JPH117332A - Device for positioning rotation of dial shaft - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve assembling workability, to shorten an assembling time and to prevent the production of a defective product owing to the fall of a regulating ball by successively providing a regulating ball guide in a cylindrical shape, which is provided with a taper groove being inclined towards regulating grooves arranged on the inner surface of a cylindrical part. SOLUTION: The cylindrical part 21 having the plural regulating grooves 21a on an inner peripheral surface and the regulating ball guide 22 having the taper groove being inclined towards the regulating grooves 21a in a base 19. When a dial shaft 18 is inserted to the fitting position of the base 19 and is moreover, pushed-in, the regulating ball 23 is rolled in the taper part of the regulating ball guide 22, pressurized at a regulating spring 24 side and fitted into the cylinder part 18b of the dial shaft 18. When the dial shaft 18 is pushed-in this state, the regulating ball 23 enters into the cylinder part 18b while rolling, sufficiently enters into the cylinder part 18b when the dial shaft 18 reaches a normal position and is arranged in the position of the regulating grooves 21a of the base 19.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for switching an air outlet of a heater control device of an automobile or for adjusting a temperature in a vehicle compartment, and for setting various control conditions. The present invention relates to a dial shaft rotation positioning device for imparting a moderation function to a dial shaft that is rotated in conjunction with a dial knob so that an operator can intuitively understand an operation amount of the dial shaft.

[0002]

2. Description of the Related Art As a conventional example of such a device,
For example, there is a rotary body positioning device disclosed in Japanese Utility Model Laid-Open No. 7-13015. This device inserts a spring and a small ball into a bottomed hole provided in a protrusion fixed to the panel body,
On the other hand, a circular body having a plurality of concave grooves formed on the inner peripheral surface is fixed to a support shaft to which a dial knob is attached, and then attached to a protrusion provided on the panel body, and a small ball is pressed into the concave groove. By doing so, a moderation mechanism is configured. The circular body is provided with a small hole, and at a position where the small hole communicates with the bottomed hole provided in the panel body, the spring and the small ball are formed from the outside of the circular body through the small hole through the bottomed hole. The small ball and the concave groove are engaged by pushing it into the inside and turning the support shaft.

Further, as another conventional example, FIGS.
As shown in FIG. 2, a plurality of moderation grooves 3 are provided on the inner peripheral surface of a cylindrical portion 2 fixed to a base 1, and a dial shaft 4 which is rotated by attaching a dial knob (not shown) is provided with a bottomed hole 5 in the dial shaft 4.
The moderation spring 6 and the moderation ball 7 are inserted into the bottomed hole 5. In order to assemble the dial shaft 4 to the cylindrical portion 2, the moderation spring 6 is manually formed until the moderation ball 7 enters the moderation groove 3.
Is pressed and bent, and inserted into the moderation groove 3.

[0004]

Among the conventional rotary positioning devices for a dial shaft having the above configuration, in the former case,
The assembled small ball needs to be engaged in a state of being pressed against the concave groove portion by the urging force of the spring in order to give moderation to the pivoting operation of the support shaft. When the spring and the small ball are inserted from the hole, the small ball jumps out of the small hole due to the repulsive force of the spring. Therefore, when inserting the spring and the small ball into the bottomed hole provided in the projection fixed to the panel body and mounting the circular body, the assembling operator rotates while strongly pressing the small ball with the finger. It was necessary to attach it, and it was not easy to assemble the dial knob and the circular body, etc., it was easy for small balls to fall, it took time to assemble, and it was hard to say that the assemblability was good.

[0005] That is, it is difficult to rotate the support shaft when the amount of pushing the small ball by the assembling worker is insufficient, and in the case of mass production, the assembling worker's finger is hurt, and occupational health problems. Could occur. further,
When the dial knob is rotated without limitation, if it is rotated to the position where the small hole provided in the circular body and the bottomed hole provided in the panel body communicate with each other, the small ball and the spring jump out from the small hole. Therefore, the range in which the dial knob is rotated must be limited to a certain range, and there is a problem that the use is restricted.

