JPS60131373A - Rear wheel steering mechanism for front/rear wheel steering car - Google Patents

Abstract

PURPOSE:To enable faint control through simple structure by providing a lever for moving a gear case in the opposite direction from the moving direction of rack shaft in predetermined range near straight advance. CONSTITUTION:In the rear wheel side steering mechanism, a rear gear case 14 is supported on a member at the chassis side to be movable along the moving direction of rack shaft 13 through a bearing 23. A lever 18 is fixed rotatably through a shaft 19 to the rear gear case 14 where the leading edge section of one arm section 18a of lever 18 is coupled through a link 20 to the chassis side member 24 while a pin 21 is fixed to the leading edge section of the other arm section 18b where the pin 21 is fitted slidably in a groove 22 made in the rack shaft 13. The rack shaft 13 of rear side steering mechanism is movable in the opposite direction from the moving direction of rack shaft 5 of front wheel steering mechanism.

Description

[Detailed description of the invention] - The invention is backwards and forwards! It concerns the rear wheel steering device μ of a steered vehicle. - Front and rear wheel steering vehicles have already been developed and are publicly known, in which the rear wheels as well as the rear wheels are steered by operating the steering wheel and steering wheel.
8-20565/publication).

Generally speaking, the idea behind front and rear axle steering is that it is better to run at a fast speed, and it is also known that -1 reverse phase steering is good for every front and rear wheel in F1 in order to improve maneuverability at low speeds and to avoid reducing the required inner wheel difference. , known to.

So, we focused on the fact that when running at a steady speed, the steering angle is generally small and it is difficult to make a large steering angle when running at a steady speed. 1 is in-phase steering, and the rest of the steering angle range is 1RF rear wheel anti-phase steering, thereby satisfying both requirements of ¥44 (Japanese Unexamined Patent Publication No. 58-97565,
(Refer to Japanese Patent Application Laid-Open No. 58-97566) However, such conventional mountings have a structure that is difficult to accommodate, and parts that require a special viscosity of 1 wJ must be used separately, which reduces productivity. However, it turns out that Il fell down and had a gun price, so I had some bribe money.

'4 Does the invention eliminate the above-mentioned problems of the conventional mechanism and improve the mechanism? The present invention will be described below with reference to one embodiment.

In Fig. 1, 1 is a steering handle, 2 is a steering shaft, and the steering shaft 2 is a universal joint) 3, 3', and an intermediate shaft 2'.
It is connected to Vinio/4 via metal.

Reference numeral 5 denotes a rack shaft having a rack shaft that meshes with the pinion 4. The rack shaft 5 is fitted into the front cage 26 so as to be slidable in the axial direction, and the pinion 4 is rotated by operating the steering handle 10 times. to move the rack shaft 5 in the axial direction.
By moving 1y+, the MiJjK@9 is rotated through the quirod 7 and knuckle arm 8, and the steering is turned on. It is the same as pinion type steering & ILj.

A rear wheel steering force extraction binion 10 that meshes with the rack teeth of the rack shaft 5 and rotates in the axial direction of the rack shaft 5 is rotatably mounted on the front gear case 6. is connected to a pinion 12 of a rear wheel steering shaft, which will be described later, via a rear wheel steering shaft 11. 11' is a universal joint containing water.

The rear wheel side steering device includes the above-mentioned binion 12, a rack shaft 13 having rack teeth that mesh with the above-mentioned binion 12, and the pinion 12yt.
This rack and pinion type steering gear is almost the same as the front wheel side steering gear part, which is made up of a gear case 14 and a rack gear 113, but the front gear case 6 of the front wheel side steering gear case 6 is fixed to the vehicle body side member. On the other hand, the rear gear case 14 for the vehicle side steering system is connected to the rear gear case 14.
It has a structure in which it is supported by a bearing 23 on a member so as to be movable along the moving direction of the rack shaft 13,
In addition, a lever 18 is attached to the rear gear case 14 so as to be able to rotate once around a shaft 19, and the tip of one arm 18a of the lever 18 is connected to the vehicle body plaster material 24 through a link 20'lc-. A pin 21 is fixed to the tip of the arm part 186 of the charm, and the bottle 21 is slidably fitted into a hole 22 provided on the rack shaft 13 as described later. . 15 is the rear tie rod, 16 is the rear knuckle arm, and 17 is the rear vehicle width.

