JPH0719859Y2 - Dial type heater control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a dial type heater control device mounted on a vehicle, and more particularly to a heater control amount and a support mechanism of a control force transmitting portion.

[Conventional technology]

The structure of the control amount transmitting portion in the conventional dial type heater control device is, for example, as shown in FIGS.
It is as shown in the figure. In the drawing, reference numeral 1 denotes a dial, 2 denotes a shaft which is rotated integrally with the dial 1, and the shaft 2 is rotatably supported by a housing (case) 3. A bevel gear 4 is attached to the shaft 2 so as to rotate integrally with the shaft 2, and the bevel gear 4 meshes with a disc gear 5 having a bevel gear portion. A wire (not shown) is wound around, for example, the outer circumference of the disc gear 5, and the rotation control amount of the dial 1 is changed by the wire or the like through the rotation of the shaft 2, the bevel gear 4, and the disc gear 5. It is transmitted to the heater side. The disc gear 5 has a boss portion 6 standing upright from the housing 3 as a rotation fulcrum portion, and by tightening a screw 8 via a spacer 7, it is rotatably supported and fixed with respect to the housing 3 side. There is.

[Problems to be solved by the device]

However, the stop structure of the disc gear 5 as described above has the following problems.

Since the boss portion 6, the spacer 7, and the screw 8 are required, the number of parts is increased and the manufacturing cost is increased, and since the boss portion 6 is set up, the housing 3 is difficult to mold.

Further, although the torque at the time of turning the disc gear 5 can be adjusted by the tightening amount of the screw 8, the torque management is difficult because the torque changes relatively greatly by a slight change in the tightening amount. Moreover, since the screw 8 cannot be adjusted after the shaft 2 is assembled in the structure shown in the figure, it is difficult to finely adjust or readjust the torque.

Further, since the screw 8 is simply tightened, the screw 8 may be loosened due to vibration or thermal deformation of the screw 8 or the like. When the screw 8 is loosened, a predetermined operating torque is obtained. In addition to disappearing, the disk gear 5 support,
This may cause play in the transmission mechanism.

The present invention focuses on the above problems, reduces the manufacturing cost by reducing the number of parts as much as possible, makes it easy to manage the operation torque during assembly, and loosens or loosens due to vibration or thermal deformation. The purpose is to prevent the occurrence of.

[Means for Solving the Problems]

The dial type heater control device of the present invention for this purpose includes a first gear that is rotated integrally with the dial,
Dial type having a second gear that meshes with the first gear and is rotated around a fulcrum having a fixed positional relationship with the housing to transmit a control amount from the dial side to the heater side. In the heater control device, the fulcrum portion is composed of a member having a cylindrical portion that is inserted between the second gear and the center hole of the second gear from the side opposite to the housing, and the housing is provided in the cylindrical portion. A member made of the fulcrum is fixed to the housing by screwing a resin screw from the outside of the housing, and a recess is formed on the outer surface of the housing, and the screw is tightened on the resin screw when the screw is tightened. Each arm is provided with an arm that is fitted into the recess and abuts the bottom of the recess to exhibit resin elasticity.

[Action]

In such a device, the second gear is rotatably supported by the cylindrical portion of the fulcrum portion constituent member fixed to the housing by a resin screw. Therefore, the boss and the spacer that stand on the housing side are not required. Also,
A resin screw is screwed into the cylindrical part of the fulcrum component member,
With the tightening of the screw, the second gear is clamped between the fulcrum component member and the housing. In the tightened condition, the arm provided on the screw is in the recess formed on the outer surface of the housing. When fitted, the arm is pressed against the bottom surface of the recess to exert its own resin elasticity. The force due to this resin elasticity substantially becomes the clamping pressure of the second gear, and the clamping torque substantially determines the operating torque of the second gear itself. Therefore, as long as the resin elastic force by the arm is set to a predetermined force, it is not necessary to finely adjust the tightening amount (rotation amount) of the screw or the like as in the conventional case, and the torque management becomes easy. Become. Moreover, since the resin screw is inserted and screwed from the outside of the housing, readjustment or the like can be performed after the device is assembled.

Further, in the assembled state, the force due to the resin elasticity of the arm is exerted and the arm is fitted into the recess of the housing, so that the arm does not rotate in the screw rotation direction,
Therefore, the screw will not loosen due to vibration or thermal deformation.

〔Example〕

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

1 to 3 show a dial type heater control device according to an embodiment of the present invention. In the figure, 11 is a dial, 12 is a shaft that is rotated integrally with the dial 11, and 13 is a housing.
Is rotatably supported on the housing 13 side.

A bevel gear 14 as a first gear is fixed to the shaft 12 so as to rotate integrally with the shaft 12. Bevel gear 14
Is engaged with a bevel gear portion 15a of a disc gear 15 as a second gear, and the control amount (operation amount) from the dial 11 is transmitted to the disc gear 15 via the shaft 12 and the bevel gear 14. It has become so. The control amount is transmitted from the disc gear 15 to the heater side, for example, through a wire (not shown) hung on the outer periphery of the disc gear 15.

The disc gear 15 is rotatably supported around the fulcrum portion 16a, and the fulcrum portion 16a is composed of a cylindrical portion of the member 16. A shaft insertion hole 17 is formed in the fulcrum portion constituting member 16, the shaft 12 is inserted into the hole 17, and the member 16 is also supported by the shaft 12.
A projection 18 or an annular projection is provided on the surface of the member 16 facing the disc gear 15, and the projection 18 is pressed against the side surface of the disc gear 15. The cylindrical portion 16a of this member 16,
It is inserted into the center hole 19 of the disc gear 15 from the side opposite to the housing 13.

