JP2014139049A - Rear dead axle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce an air tank.SOLUTION: A rear dead axle 5 does not transmit a driving force to a rear wheel. The rear dead axle 5 includes: a cylindrical axle housing 11; cylindrical spindles 16 which are welded to entire peripheries of both ends of the axle housing 11; lid parts 18, each of which is welded to an entire periphery of the spindle 16 and seals an internal space A of the axle housing 11 and the spindle 16; and an output port part 13 and an input port part 14 which communicate with the internal space A of the axle housing 11.

Description

  The present invention relates to a structure of a rear dead axle that does not transmit driving force to a rear wheel.

  In general, a large truck employs a triaxial vehicle having a front wheel axle as one axis and a rear wheel axle as two axes. Such three-axle large trucks include a 6 × 4 system that uses two rear wheel axles as a drive shaft, and a 6 × 2 system that uses only one rear wheel axle as a drive shaft. There is. In the 6 × 2 type large truck, the rear wheel axle disposed on the front side of the two rear wheel axles is a rear drive axle (drive shaft) that transmits the driving force to the rear wheels. The rear wheel axle disposed on the rear side is a rear dead axle (driven shaft) that does not transmit driving force to the rear wheels.

  In such a 6 × 2 large truck, in order to ensure startability under slippery conditions, a drive shaft weight increasing device that moves part of the driven shaft weight to the drive shaft by an air spring is considered. (For example, refer to Patent Document 1).

JP-A-10-166833

  Such a drive shaft weight increasing device is provided with a pneumatic device such as an air spring that operates by air pressure, and operates by adjusting the air pressure of the pneumatic device. For this reason, the large truck needs to be provided with an air tank for storing air to be supplied to the pneumatic equipment. Moreover, since a large truck is equipped with various pneumatic devices in addition to the drive shaft weight increasing device, it is necessary to provide many air tanks.

  However, the air tank occupies a large space and causes an increase in weight and cost.

  Therefore, the present inventors went beyond the common sense in the technical field of air tanks, focused on the rear dead axle that has nothing to do with the air tank, and conducted earnest research on whether the air tank could be reduced by the rear dead axle.

  That is, an object of the present invention is to provide a rear dead axle that can reduce the number of air tanks.

  A rear dead axle according to the present invention is a rear dead axle that does not transmit a driving force to a rear wheel, and communicates with a cylindrical axle housing, a lid that seals the inner space of the axle housing, and an inner space of the axle housing. A port portion.

  According to the rear dead axle according to the present invention, since the inner space of the axle housing is sealed by the lid portion, the air spring is operated by air pressure by taking air in and out of the inner space of the axle housing through the port portion. The air used for pneumatic equipment such as can be stored in the internal space of the axle housing. As a result, the rear dead axle can function as an air tank, so that the number of air tanks can be reduced. Furthermore, the rear dead axle is not required to have extremely high rigidity like a vehicle body frame, and is only required to support the rear wheel and the cargo bed. For this reason, it is possible to secure a sufficient capacity as an air tank while suppressing the complexity of the structure.

  In this case, a cylindrical hub mounting spindle can be hermetically welded to both ends of the axle housing, and a lid can be hermetically welded to the hub mounting spindle.

  In this way, the hub mounting spindle is hermetically welded to both ends of the axle housing, and the lid is hermetically welded to the hub mounting spindle, so that the inner space of the axle housing and the hub mounting spindle are Since the internal space can be sealed as one internal space, the capacity of air that can be stored in the rear dead axle can be increased while maintaining the function as an air tank.

  Moreover, it is preferable that a port part is provided in the center part in the vehicle up-down direction of an axle housing.

  The rear dead axle bends in the vertical direction of the vehicle, but the maximum stress acting on the port when the rear dead axle is bent in the vertical direction of the vehicle is formed by forming the port portion at the center of the axle housing in the vertical direction of the vehicle. Can be reduced.

  According to the present invention, since the function of the air tank can be given to the rear dead axle, the air tank can be reduced.

1 is a schematic plan view of a vehicle provided with a rear dead axle according to an embodiment. 1 is a schematic plan view of a rear dead axle according to an embodiment.

  DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. In the following description, the same or corresponding elements are denoted by the same reference numerals, and redundant description is omitted.

  FIG. 1 is a schematic plan view of a vehicle provided with a rear dead axle according to an embodiment. As shown in FIG. 1, the vehicle 1 is a 6 × 2 large truck. The vehicle 1 includes a cabin 2 on which an engine is loaded, and a vehicle body frame 3 extending rearward from the cabin 2. The vehicle body frame 3 includes a single front wheel axle and a two rear wheel axle. It is supported. Of the two rear wheel axles, the rear wheel axle disposed on the front side is a rear drive axle 4 serving as a drive shaft for transmitting driving force to the rear wheels, and the rear wheel axle disposed on the rear side is The rear dead axle 5 is a driven shaft that does not transmit driving force to the rear wheels. The vehicle body frame 3 also supports a battery 6, a fuel tank 7, an air tank 8, and the like.

  FIG. 2 is a schematic plan view of the rear dead axle according to the embodiment. In FIG. 2, an alternate long and short dash line C indicates a center line passing through the center of the vehicle 1 in the vehicle width direction. As shown in FIG. 2, the rear dead axle 5 according to this embodiment includes an axle housing 11 that extends in the vehicle width direction.

