JPH0529380Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a compound powder clutch used in the power transmission path of a vehicle such as an automobile. It is related to.

[Prior Art] In a powder clutch, heat is generated by the clutch slip during high load and high slip, and the internal temperature becomes high, which causes deterioration of the powder, bearings, and damper rubber of the clutch damper mechanism, so a cooling mechanism must be provided. is proposed.

Conventionally, as a powder clutch equipped with a cooling mechanism, a single type powder clutch is known, for example, the one disclosed in Japanese Utility Model Application No. 57-24332. That is, as shown in FIG.
A shielding member 108 is provided in which magnetic powder is disposed in 4, and a shielding member 108 is provided to shield the interior 1 including the powder gap 104 from the exterior 0, and a communication path 106a is formed in the shielding member 108 to communicate the interior and exterior.
The heat generated by the excitation coil 107 and the slip heat stored inside are discharged by the air passing through the communication path 106a.

[Problems to be Solved by the Invention] However, in the above-mentioned conventional technology, since air flows in and out through the communication path 106a due to air thermal expansion, the cooling effect is still not sufficient. There have been problems in that high-temperature air flows through the clutch, causing grease to leak out and deteriorating the bearing 110, or that the grease gets mixed in with the magnetic powder, degrading clutch performance.

Further, when the connecting passage 106a is opened toward the engine side, warm air near the engine is circulated into the interior 1, and the cooling effect may be extremely reduced.

In particular, even if the communication path according to the above-mentioned conventional technology is applied to a compound powder clutch, that is,
Even when applied to a clutch that is connected by a first and second connecting body connected by a connecting member and a third connecting body disposed between them, the heat generated by the first connecting body on the outside is released from the outer peripheral surface of the clutch. However, since the heat generated in the inner second connecting body is difficult to be released to the outside, the inside temperature tends to become even higher. For this reason,
There was a problem that the deterioration of internal bearings etc. was accelerated.

[Means for solving the problem] The present invention, which has been made to solve the above problem, is a double-layer powder clutch comprising first and second connecting main bodies having a cylindrical gap, rotatable together via a connecting member and connected to a primary power transmission shaft, a third connecting main body interposed between the first connecting main body and the second connecting main body to form first and second powder gaps having magnetic powder, supported coaxially with the second connecting main body via a bearing and connected to a secondary power transmission shaft, and a powder chamber formed in a ring shape between the second connecting main body and the third connecting main body, wherein the first and second connecting main bodies and the third connecting main body are connected to each other by applying an electromagnetic force between the first and second connecting main bodies and the third connecting main body via magnetic powder, the double-layer powder clutch further comprising: a first communication passage facing the powder chamber and formed in the second connecting main body on the outer circumferential side of the bearing, communicating the powder chamber with the outside in the primary power transmission axial direction; The gist of the compound powder clutch is that it comprises: a second communication passage facing the powder chamber and formed in a rotating shaft side partition of the third connecting main body, communicating the powder chamber with a rotating shaft side space of the third connecting main body; a third communication passage communicating the rotating shaft side space of the third connecting main body with the outside in the secondary power transmission axial direction; and a vane which, in conjunction with the rotation of the first, second connecting main body or the third connecting main body, causes air on the outside in the secondary power transmission axial direction to pass through the third communication passage, the second communication passage and the first communication passage in that order, and further characterized in that the bearing is provided on the leeward side of the powder chamber, and a regulating section is provided on the windward side of the bearing for regulating the flow of the air into the bearing.

[Function] When the drive shaft rotates while the first and second connecting bodies and the third connecting body are connected by electromagnetic force through magnetic particles, the inside becomes high temperature due to the heat generated by the excitation current and slip heat. become.

At this time, the blades rotationally interlocked with the first and second connecting bodies or the third connecting body suck air from the first communication path. This suction generates a flow of air across the first communication path, the second communication path, and the third communication path.
As a result, air outside in the direction of the secondary power transmission axis passes through the powder chamber and flows to the outside in the direction of the primary power transmission axis. Therefore, this circulating air absorbs heat in and around the powder chamber and radiates the heat.