In the case of the latter configuration, if the base 1 has ribs or the like and the moderation spring 6 cannot be depressed by the fingers even if the moderation spring 6 is bent, the dial shaft 4 must be assembled. Can not. Also, the moderation spring 6 and the moderation ball 7 are assembled to the dial shaft 4, and are pinched to an arbitrary position to bend the moderation groove 3.
When inserted into the device, there is a problem that the moderation ball 7 tends to drop and become a defective product.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems. In a structure in which a moderation ball is pressed against a moderation groove by the force of a moderation spring, a dial shaft has a moderation function. When assembling the shaft to the cylindrical part, the assembling operator does not need to press the moderation ball with a finger, and it is possible to assemble simply by setting the components at any position and pushing the dial shaft into the cylindrical part. To reduce the assembling time, prevent the moderation ball from dropping, prevent the occurrence of defective products due to the moderation ball dropping, improve the quality, and increase the rotatable range of the dial shaft. It is an object of the present invention to obtain a dial shaft rotation positioning device having no restrictions.

[0008]

SUMMARY OF THE INVENTION A dial shaft rotation positioning device according to the present invention has a tapered groove inclined toward a moderation groove provided on an inner surface of a cylindrical portion fixed to a base of a control device. A moderation ball guide is provided in connection with the cylindrical portion, and a moderation ball is bent by the moderation ball guide until the moderation ball inserted into the bottomed hole provided in the dial shaft enters the moderation groove, The dial shaft is assembled to a cylindrical portion.

Further, a ball holding guide for holding a moderating ball is provided at the bottomed hole portion of the dial shaft.

Further, a guide piece is connected to the cylindrical portion so as to be substantially parallel to the moderation groove of the cylindrical portion, and a moderation spring and a moderation ball are provided in a through hole provided in the dial shaft. When a rod-shaped member having an end surface in contact with the moderation spring and having a slope portion at the other end and capable of being fitted into a through hole of the dial shaft is inserted, and the dial shaft is assembled to the cylindrical portion, the moderation is reduced. The slope portion of the spring comes into contact with the cylindrical portion and moves in the direction of the moderation spring, thereby pressing the moderation spring and the moderation ball.

Further, the guide piece is provided with a groove longer than the moderation groove provided in the cylindrical portion.

[0012] Further, the dial shaft has an inner diameter dimension capable of positioning the dial shaft in a radial direction, is provided in connection with the cylindrical portion, and temporarily positions the dial shaft in the axial direction. An engaging claw provided on the inner surface with a protrusion having a height capable of overcoming by further pushing in, the dial shaft is engaged with a base and temporarily fixed, and in the temporarily fixed state, the moderation ball is provided. Is fitted into the bottomed hole in which the moderation spring is inserted, and the temporary fixing state is released by further pushing the dial shaft, so that the moderation ball is assembled to the moderation groove.

[0013] A pair of guide ribs are provided so as to be connected to the cylindrical portion in a direction parallel to the axis of the dial shaft, and are connected to the cylindrical portion at a position adjacent to a moderation groove at an intermediate portion between the pair of guide ribs. And a moderating ball guide having a sloped rib formed at an end thereof with a slope portion for moving the moderating ball in the axial direction of the dial shaft.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1 FIG. FIG. 1 is a perspective view showing Embodiment 1 of a rotary positioning device for a dial shaft according to the present invention, and FIG.
FIG. 3 is a front view of an automotive heater control device (hereinafter, referred to as H / C) 10 including a dial shaft rotation positioning device according to Embodiment 1 of the present invention, FIG. 3 is a plan view thereof, and FIG. FIG.

In the figure, 11 is a front panel of the H / C,
Numeral 12 denotes a dial knob for switching an air outlet (not shown), numeral 13 denotes a dial knob for adjusting the temperature in the cabin, numeral 14 denotes a dial switch knob for switching the air volume, and numeral 15 denotes a dial for switching between inside and outside air. A switch knob, 16 is an air conditioner switch, and 17 is an economy switch.

