JP2013049353A - Rear suspension structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rear suspension structure capable of preventing an excessively large impact from being applied to a brake tube and hence damage or breakage from being caused, even when a brake tube is branched at a position deviated to one end side of an axle beam in the longitudinal direction and one of the brake tube is routed to either one of right and left wheel sides and the other of the brake tube is routed to the other wheel side.SOLUTION: The rear suspension structure 10 is of De Dion type having an axle beam 16 and a drive shaft 14. The axle beam 16 is routed in such a state that a brake tube 30 is branched. The brake tube 30 is routed to pass through a region that is ahead of a rear end position perpendicular surface 50 constituting the rearmost end of the axle beam 16 and that is above the axle beam 16.

Description

  The present invention relates to a rear suspension structure mounted on a vehicle.

  2. Description of the Related Art Conventionally, a rear suspension structure such as a dodion suspension disclosed in Patent Document 1 below is provided. This suspension structure is called a dodion-type rear suspension in which both ends of a rear axle are coupled by a beam. In the suspension structure disclosed in Patent Document 1, the brake tube is routed along side members disposed on the left and right.

JP 2000-25440 A

  As in the case of the axle beam employed in the above-mentioned dodion suspension, the brake tube may be routed to a structure having a shape in which the middle part is bent toward the rear of the vehicle with respect to both ends. . When such a structure is adopted, if the brake tube can be routed to the left and right at a position outside the bent portion located in the middle of the axle beam, a large impact will be applied to the brake tube when an impact is applied from the rear of the vehicle. It is possible to prevent the stones and the like wound by the wheels from colliding with the brake tube.

  However, for structural reasons, etc., the brake tube is branched at a position that is unevenly distributed on one end side in the longitudinal direction of the axle beam, and one of the brake tubes is routed on either the left or right wheel side, and on the other wheel side. In some cases, the other side of the brake tube must be routed. In this case, the brake tube must be routed so as to pass through a bent portion provided in the middle of the axle beam. Further, when the axle beam is installed on the vehicle, the bent portion protrudes toward the vehicle rear end side. Therefore, if the brake tube is routed in the bent part, the possibility of damage or breakage of the brake tube due to impact from the rear of the vehicle or collision of stones wound up by wheels etc. is completely denied. I can't.

  Accordingly, the present invention branches the brake tube at a position unevenly distributed at one end side in the longitudinal direction of the axle beam, and routes one of the brake tubes on either the left or right wheel side, and the brake tube on the other wheel side. An object of the present invention is to provide a rear suspension structure capable of preventing damage or breakage due to excessively large impact applied to the brake tube even when the other is wired.

  The rear suspension structure of the present invention provided to solve the above-described problem is a dodion type having an axle beam that supports left and right wheels at the rear end of the vehicle, and a drive shaft that transmits driving force to the wheels. Is. In the rear suspension structure of the present invention, a brake tube branched at a position unevenly distributed on one end side in the longitudinal direction of the axle beam is routed so as to reach both end portions of the axle beam. After a part or all of the vehicle is located on the vehicle rear end side with respect to the axial center position of the drive shaft, the axle beam is viewed in cross-section and is in surface contact with the axle beam on the vehicle rear end side. When assuming an end position vertical plane, an axial center vertical plane passing through the axial center position of the axle beam, and an inclined plane inclined through a predetermined angle through the axial center position of the axle beam toward the vehicle front side The vehicle front side of the rear end position vertical plane and the vehicle rear end side of the axial center position vertical plane, or the front side of the vehicle axis of the axial center position vertical plane. Wherein said brake tube from the inclined surface also to pass the upper side of the region is characterized in that it is laid.

  In the rear suspension structure of the present invention, there is a portion of the axle beam that is located on the vehicle rear end side with respect to the axial center position of the drive shaft. When such an axle beam is assumed to be the rear end position vertical plane, the axial center position vertical plane, and the inclined plane described above, an area on the vehicle front side of the rear end position vertical plane (hereinafter referred to as “rear collision safety area”). Is also a region where an excessively large impact is assumed not to act even if an impact is applied from the rear of the vehicle. In addition, an area on the vehicle rear end side with respect to the axial center position vertical plane, and an area on the vehicle front side with respect to the axial center position vertical plane and above the inclined surface (hereinafter also referred to as “stepping stone safety area”). This is an area where it is assumed that there is a very low possibility that a stone or the like wound up by a wheel will collide. In other words, the area below the inclined surface and ahead of the vehicle from the axial center vertical plane is an area where stones wound up by wheels are likely to collide (hereinafter referred to as “stepping stone danger”). The region excluding the stepping stone danger region corresponds to the stepping stone safety region described above.

