JP2014129070A - Steering column shaft fitting structure of automobile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the number of engineering steps and experimentation man hours by separating a component for vibration absorption carried out by a post bracket from a component for shock absorption to facilitate design control.SOLUTION: The other end of a post bracket 8 having one end fixed to a steering shaft 2 in an axially supported state by a fastening tool 7 such as a bolt is fixed to a car body 10. The post bracket 8 extends in the longitudinal direction of the car body 10. The one-end side axial support part P1 and the other end side fixing point P2 of the post bracket 8 are offset in the vertical direction of the car body 10. Thus, when a shock force is applied at the time of automobile collision, a steering column shaft 3 is swung with respect to the post bracket 8 to move a steering wheel 1 away from a driver, and the post bracket 8 resists vibration propagated from the tire to exhibit vibration absorption performance.

Description

  The present invention relates to a steering column shaft mounting structure in which a steering column shaft into which a steering shaft in an automobile is inserted so as to be capable of steering rotation is mounted.

  Conventionally, for example, a technique shown in FIG. 3 is known as a steering column shaft mounting structure of this type of automobile. According to FIG. 3, the steering column shaft c is attached to the cylindrical steering member a having both ends attached to the left and right sides of the vehicle body via the column bracket b, and the column bracket b and the steering member a are bifurcated. The other end side of the post bracket d to which one end side divided into two is attached to a vehicle body e such as a dashboard.

  As shown in FIG. 4, the column bracket b for mounting the steering column shaft c is attached to the steering member a extending in the left-right direction of the vehicle body by welding or the like. The steering member a is mounted on the left and right side walls of the vehicle body via vehicle body mounting brackets i and i at both ends thereof, and an instrument panel (not shown) is provided in the vehicle body left and right middle portion of the steering member a. A plurality of instrument stays j are attached for mounting.

  This type of steering column shaft mounting structure for automobiles generates vibration force transmitted to the steering shaft that is inserted into the steering column shaft c through the tire so as to be capable of steering rotation due to unevenness on the road when the automobile is running. It is necessary to configure the mounting structure of the steering column shaft b with a predetermined vibration absorption characteristic so that it is not transmitted to the occupant, and the vehicle body is deformed when an automobile collision accident occurs and the steering In order to prevent the steering wheel g from moving in the direction of the driver through the steering shaft f inserted through the column shaft c so as to be able to rotate by steering, the driver cannot escape from the passenger compartment. Shock absorption performance to prevent g itself from moving to the driver side It is required to have.

  In view of this, in the conventional vehicle steering column shaft mounting structure, first, with respect to vibration absorption characteristics, the vehicle is mounted by attaching the steering column shaft c and the steering member a to the vehicle body e via the column bracket b. When the vehicle is vibrated through the tires due to unevenness on the road during driving, etc., the post bracket d is stretched by its rigidity, so that a predetermined vibration absorption characteristic is exhibited, and the driver from the steering wheel to the driver Vibration propagation is suppressed.

  On the other hand, in the structure for mounting a steering column shaft of an automobile, when the automobile encounters a collision accident or the like, the impact h passes through a steering member a and a column bracket b via a highly rigid post bracket d. Then, a force in the K direction is generated on the steering column shaft c, pushing the steering wheel g toward the driver side, and hindering the driver from escaping from the passenger compartment.

  For this reason, in the conventional automobile steering column shaft mounting structure, the post bracket d absorbs the impact from the vehicle body e by, for example, disposing the bellows structure in the middle and crushing it, thereby driving the steering wheel g. It is possible to move to a position away from the driver so that the driver can escape from the passenger compartment (see, for example, Patent Document 1).

JP 2010-215232 A

  However, the conventional structure for mounting a steering column shaft of an automobile adopts a structure in which the post bracket d is mounted on the column bracket b at one end side and mounted on the vehicle body e at the other end side. Because the shock absorption performance by applying a bellows structure to be crushed by impact and the vibration absorption performance that exhibits sufficient rigidity against the impact force from the vehicle body are made compatible by the shape and configuration of the post bracket d The design of the post bracket has become quite difficult, and in order to overcome this, considerable design man-hours and experimental man-hours have to be spent.