Reference numeral 18 denotes a dial shaft provided with the dial knob 12 and rotated, 19 denotes a base, and 20 denotes a dial shaft.
An arm rotatably held by a rotation support portion 19a of the base 19 on which the dial shaft 18 is supported;
A fan gear 20a is formed at one end. Base 19
Has a cylindrical portion 21 having a plurality of moderation grooves 21a provided on an inner peripheral surface thereof, a tapered groove inclined toward the moderation groove 21a, in addition to the rotation support portion 19a for holding the arm 20. A moderation ball guide 22 provided in a portion located below the dial knobs 12 and 13 and a cable holding portion 19b for holding a cable for opening and closing a damper of a blower (not shown) are integrally formed. .

Further, the dial shaft 18 is provided with a bevel gear portion 18a which engages with a sector gear portion 20a formed on the arm 20, and a moderate moderation is provided when operating the dial knob 12 (13, 14). The moderating ball 23 and the cylindrical portion 18b for accommodating the moderating spring 24 are provided integrally with each other. A notch 18d is formed in a flange portion 18c formed on the vehicle front side of the bevel gear portion 18a to engage with a positioning rib 19c provided upright on the base 19.

The moderation ball 23 for providing moderation and the moderation spring 24 for pressing the moderation ball 23 into the moderation groove 21a of the base 19 are formed by a cylindrical portion 18b of the dial shaft 18.
The dial knob 12 is rotated in accordance with the rotation of the dial shaft 18 to give a moderation to the operation of the dial knob 12.

When the dial knob 12 is rotated, the dial shaft 18 is rotated, and the rotational movement of the bevel gear portion 18a is transmitted to the sector gear portion 20a of the arm 20.
0 rotates around the rotation support portion 19a. The other end of the arm 20 is connected to one end of a cable 25 for opening and closing a damper of a blower (not shown). By pushing and pulling the cable 25, the damper of the blower is opened and closed to operate. The opening state of the air outlet of / C can be set. The cable 25 is held by a cable holding portion 19 b erected on the base 19.

Reference numeral 26 denotes a dial shaft which is attached to the dial knob 13 and is rotatably held by a rotation support portion 19a provided on the base 19. The dial shaft 26 has a configuration similar to that of the dial shaft 18, and includes a moderation ball 23 for providing moderation, and a moderation spring for pressing the moderation ball 23 against a moderation portion 21 a provided on the cylindrical portion 21. Is housed and arranged in the cylindrical portion of the dial shaft 26, and rotates following the rotation of the dial shaft 26, so as to give moderation to the operation of the dial knob 13.

Reference numeral 27 denotes a sector gear portion provided on the base 19 and rotatably held by a rotation support portion 19a on which the dial shaft 26 is supported. The sector gear 27
Gear teeth 27a are formed at one end, and one end of a cable 28 for opening and closing a damper of a blower (not shown) is connected to the other end. When the dial knob 13 is rotated, the dial shaft 26 is rotated, and the rotation of the bevel gear 26a is transmitted to the gear teeth 27a of the sector gear 27, and the sector gear 27 is rotated about the rotation support 19a. By rotating and pushing / pulling the cable 28, the temperature of the blower (not shown) is set by opening and closing the damper.

Reference numeral 29 denotes a switch for adjusting the air volume. Further, a lever knob 15 for switching between inside and outside air is attached to a lever 30, and the lever 30 is rotatably attached to an attachment portion 31 whose rear end is provided upright on a base 19. The lever 30 has an ear 30a, and one end of a cable 33 is movably connected to a hole 30b formed in the ear 30a. 3
The front panel 1 has one end attached to the lever 30 and the front panel 1.
This is a moderation spring that elastically engages with the moderation portion 11a formed in the first section.

Next, a procedure for assembling the moderation ball 23 into the moderation groove 21a in the above configuration will be described.

(1) First, the base 19 to which the front panel 11 is not assembled is tilted by a jig (not shown).

