JPS6027078Y2 - steering device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a steering device used in an automobile.

Steering devices for some large vehicles have a booster connected to a slave lever connected to a drag link that interlocks a knuckle arm, and the slave lever is rotated by expansion and contraction of the booster.
The booster has one end connected to the slave lever and the other end connected to the body through a journal, and in some steering devices, the booster is connected to the slave lever and the body so that the center of the sphere is connected to the axis of the booster. It was supported on the centerline and connected via a cantilevered spherical journal implanted in the slave lever and body.

(However, the center of the ball of the journal is not located on the rotation trajectory plane of the slave lever's axis center line.

) However, when the booster is connected to the slave lever and the body via the flat journal mentioned above, when the frame is torsionally displaced due to the reaction force that the car receives from the road surface while driving, or when the steering system is operated, the slave lever When bending stress is applied to the lever, bending stress is generated in the booster, and unreasonable stress is applied to the flat journal, the piston in the booster, and the piston seal, resulting in a problem of deterioration of their durability.

In addition, when the booster is connected to the slave lever and the body via the cantilevered spherical journal, the center of the spherical part, which is the point of application of the booster's operating force, is on the rotation trajectory plane of the slave lever's axis center line. Since the slave lever is not located in the same position, torsional stress is applied to the slave lever, and unreasonable stress is applied to the support portion of the slave lever for the body, resulting in a problem of deterioration of its durability.

The present invention was devised in view of the above, and includes a slave lever rotatably supported on a tenon and connected to a drag link, one end of which is connected to the slave lever, the other end of which is connected to the body, and the center of the sphere. In a steering device having a booster connected via a spherical journal located on the axis center line of the steering device, a spacer is provided on a pin supporting the ball of the spherical journal, and the spacer restricts rotation of the spherical journal. The gist of the present invention is a steering device characterized in that the axial center line of the booster and the axial center line of the slave lever are located on substantially the same plane.

According to the present invention, the axial center line of the slave lever and the axial center line of the booster are located on substantially the same plane, and both ends of the booster have spherical journals in which the centers of the spherical parts are located on the axial center line of the booster. Since it is connected to the slave lever and the body via the booster, bending stress acting on the booster and torsional stress acting on the slave lever can be reliably prevented, and the above-mentioned problems of the conventional device can be solved.

Further, according to the present invention, the pin of the spherical journal is provided with a spacer for restricting rotation of the spherical journal, which is effective in preventing excessive rotation of the spherical journal.

Hereinafter, an embodiment in which the present invention is applied to an automobile having two front axles will be described in detail with reference to the accompanying drawings.

In the figure, reference numeral 2 denotes the frame of the automobile, 4 and 6 the front and rear wheels supported by the frame 2 via suspensions (not shown), and 8 and 10 the front and rear wheels 4 respectively.
Knuckle arms 12 and 14 are connected to knuckle arms 8 and 10 at one end, respectively, and drag links 16 and 18 are pivoted at one end to brackets 20 and 22 attached to frame 2, respectively. 24 is a connecting link that connects the slave levers 16 and 18 via a flat journal or the like, and 26 has one end attached to the frame 2. Although not shown in the drawings, the spherical portion is connected to the bracket 28 via a cantilevered spherical journal located on the center line of the axis, and the other end is connected to the slave lever 16 via a spherical journal 29 supported at both ends, similar to the conventional device described above. It is a booster.

The axial center line of the booster 26 and the axial center line of the slave lever 16 are configured to be located on substantially the same plane, and a link that is not shown in the drawings is connected to the intermediate portion of the booster 26, which is linked to the steering gear. When the steering gear is operated, the booster 26 is hydraulically expanded and contracted, and the slave lever 16 is rotated.

Further, the details of the connection between the booster 26 and the slave lever 16 are shown in FIG. 2, in which a yoke 30 is formed at the end of the booster 26, a pin 32 is fitted into the yoke 30, and a nut, etc. (not shown) is fitted into the yoke 30. is fixed by the same pin 3
A ball 34 is fitted onto the pin 32 and the ball 34, and a spherical journal 29 is formed by the pin 32 and the ball 34.
6, the ball 34 is rotatably supported by a spherical socket 38 fixed to the slave lever 16, and the center of the ball 34 is located on the axial center line of the booster 26.

Spacers 40 and 42 are interposed between the inner surface of the yoke 30 and the ball 34, respectively, and dust seals 44 and 46 are fitted over the spacers 40 and 42, respectively.

The spacer 42 is fitted and fixed to the pin 32 that supports the ball 34, is placed close to the slave lever 16, and is formed to have a larger diameter than the opening for the spherical journal 29 formed in the slave lever 16. The rotation of the spherical journal 29 is restricted.

According to the above configuration, the axial center line of the slave lever 16 and the axial center line of the booster 26 are located on substantially the same plane, and the centers of the spherical portions of both ends of the booster 26 are located on the axial center line of the booster 26. Since it is connected to the bracket 28 and the slave lever 16 via the located spherical journal, bending stress acting on the booster 26 and torsional stress acting on the slave lever 16 can be reliably prevented.
This has the effect of being able to eliminate the problems of the conventional device described above.

Further, according to this embodiment, one of the spacers 40 and 42 fitted to the pin 32 is formed to have a larger diameter than the opening for the spherical journal 29 formed in the slave lever 16, When the spherical journal 29 rotates, it comes into contact with the slave lever 16 to restrict the rotation, which prevents excessive deformation of the seal 46 and provides excellent durability.

In the above embodiment, the booster 26 is the slave lever 1
6 via a spherical journal 29 supported at both ends; however, the above implementation can also be carried out by using a cantilevered spherical journal whose spherical center is located on the axial center line of the booster 26 instead of the spherical journal 29. The same effect as the example can be achieved.

Although the booster 26 is connected to the bracket 28 via a cantilevered spherical journal (not shown), a spherical journal supported at both ends may be used instead.

[Brief explanation of the drawing]

FIG. 1 is a schematic side view showing an embodiment of the present invention, and FIG. 2 is an enlarged cross-sectional view taken along the line ■-■ in FIG. 1. 2...Frame, 12.14...Drag link, 16,18...Slave lever,
24...Connecting link, 26...Tune booster, 29.Tune/spherical journal.

Claims (1)

[Scope of utility model registration request] A slave lever is rotatably supported on the body and connected to a drag link, and one end is connected to the slave lever and the other end is connected to the body through a spherical journal whose spherical center is located on the axis center line of the slave lever. In the steering device having a booster connected to each other, a spacer is provided on a pin that supports the ball of the spherical journal, and the spacer is configured to restrict rotation of the spherical journal, and the axial center line of the booster and the slave A steering device characterized in that the steering device is configured such that an axis center line of a lever is located on substantially the same plane.