  Therefore, in view of the unsolved problems in the conventional technology, the present invention facilitates design management by separating the component part for vibration absorption and the component part for shock absorption that the post bracket bears, This is to reduce the design man-hours or experiment man-hours.

  A steering column shaft mounting structure according to the present invention is a steering column shaft mounting structure for mounting a steering column shaft into which a steering shaft for mounting a steering wheel is inserted so as to be capable of steering rotation. The other end of the post bracket, which is mounted in a state of being pivotally supported by a fastener such as a bolt, is attached to the vehicle body, the post bracket extends in the front-rear direction of the vehicle body, and the one end side pivot point of the post bracket And the other end side mounting point are offset in the vertical direction of the vehicle body, so that the steering column schft can be moved with respect to the post bracket when subjected to an impact force due to an automobile collision or the like. Those who keep the steering wheel away from the driver Characterized by being configured to swing.

  In the present invention, the post bracket extends in the longitudinal direction of the vehicle body, and both ends thereof are respectively attached to the steering column shaft and the vehicle body. When the vehicle is traveling, a predetermined vibration absorbing characteristic can be exhibited so that the steering shaft does not vibrate due to unevenness on the road and propagates to the occupant.

  Further, according to the present invention, one end side of the post bracket is attached to the steering column shaft in a state of being pivotally supported by a fastener such as a bolt, and both end mounting fulcrums of the post bracket are offset from each other in the vertical direction of the vehicle body. Therefore, when the vehicle receives an impact from the car body when it encounters a collision accident, etc., the steering column shaft swings around the pivot point at one end of the post bracket, and the steering wheel is operated. The vehicle can be moved away from the driver, and as a result, the driver can escape from the passenger compartment.

  Moreover, the present invention is configured such that one end side of a post bracket whose other end is mounted on the vehicle body is mounted on the steering column shaft in a pivoted state, and the steering column shaft is swung to move the steering wheel away from the driver. As a result, the vibration absorption characteristic function due to the rigidity of the post bracket and the shock absorption characteristic function due to the swing of the steering column shaft can be separated in terms of configuration, making the design of the steering column shaft mounting structure very easy. Thus, design man-hours and experiment man-hours can be reduced.

1 is a side view of a steering column shaft mounting structure according to an embodiment of the present invention, which is drawn from the side of a vehicle body in a longitudinal direction. FIG. 2 is an explanatory diagram depicting a swinging state of a steering column shaft with respect to a post bracket when an automobile encounters a collision accident or the like in the steering column shaft mounting structure in FIG. 1. It is the side view which longitudinally cut the steering column shaft attachment structure in a prior art, and was drawn from the vehicle body side surface side. FIG. 4 is a perspective view depicting a schematic configuration of a steering member structure employing the steering column shaft mounting structure in FIG. 3.

  In the steering column shaft mounting structure according to the embodiment of the present invention, design management is facilitated by separating a component part for vibration absorption and a component part for shock absorption that the post bracket bears. It is designed to reduce the number of experiment steps.

  Next, a steering column shaft mounting structure according to an embodiment adopting the present invention will be described with reference to the drawings.

  First, a steering column shaft mounting structure according to an embodiment of the present invention will be described with reference to FIG.

  In such a steering column shaft mounting structure, a steering shaft 2 for mounting the steering wheel 1 is inserted into the steering column shaft 3, and the steering wheel 1 is rotated via the steering device 4, thereby a tire (not shown). It is configured so that it can be steered.

  The steering column shaft 3 is supported by a steering member 6 mounted in a state extending in the left-right direction of the vehicle body by a column bracket 5 and, for example, a post bracket by a fastener 7 such as a bolt on the lower end side. One end side of 8 is mounted in a pivoted state.

