JPS6250273A - Steering wheel - Google Patents

Abstract

PURPOSE:To suppress the gap between gears due to the backlash, finishing error, and assembly error by installing a pair of planetary gears by a pin so as to be urged in the separation direction and installing an elastic member onto the outer periphery of the pin. CONSTITUTION:The gear shafts 27a and 29a of the column-side and pad-side planetary gears 27 and 29 meshed with sun gears 8 and 11 are rotatably installed onto a pair of plain bearings 32a. A certain gap is generated between the upper and lower part bearing plates 25 and 26 and the outer edge surfaces of the planetary gears 27 and 29. Two parallel pins 30 are inserted in slidable ways into the recessed parts 27b and 29b of the column-side planetary gear 27 and the pad-side planetary gear 29, and a spring 28 urging in the separation direction is fitted between the planetary gears 27 and 29. Therefore, the generation of chattering and noise in the gap is prevented by the planetary gears 27 and 29.

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention (Field of Industrial Application) The present invention relates to a steering wheel equipped with a planetary gear mechanism for making a pan 1 portion immobile.

(Prior Art) A conventional non-recessed pad type steering wheel generally has a structure as shown in FIG.

That is, a boss 59 is fixed to the tip of the steering shaft 58 passing through the column 57, and a boss plate 61 extending horizontally outward is attached to the outer periphery of the central portion of the boss 59.
is fixed by welding.

A column side sun gear 53b is on the lower outer periphery of the boss 59, and a pad side sun gear 53a is on the upper outer periphery of the boss 59.
are installed respectively, and a substantially box-shaped pad portion 51 is fixed on top of the sun gear 53a.

Two planetary gear shirts 1-54 and 64 are provided on the outer periphery of the boss plate 61 via slide bearings 63 and 73,
On that planetary shirt 1-54.6/I, pad sun gear 5
Pad-side planetary floats 55a, 65a meshing with 3a and column-side planetary gears 55b, 65b are pivotally connected, and these gears 8 and 8 are provided at opposing positions with the steering shaft 58 as the center.

However, in the steering wheel with this structure, the sun gears 53a, 53b and the planetary gear 55a.

55b, 65'a, and 65b, and gaps are created due to dimensional errors, assembly errors, etc.

Since this spacing or gap causes rattling of the pad section and generation of abnormal noise, the elastic section H is used to connect the two sliding bearings G3. Push each '73 towards the center of Hoth 59 and 1
By rotating the planetary gear 55a.

55b, 65a, and 65b are sun gears 53a and 5, respectively.
A steering wheel has been proposed in which the tooth surfaces of the wheels 3b are pressed so that they engage with each other, and the steering wheel is equipped with a function of suppressing scraping.

(Problems to be Solved by the Invention) However, although this steering wheel can suppress the crash and eliminate abnormal noise during steering operation, the following problems can be considered.

That is, if large components such as the planetary shafts 54 and 64 of the planetary gear mechanism are provided at two locations within the pad section 51 having a limited space, the pad section 51
The amount of space that can be effectively used within the vehicle body decreases, and the degree of freedom to incorporate other components, such as components that connect relay components for signal transmission between the pad portion 51 and the vehicle body, decreases. .

In addition, each planetary shaft 54. Since the '64 is individually attached to the boss plate 61 via the bearings 63 and 73, the assembly work becomes troublesome.

Structure of the Invention (Means for Solving the Problems) Therefore, in order to solve the above problems, the present invention forms the sun gear and the planetary gears with helical gears, and the pad side planetary gear meshes with the pad side sun gear. The gear and the column side i1 leg gear that mesh with the column side sun gear are attached by at least two pins attached at positions offset from the respective centers, and the gears are attached between each planetary gear in opposite directions on the axis of each other. At least one stationary side planetary gear that meshes with the sun gear is provided in a portion close to the planetary gear, and the planetary gear of the column side and the pad example and the stationary side planetary gear are inserted. A method is adopted in which the bearing unit is mounted inside the bearing unit and attached to the boss plate.

(Function) Of at least two sets of planetary gears in which a sun gear and a planetary gear are each formed of helical gears and are incorporated into one bearing unit, the pan F side 'M star gear of the negative set of planetary gears Since an elastic member is provided between the column-side planetary gear and the column-side planetary gear to move in opposite directions, the pad-side planetary gear and the column-side planetary gear mesh with each other while being pressed against each sun gear. Scratching between gears is suppressed.

In addition, since the planetary gear is incorporated into one bearing unit, it is easy to install the unit by simply attaching it to the boss plate.
'L, and the space within the planetary gear mechanism can be used effectively.

Furthermore, since the pad-side planetary gear and the column-side planetary gear are attached only by two parallel pins formed separately, assembly is easy.

Since there is only one fixed planetary gear,
The number of components of the bearing unit itself is reduced.

(Example) Next, an example embodying the present invention will be described with reference to FIGS. 1 to 3.

