an arc centered on the shaft 2 is protruded from the cam gear 3. The arc wall 5 and the cam 4 are concentric, and the cam 4 is The spring 6 is wound around the cam 4 and the arc-shaped wall 5 a plurality of times, and one end and the other end of the spring 6 are bent so that one end hook 7 and the other end One end hook 7 and the other end hook 8
6 is engaged with the ends of the cam 4 and the arc-shaped wall 5, respectively, so that the cam gear 3 is rotated by the motor. It turns as shown in FIG. 7, and when unlocked, it turns to the left as shown in FIG. 8. In the case of FIG. 7, when the contact between the cam 4 and the spring 6 is seen, When the cam 4 rotates clockwise, the contact portion A near the other end side hook 8 comes into contact with the close contact portion A first.
The contact portion B farther than the other end side hook 8 means that the contact portion B is farther than the other end side hook 8, and the spring 6 following the contact portion B turns one or more times before becoming the one end side hook 7. Therefore, the reduction in reduction as shown in FIG. 4 does not appear. Therefore, the spring 6 can be prevented from coming off.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view of a known example. FIG. 2 is an enlarged sectional view of a known example. FIG. 3 is a cross-sectional view of a known example center return. FIG. 4 is a cross-sectional view of a known example switching state. FIG. 5 is a sectional view of the present application. FIG. 6 is a sectional view of the present application returning to the center. FIG. 7 is a sectional view showing a locked state of the present application. FIG. 8 is a sectional view showing the unlocked state of the present application. [Description of Signs] 1 ... Case, 2 ... Axle, 3 ... Cam gear, 4 ... Cam, 5 ... Arc wall, 6 ... Spring, 7 ... One end hook, 8 ... Other end hook.

Claims (1)

(1) A shaft (2) is provided in a case (1) of an actuator, a cam gear (3) is mounted on the shaft (2), and an arc wall (5) of an arc centered on the shaft (2) from the case (1). And the cam 4 having an arc centered on the shaft 2 is made to protrude from the cam gear 3 so that the arc wall 5 is formed.
And the cam 4 are concentrically arranged so that the cam 4 is located farther from the shaft 2, and a spring 6 is wound around the cam 4 and the arc wall 5 a plurality of times. And the other end hook 7 and the other end hook 8
A spring release prevention device for a vehicle actuator in which one end hook 7 and the other end hook 8 are engaged with ends of the cam 4 and the arc wall 5, respectively.