JPH0247301Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a ratchet knob structure that rotates integrally when rotated in one direction, and rotates idly when rotated in the other direction.

[Problems to be solved by the prior art and the invention] In general, this type of ratchet knob is used, for example, in an electric motor, when the electric motor is in an inoperable state due to a failure of the electric motor itself or a malfunction in the electrical system. They are sometimes attached to these rotating shafts because it is necessary to manually rotate the rotating shaft (motor shaft) to take emergency measures when the situation occurs. However, conventionally, such a ratchet knob has been known, such as the one disclosed in Japanese Utility Model Publication No. 58-44393, but in this ratchet knob, a flexible stopper body is elastically moved from the inner circumferential surface of the outer cylinder. The tip of the stopper body is locked in a substantially L-shaped locking groove (corresponding to the ratchet pawl of the present invention) recessed in the rotation shaft when rotating in one direction, and Since the structure is such that it retracts when rotating in one direction, the stopper body absorbs the pressing force applied from the shaft side member when the outer cylinder rotates in one direction, and the stopper body transfers the pressing force to the opposing outer cylinder. The structure is such that the stopper body itself is susceptible to bending, which may cause the outer cylinder to spin idly even though it is rotated in one direction, or the stopper body to be damaged. It had some shortcomings and became a problem.

[Means for solving the problem] In view of the above-mentioned circumstances, the present invention was devised for the purpose of providing a ratchet knob structure that can eliminate these drawbacks. An outer cylinder that can be manually rotated by a knob is fitted and assembled to the shaft side member so as to be relatively rotatable, and a ratchet pawl is formed on the outer peripheral surface of the shaft side member. Corresponding to the pawl, when the outer cylinder rotates relative to the shaft side member in one direction, it locks on the locking surface of the ratchet pawl, and when it rotates relative to the shaft side member, it slides into contact with the inclined guide surface of the ratchet pawl and is elastic. The stopper body is characterized in that the stopper body integrally projects from the bottom of the outer cylinder toward the cylinder mouth side in order to perform a retracting operation.

With this configuration, the stopper body can receive the pressing force applied to the stopper body for a long time at the bottom of the cylinder along the direction of the pressing force, so that the stopper body can be bent. This is to ensure that the product does not get damaged or damaged.

[Example] Next, an example of the present invention will be described based on the drawings. In the drawing, reference numeral 1 denotes a motor shaft constituting an electric motor for a retractable headlight of an automobile, and a latch knob 2 according to the present invention is integrally attached to one end of the motor shaft 1. That is, the ratchet knob 2 has an outer cylinder 3 and a shaft side member 4 that is fitted into the outer cylinder 3 as described later.
The cylinder bottom 3a of the outer cylinder 3 is provided with an insertion hole 5 that coincides with the axis, and the inner surface of the cylinder bottom 3a is provided with a plurality of holes, which will be described later. A total of three stopper bodies 6 (in this embodiment, three in total) are integrally protruded toward the cylinder mouth and are scattered around the axis at predetermined intervals.

On the other hand, the shaft side member 4 is integrally attached to the motor shaft 1 by key-fitting the motor shaft 1 into a bearing hole 7 recessed at the shaft center position and preventing the motor shaft 1 from coming out using a locking pin 8. The shaft is fixed to the shaft.
A flange portion 9 is provided around the base end of the shaft side member 4, and is adapted to fit into the cylindrical mouth portion of the outer cylinder 3. When the shaft side member 4 is fitted into the outer cylinder 3, the small diameter portion 10 is configured to pass through the insertion hole 5, and a diameter larger than the insertion hole 5 is formed on the tip surface of the small diameter portion 10. The shaft can be secured to the stop plate 11 by fitting and fixing the protrusion 11a protruding from the stop plate 11 into the hole 10a formed in the small diameter portion 10 from the outside by suitable means such as heat fusion, for example, as in the embodiment. The side member 4 and the outer cylinder 3 have a bearing structure in which the flange part 9 and the small diameter part 10 are pivot supports, and are fitted and assembled in a state that allows relative rotation to each other. . There is a predetermined gap S between the inner circumferential surface of the outer cylinder 3 and the outer circumferential surface of the shaft side member 4 assembled in this way.
It is now in a loose fit state. Further, on the outer circumferential surface of the shaft side member 4, a plurality of wedge-shaped ratchet pawls 12 (six in total in this embodiment) are provided to protrude toward the gap S side.
The stopper body 6 is located at the gap S position corresponding to 2 and protrudes from the bottom 3a of the outer cylinder 3. When the outer cylinder 3 is rotated in the direction of the arrow, that is, in the rotational direction of the motor shaft 1, the locking surface 12a of the ratchet pawl 12, which protrudes in a substantially L-shape, touches one side of the stopper body 6. Notch 6a formed
By locking the outer cylinder 3, independent rotation of the outer cylinder 3 is restricted, and the shaft side member 4 and the outer cylinder 3 rotate together, thereby rotating the motor shaft 1. However, when the outer cylinder 3 is rotated in the opposite direction, the inclined guide surface 12 of the ratchet pawl 12
The stopper body 6 comes into sliding contact with b, and as a result, the flexible stopper body 6 is elastically retracted in the direction of arrow A. In this case, only the outer cylinder 3 rotates independently and the shaft side member 4 is configured so that it does not rotate and is in a so-called idling state.

