WO2014162512A1

WO2014162512A1 - Rack and spur gear mechanism, rack and spur gear drive mechanism and rack and drive device

Info

Publication number: WO2014162512A1
Application number: PCT/JP2013/060053
Authority: WO
Inventors: 伸之佐藤
Original assignee: パイオニア株式会社; 東北パイオニア株式会社
Priority date: 2013-04-02
Filing date: 2013-04-02
Publication date: 2014-10-09

Abstract

A combiner drive device for moving a combiner (20A) of a head-up display or the like, wherein a spur gear (1) and a composite rack (2) operate smoothly together. The composite rack (2) is composed of a linear rack (21), an external gear (22), and an internal gear (23). The shape of a side surface (2A1) of a shared tooth (2A) at the boundary of the linear rack (21) and the external gear (22) is substantially the same as the shape of the other teeth of the linear rack (21). The other side surface (2A2) has substantially the same shape as the other teeth of the external gear (22). The shape of a side surface (2B1) of a shared tooth (2B) at the boundary of the external gear (22) and the internal gear (23) is substantially the same as the shape of the other teeth of the external gear (22). The other side surface (2B2) has substantially the same shape as the other teeth of the internal gear (23).

Description

Rack spur gear mechanism, rack spur gear drive mechanism and drive device

The present invention relates to a slack spur gear mechanism, a rack spur gear drive mechanism, and a drive device.

Conventionally, a head-up display for a vehicle uses a combiner that is a reflector that projects display light on the driver's seat side. This combiner is placed on a dashboard, for example, when in use. When not in use, the combiner is generally accommodated in the dashboard, and considering the space saving in the dashboard, it is preferable that the combiner move path has a higher degree of design freedom.

JP 2006-69473 A

For example, it is conceivable to use a rack and a spur gear (pinion) as the moving path of the drive unit in order to increase the degree of freedom in designing the moving path of the combiner. However, when the driven member is moved in addition to the combiner, it is necessary to smooth the movement of the spur gear at the place where the path bends.

The problem to be solved by the present invention is to make the movement of a spur gear smooth in a rack and spur gear configuration that can be applied to a drive device for moving a driven member.

The rack spur gear mechanism according to claim 1 is a spur gear, a rack that meshes and rotates the spur gear, and the first rack portion and the second rack portion that have different curvature radii of the rotational movement track. A composite rack continuously connected to each other, and a common tooth shared by the first rack portion and the second rack portion at a boundary between the first rack portion and the second rack portion of the composite rack, The shape of both side surfaces of the common tooth is different between the side surface on the first rack portion side and the side surface on the second rack portion side.

1 is a perspective view showing a combiner driving device of a head-up display device for a vehicle provided with a rack spur gear mechanism and a rack spur gear driving mechanism according to a first embodiment of the present invention. It is a figure explaining operation | movement of the combiner drive device in 1st Example of this invention. It is a figure which shows the joint of the linear rack in the Example of this invention, an external gear, and an internal gear. It is a side view which shows the combiner drive device of the head-up display apparatus for vehicles provided with the rack spur gear drive mechanism of 2nd Example of this invention. It is a figure explaining operation | movement of the combiner drive device in 2nd Example of this invention.

Hereinafter, an embodiment of the present invention will be described. A rack spur gear mechanism according to an embodiment of the present invention includes a spur gear and a composite rack in which a first rack portion and a second rack portion are continuously connected. The first rack portion and the second rack portion are different from each other in the radius of curvature of the track when the spur gear rotates and moves on the composite rack. There is a boundary tooth shared by the first rack part and the second rack part at the boundary between the first rack part and the second rack part of the composite rack, and the shape of both side surfaces of the boundary tooth is the first rack part. The shape of the side surface on the side and the side surface on the second rack portion side are different. Accordingly, the spur gear smoothly rotates and moves at the boundary between the first rack portion and the second rack portion.