A screw is cut on the inner circumference of the cylindrical portion 16a of the member 16, and a resin screw 20 is screwed into the screw portion from the outside of the housing 13 (the lower side of FIGS. 1 and 2). The member 16 is fixed to the housing 13 by tightening the screw 20.

In this embodiment, the resin screw 20 is formed as a screw with a collar 20a, and a knob 20b is provided on the head thereof so that the knob 20b can be easily rotated by hand. On the head side of the screw 20, a pair of arms 21 is formed integrally with the screw 20, which extends outward in the radial direction and is bent in an L shape toward the housing 13. Therefore, since the arm 21 is also made of resin, it is possible to exhibit resin elasticity. On the outer surface of the housing 13, the arm 21
A recessed portion 22 having a shape that follows is formed, and when the screw 20 is tightened, the arm 21 is fitted into the recessed portion 22.

The operation of the embodiment apparatus configured as described above will be described.

FIG. 4 shows that the disc gear 15 is set at a predetermined position and the cylindrical portion 16a of the member 16 is inserted into the center hole 19 of the disc gear 15.
The state immediately before the resin screw 20 is screwed into the cylindrical portion 16a to fix the position of the disc gear 15 is shown. From this state, the screw 20 is rotated and screwed as shown by the arrow.

FIG. 5 shows a state in which the screw 20 is tightened by a predetermined amount, and the distal end of the arm 21 is fitted into the recess 22 on the outer surface of the housing 13 and is pressed against the bottom surface of the recess 22. This pressing force causes the arm 21 to bend with resin elasticity, and the force (reaction force) due to this resin elasticity acts as a force in the axial direction of the screw 20. With the screw 20 tightened, the disc gear 15
It is clamped between the housing 13 and the protrusion 18 of the member 16, and in that state, it is rotatably supported around the cylindrical portion 16a. At this time, the rotation torque of the disc gear 15 is increased. Is mainly governed by the clamping pressure. The clamping force is consequently governed by the resin elasticity due to the bending of the arm 21. Since the force due to the resin elasticity can be determined to a certain degree by design, it is possible to easily set the clamping force within a predetermined range in the tightened state of the screw 20, and the disc gear 15 controlled by the clamping force. It becomes possible to easily manage the torque of the above in a predetermined range. It is preferable that the amount of flexure of the arm 21 in the tightened state of the screw 20 in order to exert the above-mentioned resin elasticity is kept to the minimum necessary to absorb thermal deformation and the like.

When only the force of the arm 21 due to the elasticity of the resin is used, for example, a structure without a recess as shown in FIG. 6 may be considered. There is still a risk that the screws 20 will loosen. However, in the present invention, the concave portion 22 is formed on the outer surface of the housing 13, and the tip of the arm 21 is fitted into the concave portion 22 to completely prevent the screw 20 from loosening through the rotation prevention of the arm 21. Will be.

[Effect of device]

As described above, in the case of the dial heater control device of the present invention, the second gear fulcrum component member is fixed from the outside of the housing with a resin screw, and the screw is fitted into the recess on the housing side. Since the arm that exhibits resin elasticity is provided, it becomes possible to easily manage the second gear operating torque during assembly, and even if the screwing method is used, the locking of the screw is completely performed. Therefore, it is possible to realize a structure in which there is no play.

Further, compared with the conventional device shown in the drawing, at least the spacer is not required, so that the number of parts can be reduced, and since it is not necessary to form a boss on the housing side,
Its molding becomes easy.

[Brief description of drawings]

1 is a vertical sectional view of a dial type heater control device according to an embodiment of the present invention, FIG. 2 is a vertical sectional view of the device of FIG. 1 in a direction perpendicular to FIG. 1, and FIG. FIG. 4 is a bottom perspective view around the screw part of the device shown in FIG. 4, FIG. 4 is a partial longitudinal sectional view showing a state of the device of FIG. 1 immediately before tightening the screw, and FIG. FIG. 6 is a partial vertical cross-sectional view showing a state, FIG. 6 is a partial vertical cross-sectional view of the device in which the housing is not provided with a recess, FIG. 7 is a perspective view of a conventional dial type heater control device, and FIG. FIG. 9 is a sectional view taken along line VIII-VIII, and FIG. 9 is a sectional view taken along line IX-IX in FIG. 11 …… Dial 12 …… Shaft 13 …… Housing 14 …… Bevel gear as the first gear 15 …… Disk gear as the second gear 16 …… Support point component 16a …… Cylinder 17 …… Shaft Insertion hole 18 …… Protrusion 19 …… Center hole 20 …… Resin screw 21 …… Arm 22 …… Concave

Claims (1)

[Scope of utility model registration request] 1. A heater side by rotating a first gear that rotates integrally with a dial, and a first gear that meshes with the first gear and is rotated around a fulcrum having a fixed positional relationship with a housing. Second to transmit the control amount from the dial side to
In a dial type heater control device including a gear having a cylindrical portion that is inserted into the center hole of the second gear from the side opposite to the housing with the second gear interposed therebetween. A resin screw is screwed into the cylindrical portion from the outside of the housing to fix the member forming the fulcrum portion to the housing, and a recess is formed on the outer surface of the housing, and the screw is formed on the resin screw. A dial-type heater control device is provided with arms that are fitted into the recess and contact the bottom surface of the recess to exhibit resin elasticity when tightened.