(2) Next, the dial shaft 18 is inserted into the mounting position of the base 19, and the temporary assembly is started. At this time, the moderating spring 24 is connected to the cylindrical portion 18b having the bottomed hole.
And the moderation ball 23 during temporary assembly
The moderation spring 24 is prevented from falling by applying grease.

(3) Further, a notch 18 formed in a flange portion 18c provided on the vehicle front side of the bevel gear portion 18a.
By engaging d with a positioning rib 19c erected on the base 19, the cylindrical portion 18b is positioned so that the moderating ball 23 can be engaged with the moderating ball guide 22.

(4) Next, the moderation ball 23 is placed on the moderation ball guide 22 (position P1 in FIG. 4), and the dial shaft 18 is further pushed in.
Rolls on the tapered portion of the moderation ball guide 22 and is pressed against the moderation spring 24, and fits into the cylindrical portion 18b of the dial shaft 18 (position P2 in FIG. 4). If the moderation ball 23 does not fit well, it is fitted by moving the dial shaft 18 back and forth.

(5) When the dial shaft 18 is further pushed in in this state, the detent ball 23 rolls and enters the cylindrical portion 18b while rolling, and when the dial shaft 18 reaches the normal position, it sufficiently enters the cylindrical portion 18b, It is arranged at the position of the 19 moderation grooves 21a (the position of P3 in FIG. 4).

(6) Finally, the dial knob 12 is fitted on the dial shaft 18 and other members are assembled, and then the front panel 11 is attached, whereby the assembly is completed.

According to the structure of the present embodiment, when the dial shaft is assembled to the cylindrical portion by the above-described assembling procedure, the assembling operator does not need to press the moderation ball with a finger, and can be placed at any position. It can be assembled simply by setting the components and pushing the dial shaft into the cylindrical part, improving the assembly workability, shortening the assembly time, preventing the moderation ball from falling, and causing the moderation ball to fail. The generation of products can be prevented, and the quality can be improved. Further, the rotatable range of the dial shaft is not restricted as in the conventional example, and the degree of freedom is large.

Embodiment 2 In the same structure as in the first embodiment, as shown in FIG. 5, a ball holding guide 35 for holding the moderating ball 23 is provided at the cylindrical portion 18b having the bottomed hole of the dial shaft 18. With this structure, when the moderating ball 23 rolls on the moderating ball guide 22 when the dial shaft 18 is assembled, the moderating ball 23 is
Is suppressed, so that a more stable assembling operation can be performed.

Embodiment 3 FIG. FIGS. 6 to 8 show still another embodiment of the present invention, in which a rotation support portion 19a, a mounting portion, and a plurality of moderation grooves 21a are formed on an inner peripheral surface similar to the first embodiment. , Cylindrical portion 21 provided with
A guide piece 32 and the like are provided so as to be connected to the cylindrical portion 21 so as to be substantially parallel to the one moderation groove 21a.

An intermediate portion of the dial shaft 18 rotatably supported by the cylindrical portion 21 fixed to the base 19 includes:
A cylindrical portion 18b having a bevel gear portion 18a and a through hole in a direction orthogonal to the axial direction is provided, and a through hole 36 penetrating through the dial shaft 18 is provided in the cylindrical portion 18b. The through hole 36 has a moderation ball 23, a moderation spring 24, an end surface at one end in contact with the moderation spring 24, and a slope portion 37 a at the other end.
6 and a rod-shaped member 37 that can be fitted thereinto are inserted.

The arm 20 has a sector gear 20a meshing with the bevel gear 18a of the dial shaft 18, and a base 1
Fitting hole 20 rotatably fitted to the rotation support portion 19a
b is provided. The cylindrical portion 2 provided on the base 19
Reference numeral 1 denotes a cylindrical shape having a plurality of moderation grooves 21a provided on an inner surface, and a dial shaft 18 is rotatably inserted and disposed in this portion. The guide piece 3 is provided on the cylindrical portion 21.
The guide piece 32 has a moderation groove 32a longer than the other.

