JP2000065176A - Structure of rack or gear - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate looseness of a rack and a gear and to prevent generation of an abnormal sound and vibration by arranging an elastic member so as to be positioned between a crest and a trough of a tooth possessed by the rack or the gear, and deforming the elastic member by meshing with a tooth of the other rack or a gear. SOLUTION: When a gear 30a rotates in the arrow C direction, the tooth tip surface 42a of a tooth 41a of a rack 40a tries to mesh with the almost center of a tooth 32a and a tooth 32a of the gear 30a, but since an elastic member 38a is formed between the teeth 32a, 32a in the gear 30a, the tooth tip surface 42a of the tooth 41a of the rack 40a contacts with the surface of the elastic member 38a of the almost central part of the tooth 32a and the tooth 32a of the gear 30a. When the gear 30a rotates, the tooth tip surface 42a of the tooth 41a of the rack 40a is elastically deformed so as to crush the surface of the elastic member 38a between the tooth 32a and the tooth 32a of the gear 30a. The rack 40a receives stress in the arrow D direction by torque and elastically deforming force of the gear 30a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rack or gear structure.

[0002]

2. Description of the Related Art Conventionally, various operation buttons, display devices and the like are usually arranged on an operation panel of an acoustic device or the like.
In particular, in the case of a multi-functional car stereo or the like, it is necessary to provide a tuner selection button and a display device in an operation panel of a prescribed shape, and to provide an insertion port for inserting a recording medium such as an MD (mini disc). Yes, with the improvement of functions,
There is a demand for effective use of operation panels and improvement of operability.

Therefore, a recording medium such as an MD may have a structure in which an operation panel is opened and inserted into an insertion port provided at the back of a car stereo body. For example, the operation panel is configured such that when the open / close button is operated, the bottom of the operation panel driven by the rack or gear protrudes toward the front, the top of the operation panel is lowered, and the entire operation panel is stopped in a state of being inclined. For example, an insertion slot for inserting a recording medium such as an MD can be provided inside the opened car stereo body, and the operation panel can be operated in an inclined state, so that the operation panel can be effectively used and operated. The performance can be improved.

[0004]

However, the above-mentioned operation panel uses a mechanism in which the rotation of the motor is reduced by a reduction gear and moved by meshing the rack and the gear.
In the vicinity of the stop position of the operation panel, there is a problem that abnormal noise or vibration occurs due to rattling between the rack and the gear, thereby deteriorating the quality of the product.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a rack or gear structure capable of suppressing abnormal noise and vibration due to rattling of a rack and a gear. To provide.

[0006]

In order to solve the above problems, the structure of the rack or gear according to the present invention includes a rack or gear having teeth and an elastic member provided between the peaks and valleys of the teeth. The elastic member is configured to be deformed when meshing with the teeth of another rack or gear.

[0007]

According to the rack or gear of the present invention, there is provided a rack or gear having teeth and an elastic member provided between the peaks and valleys of the teeth. Alternatively, since the gears are configured to be deformed when meshing with the gear teeth, rattling when the rack or gear meshes does not occur.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of a rack or gear according to a first embodiment of the present invention will be described below with reference to an example in which an operation panel of a car stereo or the like is opened and closed.

FIG. 1 is a schematic sectional view of the car stereo main body, showing a state in which an operation panel is opened and closed. The structure of the car stereo main body will be described with reference to the drawings.

Inside the car stereo body 10, there are provided a motor 12 for driving the operation panel 11, a small gear 13 for reducing the rotation of the motor 12, a transmission gear 14, a reduction gear 15 composed of a gear 30a and the like. , A flat rack 40a is provided. The rack 40 a is fixed to the drive plate 16, and one end of the drive plate 16 is connected to the bottom 1 of the operation panel 11.
1a and the holding pin 17 are rotatably held. A slide groove 1 is provided on the front side of the car stereo body 10.
8 is provided in the vertical direction, and the lower end of the slide groove 18 is bent toward the front side of the operation panel 11 in an L-shaped stop groove 1.
9 are provided. Also, the top section 11 of the operation panel 11
b, the slide support pin 20 is provided in the slide groove 1
8 is slidably supported.

