JP2019206274A - De dion type suspension device of vehicle - Google Patents

Abstract

To provide a De Dion type suspension device of a vehicle capable of responding to requests of cost reduction, and stable and safe executing of jack-up.SOLUTION: In a De Dion type suspension device 1 including a pair of saddles 14a, 14b storing a part of drive shafts 6a, 6b, and connected to elastic bodies 16a, 16b for suspending the body of a vehicle, and an axle pipe 18 for supporting a pair of wheels 8a, 8b by connecting the pair of saddles 14a, 14b, a jack-up point is formed by providing a recess 30 on a surface 14x on the road surface side of the saddles 14a, 14b.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a dodion-type suspension device for a vehicle, and more particularly to a dodion-type suspension device suitable for an electric commercial vehicle.

  Conventionally, in the field of passenger cars, it is known to use, for example, a dodion type suspension device as a suspension device for an electric vehicle (see, for example, Patent Document 1). By applying such a suspension device, the unsprung weight can be made lighter than the axle type, so that the steering stability of the vehicle can be improved.

JP 2000-25440 A

  In recent years, in the field of commercial vehicles such as trucks, electric commercial vehicles such as electric trucks not equipped with an internal combustion engine have been developed from the viewpoint of reducing environmental impact, and electric vehicles using a dodion type suspension system have been studied. ing.

  In such a vehicle, it is necessary to cope with jack-up as in a normal vehicle. However, in providing a jack-up point, the cost can be reduced by reducing the number of parts and the jack-up can be stably and safely performed. There is a request for that.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a vehicle dodion-type suspension that can meet the demand for cost reduction and stable and safe jack-up.

The present invention can be realized as the following application examples.
The vehicle dodion type suspension according to this application example includes a differential to which a driving force of a motor mounted on the vehicle is transmitted, a pair of drive shafts that transmit the driving force transmitted to the differential to a pair of wheels, and A dodion-type suspension device for a vehicle comprising: a pair of saddles that house a part of a drive shaft and that are connected to an elastic body that suspends the vehicle body of the vehicle; A jack-up point is formed by a recess provided on the road surface side surface of the saddle.

  With the same configuration, for example, when jack-up is required due to tire replacement, etc., the jack device is installed on the road surface immediately below the saddle, the jack device is operated in the lifting direction, and the receiving portion of the jack device is fitted in the recess, Continue to move upward. As a result, an upward force is applied to the saddle, the saddle is lifted, and the vehicle body is jacked up.

  Thus, since the jack-up point is formed on the saddle having high rigidity and strength, the jack-up of the vehicle can be safely performed in a stable posture. In addition, since the jack-up point is simply provided with a recess in the saddle, no additional parts are required. That is, the jack-up point can be formed while reducing the number of parts, and is excellent in cost reduction.

  Therefore, it is possible to meet the demand for cost reduction and stable and safe jack-up.

The top view which shows the outline of the dodion type suspension apparatus which concerns on one Embodiment of this invention. Sectional drawing of the axle structure of FIG. Sectional drawing seen from the arrow AA direction in FIG. The perspective view seen from the arrow b direction in FIG.

Hereinafter, the present invention will be described based on an embodiment shown in FIGS.
1 shows a top view showing an outline of a dodion type suspension device, FIG. 2 shows a plane cross section of an axle structure constituting the suspension device, FIG. 3 shows a side surface along the line AA in FIG. 4 shows the lower surface seen from the arrow B in FIG.

  The dodion type suspension device 1 (hereinafter also simply referred to as a suspension device) is employed in a rear suspension provided at the rear of an electric commercial vehicle (hereinafter also referred to as a vehicle) such as an electric truck, for example.

  First, each part of the vehicle will be schematically described. As shown in FIG. 1, the vehicle is mounted with a motor 2 as a travel drive source and a power transmission mechanism 4 provided integrally with the motor 2. The power transmission mechanism 4 includes a speed reducer 4a composed of a plurality of speed reduction gears that decelerate the output (rotation) of the motor 2 and a differential 4b connected to the speed reducer 4a.

  That is, the driving force of the motor 2 is transmitted to the differential 4b. Further, the driving force is applied to the left and right wheels via a pair of drive shafts 6a and 6b extending from the differential 4b to the left and right sides (vehicle width direction X), spindles 12a and 12b at the ends of the drive shafts 6a and 6b, and hubs 20a and 20b. 8a and 8b are transmitted. Incidentally, flexible joints 22a and 22b (FIG. 1) and flexible joints 60a and 60b (FIG. 2) are interposed at both ends of the drive shafts 6a and 6b.

  The motor 2 and the power transmission mechanism 4 are supported by a cross member (not shown) constituting the chassis frame 10 of the vehicle, for example, and side rails 10a and 10b on the vehicle body side.

On the other hand, as shown in FIGS. 1 and 3, the wheels 8 a and 8 b are supported by the suspension device 1 on side rails 10 a and 10 b extending in the vehicle longitudinal direction Y.
The suspension device 1 includes a pair of saddles 14a and 14b, a pair of leaf springs 16a and 16b (corresponding to the elastic body of the present application), an axle pipe 18 and the like.