The procedure for assembling the dial shaft 18 having the above structure to the base 19 is as follows. First, as shown in FIG. 6, after the arm 20 is rotatably assembled to the tubular portion 21 of the base 19, the dial shaft 18 is inserted into the tubular portion 21. At this time, the through-hole 36 provided in the dial shaft 18 is disposed so as to face the guide piece 32 of the tubular portion 21. And the through hole 3 of the dial shaft 18
6, a moderation ball 23, a moderation spring 24, and a rod-shaped member 3
Insert 7

When the dial shaft 18 is further inserted,
As shown in FIG. 7, the upper end slope 37 a of the rod 37 comes into contact with the cylindrical part 21, and the rod 37 is pushed down in the direction of the lower detent spring 24. As shown in FIG. 8, the dial shaft 18 is assembled to the cylindrical portion 21 of the base 19 in a state where the moderation ball 23 is pressed against the moderation groove 21 a of the guide piece 32 by the moderation spring 24. Is pressed into the moderation groove 21a. The fan gear 20a of the arm 20 and the bevel gear 18a of the dial shaft 18 are arranged so as to mesh with each other.
Next, the front panel 11 on which the design surface is formed is
9 is attached so as to cover the cylindrical portion 21, and the dial knob 12 is fixed to an end of the dial shaft 18.

When the dial knob 12 is rotated in the assembled state as described above, the dial shaft 1 is rotated.
Of the bevel gear portion 18a of the arm 20
0a, the arm 20 is rotated, and a wire (not shown) attached to the end of the arm 20 is driven.

The position of the dial shaft 18 is fixed by the engagement between the moderation ball 23 and the moderation groove 21a. However, the moderation ball 23 comes off from the moderation groove 21a by applying a predetermined force or more. At this time, moderation spring 2
4 is compressed, and the force causes the rod-shaped member 37 to move into the cylindrical portion 2.
1 is pressed against the inner surface. When the dial shaft 18 is further rotated in this state, the moderation ball 23 is
1a and the rod-shaped member 37 are engaged again with the adjacent moderation groove 21a through the coincident position. Since the bar-shaped member 37 is set wider than the moderation groove 21a, the bar-shaped member 37 does not catch on the moderation groove 21a.

When the moderation ball 23 comes off the moderation groove 21a, in the conventional structure described in Japanese Utility Model Application Laid-Open No. 7-13015, the urging force of the moderation spring 24 causes the direction perpendicular to the axial direction of the dial shaft 18. The force is applied in the direction, and there is a possibility that an unreasonable force may be applied to the support portion of the dial shaft 18. Therefore, it is necessary to lengthen the support portion of the dial shaft 18 and increase the strength of the dial shaft 18. However, in the structure of the present embodiment, since the urging force of the moderation spring 24 is not applied to the dial shaft 18, the above-mentioned problem can be solved.

According to the configuration of the third embodiment, when assembling the dial shaft 18 to the tubular portion 21, there is no need to press the moderation ball 23 by hand, and the dial shaft 18 is simply pushed into the tubular portion 21. Since no assembly work is required, anyone can perform the assembly work without failure in a short time, and the assembly workability can be greatly improved. Further, defective products due to the drop of the moderation ball 23 are less likely to occur. Embodiment 4 FIG. In the structure of the third embodiment, the groove 32a is also provided in the guide piece 32. However, the groove of the guide piece 32 is not necessarily provided, and the moderation ball 23 is rolled along the guide piece 32, and the dial shaft 18 is rotated. To the cylindrical part 21
After assembling, the moderation ball 23 may be rotated to engage the moderation ball 23 with the moderation groove 21 a of the tubular portion 21.

According to the fourth embodiment, the structure of the cylindrical portion 21 is simplified, and the processing cost can be reduced.

Embodiment 5 FIG. In the structure of the first embodiment, when assembling the moderation ball 23 to the dial shaft 18, the dial shaft 18 is set on the base 19, and the moderation ball 23 is placed on the moderation ball guide 22.
Moderation ball 23 while holding dial shaft 18 by hand
Is not matched with the cylindrical portion 18b of the dial shaft 18, the moderation ball 23 cannot be assembled to the dial shaft 18. Even if the dial shaft 18 is set on the base 19, the dial shaft 1
8 release the dial shaft 18 into the moderating ball 2
3, since it moves from the assembling position and does not stop, the moderation ball 23 may not be able to be assembled with good precision.

