Machine element or mechanism – Gearing – With fluid drive
Reexamination Certificate
1999-10-01
2001-08-07
Estremsky, Sherry (Department: 3681)
Machine element or mechanism
Gearing
With fluid drive
C475S078000
Reexamination Certificate
active
06269713
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a vehicle with an auxiliary traveling device.
2. Description of the Related Art
Normal vehicle may run at a high speed higher than or equal to 100 km/h. However, it is typical that the vehicle is not provided a primary power transmission having a power transmission ratio permitting to run at inching speed in the extent lower than 5 km/h when a prime mover for traveling is a high revolution speed and high output.
Accordingly, in case of a vehicle specialized for parade or a working vehicle which is required inching with a traveling prime mover of high revolution speed and high output, a power transmission which has different power transmission ratio other than that of a power transmission of the normal vehicle has to be installed. On the other hand, the vehicle having such power transmission other than the power transmission of the normal vehicle, normally does not have performance for high speed traveling unless it is a special vehicle which has a power transmission with sixteen stages of speed ratio, or so forth. Therefore, such vehicle has to be transported to a destination by a transporter or the like.
On the other hand, the normal vehicle installed with an external power takeoff cannot simultaneously drive the external power takeoff during normal traveling by the primary prime mover or simultaneously drive the vehicle for normal traveling by the primary prime mover while the external power takeoff is in operation, forcedly.
Various working vehicles, such as so-called vacuum type suction cleaner vehicle, may travel to a destination, namely a working site, at high speed similarly to the normal vehicle. However, such working vehicle is not able to run at inching speed required for cleaning operation while predetermined suction cleaning operation is performed using the external power takeoff at the working site.
Accordingly, when it is required to drive the vehicle at inching speed during suction cleaning operation, it is inherent to install a dedicated prime mover separately from the traveling prime mover for using as driving source in suction cleaning operation.
However, in practice, a special vehicle in which is installed a multi-speed power transmission permitting continuous traveling at inching speed in the extent lower than 5 km/h is installed, and also achieving normal high speed traveling performance, with the traveling prime mover of high revolution speed and high output, is quite expensive.
On the other hand, installation of the prime mover dedicated for inching travel, namely the working prime mover separately from the traveling prime mover inherently increase production cost and is disadvantageous in viewpoint of weight and installation space.
SUMMARY OF THE INVENTION
The present invention has been worked out in view of drawbacks in the prior art as set forth above. Therefore, it is an object of the present invention to provide a vehicle which can achieve high speed traveling performance as achieved by a normal vehicle, and can be continuously driven at inching speed in the extent of lower than 5 km/h with a traveling prime mover of high revolution speed and high output at a destination.
According to the first aspect of the present invention, a vehicle with an auxiliary traveling device comprises:
a power train including a primary power transmission for normal traveling, which is connected to a prime mover for normal traveling, for transmitting a rotational torque of the traveling prime mover to driving wheels, through a rotary power transmission shaft, a drive shaft speed reducer and drive shaft;
an external power takeoff mechanism incorporated in the primary power transmission;
a hydraulic pressure generator connected to an external power takeoff shaft of the external power takeoff mechanism;
a hydraulically controlled power transmission for inching travel, which includes a hydraulic motor connected to the hydraulic pressure generator;
the power train being active for enabling the vehicle to travel at a normal traveling speed while the primary power transmission for normal traveling is placed at a range position other than neutral range position,
the auxiliary traveling device being operated for enabling travel at inching speed when the primary power transmission for normal traveling is placed at neutral range position, and
when the primary power transmission for normal traveling is shifted out of the neutral range position, the external power takeoff mechanism and the hydraulically controlled power transmission for inching travel being made inoperative instantly in response to an electrical signal from a neutral position detector incorporated in the primary power transmission for normal traveling.
According to the second aspect of the present invention, a vehicle with an auxiliary traveling device which travels at a normal traveling speed by transmitting a rotational torque of a traveling prime mover to driving wheels via a rotary power transmission shaft, a drive shaft speed reducer and a drive shaft while a normal traveling primary power transmission is in a range other than a neutral range, and performs a required work by transmitting the rotational torque of the traveling prime mover to an external work implement via an external power takeoff mechanism when the normal traveling primary power transmission is in the neutral range, comprises:
the auxiliary traveling device being formed by connecting a hydraulic pressure generator to an external power takeoff shaft of the external power takeoff mechanism to be driven by the rotational torque of the traveling prime mover, and connecting a hydraulically controlled power transmission for inching travel to the rotary power transmission shaft, the hydraulically controlled power transmission for inching travel incorporating a hydraulic motor connected to the hydraulic pressure generator;
the auxiliary traveling device being operated for enabling travel at inching speed in conjunction with operation of the external work implement when the primary power transmission for normal traveling is placed at neutral range position, and
when the primary power transmission for normal traveling is shifted out of the neutral range position, the external power takeoff mechanism and the hydraulically controlled power transmission for traveling at inching speed being made inoperative instantly in response to an electrical signal from a neutral position detector incorporated in the primary power transmission for normal traveling.
According to the third aspect of the present invention, the vehicle with an auxiliary traveling device comprises:
a power train mechanism driving the vehicle to travel at a normal traveling speed by transmitting a rotational torque of a traveling prime mover to driving wheels via a rotary power transmission shaft, a drive shaft speed reducer and a drive shaft while a normal traveling primary power transmission is in a range other than a neutral range, and to transmit a rotational torque of the traveling prime mover to an external work implement via an external power takeoff mechanism for implementing a required work when the normal traveling primary power transmission is in the neutral range;
the auxiliary traveling device being formed by connecting a hydraulic pressure generator to an external power takeoff shaft of the external power takeoff mechanism to be driven by the rotational torque of the traveling prime mover, and connecting a hydraulically controlled power transmission for traveling at inching speed to the rotary power transmission shaft, the hydraulically controlled power transmission for traveling at inching speed incorporating a hydraulic motor connected to the hydraulic pressure generator;
the auxiliary traveling device being operated for enabling travel at inching speed in conjunction with operation of the external work implement when the primary power transmission for normal traveling is placed at neutral range position, and
when the primary power transmission for normal traveling is shifted out of the neutr
Estremsky Sherry
Projet Company Limited
Sughrue Mion Zinn Macpeak & Seas, PLLC
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