JPH0720448U - Cooling structure of fluid for torque converter in vehicle - Google Patents

Abstract

(57) [Summary] [Configuration] A torque converter 4 for transmitting the output of the engine 2 to the transmission 3 and a propeller shaft 6 for transmitting the output of the transmission 3 to the differential device 5 are provided. A cooling fan 11 is attached to the propeller shaft 6 so as to rotate together. The cooling fan 11
The rotation of generates a flow of cooling air around the cases 3a and 4a that cover the transmission 3 and the torque converter 4. [Effect] The torque converter fluid can be cooled with a simple structure, and the cooler can be downsized by using it together with the cooler.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a cooling structure for a torque converter fluid in a vehicle including a torque converter that transmits an engine output to a transmission.

[0002]

[Prior art]

 Conventionally, the torque converter fluid that transmits the engine output to a hydraulic automatic transmission in a vehicle travels from the pump of the torque converter to the stator via the turbine, and after flowing out of this stator, reaches the cooler such as a radiator via an oil pan. It is cooled and then used as working fluid and lubricating oil for the speed change gear mechanism and forward / reverse switching hydraulic clutch, etc. that make up the transmission, so it is re-pumped via the fluid pressure control circuit in the transmission case. Will be introduced to.

[0003]

[Problems to be solved by the device]

 Since the fluid of the torque converter becomes extremely hot, the size of the cooler will increase if it is cooled sufficiently.

Therefore, an object of the present invention is to provide a cooling structure that can cool a torque converter fluid in a vehicle with a simple structure and can be used together with a conventional cooler.

[0005]

[Means for Solving the Problems]

 The cooling structure for a torque converter fluid in a vehicle of the present invention is a vehicle equipped with a torque converter for transmitting an engine output to a transmission and a propeller shaft for transmitting the output of the transmission to a differential device. The fan is mounted so as to rotate together, and the rotation of the cooling fan generates a flow of cooling air around the case that covers the transmission and the torque converter.

[0006]

[Action]

 According to the configuration of the present invention, the cooling fan rotates together with the propeller shaft to generate a flow of cooling air around the case that covers the torque converter and the transmission, so that the torque converter fluid flowing in the case is cooled. be able to.

[0007]

【Example】

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

FIGS. 1 and 2 show a power transmission system of an industrial vehicle such as a forklift truck. An engine 2 supported by a frame 1 constituting a vehicle body and an output of the engine 2 are transmitted to an automatic transmission 3 via a fluid. A torque converter 4 for transmitting and a propeller shaft 6 for transmitting the output of the transmission 3 to a differential device 5 are provided. The transmission 3 may be a known one including a speed change gear mechanism and a forward / reverse switching hydraulic clutch that are operated and controlled by a fluid pressure control circuit using a torque converter fluid as a working fluid. As the torque converter 4, a known one having a pump, a turbine and a stator can be used, and the torque converter fluid reaches the stator from the pump via the turbine, and the radiator from the stator via the oil pan 9. It is cooled to the cooler 10 and is again introduced into the pump from the cooler 10 via the fluid pressure control circuit in the transmission case 3a. The case 3a that covers the transmission 3 and the case 4a that covers the torque converter 4 are arranged in series. The differential 5 decelerates the rotation of the propeller shaft 6 by a final reduction gear and transmits the driving force from the differential gear to the wheels 8 via the axle 7.

A cooling fan 11 is attached to the propeller shaft 6 so as to rotate together. As a result, the cooling fan 11 rotates together with the propeller shaft 6 to generate a flow of cooling air. The direction of the flow of the cooling air is opposite to that of the propeller shaft 6 when the vehicle is moving forward and when the vehicle is moving backward. Therefore, when the vehicle is moving forward, as shown by arrow A in FIG. 3, toward the torque converter 4, and when traveling in reverse, as shown by the arrow B in FIG. 2, from the torque converter 4 and the transmission 3 toward the cooling fan 11, and in any case, the transmission case 3a and the torque converter case 4a. A flow of cooling air is generated around the.

According to the above configuration, the cooling fan 11 rotates together with the propeller shaft 6 to generate a cooling air flow around the transmission case 3a and the torque converter case 4a. Therefore, the cooling air flows in the cases 3a and 4a. The torque converter fluid can be cooled, and the cooler 10 can be downsized. In an ordinary industrial vehicle or the like, the loss of the engine output due to the driving of the cooling fan 11 is small, and the engine speed is decelerated by the transmission 3. Therefore, the heat generated in the transmission 3 by the driving resistance of the cooling fan 11 is slight. It does not affect the cooling of the torque converter fluid.

It should be noted that the present invention is not limited to the above-described embodiment, and for example, the flow direction of the cooling air when the vehicle is moving forward and when the vehicle is moving backward may be opposite to that of the above-described embodiment. Further, fins may be provided on the transmission case 3a and the torque converter case 4a.

[0012]

[Effect of device]

 According to the present invention, the torque converter fluid can be cooled with a simple structure, and the cooler can be downsized by using it together with the cooler.

[Brief description of drawings]

FIG. 1 is a side view of a torque converter fluid cooling structure according to an embodiment of the present invention.

FIG. 2 is a plan view of a torque converter fluid cooling structure according to an embodiment of the present invention.

[Explanation of symbols]

 2 engine 3 transmission 3a transmission case 4 torque converter 4a torque converter case 5 differential device 6 propeller shaft 11 cooling fan

Claims (1)

[Scope of utility model registration request] 1. In a vehicle including a torque converter for transmitting an engine output to a transmission and a propeller shaft for transmitting an output of the transmission to a differential device, a cooling fan is attached to the propeller shaft so as to rotate together. A cooling structure for a torque converter fluid in a vehicle, wherein a flow of cooling air is generated around a case that covers a transmission and a torque converter by rotation of a cooling fan.