FIGS. 9 to 12 are devised in order to improve the above points.
The configurations of the cylindrical portion (bottomed hole) 18b, the base 19, the arm 20, the cylindrical portion 21, the moderation groove 21a, the moderation ball guide 22, the moderation ball 23, and the moderation spring 24 are described in FIGS. This is the same as that of the first embodiment.

Numeral 40 has an inner diameter slightly larger than the flange portion 18e so that the dial shaft 18 can be positioned in the radial direction, and is rotatable when the dial shaft 18 is fitted. An engagement provided with a projection 41 on the inner surface which is provided adjacent to the protrusion 21 and has a height capable of temporarily positioning the dial shaft 18 in the axial direction and having the height over which the dial shaft 18 can be overcome by being further pushed in. They are nails. Projection 41
May have a rib shape or a small protrusion shape.

To mount the dial shaft 18 on the base 19, first, the moderating spring 24 is mounted on the cylindrical portion 18b, and the dial shaft 18 is set on the base 19. At this time, the projecting portion 41 is in a slight interference state with the dial shaft 18, and the dial shaft 18 does not enter any further, and is in a temporarily fixed state. In this position, when the moderation ball 23 is placed on the moderation ball guide 22, the moderation ball 23 just enters the cylindrical portion 18b. Thereafter, when the dial shaft 18 is further pushed in, the engagement claws 40 are opened outward, the dial shaft 18 rides over the projections 41, the temporarily fixed state is released, and the dial shaft 18 is assembled to the base 19.

According to the configuration of the present embodiment, when the dial shaft 18 is set on the base 19, the moderation ball 23 is located at a position where the moderation ball 23 is assembled in that state.
Can be easily stored in the cylindrical portion 18b of the dial shaft 18, and the dial shaft 18 can be held in hand,
Since the moderation ball 23 can be assembled without being adjusted to the dial shaft 18, the workability of the assembly can be greatly improved.

Embodiment 6 FIG. In the configuration of the fifth embodiment, since the dial shaft 18 and the moderation ball 23 are assembled at the same time, the moderation ball guide 22 and the moderation ball guide 22 are taken into consideration in consideration of the insertion workability of the moderation ball 23 and the assembly workability of the dial shaft 18 at that time. The upper surface had to be an inclined surface. As a result, if no measures are taken, the thickness of the back side of the moderate ball guide 22 is increased, and sink occurs during molding. Therefore, as shown in FIG. 15, it is necessary to provide a thief, that is, a depressed portion 32b by removing the material of the portion, on the back side of the moderation ball guide 22.

However, in order to make the molded product detachable from the molding die, a molding die for molding such a stealing plate 32b can slide a part of the die in the direction of the drawing, ie, radially outward. It is necessary to have a simple structure. Therefore, the position where the moderation ball guide is provided is restricted to the vertical or horizontal position with respect to the dial shaft axis, and cannot be set at any position on the moderation guide circumference, and the degree of freedom in design is small. Has problems.

The moderation ball guide 22 has a U-shaped groove.
Since it has a three-letter original shape, the mold structure is complicated and the number of manufacturing steps is increased.

FIGS. 16 to 19 are for solving the above problems. As shown in FIG. 16, the dial knob 12, the dial shaft 18, the cylindrical portion 21, the moderation groove 21a, the moderation ball 23 and the moderation spring 24 are the same as those in the fifth embodiment shown in FIG.

A pair of guide ribs 51 connected to the inside (axial side) of the guide bottom plate 50 connected to the outside of the cylindrical portion 21 and adjacent to the moderation groove 21a between the guide ribs 51. And a rib 52 with a slope provided in connection with the cylindrical portion 21 at the position where it is to be formed. A slope 51 a for moving the moderation ball 23 in the direction of the axis of the dial shaft 18 is provided on the inner surface of the end of the guide rib 51, and a slope 5 is provided at the end of the sloped rib 52.
1a is provided, and forms a moderation ball guide that guides the moderation ball 23 as a whole.

