JPH0587617U - Rotating structure for adjusting knob - Google Patents

Abstract

(57) [Summary] [Purpose] To improve the operability of adjustment knobs. An adjustment knob 16 rotatably supported, an adjustment block 4 having a plurality of recessed grooves 8 formed therein, and a ratchet block 10 urging a ratchet ball 13 to engage with the recessed grooves 8 are provided. One of these blocks 4 and 10 is provided so as to be rotatable in synchronism with the adjustment knob 16, and the other block 4 and 10 is provided immovably. The leaf spring 15 is pressed against the peripheral surfaces of the blocks 4 and 10 on the rotating side.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a rotating structure of an adjusting knob which can improve the operability of the adjusting knob.

[0002]

[Prior Art]

 For example, in a vehicle heating device, when selecting an outlet or adjusting the outlet temperature, the adjustment knob of a control device is generally rotated to operate. In this case, the rotation structure of the adjustment knob is, for example, As in JP-A-64-3929, a gear-shaped adjusting block is provided on the same axis as the adjusting knob, and the ratchet ball is urged in the groove of the block so that the ratchet ball can be engaged to hold the adjusting position. I was doing

[0003]

[Problems to be solved by the device]

 However, in this conventional structure, the turning resistance of the adjusting knob is obtained by the engaging force between the concave groove and the ratchet ball. There was a problem that the feel was bad and the ratchet ball vigorously engaged with the concave groove, so the impact felt by the fingers was great and the collision noise at that time was a concern.

An object of the present invention is to solve the above problems and to provide a rotating structure of an adjusting knob which has a simple structure to improve the operation feeling of the adjusting knob and to suppress the operation noise. To do.

[0005]

[Means for Solving the Problems]

 Therefore, the rotating structure of the adjusting knob of the present invention includes an adjusting knob that is rotatably supported, an adjusting block that has a plurality of concave grooves, and a ratchet that urges the ratchet ball to engage with the concave grooves. In a rotating structure of an adjusting knob in which one of these blocks is provided so as to be rotatable in synchronism with the adjusting knob and the other block is immovably provided, a block is provided on the peripheral surface of the rotating side. It is characterized by a simple structure in which the leaf springs are pressed into contact with each other to improve the operation feeling and suppress the operation noise.

[0006]

【Example】

 Hereinafter, a description will be given of an illustrated embodiment in which the present invention is applied to a vehicle heating device. In FIGS. 1 and 2, reference numeral 1 is a control device provided inside an instrument panel of a vehicle, and a supporting piece 3 is provided on a base frame 2 thereof. And the adjustment block 4 are arranged separately from each other, and the rotary shaft 5 is rotatably provided between them.

The peripheral surface of the adjusting block 4 is divided by arcuate bulging walls 6 and 7 of different diameters, and the inner surface of the large bulging wall 6 located on the upper side has a plurality of concave grooves. 8 are formed at equal intervals, and a control panel 9 displaying, for example, the blowout temperature is attached to the end faces of these overhanging walls 6 and 7.

A ratchet block 10 is fixed to a rotary shaft 5 in the adjustment block 4, and a concave hole 11 is opened in an outer end portion of the block 10. A spring 12 and a ratchet ball 13 are housed in the recessed hole 11, and the ball 13 is urged outward through the restoring force of the spring 12 so that it can be engaged with the recessed groove 8.

Further, an engagement step portion 14 is provided at a boundary portion between the overhanging walls 6 and 7 in the adjustment block 4, and a leaf spring 15 is locked on the step portions 14 and 14. The leaf spring 15 has a central portion that engages with the lower end surface of the ratchet block 10 and is assembled by slightly bending that portion downward, so that the restoring force acts on the lower end surface of the ratchet block 10.

One end of the rotary shaft 5 penetrates the control panel 9 and projects outward, and an adjusting knob 16 is fixed to the shaft end of the rotary shaft 5, and the rotary shaft 5 between the support piece 3 and the adjusting block 4 is fixed. A bevel gear 17 is fixed to the gear 17, and a gear portion 19 of a swing lever 18 meshes with the gear 17.

The swing lever 18 is rotatably supported on an upper end of a boss 20 provided on the base frame 2, and has one end of a control cable (not shown) connected to its gear portion 19 and the other end. The other end is connected to a door (not shown) in the heater unit.

In the figure, 21 is a washer, and 22 is a screw screwed from the outside of the washer 21 to the upper end of the boss 20.

[0013]

[Action]

 The rotating structure of the adjusting knob constructed as described above is a simple structure in which the leaf spring 10 is newly added to the conventional mechanism of this type, and therefore it can be easily and inexpensively manufactured. Further, when assembling the ratchet block 10, the ratchet block 10 is fixed to the rotating shaft 5 for fixing the adjusting knob 16, the spring 12 and the ratchet ball 13 are housed in the recessed holes 11 of the block 10, and the ratchet ball 13 is fixed to the spring 12. Is urged to the outside via the, and this is attached to the concave groove 8 of the adjustment block 4 so as to be engaged.