The rack shaft 13 of the rear wheel steering shaft is 11 so that it moves in the opposite direction to the moving direction of the rack shaft 5 of the IIJ width side steering device.
1Jhψ It's not your fault to be ignored.

The groove 22 of the rack shaft 13 has a cape as shown in Figure 2, and the circumference is parallel to X-X or is an axial concave groove 22 that is slightly inclined by 4 gi in the opposite direction to the inclination direction of the inclined groove sound 122'. ',
22'', and the bin 21 of the lever 18 is in the second
As shown in the figure, it is configured to be located at approximately the middle temperature of the inclined vortex kidney 22'.

In addition, the rear gear case 14 has a bottle 21 as shown in FIG.
In the above configuration, turn the steering wheel handle 1 once in the direction of arrow A, and move the rack shaft 5 to the left in Fig. 1. When moving, tie rod 7, knuckle arm 8
At the same time, the tlti wheel←9 rotates in the direction of the arrow through the pinion 10. The shaft 11 is an axis 1121 in the direction of arrow A', and the rear wheel side steering device W1. Rotate the pinion 12 and rack shaft 1
3 is the front wheel side edge 11P, and the rice rack shaft 5 moves in the direction of the furnace, that is, in the right direction in the figure.

Here, the moving direction of the rack shaft 5 of the front wheel steering device [A] is expressed as positive, and the opposite direction is expressed as negative.
Assuming that -B' moves y, the rt+ flea 22 moves from the actual position to the dotted line position due to the movement of the rack shaft 13, as shown in Figure 3, and its Iq' oblique vortex section Following the inclined shape of 22', the bin 21 is aligned with the axial center line X- of the rack shaft 13.
Displaced by B# in the direction approximately perpendicular to X.

Therefore, the lever 18 rotates in the time phase direction about the shaft 19 as shown in FIG. Since it is locked to the member 24 and cannot move in the direction parallel to the X-X line, the shaft 1 is rotated by turning 11 of the lever 18.
9 is 1 C=W×-,/! from the position in Figure 4 (a). 2 (However, -e1.-e2 is lever 18) Each publication '18α,
18b) in the forward direction, that is, in the direction of movement of the rack shaft 13, and in the opposite direction. It is forcibly moved in the forward direction, that is, in the opposite direction to the moving direction of the rack shaft 13.

Therefore, the rear tie rod 15 has only 11 B screws, and the displacement Bt of the rack shaft 13 relative to the rear gear case 14 is added to the displacement of the rear gear case 14 itself by 1 minute Ci, 2°-1°.

Therefore, the inclination angle of the inclined vortex portion 22' and the effective length of each arm of the lever 18/1. By setting A2 so that B>0, within the range α of the inclined groove portion 22', the wheel is steered in the same direction as the rear #& side rJ: n+4 wheel side, and the above range d is advanced by 1 m, By setting it in a nearby area, it is possible to perform in-phase steering with the rear width in the vicinity of the fishing line.

When the rack shaft 13 moves further in the negative direction and the bin 21 enters the axial groove 22, if the axial groove 22' is parallel to the X-X line, the lever 18 stops rotating and the rear gear case is moved. 1
4 stops, and when the axial groove 21 is tilted around 1 in the direction slightly opposite to the direction of inclination of the inclined groove portion 22' as shown, the lever 18 rotates slightly in the opposite direction, that is, in the counterclockwise direction. Since the rear gear case 14 moves somewhat in the negative direction like the rack shaft 13, the movement of the tie rod 15 is the same as the movement of the rack shaft 13, or the movement of the rack shaft 13 and the movement of the rear gear case 14 in the same direction. This value is the sum of the amount of movement, and becomes a negative direction, that is, a direction opposite to the direction of fju wheel steering 11, resulting in 9-shift reverse phase steering.