The rotation positioning device for a dial shaft having the above-mentioned structure utilizes the moderation ball 23 having a spherical shape and employs a moderation ball guide having a guide structure composed of three ribs, thereby providing a moderation ball for moderation ball assembly. The shape of the ball guide is simplified, and a mold structure in which the product can be removed from the mold only by the sliding movement of the dial shaft 18 in the axial direction becomes possible. This simplifies the mold structure, stabilizes the product quality, and Mold manufacturing costs can be reduced.

In addition, the thickness of the moderation ball guide can be easily set, the moderation ball guide can be set at any position on the moderation circumference in accordance with the design requirements by eliminating the occurrence of sinkage during molding.
The degree of freedom in design can be expanded.

[0054]

Since the present invention is configured as described above, it has the following effects.

1) When assembling the dial shaft to the cylindrical portion, the dial shaft can be assembled simply by pushing the dial shaft into the cylindrical portion, and no skill is required for the operation, and anyone can perform an assembling operation without failure in a short time. The assembling workability can be greatly improved.

2) The occurrence of defective products due to the drop of the moderating ball can be prevented, and the yield and quality can be improved.

3) By temporarily fixing the dial shaft with the engaging claws provided on the base, the workability of assembling the moderating ball can be remarkably improved.

4) The shape of the moderation ball guide for moderation ball assembly is simplified, and a mold structure in which the product can be removed from the mold only by sliding movement in the direction of the axis of the dial shaft becomes possible. It can simplify, stabilize product quality, and reduce mold manufacturing costs.

5) The stealing is easily formed, the occurrence of sink marks is eliminated, and the moderation ball guide can be set at any position on the moderation circle according to the design requirements. Can be spread.

[Brief description of the drawings]

FIG. 1 is a perspective view of a rotary positioning device for a dial shaft according to a first embodiment of the present invention.

FIG. 2 is a front view of the heater control device including the dial shaft rotation positioning device shown in FIG.

FIG. 3 is a plan view of the same main part.

FIG. 4 is a sectional view taken along the line AA of FIG. 3;

FIG. 5 is a perspective view of a rotary positioning device for a dial shaft according to a second embodiment of the present invention.

FIG. 6 is a cross-sectional view of a main part of a heater control device including a dial shaft rotation positioning device according to a third embodiment of the present invention.

7 is a cross-sectional view of a main part showing a state in which the dial shaft in the apparatus of FIG. 6 is being assembled.

FIG. 8 is a cross-sectional view showing a state where the assembling of the dial shaft is completed.

FIG. 9 is a perspective view of a main part of a rotary positioning device for a dial shaft according to a fifth embodiment of the present invention.

FIG. 10 is a plan view of the same main part.

FIG. 11 is a perspective view showing a tubular portion and an engagement claw.

FIG. 12 is a longitudinal sectional view of a state in which the dial shaft is temporarily fixed to an engagement claw.

FIG. 13 is a perspective view showing an example of a conventional rotary positioning device for a dial shaft, showing a state before the dial shaft is assembled.

14 is a diagram showing a state after the dial shaft is assembled in the device shown in FIG. 13, (a) is a cross-sectional view,
(B) is a longitudinal sectional view.

FIG. 15 is a cross-sectional view of a main part showing a modification of the rotary positioning device for the dial shaft shown in FIG. 9;

FIG. 16 is a sectional view of a principal part showing Embodiment 6 of the rotary positioning device for a dial shaft according to the present invention.

FIG. 17 is a front view of the apparatus of FIG. 16 when the dial knob is removed and viewed from the dial knob attachment end of the dial shaft.

18 is a sectional view taken along line AA of FIG.

