JP2023089731A - power transmission device - Google Patents

Abstract

To provide a power transmission device which enables a harness to be arranged easily in a housing case which houses a power transmission mechanism.SOLUTION: A power transmission device 10 includes: a housing case 200 which houses a power transmission mechanism; and a harness 230 arranged inside the housing case 200. The housing case 200 includes: a first case part 210; and a second case part 212 connected to the first case part 210 and has a cylindrical part 220 which is formed in a cylindrical shape so as to connect a first opening 222, which is open to the first case part 210 side in a connection direction X of the first case part 210 and the second case part 212, with a second opening 224, which is open to the opposite side of the first opening 222 in the connection direction X. The harness 230 is arranged in the connection direction X through the cylindrical part 220.SELECTED DRAWING: Figure 4

Description

The present invention relates to power transmission devices.

2. Description of the Related Art Conventionally, there has been provided a power transmission device such as a power transmission device disclosed in Patent Document 1 below, in which a power transmission mechanism such as a CVT is housed inside a housing case. The power transmission device of Patent Document 1 covers the front portion of a transmission mechanism such as a CVT in a first portion that constitutes a housing case, and covers the rear portion of the transmission mechanism in a second portion that is connected to the first portion. It is considered to be covered. Further, the power transmission device of Patent Document 1 has a configuration in which a transfer is arranged in a third portion following the rear of the second portion in the storage case. Further, in the power transmission device of Patent Document 1, a clutch for selectively disconnecting or connecting the power transmission path to the transfer is provided on the rear side of the second portion.

JP 2021-79924 A

Here, in the conventional power transmission device described above, the harness connected to the clutch actuating device is passed through the first hole provided near the boundary between the first portion and the second portion inside the housing case. , to pass through a second hole provided in the second portion and reach the rear side of the second portion. However, in the power transmission device of the prior art, in a state in which the first portion and the second portion of the storage case are connected and assembled, the wiring work of the harness is performed from the first hole toward the second hole. The second hole cannot be visually confirmed when performing Therefore, the power transmission device of the prior art has the problem that the wiring work of the harness is difficult and requires skill.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a power transmission device in which a harness can be easily routed inside a housing case that houses a power transmission mechanism.

(1) A power transmission device according to the present invention transmits power input from a driving force source in a vehicle, and includes a housing case housing a power transmission mechanism and a harness routed inside the housing case. and, wherein the storage case includes a first case portion and a second case portion connected to the first case portion, and in the connecting direction of the first case portion and the second case portion a tubular portion formed in a tubular shape so as to connect a first opening that opens toward the first case portion and a second opening that opens on the side opposite to the connecting direction with respect to the first opening; and the harness is routed in the connecting direction through the tubular portion.

In the power transmission device of the present invention, in the connection direction of the first case portion and the second case portion that form a housing case that houses the power transmission mechanism, the first opening portion that opens toward the first case portion side and the first opening portion are provided. It has a cylindrical part that connects the second opening that opens on the opposite side of the connection direction. Therefore, in the power transmission device of the present invention, by inserting the harness into the tubular portion through the first opening and pushing the harness along the tubular portion, or by pushing the harness in the opposite direction, the second A harness can be routed from the first opening to the second opening. In this manner, the power transmission device of the present invention is designed to allow wiring of the harness using the cylindrical portion as a guide. Therefore, in the power transmission device of the present invention, the harness can be easily routed inside the housing case that houses the power transmission mechanism, regardless of the skill level of the operator.

(2) In the power transmission device of the present invention described above, the first case portion has an oil pan, and the tubular portion provides the oil pan from the second case portion to the first case portion. It may be characterized by being able to form an oil return path for returning oil to the oil pan.

In the power transmission device of the present invention, the cylindrical portion provided in the housing case functions as a routing path for the harness, and in addition, it is used to return oil from the second case portion to the oil pan provided in the first case portion. It can be utilized as having a function as an oil return path. As a result, the power transmission device of the present invention can simplify the device configuration by that much without separately providing a configuration for configuring the oil return path. Further, the power transmission device of the present invention is provided with an oil return path, thereby suppressing the retention of oil in the second case portion and smoothly returning the oil to the oil pan on the side of the first case portion. be able to. As a result, it is possible to suppress the amount of oil required in the power transmission device and to suppress the occurrence of air suction in the strainer.

(3) In the above-described power transmission device of the present invention, part or all of the cylindrical portion is formed so as to slope downward from the second opening side toward the first opening side. It is preferable that it is characterized by:

With the power transmission device of the present invention configured as described above, it is possible to smoothly discharge oil or the like that has entered the interior of the cylindrical portion toward the first opening portion. In particular, when the cylindrical portion is used as an oil return path for returning oil from the second case portion to the first case portion as described above, the retention of oil inside the cylindrical portion is suppressed, Oil can be smoothly returned to the first case part side.