(First Embodiment) FIG. 1 is a perspective view showing a combiner driving device of a vehicle head-up display device having a rack spur gear mechanism and a rack spur gear driving mechanism according to a first embodiment of the present invention. This combiner drive device has the rack spur gear drive mechanism 10 of the first embodiment and a combiner unit 20. The rack spur gear drive mechanism 10 includes a first spur gear 1L, a second spur gear 1R, a composite rack 2, a rotating device 3 as drive means, a first guide groove 4L, and a second guide. And a groove 5L. The composite rack 2 and the first and

second guide grooves

4L and 5L are formed in the guide member 10A. The combiner unit 20 has a combiner 20A and a combiner holding member 20B.

When this combiner drive device is mounted in a dashboard of a vehicle and functions as a head-up display, the combiner 20A is moved from the state of FIG. 1 to the upper side of FIG. Move to the top of The combiner 20A is opposed to a reflection mirror (not shown) that reflects display light of a display (not shown) at that position, and reflects the display light reflected by the reflection mirror toward the eye point on the driver's seat side.

The first and second spur gears 1L and 1R are respectively arranged on both sides at the lower end of the combiner holding portion 20B, and the first spur gear 1L and the second spur gear 1R are pivotally supported by the combiner holding portion 20B. It is fixed to the end of the gear support member 11. The rotation device 3 includes a motor 31, a worm gear 32 fixed to the drive shaft of the motor 31, a reduction gear 33 meshed with the worm gear 32, a reduction gear 34 meshed with the reduction gear 33, and a reduction gear 34 meshing The reduction gear 35 and the bevel gear 36 meshed with the reduction gear 35 are provided. The first spur gear 1L is also a bevel gear, and meshes with the bevel gear 36 of the rotating device 3.

With the above configuration, the rotational driving force of the motor 31 is transmitted to the worm gear 32, the

reduction gears

33, 34, and 35, the bevel gear 36, and the first spur gear 1L, and the first spur gear 1L rotates. The rotational driving force of the first spur gear 1L is transmitted to the second spur gear 1R by the gear support member 11. Thereby, the 1st and 2nd spur gears 1L and 1R rotate coaxially. The first and second spur gears 1L and 1R have the same gear specifications except for the bevel gear.

The composite rack 2 is configured by continuously connecting a linear rack 21, an external gear 22, and an internal gear 23. The linear rack 21 is provided in a substantially vertical direction. The internal gear 23 is provided on an arc centered on the top dead center A of the first guide groove 4L. The external gear 22 is provided so as to connect the linear rack 21 and the internal gear 23.

The first guide groove 4L is formed in parallel to the composite rack 2 so as to keep a certain distance from the composite rack 2. The second guide groove 5 </ b> L is formed substantially parallel to the linear rack 21 in the linear rack 21, and slightly inclined in a direction away from the internal gear 23 from a position corresponding to the external gear 22. Has been.

The first spur gear 1L and the second spur gear 1R are each provided with a first pin 1a that protrudes outward, and the second pin 20a that protrudes outward is provided on each side of the upper portion of the combiner holding portion 20B. It has been. The first pin 1a is fitted into the first guide groove 4L, and the second pin 20a is fitted into the second guide groove 5L. Further, the first spur gear 1L is engaged with the composite rack 2. Note that the second spur gear 1R is also provided with a composite rack 2R, a first guide groove 4R, and a second guide groove 5R, which are schematically illustrated by a one-dot chain line in FIG. 1, and includes a first spur gear 1L. And a configuration similar to the configuration of the composite rack 2L, the first guide groove 4L, and the second guide groove 5L. In the following description, the first spur gear 1L side will be described as an example. However, since the configuration and operational effects on the second spur gear 1R side are the same as those of the first spur gear 1L side, the first embodiment In the following description, reference numerals L and R are omitted.

