JP2008064189A - Breather of power interrupting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a breather structure of a power interrupting device capable of reducing the cost even in a narrow space. <P>SOLUTION: In the power interrupting device 1 for controlling the power transmission of a clutch mechanism 3 by using an electric motor 5, a vent hole 11 which is communicated with the atmosphere and functions as a breather is formed in a mating surface 9 of a case 7 for storing the electric motor 5 with a clutch mechanism side casing 15. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a power interrupting device having a breather.

Patent Document 1 describes a transfer. In this transfer, a breather chamber is provided in the casing to prevent the oil from blowing out due to a rise in internal temperature. This breather forms ribs that serve as air pockets when the casing is cast, and this air pocket is used as a breather chamber. Yes.
JP-A-6-221408

  In the above transfer, the cost increases due to the formation of the dedicated breather chamber in the casing, and the space for the breather chamber is required in the casing for implementation. Implementation is difficult with casing.

  Accordingly, an object of the present invention is to provide a power interrupter breather that does not increase cost and does not require a large implementation space.

  The breather of the power interrupting device according to claim 1 is a power interrupting device that controls the transmission power of the clutch mechanism using an electric motor, and the atmosphere between the case housing the electric motor and the casing on the clutch mechanism side A vent hole functioning as a breather is provided.

  The breather of the power interrupting device according to claim 2 is a power interrupting device that controls the transmission power of the clutch mechanism using an electric motor, and the casing on the clutch mechanism side is provided with a vent hole that communicates with the atmosphere and functions as a breather. It is characterized by that.

  According to a third aspect of the present invention, there is provided a breather for a power interrupting device according to the first aspect, further comprising a speed reduction mechanism that amplifies the torque of the electric motor that controls the clutch mechanism, and a casing on the clutch mechanism side is provided. A casing for housing the speed reduction mechanism, wherein the vent hole is formed on the housing casing side of the speed reduction mechanism.

  According to a fourth aspect of the present invention, there is provided a breather for a power interrupting device according to the first aspect, wherein the vent hole communicates with the atmosphere by using an existing lightening portion provided in a housing case of the electric motor. It is formed so that it may do.

  The invention according to claim 5 is the breather of the power interrupting device according to claim 2, further comprising a speed reduction mechanism that amplifies the torque of the electric motor that controls the clutch mechanism, and a casing on the clutch mechanism side is provided. A casing that houses the speed reduction mechanism, wherein the vent hole is a pipe that penetrates the housing casing of the speed reduction mechanism in and out.

  The breather of the power interrupting device according to claim 1 is provided with a vent hole in a mating surface between a case of the electric motor and a casing on the clutch mechanism side (for example, a casing that houses the speed reduction mechanism of the electric motor), so that the internal temperature Along with the change, air is circulated inside and outside to function as an air breather, and oil blowout due to an increase in internal pressure is prevented. Thus, the breather of the power interruption apparatus of Claim 1 which prevents blowing-out of oil functions also as a labyrinth seal comprised using the existing member.

  Further, unlike the conventional example in which a dedicated breather chamber is provided in the casing, the air hole is provided by using a mating surface between the electric motor case and the clutch mechanism side casing. This space is also unnecessary and can be easily implemented even with a small casing.

  The breather of the power interrupting device according to claim 2 is provided with a vent hole that communicates with the atmosphere and functions as a breather in a clutch mechanism-side casing (for example, a casing that houses a speed reduction mechanism of an electric motor). Along with this, air is circulated inside and outside to function as an air breather, and oil blowout due to an increase in internal pressure is prevented. Thus, the breather of the power interruption apparatus of Claim 2 which prevents blowing-out of oil functions also as a labyrinth seal comprised using the existing member.

  Further, unlike the conventional example in which a dedicated breather chamber is provided in the casing, the structure of claim 2 in which the vent hole is provided in the clutch mechanism side casing does not increase the cost and does not require a special space. Easy to implement.

  The breather of the power interrupting device of claim 3 can obtain the same effect as that of the configuration of claim 1 only by forming a vent hole on the casing side that houses the speed reduction mechanism of the electric motor.

  The breather of the power interrupting device according to claim 4 is configured such that the vent hole communicates with the atmosphere using the existing lightening portion provided in the housing case of the electric motor without increasing the cost. Can be implemented.