(4) The power transmission device of the present invention described above is preferably characterized in that the opening area of the first opening is larger than the opening area of the second opening.

By configuring the power transmission device of the present invention as described above, it becomes easier to insert the harness into the cylindrical portion from the first opening side. Further, with the power transmission device of the present invention configured as described above, it is possible to accurately determine the extraction position of the harness to be extracted from the cylindrical portion on the second opening side.

(5) In the power transmission device of the present invention described above, part or all of the cylindrical portion is formed so that the cross-sectional area decreases from the first opening side toward the second opening side. It should be characterized by:

The power transmission device of the present invention has the above-described configuration, so that the harness inserted into the cylindrical portion from the first opening side is provided in the second opening as it moves toward the second opening. It can be smoothly guided to the position. Thereby, the power transmission device of the present invention can further improve workability for routing the harness from the first opening to the second opening.

(6) In the power transmission device of the present invention described above, a device to which lubricating oil is supplied is accommodated inside the second case portion, and the oil used for lubricating the device is supplied to the device side. and the second opening is open to the device on the bottom side of the second case. and good.

The power transmission device of the present invention is configured as described above, so that the oil that has fallen on the bottom side of the second case portion after being used for lubrication of the equipment provided inside the second case portion can be smoothly removed. It can be taken into the cylindrical part. As a result, the power transmission device of the present invention can effectively utilize the cylindrical portion provided in the housing case as a path for smoothly returning oil from the second case portion side to the first case portion side.

(7) In the power transmission device of the present invention described above, the first case portion accommodates a transmission to which power output from the driving force source is input, and the second case portion accommodates the speed change a clutch to which power output from a machine is input, and a clutch actuating device for actuating the clutch are accommodated, and the harness is connected to the clutch actuating device. It is better if it is

With the power transmission device of the present invention having the above-described configuration, even when the transmission is assembled in the first case portion and the clutch and the clutch operating device are assembled in the second case portion, the The harness can be easily routed.

(8) In the power transmission device of the present invention described above, the housing case further includes a third case portion connected to the second case portion on a side opposite to the first case portion. , the first case portion accommodates a transmission to which power output from the driving force source is input, the third case portion accommodates a transfer, and the second case portion includes: It may contain a clutch for selectively disconnecting or connecting a power transmission path between the transmission and the transfer, and an actuating device for actuating the clutch.

In the power transmission device of the present invention, even if the transfer is accommodated in the third case portion connected to the second case portion on the side opposite to the first case as described above, the inside of the accommodation case , the harness can be easily routed.

Advantageous Effects of Invention According to the present invention, it is possible to provide a power transmission device in which a harness can be easily routed inside a housing case that houses a power transmission mechanism.

1 is an explanatory diagram showing a vehicle equipped with a power transmission device according to an embodiment of the invention; FIG. FIG. 2 is a bottom view of the power transmission device according to the embodiment of the present invention with an oil pan removed; 1 is a side view of a power transmission device according to an embodiment of the present invention, viewed from the rear side of a vehicle with a third case portion removed; FIG. FIG. 3 is a cross-sectional view taken along the line AA of FIG. 2; FIG. 4 is an enlarged perspective view showing a cylindrical portion of the power transmission device according to the embodiment of the invention, viewed from the second opening side;

A power transmission device 10 according to an embodiment of the present invention will be described below with reference to the drawings, taking as an example a four-wheel drive vehicle (vehicle V) employing the same. In addition, in the following description, before referring to the characteristic configuration of the power transmission device 10, the schematic configuration of the vehicle V will be described.

<<Regarding the schematic configuration of the vehicle V equipped with the power transmission device 10>>
FIG. 1 is a diagram illustrating a schematic configuration of a vehicle V to which the present invention is applied. As shown in FIG. 1, the vehicle V includes a power transmission device 10, a driving force source 12, a pair of left and right front wheels 14L, 14R, a pair of left and right rear wheels 16L, 16R, a control device 100, and the like. The vehicle V is in a two-wheel drive state in which the driving force is transmitted to the rear wheels 16L and 16R, and a four-wheel drive state in which the driving force is transmitted to the front wheels 14L and 14R in addition to the rear wheels 16L and 16R. It is a four-wheel drive vehicle that can be switched as needed.

