CN1920318A - Cooling device for vehicle dry type two clutches - Google Patents

Abstract

An automobile dry-type dual-clutch cooling device, the device is provided with an air inlet (11) and an exhaust port (5) on the casing (2) of the dual-clutch automatic transmission, and is installed on the air inlet (11) The air blower (12) driven by the motor is provided with a guide tube (10) inside the transmission housing (2), and radial ventilation holes are opened on the flywheel disc (1) and the clutch cover (9) to form an air cooling system, and the cooling system is utilized to The air cools the clutch parts forcibly, lowering its working temperature, so as to solve the problem that the working performance and service life of the dry double clutch are affected by the high working temperature.

Description

Automobile dry double clutch cooling device

Technical field:

The invention relates to an automobile dry-type double-clutch cooling device, in particular to an air cooling device for a dry-type double-clutch in an automobile double-clutch automatic transmission.

Background technique:

Automobile dual-clutch automatic transmission (DCT) usually uses two clutches (dual clutches). The transmission gears are arranged separately according to odd and even numbers, and are respectively connected to the two clutches. One gear works and the other gear waits, and the gear shifting process is completed through the alternate switching of the two clutches. DCT combines the advantages of electromechanical automatic transmission (AMT) and hydromechanical automatic transmission (AT), and inherits many advantages of manual transmission, such as high transmission efficiency, compact installation space, light weight, and low price, and realizes uninterrupted power transmission. It not only ensures the acceleration of the car, but also greatly improves the comfort of the vehicle because it no longer produces the shock phenomenon caused by the shift. As one of the key components of the DCT automatic transmission, the dual clutch is responsible for the important functions of starting control, power transmission, gear shifting, vibration reduction and preventing system overload. The double clutch has two structural types: dry type and wet type. The wet type clutch has good control quality, uniform pressure distribution, small and uniform wear, large transmission torque capacity, and long life. Due to mutual sliding between the main and driven friction plates through lubricating oil, large frictional resistance will be generated, the transmission efficiency is low, and auxiliary hydraulic power source and special transmission oil are required. In addition, its structure and manufacturing process are complicated, and the production cost and the price of special transmission oil are all high, thus affecting the performance advantage of the DCT automatic transmission system. Compared with the wet double clutch, the dry double clutch has the advantages of simple structure, high transmission efficiency and low cost, and is being widely valued. However, for dry clutches, there are two major problems: sliding friction heating and wear: when the car starts and crawls, the clutch must be in a sliding friction state to ensure smoothness; when shifting gears, in order to reduce power interruption, there must be torque during the switching process of the two clutches The overlapping of the transmission realizes the smooth shifting of the gear through the slipping of the clutch, so the slipping of the clutch is a necessary condition for realizing the smooth start of the vehicle, low-speed crawling and smooth shifting during the shifting process. Slipping will cause the clutch to generate a lot of heat, resulting in an increase in the temperature of the clutch components. The wear of the friction plate of the clutch increases with the increase of the temperature of the pressure plate. When the temperature of the working surface of the pressure plate exceeds 180-200 ° C, the wear of the friction plate increases sharply, and the excessive surface temperature will also cause deformation of the friction plate and the pressure plate Even ablation damage directly affects the separation/engagement control characteristics, service life and load-carrying capacity of the clutch. However, the heat capacity of the dry clutch is small, and its heat dissipation ability is poor. Therefore, the heat dissipation problem is the key to the control performance, load capacity and service life of the dry dual clutch; how to ensure the service life and service life of the dry dual clutch by reducing the temperature rise The control performance of torque transmission is a key technical problem to be solved for dry dual clutches.

Invention content:

The purpose of the present invention is to overcome the heat dissipation problem of the existing dry clutch with small heat capacity and poor heat dissipation ability, and propose an air cooling device for dry clutches with better heat dissipation and longer service life for automobiles .