FIG. 2 is a diagram for explaining the operation of the combiner drive device in the first embodiment. The two-dot chain lines indicated by

reference numerals

4C and 5C in the figure indicate the centers of the first guide groove 4 and the second guide groove 5, respectively. Is a line. Also, the alternate long and short dash line indicated by the symbol F is the upper surface of the dashboard of the vehicle, and the left side of the figure is the driver's seat side. When the spur gear 1 is rotationally driven by the rotating device 3, the spur gear 1 moves along the composite rack 2, and the combiner unit 20 moves following the first guide groove 4 and the second guide groove 5. . That is, as shown in FIGS. 2 (A), 2 (B), 2 (C), the combiner unit 20 is raised, and the spur gear 1 is located at the boundary position between the external gear 22 and the internal gear 23. When this happens, the first pin 20 a comes to the position of the top dead center A of the first guide groove 4. As shown in FIG. 2D, when the spur gear 1 moves along the internal gear 23, the combiner unit 20 rotates around the top dead center A, and the combiner 20A is inclined toward the driver's seat. .

Thus, the first guide groove 4 engages with the first pin 1a and is formed in parallel with the composite rack 2, and the second guide groove 5 engages with the second pin 20a and the second pin 20a. From one guide groove 4. It is formed with an arbitrary distance smaller than the interval (a constant distance) between the pin 1a and the pin 20a. Therefore, when the combiner unit 20 moves, the first guide groove 4 and the first pin 1a regulate the moving track of the combiner unit 20. In addition, the second pin 20a and the second guide groove 5 regulate the angle of the combiner unit 20 with respect to the moving track. The distance between the first guide groove 4 and the second guide groove 5 is the shortest distance from an arbitrary point on the first guide groove 4 to the second guide groove 5.

FIG. 3 is a view showing a joint of the linear rack 21, the external gear 22, and the internal gear 23. As shown in FIG. A center line 4C of the first guide groove 4 indicated by a one-dot chain line in FIG. 3 (A) is a track of the first spur gear 1. As shown in the figure, the radius of curvature of the track of the spur gear 1 in the linear rack 21 is infinite, the radius of curvature of the track of the spur gear 1 in the external gear 22 is a finite positive value, and further in the internal gear 23. The radius of curvature of the track of the spur gear 1 is a finite negative value.

The teeth existing at the boundary between the linear rack 21 and the external gear 22 are shared teeth 2A. Further, the external gear 22 and the internal gear 23 have teeth at the boundary as the shared tooth 2B. Of the both side surfaces 2A1, 2A2 of the shared tooth 2A, the cross-sectional shape of the side surface 2A1 on the linear rack 21 side is the same as the cross-sectional shape of the side surface of the teeth 21a (other teeth) of the linear rack 21, The cross-sectional shape of the side surface 2A2 on the gear 22 side is the same involute curve as the teeth 22a (other teeth) of the external gear 22. Further, of the both side surfaces 2B1 and 2B2 of the common tooth 2B, the cross-sectional shape of the side surface 2B1 on the external gear 22 side is the same involute curve as the tooth 22a (other teeth) of the external gear 22, and the internal gear 23 The cross-sectional shape of the side surface 2B2 on the side is the same involute curve as the teeth 23a (other teeth) of the internal gear 23. Thereby, the spur gear 1 is obtained. When passing through these shared

teeth

2A and 2B, the meshing between the spur gear 1 and the shared

teeth

2A and 2B becomes appropriate, and the operation of the spur gear 1 and thus the movement of the combiner unit 20 is smooth.

The combiner driving device in the first embodiment has a structure in which the combiner unit 20 is accommodated substantially vertically in the dashboard, but the combiner unit 20 is accommodated substantially horizontally in the dashboard as in the second embodiment below. It can also be a structure. FIG. 4 is a side view showing a combiner drive device of a vehicle head-up display device having a rack spur gear drive mechanism of the second embodiment, and FIG. 5 is a diagram for explaining the operation of the combiner drive device in the second embodiment. . In addition, the same code | symbol is attached | subjected to the element similar to 1st Example, and a corresponding element, and detailed description is abbreviate | omitted.

In the combined rack 2X in the combiner drive device of the second embodiment, the straight rack 21X extending vertically is shorter than the straight rack 21 of the first embodiment. Further, the composite rack 2X of the second embodiment includes a linear rack 24 that extends in the horizontal direction (front-rear direction) in the dashboard, and an internal gear 25 that connects the linear rack 24 and the linear rack 21X. . The shape of the shared tooth at the boundary between the internal gear 25 and the linear rack 21X (the shape of the side surface) and the shape of the shared tooth at the boundary between the internal gear 25 and the linear rack 24 (the shape of the side surface) It is substantially the same shape as the teeth of the opposing rack.