The driving force source 12 is for generating the driving force of the vehicle V. As shown in FIG. The driving force source 12 can be configured by, for example, an engine, a motor, or the like. Further, the front wheels 14L and 14R constitute auxiliary driving wheels in the vehicle V. As shown in FIG. The front wheels 14L and 14R function as drive wheels in the four-wheel drive state, and function as driven wheels in the two-wheel drive state. The rear wheels 16L and 16R constitute main drive wheels in the vehicle V. As shown in FIG. The rear wheels 16L, 16R function as drive wheels in both the four-wheel drive state and the two-wheel drive state.

The power transmission device 10 is a device for transmitting power input from the driving force source 12 in the vehicle V. As shown in FIG. As shown in FIG. 1 , the power transmission device 10 has a power transmission mechanism 18 . The power transmission device 10 also includes a transmission 20 and a transfer 22 as the power transmission mechanism 18 .

The power transmission device 10 includes a front-wheel differential gear device 28, a rear-wheel differential gear device 30, a pair of left and right front-wheel axles 32L, 32R, and a front-wheel differential gear device 28, a rear-wheel differential gear device 30, and a pair of left-right front-wheel axles 32L, 32R. And power can be transmitted toward the pair of left and right rear wheel axles 34L and 34R. Specifically, the power transmission device 10 reaches the rear wheels 16L and 16R sequentially from the transmission 20 via the transfer 22, the rear propeller shaft 26, the rear wheel differential gear device 30, the rear wheel axles 34L and 34R, and the like. The power transmission path allows the power generated in the driving force source 12 to be transmitted to the rear wheels 16L and 16R. Further, the power transmission device 10 can configure a power transmission path that distributes and transmits part of the driving force transmitted from the driving force source 12 to the transfer 22 to the front wheels 14L, 14R. That is, by adjusting the connection state of a front wheel drive clutch 46, which will be described in detail later, the power transmission device 10 is configured to move from the transmission 20 through the transfer 22 to the front propeller shaft 24, the front wheel differential gear device 28, and the front wheel axle. A part of the power generated in the driving force source 12 can be transmitted to the front wheels 14L, 14R by the power transmission path reaching the front wheels 14L, 14R through 32L, 32R, etc. in sequence.

The transmission 20 operates by receiving an output from the driving force source 12, and is configured by, for example, a conventionally known MT (manual transmission), AT (automatic transmission), CVT (continuously variable transmission), or the like.

The transfer 22 includes an input shaft 38, a rear-wheel output shaft 40, a front-wheel drive drive sprocket 42, and a front-wheel drive clutch 46 (first clutch) around a first rotation axis C1. Further, the transfer 22 includes a front-wheel-side output shaft 48 and a driven sprocket 50 for driving the front wheels around a second rotation axis C2 extending in a direction (substantially parallel in this embodiment) to the first rotation axis C1. ing. Further, the transfer 22 has a front-wheel drive chain 52 wound around the front-wheel drive drive sprocket 42 and the front-wheel drive driven sprocket 50 .

Input shaft 38 is connected to transmission 20 . This allows the input shaft 38 to receive power transmitted from the driving force source 12 . Also, the rear wheel output shaft 40 is connected to the rear propeller shaft 26 so as to be capable of power transmission. The front-wheel drive drive sprocket 42 is supported by the rear-wheel output shaft 40 so as to be relatively rotatable with respect to the rear-wheel output shaft 40 .

By engaging the front-wheel drive clutch 46, the front-wheel drive drive sprocket 42 can rotate integrally with the rear-wheel output shaft 40, and power is transmitted to the front-wheel output shaft 48 via the front-wheel drive chain 52. It becomes possible. Therefore, by engaging the front-wheel drive clutch 46, part of the driving force transmitted from the driving force source 12 to the rear propeller shaft 26 via the rear-wheel output shaft 40 is distributed. 42 and the front wheel drive chain 52 to the front wheel side output shaft 48 . On the other hand, by disengaging the front-wheel drive clutch 46, the driving force transmitted from the driving force source 12 to the rear-wheel output shaft 40 is not transmitted (distributed) to the front-wheel drive drive sprocket 42. It can be transmitted to the rear propeller shaft 26 .

The front wheel drive clutch 46 is composed of, for example, a wet multi-plate clutch. The front-wheel drive clutch 46 can adjust the transmission torque transmitted from the rear-wheel output shaft 40 to the front-wheel drive drive sprocket 42 by adjusting the degree of engagement (degree of engagement). That is, the front wheel drive clutch 46 serves as a clutch for selectively disconnecting or connecting the power transmission path between the driving force source 12 and the front propeller shaft 24 functioning as a power transmission member to the front wheels 14L, 14R. Function.