Furthermore, in the present invention, since the bearing is disposed on the leeward side of the powder chamber, the cooling air cools the bearing after cooling the powder chamber and flows to the leeward side. Therefore, even if the grease adhering to the bearing evaporates, the evaporated grease flows to the leeward side, so that the grease does not enter the powder chamber on the windward side.

In other words, the powder chamber can be suitably cooled by the cooling air, and since grease does not enter the powder chamber, clutch failure is prevented.

In addition, the cooling air flowing out from the powder chamber is regulated from flowing into the bearing by the regulating section installed on the windward side of the bearing, so even if powder flows out from the powder chamber together with the cooling air, it will not flow into the bearing. This prevents failures from occurring.

Furthermore, since the first communication passage is formed on the outer peripheral side of the bearing (therefore, on the leeward side of the powder chamber),
The (heavy) powder that flows out from the powder chamber is
Due to the centrifugal force, the powder is discharged through the first communication path, and from this point as well, the powder is prevented from damaging the bearing.

[Example] An example of the present invention will be described below with reference to the drawings.

In FIG. 1, 1 is a drive shaft as a primary power transmission shaft, a flywheel 3 is attached to this drive shaft 1 via bolts 2, and a first connecting body 5 is attached via bolts 4. There is. The first connecting body 5 consists of annular divided members 5A and 5B made of a magnetic material, an excitation coil 6 is housed inside, and a non-magnetic piece made of a non-magnetic material is attached to the inner periphery. has been done.

A second connecting body 10 having a friction surface 10a is arranged opposite to the first connecting body 5, and this second connecting means 10 is connected to the bolt 4 by connecting the first connecting body 5 and a connecting member 12 made of a non-magnetic material. , 13. That is, the connecting member 12
is the recess 5 of the first connecting body 5 at its outer peripheral surface 12a.
a, the recess 1 of the second connecting body 10 in the central part 12b
0b, and the inner peripheral portion 12
c holds one side of the bearing 15.

The bearing 15 is positioned together with the inner peripheral portion 12c by the retainer 17 and the snap spring 18, and is attached to the cylindrical portion 2 of the third connecting body 20.
It is rotatably interposed in the second connection main body 10 via the outer periphery of 0a and the connection member 12.

The cylindrical outer peripheral portion 20b of the third connection main body 20 is
inserted between the first and second connecting bodies 5 and 10,
First and second powder gaps 24a and 24b containing magnetic powder (not shown) are formed to constitute a so-called compound powder clutch.

The space including the second powder gap 24b surrounded by the second connecting body 10 and the third connecting body 20 is
A ring-shaped powder chamber P is formed.

Bottomed part 20 on the left side in the illustration of the third connecting body 20
c is connected to a cylindrical hub part 30 via a pin 25, a connecting member 26, and a rubber damper mechanism 28, and a driven shaft 32 as a secondary power transmission shaft is spline-fitted on the inner circumference of this hub part 30. are combined.

A cover member 35 is provided on the outer periphery of the driven shaft 32.
is arranged on the rear surface 35a of the cover member 35.
It is attached to the first connecting body 5 with bolts 37, and a slip ring 38 is attached to the outer periphery of the cylindrical portion 35b, so that power is supplied to the excitation coil 6 via wiring 39.

The first and second powder gaps 24a, 24b
A labyrinth 50 is provided to prevent magnetic particles placed in the powder gap from escaping from the powder gap.

On the other hand, the retainer 17 attached to the second connecting main body 10 has small wings 60 as shown in FIG.
(Fig. 3) and large wings 62 (Fig. 4) are installed alternately, and ventilation holes 6 are provided between the large wings 62.
4 and bolt holes 63 are drilled.