  The breather of the power interrupting device according to the fifth aspect can be easily implemented without increasing the cost only by passing the pipe through the casing accommodating the speed reduction mechanism.

<First embodiment>
The transfer 1 (the breather of the power interrupting device of the first embodiment) will be described with reference to FIGS. 1, 2, and 5. The transfer 1 is used in a four-wheel drive vehicle, and the left and right directions are the four-wheel drive vehicle and the left and right directions in FIGS. 1 and 2. 2 is an enlarged view of the main part of FIG. 1, and the lower side of the drawing is the upper side in the direction of gravity.

  The transfer 1 is configured to control the transmission power of the multi-plate clutch 3 (clutch mechanism) using the electric motor 5, and the motor case 7 housing the electric motor 5 and the multi-plate clutch 3 side casing are aligned. The surface 9 is provided with a vent hole 11 that communicates with the atmosphere and functions as a breather, and has a speed reduction mechanism 13 that amplifies the torque of the electric motor 5 that controls the multi-plate clutch 3, and the casing on the multi-plate clutch 3 side is The reduction gear casing 15 accommodates the reduction gear mechanism 13, and the air hole 11 is formed in the reduction gear casing 15.

  In the above four-wheel drive vehicle, the driving force of the engine is transmitted from the transmission to the front differential, and from the differential case of the front differential, as shown in FIG. 1, the hollow shaft 21, the direction change gear set 23, the drive pinion shaft 25, The vehicle is transmitted to the rear differential via a coupling or the like, and when the coupling is released, the vehicle enters a two-wheel drive state of front wheel drive. Further, differential limiting of the front differential is performed by the multi-plate clutch 3 described above.

  In addition to the multi-plate clutch 3, the electric motor 5, the speed reduction mechanism 13, and the like, the transfer 1 is operated by the ball cam 17 that receives the torque of the electric motor 5 and is moved by the ball cam 17 to fasten the multi-plate clutch 3. The pressure plate 19, the hollow shaft 21 that receives driving torque from the differential case side of the front differential, the direction changing gear set 23 that converts the rotational direction of the driving torque transmitted from the hollow shaft 21, and the direction changing gear set 23. The drive pinion shaft 25 that transmits the output rotation to the rear differential side via the rear wheel side propeller shaft, the intermittent operation of the coupling disposed between the rear wheel side propeller shaft and the rear differential side, and activation of the electric motor 5; It consists of a controller that performs rotation direction switching and stop operations.

  As shown in FIG. 2, the multi-plate clutch 3 is disposed between the clutch housing 27 and the clutch hub 29, and the clutch housing 27 is connected to the hollow shaft 21 by a spline portion 31. A bearing 32 that receives the thrust force from the ball cam 17 is disposed between the cover 75 and the cover 75 (transfer case 71). An axle 33 (FIG. 1) that connects the right output gear of the front differential and the right front wheel passes through the hollow shaft 21, and the clutch hub 29 is connected to the axle 33 by a spline portion 35.

  The electric motor 5 is a reversible rotation type. The motor case 7 is locked to the speed reducer casing 15 by the engaging portion 36 and is fixed to the speed reducer casing 15 by the bolts 37 at the mating surface 9. This part is connected to a rotating shaft 41 that is rotatably supported by the speed reducer casing 15.

  The reduction mechanism 13 includes two reduction gear sets 43 and 45. The reduction gear set 43 includes a small-diameter gear 47 and a large-diameter gear 49 meshed with each other. The small-diameter gear 47 is formed on the rotary shaft 41, the large-diameter gear 49 is supported on the rotary shaft 51, and the rotary shaft 51 is the reducer casing. Both ends are rotatably supported by a support hole 53 and a through hole 55 provided in 15. The reduction gear set 45 includes a small-diameter gear 57 and a large-diameter gear 59 that mesh with each other. The small-diameter gear 57 is formed integrally with the large-diameter gear 49, and the large-diameter gear 59 is one side member of the ball cam 17. It is formed on the outer periphery of the cam ring 61. As shown in FIG. 2, the vent hole 11 is formed along the rotation shaft 51 in the through hole 55 and opens to the outside on the mating surface 9 side.