  The other end side of the post bracket 8 is attached to the vehicle body 10 such as a dash panel using welding or a fastening tool 9 such as a bolt so as to extend upward in the front-rear direction of the vehicle body 10.

  The one end side pivot fulcrum P1 of the post bracket 8 to the steering shaft 2 and the other end side mounting point P2 on the vehicle body 10 side are offset in the vertical direction of the vehicle body 10. The side shaft fulcrum P1 and the other end mounting point P2 and the axis P3 of the steering member 6 are connected to each other to form a triangle S.

  The tearing column shaft mounting structure according to the present invention configured as described above is used when a force that vibrates the steering shaft 2 via a tire (not shown) due to unevenness on the road or the like during traveling of an automobile is applied. As with the prior art, the rigidity of the post bracket 8 for mounting the steering column shaft 3 to the vehicle body 10 absorbs the vibration by tension and prevents the vibration from propagating to the driver via the steering wheel 1. It will exhibit vibration absorption characteristics.

  Further, in the tearing column shaft mounting structure according to the present invention configured as described above, the steering column shaft 3 is mounted with the other end side of the post bracket 8 attached to the vehicle body 10 being pivotally supported by a fastener 9 such as a bolt. In addition, the one end side pivot point P1 of the post bracket 8 to the steering shaft 2 and the other end side attachment point P2 on the vehicle body 10 side are offset from each other in the vertical direction of the vehicle body 10. When the vehicle receives an impact (deformation load) from the vehicle body 10 when it encounters a collision accident or the like, the steering column shaft 3 swings in the direction of arrow A in FIG. To move the steering wheel away from the driver (for example, forward direction of the car) as shown in FIG. In, it would allow escape from the passenger compartment of the driver.

  In addition, the tearing column shaft mounting structure according to the present invention configured as described above is such that the one end side mounting of the post bracket 8 to the steering column shaft 3 is in a pivoted state, and the steering column shaft 3 is swung. Since the steering wheel 1 is configured to be away from the driver, the vibration absorption characteristic function that is exhibited by stretching by the rigidity of the post bracket 8 and the shock absorption characteristic performance that is exhibited by the swinging of the steering column shaft 3 Can be separated from each other in structure, making the structural design very easy, and reducing the design man-hours and experiment man-hours.

  In the above embodiment, the post bracket 8 extending in the front-rear direction of the vehicle body 10 is mounted on the vehicle body 10 after extending in the upward direction of the vehicle body 10. After being extended, it may be mounted on the vehicle body 10.

  Further, the post bracket 8 in the above embodiment is configured to be mounted on the steering column shaft 3 and the vehicle body 10 at both ends thereof, but is not limited to this. You may make it wear.

  Further, it is conceivable that the column bracket 5 may be eliminated by attaching the post bracket 8 directly to the steering member 6 by making the post bracket 8 a rigid structure that can sufficiently perform the vibration characteristic function.

  The present invention described above should facilitate design management and reduce design man-hours or experiment man-hours by separating the vibration absorption component and the shock absorption component that the post bracket bears. Therefore, it can be said that the present invention is suitable for a steering column shaft mounting structure in which a steering column shaft into which the steering shaft is inserted so as to be capable of steering rotation is mounted.

DESCRIPTION OF SYMBOLS 1 Steering wheel 2 Steering shaft 3 Steering column shaft 4 Steering device 5 Column bracket 6 Steering member 7 Fastening tool 8 Post bracket 10 Car body

Claims (1)

  A steering column shaft mounting structure for mounting a steering column shaft into which a steering shaft for mounting a steering wheel is inserted so as to be capable of steering rotation. One end of the steering shaft is fastened with a fastener such as a bolt. The other end of the post bracket mounted in a support state is mounted on the vehicle body, the post bracket extends in the front-rear direction of the vehicle body, and the one end side pivot support point and the other end side mounting point of the post bracket are the vehicle body The steering column schft swings away from the driver with respect to the post bracket when it receives an impact force due to an automobile collision or the like. A vehicle steering wheel characterized by being configured to Ring column shaft mounting structure.

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