Then, a leaf spring 15 is bridged between the engaging stepped portions 14, 14 provided in the lower portion of the adjustment block 4, and the central portion of the spring 15 is engaged with the peripheral surface of the lower end portion of the ratchet block 10. It suffices to bend the relevant part slightly downward and assemble it.

In the rotating structure of the adjusting knob thus assembled, the ratchet ball 13 is urged to the outside through the spring 12, and this is engaged with one concave groove 8 of the adjusting block 4. The peripheral surface of the lower end portion of 10 is lightly pressed against the leaf spring 15.

Under such circumstances, for example, when adjusting the blowout temperature of the heater, if the adjusting knob 16 is rotated in a predetermined direction, the rotary shaft 5 to which the knob 16 is fixed rotates integrally. The ratchet block 10 fixed to the shaft 5 and the bevel gear 17 rotate integrally.

Of these, when the ratchet block 10 rotates, the ratchet ball 13 is released from the groove 8 while compressing and compressing the spring 12 by the torque, and the ball 13 is moved to the opening edge of the adjacent groove 8. When moved, it is engaged with the adjacent groove 8 by the restoring force of the spring 12.

In this case, since the peripheral surface of the lower end portion of the ratchet block 10 is lightly pressed against the leaf spring 15 as described above, the rotation resistance of the adjustment knob 16 increases by that amount, and the rotation of the adjustment knob 16 increases. The displacement is suppressed, and the ratchet block 10 that moves together is precisely displaced. Therefore, the ratchet ball 13 precisely follows the displacement of the ratchet block 10, and when the ratchet ball 13 moves to the opening edge of the concave groove 8 reliably, the ratchet ball 13 can be engaged with the concave groove 8.

Therefore, as a result that the rotation resistance of the adjustment knob is obtained only by the ratchet ball urging spring as in the conventional case, the ratchet ball 13 is not sufficiently restrained and the behavior of the ball 13 is unstable. Compared with the above, the momentum when the ratchet ball 13 is engaged with the concave groove 8 is attenuated, and the impact and the collision noise at the time of engagement are suppressed by that much. This effect is further enhanced by the fact that the leaf spring 15 simultaneously absorbs the impact and the collision sound via the ratchet block 10.

Further, the rotation resistance of the adjusting knob 16 is maintained at a predetermined value by the pressure contact of the ratchet block 10 with the leaf spring 15 even when the ratchet ball 13 is engaged with the concave groove 8. As compared with the conventional one, the fluctuation range of the turning resistance or the operating torque of the adjusting knob 16 is small as shown in FIG. 3, and a good operating feeling can be obtained.

In this way, the engagement / disengagement operation of the ratchet ball 13 and the concave groove 8 is continuously and alternately performed according to the rotation angle of the adjusting knob 16, and the ratchet ball 13 is engaged with the predetermined concave groove 8. By the way, the rotation of the adjustment knob 16 or the ratchet block 10 is stopped, and the adjustment position is held.

On the other hand, as the bevel gear 17 rotates, the rocking lever 18 meshing with the bevel gear 17 rocks, and a control cable (not shown) connected to the end of the bevel gear 17 is pulled to move the other end of the cable. Open and close the door (not shown) inside the heater unit connected to the end to adjust the amount of warm air.

In the above-described embodiment, the adjustment block 4 is fixed and the ratchet block 10 can be moved together with the rotary knob 16. However, on the contrary, the adjustment block 4 can be moved together with the rotary knob 16. You can

[0024]

[Effect of the device]

 As described above, the rotating structure of the adjusting knob of the present invention is the adjusting knob of the adjusting block having the plurality of recessed grooves and the ratchet block urging the ratchet ball to engage with the recessed groove. With a simple configuration in which a leaf spring is pressed against the peripheral surface of one of the blocks that can be rotated synchronously, the fluctuation range of the rotation resistance during the operation of the adjustment knob can be suppressed, and the operation feeling can be improved. This has the effect of suppressing the collision noise between the ratchet ball and the groove.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

2 is a cross-sectional view taken along line AA of FIG.

FIG. 3 is an operation force waveform diagram showing an operation force waveform of the present invention in comparison with a conventional example.

[Explanation of symbols]

 4 Adjustment block 8 Recessed groove 10 Ratchet block 13 Ratchet ball 15 Leaf spring 16 Adjustment knob

Claims (1)

[Scope of utility model registration request] 1. An adjustment knob rotatably supported, an adjustment block having a plurality of recessed grooves, and a ratchet block that urges a ratchet ball to engage with the recessed grooves. In the rotating structure of the adjusting knob, one of which is provided so as to be rotatable in synchronism with the adjusting knob and the other block is immovably provided, a leaf spring is pressed against the peripheral surface of the rotating block. Rotating structure of the knob.