Next, the opening and closing operation of the operation panel 11 will be described. First, as shown in FIG. 1A, when the open / close button (not shown) provided on the operation panel 11 is pressed in a state where the operation panel 11 is closed, the operation panel 11 is provided inside the car stereo body 10. The motor 12 is rotated by a CPU (not shown). The rotation of the motor 12 is reduced by a reduction gear 15 composed of a small gear 13, a transmission gear 14, a gear 30a and the like, and transmitted to the rack 40a. Motor 12
Is converted into a linear motion of the rack 40a by the gear 30a meshing with the rack 40a.

The rack 40a is fixed to the drive plate 16,
One end is provided with the bottom 11a of the operation panel 11 and the holding pin 1
When the rack 40a is driven by the gear 30a, the bottom portion 11a of the operation panel 11 cooperates with the driving plate 16 to be pushed forward (in the direction of arrow A in the figure). Is done. Also, the top section 11 of the operation panel 11
b, the slide support pin 20 is provided in the slide groove 1
8 is slidably supported with respect to the control panel 8. When the bottom 11 a of the operation panel 11 is pushed out to the front side, the slide support pins 20 of the operation panel 11 cooperate with the bottom 11 a along the slide grooves 18. It slides vertically downward (in the direction of arrow B in the figure) to lower the top portion 11b of the operation panel 11.

The CPU of the car stereo body 10 is shown in FIG.
As shown in (b), when the slide support pin 20 of the operation panel 11 reaches the L-shaped stop groove 19 of the slide groove 18, the motor 12 is stopped, and the movement of the operation panel 11 is terminated. Further, when the open / close button is pressed again, the CPU rotates the motor 12 in the reverse direction, and the gear 30a and the rack 4
The operation panel 11 is moved to the side opposite to the arrow in the drawing by the meshing mechanism 0a, and the operation panel 11 is returned to the original position.

Next, the structure of the gear 30a used in the first embodiment of the present invention will be described in detail with reference to FIGS. 2A is an enlarged view of a part of a gear main body 31a constituting the gear 30a, FIG. 2B is a cross-sectional view of the resin molded gear main body 31a, and FIG. It is a top view of the elastic member which performs. As shown in FIG. 2A, the gear body 31a has a plurality of teeth 32a formed at an outer peripheral edge and at positions facing each other. Gear body 31a
Tooth 32a forms a peak with two tooth surfaces 33a and a tooth tip surface 34a, and forms a valley with two tooth surfaces 33a and a tooth bottom surface 35a. The tooth 32a is formed with, for example, a concave groove 37a substantially at the center of the tooth width 36, and the depth of the groove 37a is formed substantially to the tooth bottom surface 35a of the tooth 32a.

On the other hand, the elastic member 38 constituting the gear 30a
As shown in FIG. 2 (c), a is formed of a stretchable annular member such as rubber, for example, and the inner diameter of the elastic member 38a has a radius R of a root circle (a circle forming the root 35a). The thickness (A) is formed to be thinner than the tip surface 34a of the tooth 32a. Also, the width of the elastic member 38a (in the direction of the paper)
Is substantially equal to the width of the groove 37a of the gear body 31a. Therefore, the gear 30a is provided with the groove 37a of the gear body 31a.
An annular elastic member 38a is mounted around the tooth 32a, and as shown in FIG.
As a result, a gear 30a protruding beyond a is obtained.

FIG. 4 is a plan view showing a state in which the gear 30a used in the first embodiment of the present invention and the rack 40a are engaged with each other. FIG. 4B shows the teeth 32a of the gear 30a and the teeth 41a of the rack 40a. FIG. First, gear 3
When 0a rotates in the direction indicated by arrow C in the figure, the rack 40
a tooth tip surface 42a of the tooth 41a of the
And the gear 32a engage with the substantially center of the teeth 32a.
Since the elastic member 38a is formed between the teeth 32a between the teeth 32a, the tooth tip surface 4a of the teeth 41a of the rack 40a
2a comes into contact with the surface of the elastic member 38a substantially at the center between the teeth 32a of the gear 30a.

