JPH0441017Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a tilt steering device installed in an automobile, and in particular, when the tilt lock mechanism that locks the steering shaft at a desired tilted position is unlocked, the biasing mechanism is activated. The present invention relates to a tilt steering device in which the steering shaft tilts toward a reference position and rises due to the action, and the steering shaft collides with a locking portion and is locked at the reference position.

[Conventional technology]

Conventionally, as an example of a tilt steering device 1, one configured as shown in FIGS. 3 and 4 has been provided, in which a steering shaft 2 is pivotally supported on a vehicle body and is swung around a swiveling center C. .

A tilt lock mechanism 4 for locking the steering shaft 2 at a desired tilted position is provided, and a spring 3 for supporting the weight of the steering shaft 2 is also provided.

Also, the steering shaft 2 is connected to the spring 3.
A rubber stopper 10 is provided at the locking portion of the body 5 and the like to weaken the impact caused by the locking of the body 5 and the like when the body 5 and the like are driven to the reference position.

[Problem that the invention attempts to solve]

By the way, in such a conventional tilt steering device 1, when the tilt lock mechanism 4 is in the unlocked state, the steering shaft 2 is driven to the reference position, that is, until the tip of the steering shaft 2 is locked to the body etc. However, at this time, the only thing that cushions the impact is the rubber stopper 10, and the locking of the steering shaft 2 by the rubber stopper 10 generates a hitting sound and the tilt steering device 1 bounces back, causing flapping. Or,
There is a problem where the vehicle body vibrates.

As mentioned above, in such a device, the steering shaft 2 is raised by the action of the biasing mechanism (spring) when the lock is released, so the driver rarely holds the steering wheel when the steering shaft is raised. In addition to the problem of the steering shaft 2 colliding forcefully with the locking part and producing a banging sound, the weight of the steering wheel acts in the opposite direction to the biasing direction of the biasing mechanism, so the steering shaft 2 may collide with the locking part after the collision. Inconveniences such as fluttering and vibration occur.

In particular, the door-linked tilt (when the driver gets on and off,
In the mechanism (which automatically releases the tilt by opening and closing the door and pops up the steering shaft 2), the above-mentioned problem becomes noticeable because the biasing force of the spring 3 is large.

The present invention attempts to solve these problems by providing a tilt steering device with a shock absorbing mechanism that prevents the steering shaft from fluttering by locking the steering shaft through frictional engagement. The purpose is to

[Means for solving problems]

For this reason, the tilt steering device with a shock absorbing mechanism of the present invention includes a tilt lock mechanism that locks the steering shaft at a required tilted position, and a tilt lock mechanism that locks the steering shaft at a required tilted position and a reference position that raises the steering shaft from the required tilted position. a biasing mechanism that biases the steering shaft; and a locking portion that locks the steering shaft at the reference position in opposition to the biasing force of the biasing mechanism when the tilt lock mechanism is unlocked; A shock absorbing mechanism for mitigating collisions of the steering shaft is provided, and the shock absorbing mechanism includes a pair of contacts attached to the vehicle body side and arranged opposite to each other, the opposing portions of which are formed in a spherical shape; A flat stopper guide is attached to protrude in the tilting direction of the steering shaft so as to enter between the pair of contacts when the stopper guide returns to the reference position, and the pair of contacts come into contact when the stopper guide enters both of the contacts. A pair of springs are provided to bias the pair of contacts so as to sandwich the stopper guide between the contacts.

[Effect]

In the above-mentioned tilt steering device with a shock absorbing mechanism of the present invention, the shock absorbing mechanism has a pair of contactors attached to the vehicle body side and arranged facing each other, and a shock absorber between the pair of contactors when the steering shaft returns to its reference position. a stopper guide protrudingly attached to the steering shaft in order to penetrate into the steering shaft; and a pair of springs provided to bias both contacts so that the stopper guide is sandwiched between the contacts when the stopper guide enters between the two contacts. Because of this structure, when the steering shaft rises when the lock is released, the stopper guide attached to the steering shaft enters between the pair of contacts attached to the vehicle body, and
A pair of contacts biased by a pair of springs sandwich the stopper guide and provide frictional resistance to the stopper guide, so that the tilting force of the steering shaft biased by the biasing means is reduced and the steering shaft slowly returns to the reference position. This effectively suppresses the knocking noise and vibrations that occur when the steering shaft is sprung up.