  The ventilation hole 11 is provided on the upper side in the gravity direction where the splashing oil from the speed reduction gear sets 43 and 45 does not reach, and as shown by the arrow 63 in FIGS. Due to the air breather effect in which the air is communicated, an increase in the internal pressure of the reduction gear casing 15 (transfer case 71) and the blowing of oil are prevented even if the temperature rises.

  The ball cam 17 is provided between the cam ring 61 and the cam ring 65 supported on the cover 75 (transfer case 71) side, and the pressure plate 19 is supported on the outer periphery of the clutch hub 29 so as to support the multi-plate clutch 3. A bearing 67 is disposed between the pressure plate 19 and the cam ring 61 to prevent the ball cam 17 from malfunctioning by blocking the rotation from the multi-plate clutch 3 side, and the pressure plate 19 and the clutch hub 29. A return spring 69 for releasing the engagement of the multi-plate clutch 3 is disposed between the pressure plate 19 and the pressure plate 19 in the direction of releasing the connection of the multi-plate clutch 3.

  When the controller activates the electric motor 5, the rotation is decelerated (torque amplification) by the reduction gear sets 43 and 45 to operate the ball cam 17, and the bearing 67 and the pressure plate 19 are moved to the left by the cam thrust force. The multi-plate clutch 3 is pressed and fastened to limit the differential of the front differential between the differential case (hollow shaft 21: clutch housing 27) and the axle 33 (clutch hub 29). The controller also adjusts the differential limiting force by controlling the rotation angle of the electric motor 5 (cam thrust force of the ball cam 17). When the electric motor 5 is reversed from this state, the cam ring 61 rotates in the opposite direction and the cam thrust force of the ball cam 17 disappears, and the return spring 69 releases the engagement of the multi-plate clutch 3 and the differential limitation of the front differential, Thereafter, the electric motor 5 stops.

  As shown in FIG. 1, the transfer 1 is accommodated in a transfer case 71. The transfer case 71 includes a transfer case main body 73, a cover 75, a clutch case 77, cylindrical cases 79 and 81, and the like. 15 is formed integrally with the clutch case 77. The transfer case main body 73, the cover 75, and the clutch case 77 are integrally fixed by bolts 83 and nuts 85, the cylindrical case 79 is bolted to the transfer case main body 73, and the cylindrical case 81 is bolted to the cylindrical case 79. ing. The transfer case 71 is fixed to the transmission case on the left side surface of the transfer case main body 73, and each of these joint portions is sealed with O-rings 87, 89, 91, 93, 95. The hollow shaft 21 is connected to the hollow shaft connected to the front differential case by a spline portion 97 at the left end. The hollow shaft 21 is supported by the transfer case body 73 by a bearing 99 that receives thrust force, and is covered by a bearing 101 that receives thrust force. The clutch hub 29 of the multi-plate clutch 3 is supported by a clutch case 77 by a bearing 103. The direction change gear set 23 includes bevel gears 105 and 107 meshing with each other. The bevel gear 105 is fixed to the flange portion 111 of the hollow shaft 21 with a bolt 109, and the bevel gear 107 is integrally formed at the front end of the drive pinion shaft 25. The drive pinion shaft 25 is supported on the transfer case main body 73 by a bearing 113 that receives a thrust force on the front end side, and is supported on the cylindrical case 79 by a bearing 115 that receives a thrust force on the rear end side. It is connected to the rear wheel side propeller shaft side by a flange 117 splined to the end.

  Transfer oil is sealed in the transfer case 71 from an oil passage 119 provided in each of the constituent members 73, 75, 77, 79, 81, and a seal 121 disposed between the hollow shaft 21 and the transfer case main body 73. The seal 125 disposed between the axle 33 side hub 123 and the clutch case 77 and the seal 127 disposed between the cylindrical case 81 and the flange 117 prevent oil leakage and entry of foreign matter from the outside. By the seal 121 on the case side, the X ring 129 disposed between the hollow shaft 21 and the clutch hub 29 of the multi-plate clutch 3, and the seal 131 disposed between the clutch hub 29 and the clutch case 77, Mixing of transmission oils with different properties is prevented. The cover 75 and the clutch housing 27 are provided with oil passages 133 and 135 for promoting the movement of oil toward the multi-plate clutch 3, respectively.