Further, a through hole 65 is bored in the connecting member 12 as the first communicating path L1 to communicate with the through hole 64 shown in FIG.
A communication hole 67 is formed in. Second communication path L2
A communication hole 68 is formed in the cylindrical portion 20a.

Between the hub portion 30 and the cylindrical portion 20a, the third connecting body 20 and the hub portion 30 are connected to a rubber damper mechanism 28.
A gap is formed to prevent interference between the two when they move relative to each other. This gap forms the third communication path L3.

Further, on the windward side (left side in the drawing) of the bearing 15, an annular first regulating portion K1 extends from the second connecting body 10 to the cylindrical portion 20a side of the third connecting body 20, covering the bearing 15. Moreover, the windward side of the bearing 15 of the cylindrical part 20a (and the windward side of the first restricting part K1) protrudes outward, and the second restricting part K covers a part of the windward side of the bearing 15.
It is said to be 2.

Note that 100 is a clutch housing.

Next, the operation of the above configuration will be explained.

First, the connecting action of the clutch is performed by connecting the excitation coil 6 through the slip ring 38 and the wiring 39.
This is done by energizing and energizing. When the excitation coil 6 is energized, magnetic flux as shown by the broken line S is generated. Due to the generation of this magnetic flux, the first
The magnetic particles arranged in the second powder gaps 24a and 24b are connected to each other in a chain, and due to the frictional force and electromagnetic coupling force between the magnetic particles, the first and second connecting bodies 5, which are the driving side members, , 10 and the third connecting body 20, which is a driven member, are connected to perform power transmission.

During the power transmission, as the first and second connecting bodies 5 and 10 rotate, the large and small wings 60 and 62 attached to the retainer 17 rotate, and air flows into the transformer as the outside in the direction of the secondary power transmission axis. It moves from the transmission side A to the engine side B as the outside in the direction of the primary power transmission shaft.

That is, as shown by the dashed line, between the transmission side A and the damper mechanism 28, etc. →
Communication hole 68 of third connecting body 20 → communication hole 67 → through hole 65 of connecting member 12 → through hole 64 of retainer 17
→ Large and small wings 60, 62 → Communication hole 3 of flywheel 3
a, and is discharged to the engine B side through the inside of the cylindrical portion 20a of the third connecting body 20, as shown by the two-dot chain line. This air flow causes
Heat generated by slippage between the clutches is discharged to the outside, improving cooling performance.

Therefore, since the temperature inside the clutch is lowered, the rubber of the rubber damper mechanism 28 is prevented from deteriorating, the Chris of the bearing 15 is prevented from deteriorating and leaking, and the temperature of the friction surfaces of the clutch is also reduced.

Here, the reason why the above-mentioned air flow is generated from the transmission side A to the engine side B is as follows.

That is, in general, in a vehicle, the temperature distribution within the clutch housing 100 is low on the transmission side A and high on the engine side B. The temperature difference varies depending on the engine used, the type of transmission, and the conditions of use, but it can reach approximately 80 to 100 degrees Celsius. Therefore, by drawing in cold air and discharging it into a high temperature atmosphere, the cooling efficiency of the clutch itself can be increased. In addition, this discharged air stirs the high temperature atmosphere on the engine side B and promotes air flow within the clutch housing 100, so that heat is transferred to the clutch housing 100 and the clutch housing 10
0 to the outside of the housing, and the heat dissipation of the clutch housing 100 itself is also improved. In other words, it is possible to improve the cooling performance of the clutch housing 100 itself.
The atmospheric temperature inside the engine is lowered, and the cooling performance of the clutch is further improved.

In particular, since the bearing 15 is disposed on the leeward side of the powder chamber P, grease leaked or evaporated from the bearing 15 will not flow into the powder chamber P, thus preventing problems such as clutch slippage due to this grease. can be prevented from occurring.

Further, on the windward side of the bearing 15, a first and a second
Since the regulating portions K1 and K2 are provided, even if powder flowing out from the powder chamber P is contained in the cooling air passing through the first communication path L1 from the second communication path L2, this powder is 1. Second regulating part K1, K
2 prevents it from entering the bearing 15. Therefore, the life of the bearing 15 is improved.

