JPS633526Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an engine accessory drive device for a large bus.

In recent years, large tour buses have become more deluxe, equipped with various electrical components such as microwave ovens and refrigerators, and attempts have been made to improve the performance of air-conditioning systems, resulting in the need for large power generators and air-conditioning systems.

As a result, generators and air-conditioning compressors have also become larger, and various auxiliary equipment such as compressors are now driven by a crankshaft pulley installed at the front of the engine (at the rear end when viewed from the vehicle) via a V-belt, as in the past. It was difficult to install the engine compartment because the passenger space had to be made as wide as possible, and the engine compartment had to be placed as far back as possible in the vehicle.

Therefore, conventionally, the auxiliary engine for driving the cooling compressor and the condensing unit such as the compressor were housed in a space on the lower side of the vehicle body.

However, because of this condensing unit,
The space that can be used as a trunk room in the lower part of the vehicle body becomes narrower, which becomes a major obstacle in meeting the demands of users who want to secure as much trunk room as possible.Additionally, installing a separate auxiliary engine causes problems such as increased weight and production costs. It was hot.

This invention is located at the rear of the main engine (front as seen from the vehicle).
The purpose of the present invention is to solve the above problem by installing a power extraction device in the air conditioner and driving a cooling compressor, generator, etc.

In order to achieve the above object, the present invention is designed so that the transmission means for transmitting the power taken out from the end of the crankshaft protruding toward the front side of the engine to the radiator fan etc. is located on the rear side of the vehicle body, so that the engine compartment is located under the floor of the vehicle body. In a large bus in which an engine is installed, a power take-off shaft that is rotationally driven based on power from the crankshaft is provided protruding from the rear side of the engine, and the power take-off shaft is located on the rear side of the engine, to the side of the power take-off shaft, and to the vehicle body. A cooling compressor is provided under the floor, and driving force from the power take-off shaft is transmitted to the cooling compressor via a second transmission means.

Embodiments of the present invention will be described below with reference to the accompanying drawings.

As shown in FIGS. 1 and 2, an engine 1 is housed in an engine room B located at the rear under the floor of a large bus A. Engine 1 is its front 1A
is mounted so as to face the rear side of the vehicle body, and a pulley 3 and a V-belt 4 as a transmission means are attached to the end of the crankshaft 2 protruding from the front surface 1A. The water pump 5 and the radiator fan 20 are driven by the engine power.

On the other hand, the rear side 1B of the engine 1 facing the front of the vehicle
A power take-off shaft 6 (hereinafter referred to as a PTO shaft) that receives power from the crankshaft 2 is protrudingly provided, and a generator 7 is driven by the rotational force of the PTO shaft 6.
Similarly, a cooling compressor 8, pulleys 9, 10, 11 and a V-belt 12 as a second transmission means for transmitting power from the PTO shaft 6 to the generator 7 and compressor 8 are arranged on the engine rear surface 1B side under the floor of the vehicle body. will be established. In addition, 2 in the figure
1 is transmission.

According to the above configuration, the cooling compressor 8 is directly driven by the power of the engine 1, and is connected to a condensing unit such as a condenser or a heat dissipation fan, or a cooling unit such as an evaporator or blower disposed elsewhere in the vehicle body. The interior of the vehicle can be stably cooled through this system.

On the other hand, various auxiliary machines of the engine 1 can also be arranged in the same manner as in the past via the crankshaft pulley 2 and the V-belt 4 on the front side of the engine 1A.

In this way, with the configuration in which the PTO shaft 6 is protruded from the rear side of the engine 1 to drive the compressor 8, etc., it is possible to provide auxiliary equipment in a rational layout. This prevents the auxiliary machinery from concentrating on the sides and, as a result, expanding the engine room forward. Needless to say, there is no need to provide an auxiliary engine to drive the compressor 8.

As described above, in this invention, by arranging the cooling compressor so that it is driven by the PTO shaft at the rear of the engine, the conventional auxiliary engine can be eliminated, resulting in a reduction in vehicle weight and production costs. This has the effect of increasing the trunk space.

[Brief explanation of drawings]

FIG. 1 is a side view showing an embodiment of the present invention, and FIG. 2 is a plan view showing an embodiment of the present invention. 1... Engine, 2... Crankshaft, 6... Power take-off shaft, 8... Cooling compressor.

Claims (1)

[Scope of utility model registration request] In large buses, the engine is housed in the engine compartment under the floor of the vehicle so that the transmission means for transmitting the power extracted from the end of the crankshaft protruding toward the front of the engine to the radiator fan, etc., is located at the rear of the vehicle body. A power take-off shaft that is rotationally driven based on the power from the shaft is installed protruding from the rear of the engine, and
A cooling compressor is provided on the rear side of the engine, to the side of the power take-off shaft, and under the floor of the vehicle body.
An engine auxiliary machinery drive device characterized in that driving force from a power take-off shaft is transmitted through a transmission means.