In the embodiment of the present invention configured as described above, if the electric motor does not drive for some reason and the motor shaft 1 must be manually rotated as an emergency measure, the operator must rotate the outer cylinder 3. , and rotate it in the direction of arrow C (shown on the outer surface of the bottom of the outer cylinder 3). That is, when the outer cylinder 3 is pinched and rotated in the direction of arrow C, the stopper body 6
is rotated relative to the ratchet pawl 12, and as a result, the locking surface 12a of the ratchet pawl 12 engages with the notch 6a of the stopper body 6, and as a result, the shaft side member 4 rotates integrally with the outer cylinder 3, thereby allowing manual emergency rotation of the motor shaft 1. Also,
When the outer cylinder 3 is rotated in the opposite direction, the stopper body 6 comes into sliding contact with the inclined guide surface 12b of the ratchet pawl 12 and is elastically retracted in the direction of arrow A, resulting in an idle rotation state. If the electric motor is suddenly driven during such a manual operation, the outer cylinder 3 will be stopped by the retracting operation of the stopper body 6, so if the finger gripping the outer cylinder 3 suddenly Since there is no chance of getting caught in the drive, safety can be greatly improved.

In this way, in the present invention, the outer cylinder 3 and the shaft side member 4 are integrally rotated in only one direction (arrow C direction), and the motor shaft 1 can be manually rotated. When the tube 3 is rotated in the direction of arrow C,
A pressing force in the direction of arrow B is applied to the stopper body 6. However, the stopper body 6 does not protrude from the inner peripheral surface of the outer cylinder 3 as in the conventional case.
Since it is integrally provided to protrude from the cylinder bottom 3a, the pressing force is received at the cylinder bottom along this for a long time, so that the stopper body 6 is not bent due to the pressing force. , a reliable one-way rotation clutch action can be performed at all times. Furthermore, as shown in the embodiment, if the stopper body 6 is provided with a notch 6a to engage with the ratchet pawl 12, the pressing force in the direction B applied from the ratchet pawl 12 to the stopper body 6 will be applied to the notch 6a. This acts as a tensile force on the front side, which is convenient because it further prevents the stopper body 6 from being unintentionally bent.

The stopper body 6 has a structure that integrally projects from the bottom 3a of the outer cylinder 3 in the direction of the cylinder mouth, and the ratchet pawl 12 has a structure that projects from the shaft side member 4. There is no need to make the shaft side member 3 into a special shape in which a concave groove is formed as in the conventional case, and therefore the structure of both 3 and 4 can be simplified, and they can be formed as they are by simple mold processing using a mold. be able to. Moreover, in this embodiment, since a plurality of these ratchet pawls and stopper bodies are provided in the circumferential direction, the pressing force received during one-way rotation operation can be averaged around the circumference, and the pressing force can be reduced. Dispersion and smooth rotation can be measured. Furthermore, if a guide 12c is provided at the tip of the ratchet claw 12, the ratchet knob 2
Another advantage is that assembly is easier.

It goes without saying that the ratchet knob of the present invention can be attached to any member that requires it, and is not limited to a motor for a retractable headlight as in the embodiment.

[Operations and Effects] In summary, the present invention is constructed as described above, so when the outer cylinder is rotated in one direction, the stopper body is engaged with the ratchet pawl and the shaft side member is rotated together. When the clutch rotates in the opposite direction, only the outer cylinder rotates idly due to the retracting action of the stopper body that slides against the ratchet pawl. As shown in the figure, the stopper body protrudes from the bottom of the cylinder rather than from the inner circumferential surface of the outer cylinder, so that the pressing force applied to the stopper body when the outer cylinder and the shaft side member rotate together is directed along the direction of action of the pressing force. The stopper body can be supported for a long time by the bottom surface of the cylinder, and therefore, it is possible to reliably prevent the stopper body from being unintentionally bent, thereby eliminating problems such as idle rotation.

[Brief explanation of the drawing]

The drawings show an embodiment of the ratchet knob structure according to the present invention, in which Figure 1 is an overall side view of the motor shaft, Figure 2 is an exploded view showing the assembled state of the ratchet knob, and Figure 3 is an exploded view of the ratchet knob. X, Y, and Z are the plan view, partially cutaway front view, and bottom view of the shaft side member;
Y and Z are the top view, longitudinal cross-sectional view, bottom view, and fifth
The figure is a longitudinal sectional view showing the assembled state, and FIG. 6 is an explanatory diagram of the operation. In the figure, 1 is a motor shaft (rotating shaft), 2 is a ratchet knob, 3 is an outer cylinder, 4 is a shaft side member, 6 is a stopper body, and 12 is a ratchet pawl.

Claims (1)

[Scope of utility model registration request] An outer cylinder that can be manually rotated by a knob is fitted and assembled to the shaft side member on the rotation shaft side so as to be relatively rotatable, and a ratchet pawl is formed on the outer peripheral surface of the shaft side member. Corresponding to the ratchet pawl, when the outer cylinder rotates relative to the shaft side member in one direction, it locks on the locking surface of the ratchet pawl, and when it rotates relative to the shaft side member, it slides on the inclined guide surface of the ratchet pawl. The ratchet knob structure is characterized in that a stopper body integrally projects from the bottom of the outer cylinder toward the cylinder mouth side in order to perform an elastic retraction operation.