  In the rear suspension structure of the present invention, the brake tube is routed in the above-described rear collision safety region and the stepping stone safety region. Therefore, according to the rear suspension structure of the present invention, it is possible to reliably prevent the brake tube from being damaged or broken due to the impact from the rear of the vehicle or the scattering of stones wound up by the wheels. be able to.

  In addition, since the brake tube can be prevented from being damaged or broken as described above, the brake tube can be routed without being branched in advance on the vehicle body side and branched in the vicinity of the rear suspension structure. Become. This eliminates the need to branch the brake tube in advance as in the prior art and route the brake tube along the left and right side members. Therefore, it is possible to minimize the number of brake tube fixing members installed at the upstream side (vehicle body side) of the rear suspension structure and the vicinity thereof.

  Further, as described above, by suppressing the fixing points of the brake tube, it is possible to reduce the number of parts and the weight of the vehicle as a whole, thereby contributing to improvement of fuel consumption and reduction of manufacturing costs. Further, since it is not necessary to branch the brake tube on the vehicle main body side, it is possible to easily perform installation and maintenance work of the brake tube for the vehicle.

  According to the present invention, the brake tube is branched at a position unevenly distributed on one end side in the longitudinal direction of the axle beam, one of the brake tubes is routed on either the left or right wheel side, and the brake tube is disposed on the other wheel side. Even when the other is wired, it is possible to provide a rear suspension structure capable of preventing an excessively large impact from being applied to the brake tube and preventing the brake tube from being broken or damaged.

(A) is a top view which shows the state which looked at the rear suspension structure which concerns on one Embodiment of this invention from the vehicle upper side, (b) is the state which looked at the rear suspension structure of (a) from the vehicle rear side. FIG. 1 is a perspective view showing a rear suspension structure according to an embodiment of the present invention. It is explanatory drawing for demonstrating the positional relationship of the rear collision safety area | region, a stepping stone safety area | region, and a stepping stone danger area | region with respect to an axle beam.

  Next, the rear suspension structure 10 according to an embodiment of the present invention will be described in detail with reference to the drawings. The rear suspension structure 10 is a so-called dodion suspension and is disposed at the rear end of the vehicle. As shown in FIG. 1, a rear suspension structure 10 includes a drive shaft 14 for transmitting driving force to left and right wheels (rear wheels), and an axle beam 16 provided separately from the drive shaft 14 and supporting the wheels. It has. Brake drums 24 are connected to both ends of the drive shaft 14.

  As shown in FIGS. 1 and 2, the axle beam 16 has both end portions 18 that are substantially linear, but has a curved portion 20 that is curved with respect to both end portions 18 at a substantially central portion in the axial direction. The axle beam 16 is disposed on the vehicle rear end side with respect to the axial position of the drive shaft 14 and is disposed below the drive shaft 14. The axle beam 16 is attached such that both end portions 18 are substantially parallel to the axial direction of the drive shaft 14 and the curved portion 20 bulges toward the vehicle rear side. Thereby, the axle beam 16 is installed without buffering with the differential device 22.

  A brake tube 30 taken out from the vehicle side is routed on the axle beam 16 described above. The brake tube 30 is branched at a position unevenly distributed on one end side in the longitudinal direction of the axle beam 16 (right side in the present embodiment) so that each reaches the brake drum 24 provided at both ends of the axle beam 16. It has been routed.

  The brake tube 30 is routed at a position where it is possible to prevent an excessively large impact from being applied due to a collision with the vehicle from the rear or a collision with a stone or the like that is wound up by wheels and scattered from the front to the rear. Yes. That is, the outer peripheral surface of the axle beam 16 is a region (rear collision safety region α) in which an excessively large impact is not expected even if an impact is applied from the rear of the vehicle, and stones and the like scattered from the front are also present. The brake tube 30 is routed in a region (stepping stone safety region β) where the possibility of a collision is extremely low. In other words, the brake tube 30 is routed in the rear collision safety area α except for the area (stone falling area γ) where it is assumed that there is a high possibility that stones wound up by the wheels will collide. Area (routing area δ).

  More specifically, as shown in FIG. 3, the axle beam 16 is viewed in cross-section and passes through the rear end position vertical surface 50 that makes surface contact with the axle beam on the vehicle rear end side, and the axial center position of the axle beam. When assuming an axial center position vertical surface 52 and an inclined surface 54 that passes through the axial center position of the axle beam and is inclined by a predetermined angle toward the front side of the vehicle, the rear collision safety region α and the stepping stone described above by these surfaces are assumed. A safety area β and a stepping stone danger area γ can be defined. The inclination angle θ of the inclined surface 54 can be appropriately set in consideration of the distance between the front wheel of the vehicle and the axle beam 16, the arrangement and size of the structure existing between the front wheel and the axle beam 16, and the like. It is. In the present embodiment, the inclination angle θ is set to 45 degrees.