Further, when the gear 30a rotates, the rack 4
The tooth tip surface 42a of the tooth 41a of the gear 0a is
The elastic member 38a meshes with the elastic member 38a between the teeth 32a and the teeth 32a, and is elastically deformed so as to crush the surface of the elastic member 38a. The rack 40a receives stress in the direction of arrow D in the figure due to the rotational force of the gear 30a and this elastic deformation force. As shown in FIG. 4B, the elastic member 38a constituting the gear 30a covers the teeth 41a of the rack 40a from the tooth apex surface 42a to the tooth surface 43a, and the teeth 32a of the gear 30a and the rack 40a.
a is interlocked between the teeth 41a.

The gear 30a further rotates, and the rack 4
When 0a further moves in the direction of arrow D, the tip surface 42a of the tooth 41a of the rack 40a gradually moves away from the surface of the elastic member 38a. The elastic member 38a is connected to the rack 40
When the tip surface 42a of the tooth 41a is separated, the tooth 41a is released from elastic deformation and is restored to the original flat state. As described above, according to the engagement mechanism of the gear 30a and the rack 40a according to the present invention, the teeth 32a of the gear 30a and the rack 40a
When the teeth 41a of the rack 40a mesh with each other, the teeth 41a of the rack 40a mesh with the elastic member 38a constituting the gear 30a.
Even if there is some gap between the gear 30a and the rack 40a, abnormal noise and vibration due to rattling or the like are suppressed.

Next, a second embodiment different from the gear 30a will be described with reference to FIGS. FIG. 5 is a sectional view of a gear 30b according to the second embodiment. The gear body 31b shown in FIG. 5 has a plurality of teeth 32b
And the remaining portion does not form the teeth 32b, but is constituted by a disk-shaped convex portion B concentric with the gear body 31b.
The radius of the disc-shaped protrusion B is formed to be R. Therefore,
By mounting the annular elastic member 38a shown in FIG. 2C on a disk, a gear 30b having one side surface formed of the elastic member 38a is obtained.

FIG. 6 shows a third embodiment. FIG. 6A shows a pair of resin-molded gear bodies 31c.
7B is a cross-sectional view of the gear 30c when the disk-shaped elastic member 38b shown in FIG. The two gear bodies 31c shown in FIG. 6A have a plurality of teeth 32c on the outer peripheral edge.
Are formed and fitted so that the center holes of the two gear bodies 31c coincide with each other.

On the other hand, the inner diameter R1 of the elastic member 38b is equal to the diameter of the cylinder 3 formed by fitting the two gear bodies 31c.
9 and the outer diameter R2 is the gear body 31b.
Is smaller than the distance from the center to the tip surface 34c. Therefore, the gear 30c is formed by sandwiching the disc-shaped elastic member 38c between the pair of gear bodies 31c, and, as in FIG.
Thus, the gear 30c protruding from the elastic member 38c is obtained.

FIG. 7 shows a gear 30 according to a fourth embodiment.
It is sectional drawing of d. The gear main body 31d shown in FIG. 7 has a structure in which teeth 32d are formed in a part of the tooth width 36, and a convex cylinder 39 is provided concentrically with the center hole of the gear main body 31d. The outer dimensions of the convex cylinder 39 of the gear body 31d are as shown in FIG.
The elastic member 38b shown in FIG.
Therefore, by attaching the elastic member 38b to the convex cylinder 39, the gear 3 whose one side surface is formed by the elastic member 38b is provided.
0d is obtained.

As described above, since the outer diameter R2 of the elastic member 38b is smaller than the distance from the center of the gear body 31d to the tooth tip surface 34c, the elastic member 38b is mounted on the gear body 31d. Figure 2
As in (a), the tip surface 34d of the tooth 32d is
A gear 30d protruding beyond 8b is obtained.

As described above, any of the gears composed of the elastic member of the above embodiment and the gear bodies of various structures have the elastic member positioned between the peaks and valleys of the gear teeth, that is, other gears. When the teeth of the gear mesh with each other, the surface of the elastic member with which the other teeth come into contact is provided so as to be located between the peaks and valleys of the gear teeth. As described with reference to FIG. Even if there is some gap between the gear 30a and the rack 40a, abnormal noise and vibration due to rattling or the like are suppressed. The concave groove 37 provided in the gear body 31 may be V-shaped or U-shaped, and is not limited to the shape.

Next, the structure of a rack according to a fifth embodiment of the present invention will be described with reference to FIG. The fifth embodiment differs from the other embodiments described above in that an elastic member is provided on the rack side. FIG. 8A shows the rack 40.
FIG. 8B is a cross-sectional view of FIG. 8B, and FIG. 8B is a partial plan view of the rack 40b. FIG. 8C is a plan view when the rack 40b and the gear 31e are engaged.