As shown in Fig. 2, a steering shaft 2 passes through the column 1, and a boss 3 is attached to a nut 4 at the tip of the steering shaft 2.
It is tightened and fixed. A boss plate 5 extending horizontally outward is fixed to the central portion of the boss 3 by welding.

A spoke 6 is fixed to the outer edge of the boss plate 5, and a ring 7 is supported at the tip of the spoke 6. A column side sun gear 8 made of a helical gear made of synthetic resin is provided on the outer periphery of the boss 3 on the column 1 side so as to be rotatable relative to the column 1 via a bearing 9. It has been fixed to prevent it from happening.

Similarly, a pad-side sun gear 11 made of a synthetic resin helical gear is provided on the upper outer periphery of the boss 3 via a bearing 12, and a substantially box-shaped pad portion 13 of the sun gear 11 is provided.
is fixed with bolts 14, and electronic devices such as switches and meters can be stored therein.

One bearing unit 22 is attached to one notch 21 provided on the outer periphery of the boss plate 5. As shown in FIG. 1, this bearing unit 22 is fixed to two side plates 23, a support member 24 provided approximately at the center of the outer surface of the side plates 23, and a lower end surface of the side plates 23. It is composed of an upper bearing plate 25 and a lower bearing plate 26.

The upper bearing plate 25 and the lower bearing plate 26 are recessed with two pairs of downwardly facing flat bearings 32a and 32b.

In FIG. 1, a set of sliding bearings 32a on the left side has each of the sun gears 8. The gear shafts 27a, 29a of the column-side and pad-side planetary gears 27, 29 that engage with the column side and pad side are respectively rotatably attached, and the two-part and lower bearing plates 25, 26 and each planetary gear 27 A certain gap is provided between the outer end surface of .29.

Note that the planetary gears 27 and 29 are also formed of helical gears.

Further, as shown in FIG. 3, the column side planetary gear 27
On the opposing inner surfaces of the pad-side planetary gear 29, there are two recesses 27b at positions offset from their rotation centers.
29b are provided respectively, and the recesses 27b, 29b
Two parallel pins 30 are slidably inserted inside. Note that each of the parallel pins 30 corresponds to each planetary gear 27.2!
1 is fitted on one side, and only the other side is movable.

A spring 28 is installed between the column-side planetary gear 27 and the pad-side planetary gear 29 as an upward biasing member that urges the column-side and pad-side planetary gears 27 and 29 away from each other. .

Therefore, both the reverse star gears 27.
29 are urged away from each other and rotated simultaneously and similarly by the parallel pin 30.

Further, in the upper bearing plate 25, a metal E-ring 33 is fitted into the gear shaft 29b of the pad-side planetary gear 29, and the pad gear 1 and the column-side planetary gear 29 are fitted with a metal E-ring 33.
．． 27 in the vertical direction relative movement distance is regulated.
This is designed to prevent wobbling motion in the direction of rotation of the steering wheel.

In FIG. 1, a set of sliding bearings 32b on the right side has a gear shaft 3 of one fixed side planetary gear 31 that meshes with both gears of the column side and the sun gear 8.11 of the pad example at the same time.
1a is rotatably attached. This is to prevent the pad side sun gear 11 from rotating due to the force of the spring 28 (the force that urges the pad side sun gear 29. This is because the pad side sun gear 11 is also a pad side planetary gear. 29 are both composed of helical gears, so a component of the biasing force tends to rotate the pad side sun gear 11.If the outer end surfaces of each planetary gear 27 and 29 are connected to the upper and lower bearing plates, If the pad side sun gear 11 rotates until it comes into contact with 25 and 26 and escapes, the meshing between the two planetary gears 27 and 29 and the two sun gears 8 and 11 becomes loose, making it impossible to suppress backlash. Therefore, it is necessary to prevent the pad side sun tooth IE11 from rotating when the steering wheel 28 is in operation.

To assemble the planetary gear mechanism with the above structure, the bearing unit 22 is assembled in advance, and then the boss plate 5
Fit it into the notch 21 of. Then, the support member 24 is suspended and fixed on the boss plate 5 (not shown).

In order to assemble the bearing unit 22, the column-side planetary gear 27 and the planetary gear 29 of the pad example are attached using the spring 28 and the two parallel pins 30, and both the inverted planetary gears 27 and 29 are compressed. Plain bearing 25.26
It is sufficient to mount the other planetary gear 31 in the bearing part 32b between them, and to mount the other planetary gear 31 in the other bearing part 32b.

Next, the operation of the steering wheel configured as above will be explained together with the effects.

First, when the ring 7 is rotated to perform a steering operation, the boss plate 5 and the bearing unit 22 are rotated, and as the bearing unit 22 is rotated, the two planetary gears 27° 29 on the column side and the pad side are rotated. and one planetary gear 31
and revolve around the sun gears 8 and 11 on the pad side and column side, respectively, while rotating.