  The transfer oil lubricates and cools the direction change gear set 23, the multi-plate clutch 3, the ball cam 17, the reduction gear sets 43 and 45, and the bearings. However, even if the internal temperature of the transfer case 71 rises as described above. The air breather effect of the vent hole 11 prevents the blowout.

  The transfer 1 has the following effects.

  The air breather effect of the air vent 11 formed in the speed reducer casing 15 that houses the speed reduction mechanism 13 prevents oil from blowing out even when the internal pressure increases due to temperature changes.

  Further, unlike the conventional example in which a dedicated breather chamber is provided in the casing, the transfer 1 that can be carried out simply by providing the vent hole 11 in the existing member (reduction gear casing 15) does not increase costs and has a special space. It is unnecessary and can be easily implemented even with a small casing (apparatus).

<Second embodiment>
The transfer 201 (second embodiment of the present invention) will be described with reference to FIGS. 3, 4 and 5. In the following description, the same functional parts and functional members as those of the transfer 1 (first embodiment) are denoted by the same reference numerals, and duplicate explanations are omitted, but the first embodiment is performed if necessary. Refer to the example legend.

The transfer 201 is configured to control the transmission power of the multi-plate clutch 3 (clutch mechanism) using the electric motor 5,
A vent hole 203 that communicates with the atmosphere and functions as a breather is provided in the mating surface 9 of the motor case 7 that houses the electric motor 5 and the casing of the multi-plate clutch 3, and the torque of the electric motor 5 that controls the multi-plate clutch 3 is provided. An air flow path 205 having a speed reduction mechanism 13 for amplifying, wherein the casing on the multi-plate clutch 3 side is a speed reducer casing 15 accommodating the speed reduction mechanism 13, and a vent hole 203 is formed in the speed reducer casing 15; It is formed so as to communicate with the atmosphere through an existing meat removal portion 207 provided in the motor case 7.

  As shown in FIG. 4, on the mating surface 9 side of the motor case 7 with the speed reducer casing 15, there are provided the lightening portions 207 and 209 (existing lightening portions), and as shown in FIG. The air flow path 205 of the machine casing 15 is formed so as to communicate with the lightening part 207, and the air flow path 205 and the lightening part 207 constitute a vent hole 203 communicating between the inside and the outside. In addition, as shown in FIG. 5, a recess 215 is provided at a position facing the bosses 211, 213 between the lightening portions 207, 207 of the speed reducer casing 15, and on the end side, respectively. As shown in FIG. 5, the air that has flowed from the air flow path 205 into the first lightening portion 207 alternately passes through the recesses 215 and the lightening portions 207 and passes through the openings 217. It flows out to the outside.

  The vent hole 203 is provided on the upper side in the gravity direction where the splashing oil from the speed reduction gear sets 43 and 45 does not reach. As shown by the arrow 219 in FIGS. The air breather effect in which the air inside and outside communicates via 205, the lightening portion 207, the concave portion 215, and the opening portion 217), increases the internal pressure of the reduction gear casing 15 (transfer case 71) and blows out oil even if the temperature rises. Is prevented.

  The transfer 201 has the following effects.

  Due to the air breather effect of the air passage 205 formed in the air flow path 205 formed in the speed reducer casing 15 of the speed reduction mechanism 13 and the lightening portion 207 of the motor case 7 of the electric motor 5, the internal pressure increases as the temperature changes. The oil is prevented from blowing out.

  Further, unlike the conventional example in which a dedicated breather chamber is provided in the casing, an air flow path 205 is provided in an existing member (reduction gear casing 15), and the vent hole 203 is utilized using the existing lightening portion 207 of the motor case 7 or the like. The transfer 201, which can be implemented simply by configuring, does not increase cost, does not require a special space, and can be easily implemented even with a small casing (apparatus).

<Third embodiment>
The transfer 301 (third embodiment of the present invention) will be described with reference to FIG. In the following description, the same functional parts and functional members as those of the transfer 1 (first embodiment) are denoted by the same reference numerals, and duplicate explanations are omitted, but the first embodiment is performed if necessary. Refer to the example legend.