To illustrate the movement of the rack M13° rear gear case 147I and tie rod 15 in the embodiment shown in FIGS. 2 to 4 above, it is shown in FIG.
If the grooves 22 are configured so that the movement B' relative to the rear gear case 14 of No. 3 and the movement 11+C of the gear case 14 itself are smoothly transitioned, the change to the in-phase steering becomes continuous as shown in FIG. , ideal front and rear wheel steering 4 can be performed without causing any discomfort during steering.

In general, in terms of steering stability, the front wheel actual steering angle range to respond to external forces when traveling straight at high speed is extremely small, and the in-phase steering i of the rear wheels at that time is the number of lJ+J vehicle actual steering angles. minute-
It is said that it is best to set it to an extremely small value.

□Therefore, if the rear wheel steering is performed by decelerating IiJ wheel steering using gears as in the conventional device, it will be necessary to control the angle of IiJ, which is close to the cleanliness of the meshing surface of the gears. However, the manufacturing quality of ordinary automobile parts is not sufficient, and special high-viscosity parts must be used, resulting in extremely low productivity and a complex and expensive structure. It has an interlude.

In the present invention, a rack and pinion type steering system, which is almost the same as the rear wheel steering system, is used as the rear wheel steering system, and the gear case is made long enough to be movable along the axis of the rack shaft on the heavy body side member, and the gear case is made long enough to be movable along the axis of the rack shaft. The amount of movement of the rack shaft and the amount of movement of the gear case can be determined by an extremely simple construction that simply includes a lever or other hand that moves the gear case in the opposite direction to the direction of movement of the rack shaft within a predetermined nearby range. Since the in-phase steering of the rear wheels is set based on the difference in It is possible to perform a sufficiently small tbi control, and it is extremely advantageous in terms of raw materials and costs. No-J
However, in combination with being good, it can bring about great practical effects.

[Brief explanation of drawings]

Fig. 1 is an explanatory plan view showing an embodiment of the present invention, Fig. 2 is a sectional view of the essential issue of Fig. 1, and Fig. 3 shows the displacement mode of the bin when the rack axis moves as shown in Fig. 2. Explanatory diagram, the fourth is ((a)
, (b) are explanatory diagrams showing the rotational behavior of the lever due to the displacement of the bin in Figure 3, Figure 5 is a diagram showing the displacement 1 characteristic of the rear wheel (full tie rod), Figure 6 is the front and rear wheels. 1 is a diagram showing actual steering characteristics. 1... Steering wheel, 6... Front gear case, 10... Binion for rear wheel steering output extraction, 1
1... Shaft, 12... Pinion, 13... Rack shaft, 14... Rear gear case, 15... Tie rod,
16... knuckle arm, 17... rear car, 1B.
...Lever, 19...Shaft, 21...Bin, 22...
·groove. That's all. Figure 1 Figure 2 Figure 74

Claims (2)

[Claims] (1), the front wheel side steering operation is performed by human power 1 to the rear wheel side steering device.
As the rear wheel steering device of the front and rear wheel steering gear, which is configured to steer the rear wheels with the help of 7, the rear gear case includes a pinion that rotates with the steering operation of the 011 wheel side, and a pinion that engages with the pinion to rotate the 011 wheel side. Using a rack and pinion type steering device that moves in a direction away from the steering direction to steer the rear width, the rear gear case is installed inside the rack shaft, and the center line of the rack shaft is connected to the rear gear case. Attach a lever to the side of the vehicle body so that it can be moved in a direction along the rack axis, and move the rear gear case in the opposite direction to the rack axis as the rack axis moves in the W direction. A rear wheel steering device for a front and rear wheel steering type automobile, characterized in that a rear gear case movement control means (b') is provided for steering the rear width in the same direction as the front wheels by the difference in the amount of movement between the rack shaft and the rear gear case. (2) The rear gear case movement control means is rotatably pivoted to the rear gear case, is connected to one arm of the vehicle body side member, and is connected to the groove of the rack shaft in the rear gear case (6). A lever with a slide-fitting pin is also constructed.
(!When the rack shaft is moved in a straight line, the lever rotates in a direction that is not inclined to the direction of movement of the rack shaft when the rack shaft is moved in a predetermined range nearby, and the rear gear case is moved in a strong manner. Claim MP No. 1, which is characterized in that
A rear wheel steering device for a front and rear wheel steering vehicle described in Ayumu.