Moreover, since the first communication path L1 is formed on the outer peripheral side of the bearing 15 (therefore, on the leeward side of the powder chamber P), the (heavy) powder flowing out from the powder chamber P is affected by centrifugal force. Therefore, the first communication path L
1, and from this point as well, the powder is prevented from damaging the bearing 15.

Furthermore, since the heat radiation area is increased by the blades 60 and 62, cooling efficiency is further improved.

Note that the first and second regulating parts K1 and K2 are not particularly limited as long as they are configured to regulate the inflow of cooling air (that is, the inflow of powder) to the bearing 15. For example, the first and second regulating parts K1 and , K2, a certain degree of effect can be obtained even if only one of them is used.

[Effects of the invention] As explained above, according to the invention, the air flow generated by the blades rotationally interlocked with the first and second connecting bodies or the third connecting body is introduced from, for example, the transmission side, and It is discharged via . As a result, internal heat is dissipated to the relatively low temperature outside air on the transmission side, thereby cooling the inside of the clutch. Therefore, deterioration of the rubber damper mechanism and bearings inside the clutch is prevented.

In particular, in the present invention, since the bearing is disposed on the leeward side of the powder chamber, the grease on the bearing does not enter the powder chamber, thereby preventing deterioration of clutch performance due to grease.

Further, since the cooling air from the powder chamber is restricted from flowing into the bearing by the restriction section provided on the windward side of the bearing, the bearing will not be damaged by the powder that flows out.

Furthermore, since the first communication passage is formed on the outer circumferential side of the bearing, the powder flowing out from the powder chamber is discharged through the first communication passage by centrifugal force.
Also from this point of view, the powder does not cause trouble to the bearing.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing a compound powder clutch according to an embodiment of the present invention, Fig. 2 is a plan view showing the main parts of the same embodiment, and Fig. 3 is a sectional view taken along the - line in Fig. 2. , FIG. 4 is a sectional view taken along the - line in FIG. 2, and FIG. 5 is a sectional view showing the conventional technique. 5...First connecting entity, 10...Second connecting entity,
12... Connection member, 15... Bearing, 17...
...Retainer, 20...Third connecting body, 24a, 2
4b,...first and second powder gaps, 50...
Labyrinth, 60, 62...Wings (large and small), 64,
65...Through hole, 68...Communication hole, K1...First regulation part, K2...Second regulation part, L1...First communication passage, L2...Second communication passage, L3...Third communication aisle,
P...Powder room.

Claims (1)

[Claims for Utility Model Registration] First and second connecting bodies having a cylindrical gap, rotatable together through a connecting member, and connected to a primary power transmission shaft; The powder gap is inserted between the connecting body and the second connecting body to form first and second powder gaps having magnetic powder, and is coaxially supported via a bearing on the same axis as the second connecting body. a third connecting body connected to the next power transmission shaft; a powder chamber formed in a ring shape between the second connecting body and the third connecting body, the first and second connecting bodies; In a compound powder clutch that connects the first and second connecting bodies and the third connecting body by applying electromagnetic force through magnetic particles between the main body and the third connecting body, facing the powder chamber and , a first communication passage formed in the second connection main body on the outer peripheral side of the bearing and communicating between the powder chamber and the outside in the direction of the primary power transmission axis; a second communication passage formed in the partition wall on the rotating shaft side of the third connecting body and communicating between the powder chamber and the rotating shaft side space of the third connecting body; a third communication path that communicates with the outside in the direction of the secondary power transmission axis; and a blade that allows air to pass through the third communication path, the second communication path, and the first communication path in this order; further, the bearing is provided on the leeward side of the powder chamber, and the bearing is provided on the windward side of the bearing. The compound powder clutch is characterized in that it is provided with a regulating portion that regulates the inflow of air into the bearing.