JPS5810036Y2 - Belt type continuously variable transmission - Google Patents

Description

[Detailed explanation of the invention] This invention relates to a belt-type continuously variable transmission, especially its speed change.
When lubricating oil is sealed on the sliding surface of the movable conical plate of the pulley, one or both of the seals on both sides are designed to have a double seal structure with a play gap to absorb and alleviate the expansion and contraction of the oil to prevent leakage of the sealed oil. Of course,
A belt-type stepless type with high practical value that quickly absorbs and alleviates changes in internal pressure caused by thermal expansion or contraction, and also prevents air from entering the oil chamber, allowing it to withstand long, harsh high-speed operations without oil. Our goal is to provide transmissions at low prices.

Conventionally, this type of continuously variable transmission generally uses grease for lubrication, making it impossible to operate without lubrication.
In addition, for products that use lubricating oil, oil leakage may occur due to changes in internal pressure due to thermal expansion or contraction of the sealed oil.
This has not yet been put to practical use because a sealing structure with a sealing effect sufficient to deal with air inflow, etc., has not been developed.

This invention eliminates these conventional drawbacks and enables long-term lubrication-free operation, and one embodiment thereof will be described below with reference to the drawings.

In the drawings, reference numeral 1 denotes a fixed conical plate, which is fixed to a rotating shaft 6 via a key 7.

Reference numeral 2 denotes a movable conical plate, which is fitted onto the rotary shaft 6 via a key 8 so as to be fixed in the rotational direction but freely slidable in the axial direction, and is opposed to the fixed conical plate 1. Double conical plate 1,
2, the speed is changed by forming a pulley, and the spring 10 interposed between the movable conical plate 2 and the spring receiver 9 fixed to the rotary shaft 6 constantly presses the movable conical plate 2 toward the fixed conical plate 1 side. , 2 is held under pressure to prevent slippage.

One or both of the oil sealing parts on both sides of the sliding surface 3 of the movable conical plate 2 are provided with a certain play gap a in the axial direction.
It has a double seal structure consisting of a movable seal member 4 and a fixed seal member 5 that can slide by a certain amount.

That is, in the example, only one seal part has a double seal structure, and the movable seal member 4, in which the shield ring 4a is fitted into the shield case 4b, can be slid in the axial direction by a certain amount of play a. The movable seal member 4 is fitted with a fixed seal member 5 made of a shield ring that is brought into close contact with the outer surface of the shield case 4a, and the other seal part is provided with a shield ring 12 to seal the oil chamber. We are trying to improve the internal pressure and adapt to changes in internal pressure.

Note that an oil seal with an outer diameter fitting may be used instead of the shield ring 4a and shield case 4b in the double-structured seal portion.

In the figure, 13 is a double seal retaining ring, 14 is an oil storage recess formed in the rotating shaft 6, and 15 is a retaining ring 16 of the fixed conical plate 1, which is a retaining ring of the spring receiver 9.

In the above configuration, when the sealed oil A reaches a high temperature and thermally expands, the movable seal member 4 moves to the left by an amount of play a and absorbs this, so that the problem of oil leakage does not occur, and the oil When A is cooled, the movable seal member 4 moves to the right by the play gap a following the contraction of the oil, thereby preventing air from flowing into the oil chamber.

Therefore, even if heat generation increases due to severe operation, problems such as leakage of sealed oil or air intrusion do not occur, and lead-free oil operation can be performed for a long period of time without any change in oil quality.

As explained above, in this invention, one or both of the seal parts on both sides of the sliding surface of the movable conical plate in a belt type continuously variable transmission has a double seal structure with a certain play gap.
There is no oil leakage or air inflow due to thermal expansion or contraction of the oil, allowing for long-term use without lubrication.

[Brief explanation of drawings]

The drawing is a sectional view showing an embodiment of this invention. 1... Fixed conical plate, 2... Movable conical plate, 3... Sliding surface, a... Play gap, 4
・・・・・・Movable seal member, 5: Fixed seal member, A: Enclosed oil.

Claims (1)

[Scope of utility model registration request] A variable speed V-pulley is constructed by arranging a movable conical plate 2 opposite to a fixed conical plate 1 in a state where the movable conical plate 2 is always pressed.
A double seal structure consisting of a movable seal member 4 and a fixed seal member 5, which are capable of sliding one or both of the oil seal parts on both sides of the sliding surface 3 of the movable conical plate 2 in the axial direction by a certain play gap a. A belt-type continuously variable transmission characterized by the following.