4 and 5 is a center line of a first guide groove (not shown) similar to the first guide groove 4 with which the first pin 1a is engaged. Reference numeral 5CX denotes a center line of a second guide groove (not shown) similar to the second guide groove 5 with which the second pin 20a is engaged.

As shown in FIG. 5, when the spur gear 1 is at the end on the linear rack 24, the combiner unit 20 is in a substantially horizontal posture and is accommodated in a dashboard (not shown). When the spur gear 1 is rotationally driven by the rotating device 3, the spur gear 1 moves along the composite rack 2X (and the center line 4CX). When the spur gear 1 passes through the internal gear 25, the spur gear 1 moves up substantially vertically by the linear rack 21 </ b> X, and the spur gear 1 moves to the external gear 22. When the spur gear 1 exceeds the external gear 22, as in the first embodiment, the spur gear 1 moves along the internal gear 23, and the combiner unit 20 rotates about the top dead center A as the rotation center. The combiner 20A is inclined toward the driver's seat.

As described above, the embodiments of the present invention have been described in detail with reference to the drawings. However, the specific configuration is not limited to these embodiments, and the design can be changed without departing from the scope of the present invention. Is included in the present invention.

1L, 1R Spur Gear 1a First Pin 2L,

2R Composite Rack

21, 21X Linear Rack 22 External Gear 23 Internal Gear 23 Internal Gear 2X Composite Rack 24 Linear Rack 25 Internal Gear Rack 3 Rotating Device (Drive Unit)
4L, 4R First guide

grooves

5L, 5R Second guide grooves 10 Rack spur gear drive mechanism 20 Combiner unit 20a Second pin

Claims

A spur gear, and a rack that meshes and rotates the spur gear, the first rack portion and the second rack portion having different curvature radii of the rotational movement orbits continuously connected, and With
There is a shared tooth shared by the first rack portion and the second rack portion at the boundary between the first rack portion and the second rack portion of the composite rack, and the shapes of both side surfaces of the shared tooth are:
A rack spur gear mechanism characterized in that the side surface on the first rack portion side and the side surface on the second rack portion side have different shapes.
The side surface on the first rack portion side is substantially the same shape as the other tooth side surface of the first rack portion, and the side surface on the second rack portion side is substantially the same shape as the other tooth side surface of the second rack portion. The rack spur gear mechanism according to claim 1.
The first rack portion is a linear rack having an infinite curvature radius;
The rack spur gear mechanism according to claim 2, wherein the second rack portion is an external gear whose curvature radius is a finite positive value.
The first rack portion is an external gear whose curvature radius is a finite positive value;
3. The rack spur gear mechanism according to claim 2, wherein the second rack portion is an internal gear whose curvature radius is a finite negative value.
A rack spur gear mechanism according to any one of claims 1 to 4, and a driving means that is fixed to a driven member that pivotally supports the spur gear and that rotationally drives the spur gear,
A rack spur gear drive mechanism characterized in that the drive means and the driven member are moved along with the spur gear along the composite rack by rotationally driving the spur gear by the drive means.
A combiner drive device for driving a combiner unit of a head-up display device comprising the rack spur gear drive mechanism according to claim 5,
The driven member is the combiner unit, the spur gear is provided on both sides of the combiner unit, and a first pin protruding from the spur gear on the side of the combiner unit, and the first pin And a second pin projecting to a position spaced apart from each other by a certain distance.
A first guide groove that engages with the first pin and is formed in parallel with the composite rack, and an arbitrary one that engages with the second pin and is smaller than the predetermined distance from the first guide groove. The combiner drive device according to claim 6, further comprising a second guide groove formed at a distance from the second guide groove.
During the movement of the combiner unit, the first guide and the first pin regulate the moving track of the combiner unit, and the second pin and the second guide groove form an angle with respect to the moving track of the combiner unit. The combiner driving device according to claim 7, wherein the combiner driving device is regulated.