JPS6141023A - Frictional clutch - Google Patents

Abstract

PURPOSE:To permit the application of the captioned apparatus into the equipment which receives the bad influence of magnetic material by forming one or both of the driving and trailing frictional plates from the plate members which are made of austenite steel material whose surface is applied with salt-bath nitriding treatment, thus increasing the rate of use of nonmagnetic material. CONSTITUTION:When pressurized oil is supplied through a passage 8 into a cylinder 2 formed in a driving drum 1, a piston 3 shifts in the Z direction, and a driving frictional plate 4 and a trailing frictional plate 7 are press-attached. Therefore, the power of the driving drum 1 is transmitted to an output shaft 5 through the above-described both frictional plates 4 and 7 and a clutch hub 6. In this case, one or both of the above-described frictional plates 4 and 7 are made of the austenite stainless steel material such as hot-rolled stainless steel plate, etc., and the surface is applied with the hardening treatment by the salt bath nitriding (tufftriding). Therefore, the rate of use of nonmagnetic material can be increased, maintaining the high abrasion resistance and seizureproofness, and an aimed purpose can be achieved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a clutch mounted on a ship mainly using non-magnetic materials, such as an underwater exploration ship.

[Conventional technology]

An underwater exploration vessel is a vessel that detects and removes obstacles floating on the sea or in the sea using detectors such as radar and ultrasonic transmitters.

Therefore, equipment mounted on such underwater exploration vessels is required to use non-magnetic materials.

Among the above-mentioned mounted devices, magnetic materials such as hard carbon steel and alloy steel have conventionally been exclusively used for the friction plates of the clutches from the viewpoint of their wear resistance.

[Problem that the invention seeks to solve]

As mentioned above, underwater exploration vessels equipped with friction clutches using magnetic materials have low detection performance due to the low usage rate of non-magnetic materials, and also have problems such as rusting on the surface of the magnetic friction plates. There is.

The present invention was made in view of the above, and aims to improve the detection performance of an underwater exploration vessel and the durability of a friction plate by increasing the usage rate of non-magnetic materials.

[Meaning 2 to solve the problem] In order to solve the above problem, the present invention provides that the surface of either or both of the driving friction plate and the driven friction plate is subjected to salt solution nitriding treatment on the surface of the austenitic steel material. It is characterized by being constructed from hardened board materials. This increases the usage rate of non-magnetic materials in the clutch, improves its wear resistance and seizure resistance, and also prevents rusting of the clutch friction plates.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. The figure shows the main parts of a hydraulic friction clutch for an underwater exploration vessel. In the drawing, 1 is a drive drum, and 2 is a cylinder formed on the drive drum. , 3 is a piston that reciprocates within the cylinder 2, 4 is a drive friction plate fitted to the fitting teeth 4a of the drive drum 1, 5 is an output shaft, and 6 is a clutch hub fixed to the output shaft 5. , 7 is a driven friction plate fitted to the fitting teeth 6a of the clutch hub 6, and 8 is a pressure oil passage to the cylinder 2.

The driving friction plate 4 and the driven friction plate 7 are made of austenitic stainless steel materials such as hot-rolled stainless steel plates and stainless steel rods, and their surfaces are hardened by a salt solution nitriding method (tuftride method).

The salt solution nitriding method is a method in which steel is immersed in a special molten salt to form a nitrogen compound layer and a carbon and nitrogen diffusion layer on its surface, thereby improving wear resistance and seizure resistance. However, since this is a known method, detailed explanation thereof will be omitted.

In the clutch having the above configuration, when pressure oil is supplied into the cylinder 2 through the pressure oil passage 8, the piston 3 moves to the position shown in the figure.
Moving in the direction of the arrow, the driving friction plate 4 and the driven friction plate 7 are brought into pressure contact with each other with sliding occurring between their surfaces. Both friction plates 4
, 7 are pressed against each other, the power of the drive drum 1 is transferred to the friction plates 4, 7.
and is transmitted to the output shaft 5 via the clutch hub 6.

In such a clutch, as mentioned above, slipping occurs between the friction plates 4 and 7 when the liquid film forms thereon, but since the surfaces of the friction plates 4 and 7 are subjected to salt solution nitriding treatment, the friction is reduced. The plates 4 and 7 will not wear out or seize.

Further, since the friction plates 4 and 7 are made of austenitic stainless steel, which is a non-magnetic material, the usage rate of non-magnetic materials in the entire ship is increased, and the detection performance is improved.

In the above embodiment, both the driving friction plate 4 and the driven friction plate 7 are made of a plate material whose surface is subjected to salt solution nitriding treatment on the surface of austenitic stainless steel material, but either one of the friction plates is made of the above plate material. may be configured.

〔Effect of the invention〕

The present invention is constructed as described above.According to the present invention, the friction plate of the clutch is made of an austenitic steel plate treated with salt solution nitriding, so that it maintains high wear resistance and seizure resistance. It is possible to increase the usage rate of non-magnetic materials compared to the conventional method. Therefore, in the case of a clutch for an underwater exploration vessel, the detection performance of underwater floating objects is improved. It also prevents the clutch plate from rusting and improves the durability of the clutch.

[Brief explanation of the drawing]

The drawing is a sectional view of a main part showing one embodiment of the present invention. 1... Drive drum, 3... Piston, 4... Drive friction plate, 7... Driven friction plate

Claims (1)

[Claims] In a friction clutch that transmits power from the drive system to the output system by pressing a driving friction plate and a driven friction plate, either or both of the driving friction plate and the driven friction plate are coated with salt solution on the surface of the austenitic steel material. A friction clutch characterized by being constructed from a nitrided plate material.