  That is, the saddles 14a and 14b are formed of a pair of rectangular cross-section (square) hollow members to which the inner ends of the spindles 12a and 12b in the vehicle width direction X are joined. Each of the saddles 14a and 14b communicates internally with the spindles 12a and 12b, and accommodates the flexible joints 60a and 60b on the end side (part) of the drive shafts 6a and 6b and the tip side. And each saddle 14a, 14b is supported by each side rail 10a, 10b via leaf spring 16a, 16b.

  Specifically, the leaf springs 16a and 16b extend in the vehicle longitudinal direction Y as shown in FIGS. Each end of each leaf spring 16a, 16b is supported by each side rail 10a, 10b via a bracket (not shown). That is, the leaf springs 16a and 16b are assembled on the vehicle body side so as to be elastically displaceable in the vertical direction Z.

  As shown in FIGS. 3 and 4, the saddles 14a and 14b are arranged on the lower surfaces of the leaf springs 16a and 16b. Specifically, each of the saddles 14a and 14b is arranged in a posture in which a flat surface faces downward. Each saddle 14a, 14b is fixed to the lower part of each leaf spring 16a, 16b by a plurality of U bolts 15 as fasteners. As a result, the saddles 14a and 14b, the spindles 12a and 12b, the wheels 8a and 8b, and the like are suspended from the vehicle body via the leaf springs 16a and 16b.

  On the other hand, the axle pipe 18 is linearly arranged along the vehicle width direction on the rear side of the power transmission mechanism 4 as shown in FIGS. 1 and 3. The axle pipe 18 is composed of a hollow cylindrical member. The opening ends at both ends of the axle pipe 18 are joined (connected) via, for example, saddles 14a and 14b via relay cylinder portions 23a and 23b extending while being curved in the vehicle width direction to form an axle structure 28. ing.

  Although not shown, the axle pipe 18 is supported by the side rails 10a and 10b via shock absorbers attached to the saddles 14a and 14b. I support it. The unsprung weight of the suspension device 1 is suppressed by this torsional support.

  Since the saddles 14a and 14b constituting the suspension device 1 are required to withstand the load in the vertical direction applied from the wheels 8a and 8b, the saddles 14a and 14b have high rigidity and strength.

  By utilizing this characteristic, as shown in FIGS. 3 and 4, jack-up points P are formed on the saddles 14a and 14b. More specifically, the jack-up point P is formed on a flat lower surface 14x which is a surface on the road surface side of each saddle 14a, 14b.

  The jack-up point here refers to a place where a cradle (not shown), which is the head part of the jack device, is assembled when lifting the vehicle body using a jack device (not shown), for example, for tire replacement. Say.

In the present embodiment, it is assumed that the jack device uses a disk-shaped cradle.
Therefore, as shown in FIGS. 3 and 4, a circular recess 30 into which the cradle of the jack device can be inserted is formed on the lower surface 14x of the saddles 14a and 14b. The recessed part 30 is provided in the point which does not overlap with the opening part 31 provided in the lower surface 14x of saddle 14a, 14b for draining, for example. Thus, when it is required to lift the rear side of the vehicle body, the vehicle body is lifted using the recess 30 as a jack-up point.

Next, the operation of the suspension device 1 configured as described above will be described.
For example, it is assumed that jack-up is required on the rear side of the vehicle body due to tire replacement.

  At this time, for example, a jack device (not shown) is installed on the road surface immediately below the recess 30 of the saddle 14a on one side. Next, the jack device is operated to raise the cradle (not shown) of the jack device, and the receiving portion is fitted into the recess. Subsequently, when the jack device is operated in the lifting direction, an upward force is applied to the saddle 14a, and the saddle 14a is lifted. Thereby, the vehicle body is jacked up.

  As described above, with the structure in which the recesses 30 are formed in the saddles 14a and 14b as the jack-up point as in the present embodiment, the jack-up on the rear side is performed in the saddles 14a and 14b having high rigidity and strength. It can be done safely in a posture. Moreover, since the jack-up point is only provided with the recess 30 in the saddles 14a and 14b, it is not necessary to separately provide parts. That is, the jack-up point can be formed while reducing the number of parts, and is excellent in cost reduction.

Therefore, it is possible to meet the demand for cost reduction and stable and safe jack-up.
Note that the present invention is not limited to the above-described embodiment, and various modifications may be made without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 1 Dodion type suspension apparatus 2 Motor 4b Differential 6a, 6b Drive shaft 8a, 8b Wheel 14a, 14b Saddle 16a, 16b Leaf spring (elastic body)
18 Axle pipe 30 Recess (Jack-up point)

Claims (1)

A dodion-type suspension apparatus for a vehicle comprising: a differential that transmits a driving force of a motor mounted on a vehicle; and a pair of drive shafts that transmit the driving force transmitted to the differential to a pair of wheels, respectively. ,
A pair of saddles that house part of the drive shaft and are connected to an elastic body that suspends the vehicle body of the vehicle;
An axle pipe that supports the pair of wheels by connecting the pair of saddles, and
A dodion type suspension system for a vehicle, wherein a jack-up point is formed by a concave portion provided on a road surface side surface of the saddle.

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