However, since the column-side sun gear 8 is fixed to the column portion 7, it does not rotate, and the pad-side sun gear 29 also does not rotate following the gear 8. Therefore, pad side sun gear 1
1 is always in a non-rotating state with respect to the column 1, and the parallax 1 portion 13 fixed to the sun gear 11 is also in a non-rotating state.

Further, due to the action of the spring 28, the lower surface of the pad-side sun gear 11 constantly contacts the upper surface of the pad-side planetary gear 29, and the upper surface of the column-side sun gear 8 Similarly, the column side planetary gear 27
It is constantly in contact with the underside of the lobes.

Therefore, this pad side and column side planetary gear 29.27
When assembling wheels and gears, it is possible to prevent rattling or abnormal noise caused by gaps caused by errors, etc.

In addition, the planetary gears 27 and 29 on the pad side and column side
and the 'M star gear 31 on the fixed side are connected to one bearing Uniso 1-2.
2 and attached to the boss plate 5, it is not necessary to attach them to both sides of the boss plate 5 as in the conventional case, and the space within the planetary gear mechanism can be used more effectively.

In addition, since the fixed side planetary gear 31 is one planetary gear 31 that meshes with the sun gears 8 and 11 at the same time, the number of parts can be reduced, and one gear is provided for each of the sun gears 8 and 11. 2 in case of 2 pieces
There is no need to make complex adjustments such as phasing individual gears.

In addition, the iM gear 27.29 on the column side and pad side
Since they are each formed in the same shape, a mold can be shared during manufacturing, and therefore manufacturing costs can be reduced.

Then, the TIN gear 27 on the column side and pad side.
29 does not have a very three-dimensional shape, so there is no need to worry about resin whiskers or gear center deviation when the planetary gears 27 and 29 are made of resin, and
It is also possible to prevent poor engagement due to the above-mentioned manufacturing errors.

Further, an E-ring 33 is inserted between the gear shaft 29b of the pad-side planetary gear 29 and the upper bearing plate 25 to restrict the vertical movement distance of the column-side and pad-side planetary gears 29°31. This makes it possible to prevent the pad portion 13 from wobbling in the direction of rotation of the steering wheel.

Note that the present invention is not limited to the above embodiments,
For example, it may be implemented as shown below.

(1) The E-ring 33 may be fitted into the gear shaft 27b of the planetary gear 27 on the column side. However, it is necessary to provide a certain gap between the outer end surface of the 'M star gear 27.29 and the upper and lower bearing plates 25.26. If this is not done, the planetary gears 27 and 29 will not be able to move in the vertical direction.

(2) four parts 27a provided on each of the planetary gears 27, 29;
At 29a, both ends of the parallel pin 30 may be provided to slide.

Effects of the Invention As detailed above, according to the present invention, the sun gear and the planetary gears are formed of helical gears, and the pad side and The planetary gear on the column side is attached with two wooden pins, and an elastic member is provided on the outer periphery of the pin, and at least one fixed side gear is attached to the adjacent part to mesh with both the pad side sun gear and the column side colon gear. Since each of the planetary gears is mounted in the bearing unit using the ML double gear design, the space within a part of the pan 1 can be used effectively, and there are no gaps between the planetary gear and the sun gear, as well as finishing errors and assembly errors. This has the excellent effect of suppressing gaps between gears based on the above.

[Brief explanation of drawings]

Fig. 1 is a cutaway perspective view of essential parts showing an embodiment embodying the present invention, Fig. 2 is a side partial sectional view showing the steering wheel of this embodiment, and Fig. 3 is a planetary gear on the pad side and column side. FIG. 4 is a conventional view. Boss plate...5 Column side sun gear...8 Pad side sun gear...11 Bearing unit...22 Column side planet gear...27 Pad side planet gear...29 Elastic member...28 Pin...3゜ Fixed side planetary gear...31

Claims (1)

[Claims] 1. In a steering wheel equipped with a planetary gear mechanism for making the pad portion immobile, the sun gear (8, 11
) and planetary gears (27, 29, 31) are helical gears, and the pad-side planetary gear (29) meshes with the pad-side sun gear (11) and the column-side planetary gear meshes with the column-side sun gear (8). The gear (27) is connected to at least two pins (3) mounted at positions offset from the center of each.
0), and an elastic member (28) is inserted between each planetary gear (27, 29) to urge them in opposite directions on their respective axes, and a portion close to the planetary gear (27, 29) is attached. is provided with at least one fixed-side planetary gear (31) that meshes with both the sun gears (8, 11), and the column-side and pad-side planetary gears (27, 29) and the fixed-side planetary gear (31) A steering wheel characterized in that it is mounted in a bearing unit (22) and attached to a boss plate (5). 2. Gear shaft (29a) of the pad side planetary gear (29)
The steering wheel according to claim 1, characterized in that an E-ring (33) is installed between the upper bearing plate (25) of the bearing unit (22) and the upper bearing plate (25) of the bearing unit (22).