The transfer 301 is configured to control the transmission power of the multi-plate clutch 3 (clutch mechanism) using the electric motor 5,
A vent hole 11 that communicates with the atmosphere and functions as a breather is provided in the mating surface 9 of the motor case 7 that houses the electric motor 5 and the casing of the multi-plate clutch 3.
A reduction mechanism 13 that amplifies the torque of the electric motor 5 that controls the multi-plate clutch 3 is provided, the casing on the multi-plate clutch 3 side is a reduction gear casing 15 that houses the reduction mechanism 13, and the vent hole 11 is reduced. The speed reducer casing 15 is provided with a vent hole 303 that communicates with the atmosphere and functions as a breather. The vent hole 303 is a pipe 305 that penetrates the speed reducer casing 15 in and out.

  As shown in FIG. 6, the pipe 305 is arranged on the upper side in the gravity direction where the splashing oil from the reduction gear sets 43 and 45 does not reach, and the inner end of the pipe 305 is cut obliquely, and its cross section 307 is directed in a direction opposite to the oil splashing source.

  Even if the temperature rises, a speed reducer is achieved by the air breather effect in which the internal and external air communicates through the vent hole 303 as indicated by the arrow 309 and the air breather effect in which the internal and external air communicates through the vent hole 11 as indicated by the arrow 63. The increase in internal pressure of casing 15 (transfer case 71) and the blowing of oil are prevented.

  The transfer 301 has the following effects.

  The air breather effect of the air vent 303 formed in the speed reducer casing 15 prevents oil from blowing out even when the internal pressure increases.

  Further, unlike the conventional example in which a dedicated breather chamber is provided in the casing, the transfer 301 that can be carried out only by passing the pipe 305 through the reduction gear casing 15 does not increase cost, does not require a special space, and is compact. This can also be easily implemented with a casing (apparatus).

  Further, the structure in which the pipe 305 is passed through the reduction gear casing 15 is easy to use together with the configurations of the first embodiment and the second embodiment in which the ventilation holes 11 and 203 are provided in the reduction gear casing 15, and the air breather effect is achieved. Can be strengthened.

It is sectional drawing which shows the transfer 1 of 1st Example. FIG. 3 is an enlarged view of a main part of the transfer 1. It is a fragmentary sectional view showing transfer 201 of the 2nd example. 2 is a perspective view showing end portions of an electric motor 5 and a motor case 7. FIG. In the first embodiment and the second embodiment, it is a drawing showing the flow of air through the air holes 11, 203. It is a fragmentary sectional view showing rear differential 301 of the 3rd example.

Explanation of symbols

1 Transfer (Breaser of power interrupter)
3 Multi-plate clutch (clutch mechanism)
DESCRIPTION OF SYMBOLS 5 Electric motor 7 Motor case 11 Ventilation hole 13 Reduction mechanism 15 Reduction gear casing 15 (Clutch mechanism side casing)
201 Transfer (breather of power interrupter)
203 Ventilation hole 207 Meat removal part 301 Transfer (breather of power interrupting device)
303 Vent hole 305 Pipe

Claims (5)

In the power interrupting device that controls the transmission power of the clutch mechanism using an electric motor,
A breather for a power interrupting device, wherein a vent hole communicating with the atmosphere and functioning as a breather is provided on a mating surface between a case housing the electric motor and a casing on the clutch mechanism side. In the power interrupting device that controls the transmission power of the clutch mechanism using an electric motor,
A breather for a power interrupting device, wherein the casing on the clutch mechanism side is provided with a vent hole communicating with the atmosphere and functioning as a breather. The invention according to claim 1,
A reduction mechanism that amplifies the torque of the electric motor that controls the clutch mechanism;
The casing on the clutch mechanism side is a casing that houses the speed reduction mechanism,
The breather for a power interrupting device, wherein the vent hole is formed on a housing casing side of the speed reduction mechanism. The invention according to claim 1,
A breather for a power interrupting device, wherein the vent hole is formed so as to communicate with the atmosphere by using an existing lightening portion provided in a housing case of the electric motor. The invention described in claim 2,
A reduction mechanism that amplifies the torque of the electric motor that controls the clutch mechanism;
The casing on the clutch mechanism side is a casing that houses the speed reduction mechanism,
A breather for a power interrupting device, wherein the vent hole is a pipe penetrating an accommodation casing of the speed reduction mechanism.

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