In the rack 40b, a concave groove 46 is formed substantially at the center of the tooth width 45 of the tooth 41b to a depth corresponding to the tooth bottom surface 44b of the tooth 41b. The rack 40
The elastic member 47 forming b is formed in a plate shape, the thickness is smaller than the height of the tooth tip surface 42b of the rack 40b, and the width is formed to be the width of the substantially concave groove 46. The rack 40b is
By fitting the plate-like elastic member 47 into the groove 46, the tooth tip surface 42b of the rack 40b is formed in a state protruding from the elastic member 46.

The gear 31e used in the rack or gear of the fifth embodiment is formed so as not to use the elastic member 38. As described above, in the structure of the rack or gear according to the first to fourth embodiments, the elastic member is configured on the gear side, and in the fifth embodiment, the elastic member is configured on the rack side. . That is, the process of the elastic deformation of the elastic member when the gear and the rack mesh with each other is substantially the first to the first.
Since the operation is the same as that of the fourth embodiment, the description of the operation of the fifth embodiment in which the rack 40b or the gear 31e meshes will be omitted.

Next, FIG. 9 shows the structure of a rack 40c according to the sixth embodiment, in which one side not forming the teeth 41c is formed flat to the depth of the tooth bottom surface 44c.
An elastic member 47 is mounted on the flat part. In the rack 40c of the sixth embodiment, the fifth
The same effect as that of the rack 40b according to the embodiment can be obtained.

In the above-described rack or gear, the gear or rack has been described as being formed of an elastic member having a flat surface, but as shown in FIG.
e, the teeth 32 and an elastic member 48 in which a recess is formed substantially at the center of the teeth 32 in advance, or the teeth 42 of the rack 40d and a recess are formed at the center of the teeth 42 in advance as shown in FIG. May be formed by the elastic member 49 formed with. By doing so, when the gear 30 and the rack 40 mesh with each other,
Stress due to elastic deformation is reduced.

[0030]

As described above, the rack or gear structure of the present invention includes a rack or gear having teeth and an elastic member provided between the peaks and valleys of the teeth. Since the elastic member is configured to be deformed when meshing with the teeth of another rack or gear, the elastic member between the teeth of the gear and the teeth of the rack is elastically deformed so as to be crushed. And the rattle of the rack is gone,
It is possible to suppress generation of abnormal noise and vibration between the gear and the rack.

[Brief description of the drawings]

FIG. 1 is a sectional view of a car stereo body using a rack or gear of the present invention.

FIG. 2 is a structural view of a gear main body used in the present invention and a plan view of an elastic member.

FIG. 3 is a structural diagram of a gear used in the first embodiment of the present invention.

FIG. 4 is an explanatory view of the operation of the rack or gear according to the first embodiment of the present invention.

FIG. 5 is a sectional view of a gear used in a second embodiment of the present invention.

FIG. 6 is a sectional view of a gear used in a third embodiment of the present invention and a plan view of an elastic member.

FIG. 7 is a sectional view of a gear used in a fourth embodiment of the present invention.

FIG. 8 is an explanatory diagram of an operation of a rack or gear according to a fifth embodiment of the present invention.

FIG. 9 is a sectional view of a rack according to a sixth embodiment of the present invention.

FIG. 10 is a plan view of a gear and a rack according to another embodiment of the present invention.

[Explanation of symbols]

30a, 30b, 30c, 30d, 30e. Gears 31a, 31b, 31c, 31d. Gear body 32a, 32b, 32c, 32d, 41a, 41b, 4
1c tooth 33a, 43a tooth surface 34a, 34b, 34c, 34d, 42a, 42b
Tooth surface 35a, 44a, 44b, 44c Bottom surface 36, 35 Width 37a37b, 37c, 46 Groove 38a38b, 47, 48, 49 Elastic member 39 Cylindrical 40 Rack

Claims (1)

[Claims] 1. A rack or gear having teeth and an elastic member provided between the peaks and valleys of the teeth, wherein the elastic member is connected to teeth of another rack or gear. A rack or gear structure characterized by being deformed upon engagement.