  That is, the area on the vehicle front side with respect to the rear end position vertical surface 50 corresponds to the rear collision safety area α. Further, a region on the vehicle rear end side with respect to the axial center position vertical surface 52 or a region on the vehicle front side with respect to the axial center position vertical surface 52 and above the inclined surface 54 corresponds to the stepping stone safety region β. . On the contrary, a region below the inclined surface 54 and ahead of the vehicle with respect to the axial center position vertical surface 52 corresponds to a stepping stone danger region γ.

  In the rear suspension structure 10 of the present embodiment, the brake tube 30 passes through a region (routing region δ) ahead of the rear end position vertical plane 50 that forms the rearmost end of the axle beam 16 and above the axle beam 16. So that it is routed. Thus, the brake tube 30 avoids the stepping stone danger region γ, and the brake tube 30 is routed in the wiring region δ corresponding to the rear collision safety region α and the stepping stone safety region β. Therefore, according to the rear suspension structure 10, the brake tube 30 is damaged or broken by an impact caused by a collision from the rear of the vehicle or an impact caused by scattering of stones wound up by wheels or the like. It is possible to prevent it reliably.

  In the present embodiment, an example in which the cross-sectional shape of the axle beam 16 is substantially circular has been illustrated, but the present invention is not limited to this, and may be an ellipse or a rectangle. When the axle beam 16 has a cross-sectional shape other than a circle in this way, a circumscribed circle of the axle beam 16 is assumed, and the rear end position vertical plane 50 and the axial center position vertical plane 52 are based on the circumscribed circle. And the inclined surface 54 may be set, and the rear impact safety region α, the stepping stone safety region β, the stepping stone danger region γ, and the routing region δ may be defined based on these surfaces.

  In addition, the axle beam 16 illustrated in the present embodiment has a shape having the curved portion 20, but the present invention is not limited to this, and may be configured by a beam extending in a substantially linear shape. good.

  Further, as described above, the rear suspension structure 10 can prevent the brake tube 30 from being damaged or broken. Therefore, it is possible to employ a configuration in which the brake tube 30 is routed without being branched in advance on the vehicle body side and branched for the first time in the vicinity of the rear suspension structure 10. Thereby, the number of fixing points used for fixing the brake tube 30 and the fixing point of the brake tube 30 in the upstream side of the vicinity of the rear suspension structure 10, that is, the vehicle main body side, and the fixing member used for fixing the brake tube 30 are minimized. Is possible.

  Further, according to the rear suspension structure 10, the fixing point of the brake tube 30 can be suppressed, so that the number of parts and the weight of the vehicle as a whole can be reduced and the weight can be reduced. It becomes possible. Moreover, since it is not necessary to branch the brake tube 30 on the vehicle main body side, it is possible to easily perform the installation and maintenance work of the brake tube for the vehicle.

  The rear suspension structure of the present invention can be suitably used as a member for constituting a vehicle. According to the present invention, the brake tube taken out from the vehicle main body side can be branched and routed in the vicinity of the rear suspension structure.

DESCRIPTION OF SYMBOLS 10 Rear suspension structure 14 Drive shaft 16 Axle beam 18 End part 20 Curved part 30 Brake tube 50 Rear end position vertical surface 52 Axial center position vertical surface 54 Inclined surface α Rear collision safety region β Stepping stone safety region γ Stepping stone danger region δ Arrangement Search area

Claims (1)

An axle beam that supports the left and right wheels at the rear end of the vehicle;
A dodion-type rear suspension structure having a drive shaft for transmitting driving force to the wheels,
The brake tube branched at a position unevenly distributed on one end side in the longitudinal direction of the axle beam is routed so as to reach both end portions of the axle beam,
A part or all of the axle beam is located on the vehicle rear end side with respect to the axial center position of the drive shaft,
A cross-sectional view of the axle beam, a rear end position vertical surface that is in surface contact with the axle beam on the vehicle rear end side, an axial center position vertical surface that passes through the axial center position of the axle beam, and the axle beam When assuming an inclined surface that passes through the axial center position and is inclined by a predetermined angle toward the vehicle front side, the vehicle front side from the rear end position vertical surface and the vehicle rear end side from the shaft center position vertical surface The rear suspension structure is characterized in that the brake tube is routed so as to pass through this region, or a region on the front side of the vehicle and above the inclined surface with respect to the vertical axis surface.

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