FIG. 19 is a sectional view taken along line BB of FIG. 17;

FIG. 20 is an enlarged perspective view of a main part of a moderation ball guide of the apparatus of FIG. 16;

[Explanation of symbols]

18, 26 dial shaft, 18b cylinder, 19
Base, 21 cylindrical portion, 21a moderation groove, 22 moderation ball guide, 23 moderation ball, 24 moderation spring, 32 guide pieces, 35 ball holding guide, 36
Through-hole, 37 rod-shaped member, 40 engaging claw, 41 protrusion, 50 guide bottom plate, 51 guide rib, 52 sloped rib.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Takahiko Ito 3-30 Shimoichimachi, Toyota City, Aichi Prefecture Inside Kojima Press Kogyo Co., Ltd.

Claims (6)

[Claims] 1. A tubular portion fixed to a base of a control device and provided with a plurality of moderation grooves on an inner peripheral surface, and a dial knob for performing a rotating operation can be attached, and a bottomed hole orthogonal to the axial direction. A moderation spring and a moderation ball inserted into a bottomed hole provided in the dial shaft; a moderation spring and a moderation ball connected to the cylindrical portion, fixed to the base, and provided in the cylindrical portion. A moderation ball guide having a tapered groove inclined toward the moderation groove, wherein the moderation ball enters the moderation groove when the dial shaft is assembled to the cylindrical portion and pivotally supported. Wherein the moderation ball guide guides the moderation spring so that the moderation spring is bent, and the dial shaft is assembled to a cylindrical portion. 2. The dial shaft rotation positioning device according to claim 1, wherein a ball holding guide for holding a moderating ball is provided at a portion of the dial shaft having a bottomed hole. 3. A cylindrical portion fixed to the base of the control device and having a plurality of detent grooves on its inner peripheral surface, and a dial knob for performing a rotation operation can be attached. A dial shaft provided, a moderation spring and a moderation ball inserted into a through hole provided in the dial shaft, and provided in connection with the cylindrical portion so as to be substantially parallel to the moderation groove of the cylindrical portion. A guide piece, and a rod-shaped member having an end surface at one end that comes into contact with the moderation spring and having a sloped portion at the other end, which can be fitted into a through-hole of the dial shaft, wherein the dial shaft is attached to the cylindrical portion. A dial, wherein when assembled and rotatably supported, a slope portion of the rod-shaped member contacts the cylindrical portion and moves in the direction of the detent spring to press the detent spring and the detent ball. Rotation positioning device Yafuto. 4. The rotary positioning device for a dial shaft according to claim 3, wherein a groove longer than the moderation groove provided on the cylindrical portion is provided on the guide piece. 5. A bottomed hole which is fixed to a base of the control device and has a cylindrical portion provided with a plurality of detent grooves on an inner peripheral surface thereof and a dial knob for performing a rotating operation can be attached. A moderation spring and a moderation ball inserted into a bottomed hole provided in the dial shaft; a moderation spring and a moderation ball connected to the cylindrical portion, fixed to the base, and provided in the cylindrical portion. A moderation ball guide having a tapered groove inclined toward the moderation groove, and having an inner diameter capable of positioning the dial shaft in a radial direction, provided in connection with the cylindrical portion,
And an engaging claw provided on the inner surface with a projection having a height that allows the dial shaft to be temporarily pushed in the axial direction and capable of overcoming by further pushing the dial shaft, and the dial shaft is provided. While temporarily engaging with the base, in the temporarily fixed state, the detent ball is fitted into the bottomed hole into which the detent spring is inserted, and the dial shaft is further pushed in to release the temporarily fixed state. And a moderation ball, wherein the moderation ball is assembled into a moderation groove. 6. A bottomed hole which is fixed to a base of a control device and has a cylindrical portion provided with a plurality of moderation grooves on an inner peripheral surface thereof, and a dial knob for performing a rotating operation can be attached. A moderation spring and a moderation ball inserted into a bottomed hole provided in the dial shaft, and a pair of guide ribs provided to be connected to the cylindrical portion in a direction parallel to the axis of the dial shaft. And a slope formed at a position adjacent to the moderation groove at an intermediate portion of the pair of guide ribs and connected to the cylindrical portion, and formed at an end with a slope portion for moving the moderation ball in the axial direction of the dial shaft. And a moderating ball guide comprising a rib.