In addition, since the opposing parts of the pair of contacts urged by a pair of springs are formed in a spherical shape, the flat stopper guide can smoothly enter between the pair of contacts. Since it is formed into a flat plate shape that protrudes in the shaft tilting direction, stable frictional resistance can be obtained against the tilting displacement of the steering shaft after the stopper guide enters between the pair of contacts, and especially when the steering shaft is engaged. A stable damping force can be exerted against the vibration of the steering shaft after colliding with the stop, and the fluttering of the steering shaft upon return can be efficiently suppressed.

〔Example〕

Hereinafter, an embodiment of the present invention will be explained with reference to the drawings. Figures 1 and 2 show a tilt steering device with a buffer mechanism as an embodiment of the present invention, and Figure 1 is a schematic side view thereof, and Figure 2 is a schematic side view thereof. The figure is a sectional view schematically showing the main part.

As shown in Figs. 1 and 2, the device of this embodiment has the following features:
The structure is substantially the same as the conventional example shown in FIGS. 3 and 4, and the same reference numerals indicate substantially the same parts.

In this embodiment, a friction damper 6 as a buffer mechanism is attached to each body as a locking portion of the steering shaft 2.

The body 5 includes a stopper guide 7 protruding from the bottom surface of the tip of the steering shaft 2, and a hemispherical roller 8 as a contact attached to the body 5.
and a spring 9 that biases the hemispherical roller 8, so that the hemispherical roller 8 sandwiches the stopper guide 7 by the biasing force of the spring 9. Here, the stopper guide 7 is formed in a flat plate shape with a pair of parallel flat surfaces 7a, 7a protruding in the tilting direction of the steering shaft as sliding surfaces for a pair of hemispherical rollers 8, 8. The structure is such that the penetrating material can smoothly enter between the hemispherical rollers 8, 8.

Note that the portion of the body 5 below the hemispherical roller 8 has holes 11 so that the stopper guide 7 can enter therein.
is formed.

Further, the tilt lock mechanism 4 is designed to be unlocked in conjunction with the opening and closing of the door, and the spring 3 has a large spring constant so that the steering shaft 2 can be popped up with sufficient speed at that time. .

Since the tilt steering device with a shock absorbing mechanism as an embodiment of the present invention is constructed as described above, when the tilt lock mechanism 4 in the tilt steering device 1 is in the unlocked state, the steering shaft 2 is swung by the spring 3. The tip of the tilt steering device 1 is connected to the body 5.
collide with

At this time, the stopper guide 7 of the steering shaft 2 moves into the friction damper 6 while pushing the hemispherical roller 8 apart.

Since the hemispherical roller 8 is biased by the spring 9, the frictional force caused by the pressing force acts as a force that prevents the stopper guide 7 from entering, and the friction between the stopper guide 7 and the hemispherical roller 8 causes the steering shaft 2 ( The kinetic energy of the stopper guide 7) is absorbed.

Thereafter, the stopper guide 7 enters the hole 11 and stops, but even if the stopper guide 7 tries to come out in the opposite direction, it is prevented by the friction between the stopper guide 7 and the hemispherical roller 8.

In this way, the buffering mechanism for alleviating the collision of the steering shaft 2 with the locking portion includes the hemispherical rollers 8, 8 as a pair of contacts attached to the vehicle body and arranged facing each other, and the steering shaft 2. A stopper guide 7 is attached to the steering shaft 2 so as to protrude between the pair of hemispherical rollers 8 and 8 when the stopper guide 7 returns to the reference position of the steering shaft 2.
and both hemispherical rollers 8, 8 of the stopper guide 7.
Both hemispherical rollers 8, 8 are used to sandwich the stopper guide 7 between the hemispherical rollers 8, 8 when the stopper guide 7 is inserted into the gap.
8 and a pair of springs 9, 9, which are respectively biased, when the steering shaft 2 rises when the lock is released, the stopper guide 7 attached to the steering shaft 2 is attached to the vehicle body side. The pair of hemispherical rollers 8, 8 that are biased by the pair of springs 9, 9 sandwich the stopper guide 7 and provide frictional resistance to the stopper guide 7. The tilting force of the steering shaft 2 biased by the spring 3 can be eased and the steering shaft 2 can be returned to the standard position slowly, and the knocking noise and vibration when the steering shaft 2 is raised can be efficiently suppressed.