The technical solution of the present invention is: the automobile dry-type dual-clutch air cooling device includes a flywheel disc, a clutch housing, a blower, a clutch friction disc, a clutch pressure plate, a guide tube, a clutch cover, etc., and an air inlet is arranged on the clutch housing. On the outside of the air inlet on the clutch housing, a motor-driven blower powered by the vehicle power supply is installed, and under the air inlet inside the transmission housing, there is a middle part that can deliver cooling air to the clutch. The guide pipe has a certain number of radial ventilation holes on the circumference of the flywheel disc and the clutch cover respectively, and a dust cover to prevent dirt and dust from entering is arranged outside the exhaust port on the clutch housing. When working, the blower blows the air outside the transmission through the air inlet. The cooling air reaches the center of the clutch under the guidance of the guide tube and passes through the clutch diaphragm spring. The cooling air passes through the back of the second clutch pressure plate and the pressure plate all the way. The gap between the joint surface of the second clutch disc and the friction disc of the second clutch cools the second clutch pressure disc and the friction disc, and then reaches the exhaust port through the ventilation hole on the clutch cover; the cooling air passes through the friction disc of the second clutch in another way. The torsional vibration damping spring cools the first clutch pressure plate and friction plate through the back of the first clutch pressure plate and the joint surface of the first clutch pressure plate and the first clutch friction plate, and then passes through the ventilation hole on the flywheel plate to the exhaust port. The hot air after cooling the clutch is discharged from the exhaust port, and the working temperature of the clutch components is reduced by means of forced air cooling.

Due to the adoption of the above scheme, the heat dissipation capacity of the clutch has been greatly improved, and the heat dissipation effect is not affected by the vehicle speed. The device has a simple structure and reliable operation, which can effectively solve the problem of clutch torque caused by the high working temperature of the dry double clutch. The problem of transmission control performance and service life can also be applied to solve the problem of high temperature of various automobile dry clutches.

Description of drawings:

Fig. 1 is the front view of the present invention,

In the figure: 1-Flywheel 2-Clutch housing 3-First clutch friction plate 4-First clutch pressure plate 5-Exhaust port 6-Dust shield 7-Second clutch friction plate 8-Second clutch pressure plate 9-clutch cover 10-drain tube 11-intake port 12-blower 13-second friction disc torsional damping spring 14-first friction disc torsional damping spring 15-first clutch diaphragm spring 16-second clutch diaphragm spring

Detailed ways:

The present invention will be further elaborated below in conjunction with the accompanying drawings.

Fig. 1 has provided the structure of the present invention and the schematic diagram of the flow of cooling air, on the clutch housing 2 an air outlet 5 and an air inlet 11 are arranged, and on the clutch housing 2 the outside of the air outlet 5 is provided with a dust cover 6 , to prevent dirt and dust from entering. A motor-driven blower 12 is installed at the position of the air inlet 11 on the clutch housing 2, and a cooling air guide pipe 10 is installed at the position of the air inlet 11 in the clutch housing 2. The blower 12 is driven by the automobile power supply, and the cooling air blown out From the outlet of the guide tube 10 to the middle part of the clutch, and through the first clutch diaphragm spring 15 and the second clutch diaphragm spring 16, part of the cooling air passes through the back of the second clutch pressure plate 8 and the pressure plate and the second The gap on the joint surface of the clutch friction disc 7 cools the second clutch pressure plate 8 and the second clutch friction disc 7, and then reaches the exhaust port 5 through the ventilation hole on the clutch cover 9; another part of the cooling air passes through the second clutch The friction plate torsional vibration damping spring 13 cools the first clutch pressure plate and the first clutch friction plate through the back side of the first clutch pressure plate 4 and the gap between the first clutch pressure plate and the joint surface of the first clutch friction plate 3 , Then through the ventilation holes on the flywheel disc 1 to the exhaust port. After the cooling air cools the clutch parts, the hot air is discharged from the exhaust port 5. Because the motor-driven blower is used to deliver the cooling air, the flow and velocity of the cooling air can be kept constant, which is not affected by the speed of the vehicle, and has a good cooling effect on the clutch parts, thereby ensuring the dry double by reducing the temperature rise of the clutch. Clutch life and controlled performance of torque transfer.

Claims (1)

1. cooling device for vehicle's dry type two clutches, comprise Flywheel disc (1), clutch housing (2), blower (12), clutch disk (3), (7), clutch compressing disc (4), (8), honeycomb duct (10), clutch cover (9), dust-blocking cover (6) etc., it is characterized in that clutch housing (2) is provided with suction port (11) and relief opening (5), the outer position that goes up suction port (11) at clutch housing (2) is equipped with the motor driving blower (12) of being powered by automobile power source, the intermediate portion honeycomb duct (10) that cooling air can be transported to clutch is housed below the inner air inlet of case of transmission (2) (11), have the radial ventilation hole on Flywheel disc (1) and clutch cover (9), dust-blocking cover (6) is equipped with in the outside of going up relief opening (5) at clutch housing (2).

Images