  The axle housing 11 is formed in a cylindrical shape, and an internal space A in which air accumulates is formed inside the axle housing 11. In addition, the cylinder shape of the axle housing 11 is not specifically limited, For example, it can be set as a cylinder shape, a square cylinder shape, etc.

  A bracket 12 for attaching an air suspension (not shown) for suspending the vehicle body frame 3 is fixed to the axle housing 11. Further, the axle housing 11 is provided with an output port portion 13 and an input port portion 14 that are in communication with the internal space A in the vicinity of the bracket 12. The output port portion 13 is a port for supplying the air stored in the internal space A to a pneumatic device (not shown) such as an air spring that operates by air pressure. The input port unit 14 is a port for supplying compressed air from the air tank. The positions of the output port portion 13 and the input port portion 14 are not particularly limited, but are preferably provided at the center of the axle housing 11 in the vehicle vertical direction.

  A spindle 16 to which a hub 15 that rotatably supports a rear wheel is attached is connected to both ends of the axle housing 11, and a hub cap 17 is attached to the tip of the hub 15 so as to cover the spindle. The spindle 16 is formed in a cylindrical shape, and an internal space A in which air accumulates is formed inside the spindle 16. The internal space A of the spindle 16 is an integral space with the internal space A of the axle housing 11. The axle housing 11 and the spindle 16 are hermetically welded around the circumference so that air does not leak from between the axle housing 11 and the spindle 16.

  A lid 18 that seals the inner space A of the axle housing 11 and the spindle 16 is attached to the tip of the spindle 16. The lid portion 18 closes the opening of the spindle 16, and the spindle 16 and the lid portion 18 are hermetically welded around the circumference so that air does not leak from between the spindle 16 and the lid portion 18.

  And the output port part 13 and a pneumatic apparatus are connected with an air hose (not shown). Moreover, the input port part 14 and an air tank are connected with an air hose (not shown).

  If the rear dead axle 5 is configured in this manner, since the internal space A of the axle housing 11 is sealed by the lid portion 18, air is taken in and out from the internal space A via the output port portion 13 and the input port portion 14. Thus, the air used in the pneumatic device can be stored in the internal space A of the axle housing 11. Thereby, since the rear dead axle 5 can be functioned as an air tank, an air tank can be reduced. Further, the rear dead axle 5 is not required to have a U-shaped cross-section like the vehicle body frame 3 and has only a very high degree of freedom in shape as long as it can support the rear wheel and the loading platform. For this reason, it is possible to secure a sufficient capacity as an air tank while suppressing the complexity of the structure.

  Further, the spindle 16 is hermetically welded to both ends of the axle housing 11 and the inner space A of the axle housing 11 and the spindle 16 is hermetically sealed by airtightly welding the lid portion 18 to the spindle 16. Therefore, the capacity of air that can be stored in the rear dead axle can be increased while maintaining the function as an air tank.

  Further, by forming the output port portion 13 and the input port portion 14 at the center portion of the axle housing 11 in the vehicle vertical direction, the output port portion 13 and the input port portion when the rear dead axle 5 is bent in the vehicle vertical direction. The maximum stress acting on 14 can be reduced.

  Further, by providing the output port portion 13 in the vicinity of the bracket 12, the distance from the output port portion 13 to the air suspension fixed to the bracket 12 is shortened. For this reason, when air is supplied from the rear dead axle 5 to the air suspension, the air tube serving as the air supply path can be shortened, so that the pressure loss of the air pressure can be reduced.

  The preferred embodiment of the present invention has been described above, but the present invention is not limited to the above embodiment.

  For example, in the above-described embodiment, the inner space A of the axle housing 11 and the spindle 16 is described as functioning as an air tank. However, only the inner space A of the axle housing 11 may be functioned as an air tank. In this case, lids that seal the inner space A of the axle housing 11 may be attached to both ends of the axle housing 11. Further, a solid spindle may be connected to both ends of the axle housing 11, and this spindle may be used as a lid portion that seals the internal space A.

  Moreover, although the said embodiment demonstrated as what provided only one set of the output port part 13 and the input port part 14 in the axle housing 11, according to the number of the pneumatic equipments which use the rear dead axle 5, the number of sets is appropriate. Can be set.

  Further, in the above-described embodiment, the connection between the axle housing 11 and the spindle 16 and the connection between the spindle 16 and the lid portion 18 are described as being performed by all-around welding. If possible, the connection may be made by other means.

DESCRIPTION OF SYMBOLS 1 ... Vehicle, 2 ... Cabin, 3 ... Body frame, 4 ... Rear drive axle, 5 ... Rear dead axle, 6 ... Battery, 7 ... Fuel tank, 8 ... Air tank, 11 ... Axle housing, 12 ... Bracket, 13 ... Output Port part, 14 ... Input port part, 15 ... Hub, 16 ... Spindle (spindle for hub mounting), 17 ... Hub cap, 18 ... Cover part, A ... Internal space.

Claims (3)

A rear dead axle that does not transmit driving force to the rear wheels,
A tubular axle housing;
A lid for sealing the inner space of the axle housing;
A port portion communicating with the internal space of the axle housing;
A rear dead axle characterized by comprising: Cylindrical hub mounting spindles are hermetically welded to both ends of the axle housing,
The lid is hermetically welded to the hub mounting spindle.
The rear dead axle according to claim 1. The port portion is provided at a center portion of the axle housing in the vehicle vertical direction.
The rear dead axle according to claim 1 or 2.

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