In addition, since the opposing portions of the pair of hemispherical rollers 8, 8, which are biased by the pair of springs 9, 9, are formed in a spherical shape, the flat stopper guide 7 can be moved between the pair of hemispherical rollers 8, 8. In addition, since the stopper guide 7 has flat planes 7a, 7a that protrude in the direction of tilting of the steering shaft 2, the stopper guide 7 can be moved into a pair of hemispherical rollers 8, 8. Steering shaft 7 after entering between
A stable frictional resistance can be obtained against the tilting displacement of the steering shaft 2, and a stable damping force can be exerted especially against the vibration of the steering shaft after the steering shaft 2 collides with the locking part. It is possible to efficiently suppress the fluttering of the shaft.

[Effect of idea]

As described in detail above, the tilt steering device with a shock absorbing mechanism of the present invention includes a tilt lock mechanism that locks the steering shaft at a required tilted position, and a reference position where the steering shaft is raised from the required tilted position. a biasing mechanism that biases the steering shaft to the reference position; and a locking portion that locks the steering shaft at the reference position by opposing the biasing force of the biasing mechanism when the tilt lock mechanism is unlocked; A buffer mechanism for mitigating collisions of the steering shaft is provided, and the buffer mechanism includes a pair of contacts attached to the vehicle body and arranged facing each other, the opposing portions of which are formed in a spherical shape, and the steering shaft. a flat stopper guide protruding in the tilting direction of the steering shaft so as to enter between the pair of contacts when the stopper guide returns to the reference position; It has a simple structure consisting of a pair of springs provided by biasing the pair of contacts so as to sandwich the stopper guide between the contacts, and when the steering shaft rises when the lock is released, the steering The stopper guide attached to the shaft enters between a pair of contacts attached to the vehicle body, and the pair of contacts urged by a pair of springs sandwich the stopper guide and apply frictional resistance to the stopper guide. The tilting force of the steering shaft biased by the biasing means can be reduced to allow it to return slowly to the reference position, and the knocking noise and vibrations when the steering shaft is raised can be efficiently suppressed.

Further, since the opposing portions of the pair of contacts urged by the pair of springs are formed in a spherical shape, there is an advantage that the flat stopper guide can smoothly enter between the pair of contacts. moreover,
Since the stopper guide is formed into a flat plate that protrudes in the direction of tilting of the steering shaft, stable frictional resistance can be obtained against the tilting displacement of the steering shaft after the stopper guide enters between the pair of contacts. This has the advantage that a stable damping force can be exerted against the vibration of the steering shaft after the shaft collides with the locking portion, and that the fluttering of the steering shaft upon return can be efficiently suppressed.

[Brief explanation of the drawing]

Figures 1 and 2 show a tilt steering device with a shock absorbing mechanism as an embodiment of the present invention. Figure 1 is a schematic side view thereof, and Figure 2 is a sectional view schematically showing its main parts. 3 and 4 show a conventional tilt steering device, with FIG. 3 being a schematic side view thereof, and FIG. 4 being a schematic sectional view of its main parts. DESCRIPTION OF SYMBOLS 1... Tilt steering device, 2... Steering shaft, 3... Spring as a biasing mechanism, 4... Tilt lock mechanism, 5... Body as a locking part, 6... Friction damper as a buffer mechanism. 7... Stopper guide, 8... Hemispherical roller as a contact, 9... Spring, 10... Rubber stopper, 11... Hole, C...
Center of oscillation.

Claims (1)

[Scope of utility model registration request] The tilt steering device includes a tilt lock mechanism that locks the steering shaft at a required tilted position, an urging mechanism that biases the steering shaft to a reference position raised from the required tilted position, and a lock release in the tilt lock mechanism. A buffer mechanism is provided, which includes a locking portion that locks the steering shaft at the reference position against the biasing force of the biasing mechanism, and alleviates a collision of the steering shaft with the locking portion, The buffering mechanism is provided between a pair of contactors that are attached to the vehicle body side and are arranged to face each other and have opposing portions formed in a spherical shape, and between the pair of contactors when the steering shaft returns to the reference position. a flat plate-shaped stopper guide protruding in the tilting direction of the steering shaft for intrusion; and a pair of contacts for sandwiching the stopper guide between the pair of contacts when the stopper guide intrudes into both the contacts. A tilt steering device with a shock absorbing mechanism, characterized by comprising a pair of biased springs.