The front-wheel output shaft 48 is connected to the front propeller shaft 24 so as to be able to transmit power. The front-wheel drive driven sprocket 50 is provided so as to be integrally rotatable with the front-wheel output shaft 48 . The front-wheel drive chain 52 is wound around the front-wheel drive drive sprocket 42 and the front-wheel drive driven sprocket 50 so that power can be transmitted between the two sprockets.

The front wheel differential gear device 28 comprises a differential case 80, a pinion shaft 82, a pair of side gears 84L, 84R, a pair of pinions 86a, 86b, and a ring gear 90. As shown in FIG. The pinions 86 a and 86 b are attached to the differential case 80 while being arranged on both ends of the pinion shaft 82 . The side gears 84L, 84R are arranged to face each other inside the differential case 80 and mesh with the pinions 86a, 86b, respectively. The side gears 84L, 84R are connected to the front wheels 14L, 14R via front wheel axles 32L, 32R. Also, the ring gear 90 is integrally attached to the differential case 80 . A front drive pinion 25 connected to the front propeller shaft 24 is meshed with the ring gear 90 . The front-wheel differential gear device 28 also includes a dog clutch 94 (second clutch). The dog clutch 94 can be engaged by applying pressure (negative pressure). The dog clutch 94 selectively disconnects or connects the power transmission path between the front propeller shaft 24, which functions as a power transmission member to the front wheels 14L, 14R, and the front wheel axles 32L, 32R, which are auxiliary drive wheels. It functions as a two-clutch.

The rear wheel differential gear device 30 comprises a differential case 120, a pinion shaft 122, a pair of side gears 124L and 124R, a pair of pinions 126a and 126b, and a ring gear . The pinions 126a and 126b are attached to the differential case 120 while being arranged at both ends of the pinion shaft 122, respectively. The side gears 124L, 124R are arranged to face each other inside the differential case 120 and mesh with the pinions 126a, 126b, respectively. The side gears 124L, 124R are connected to the rear wheels 16L, 16R via rear wheel axles 34L, 34R. Also, the ring gear 130 is integrally attached to the differential case 120 . A rear drive pinion 27 connected to a rear propeller shaft 26 is meshed with the ring gear 130 .

Since the vehicle V is configured as described above, when both the front wheel drive clutch 46 and dog clutch 94 are connected (engaged) so that torque can be transmitted, only the rear wheels 16L and 16R are engaged. Instead, the front wheels 14L and 14R are also in a state (four-wheel drive state) in which the power generated by the driving force source 12 can be transmitted. On the other hand, in the vehicle V, when either the front wheel drive clutch 46 or dog clutch 94 is disengaged (disengaged), the power transmission path to the front wheels 14L, 14R is cut off, and torque cannot be transmitted. become. As a result, the vehicle V can transmit the power generated by the driving force source 12 to the rear wheels 16L and 16R, but cannot transmit the power to the front wheels 14L and 14R (two-wheel drive state).

The control device 100 can control the connected state (engaged state) of the front wheel drive clutch 46 and dog clutch 94 described above. The control device 100 includes, for example, a microcomputer having a CPU, RAM, ROM, input/output interface, and the like. The control device 100 includes a first clutch control section 102 (first clutch control section) and a second clutch control section 104 .

The first clutch control section 102 controls transmission torque (degree of engagement of the first clutch) transmitted to the front propeller shaft 24 via the front wheel drive clutch 46 . The first clutch control section 102 controls the degree of engagement based on the engagement pressure of the front wheel drive clutch 46 . As described above, in this embodiment, the front wheel drive clutch 46 is a wet multi-plate clutch that can adjust the degree of engagement (engagement pressure) by controlling the magnitude of the hydraulic pressure. Therefore, the first clutch control unit 102 can control the magnitude of torque transmitted to the front propeller shaft 24 by controlling the magnitude of the hydraulic pressure acting on the front wheel drive clutch 46 .

The second clutch control section 104 controls torque transmission from the front wheel drive clutch 46 to the front wheel differential gear device 28 by controlling the operation of the dog clutch 94 . As described above, the dog clutch 94 can be engaged by applying pressure (negative pressure). Therefore, the second clutch control section 104 can switch the dog clutch 94 between the engaged state and the disengaged state by controlling the magnitude of the pressure acting on the dog clutch 94 .

<<Regarding the Characteristic Configuration of the Power Transmission Device 10>>
Next, the characteristic configuration of the power transmission device 10 described above will be described in detail with reference to the drawings.

The power transmission device 10 transmits the power input from the driving force source 12 in the vehicle V. As shown in FIG. As shown in FIGS. 1 and 2 , the power transmission device 10 accommodates a transmission 20 and a transfer 22 forming a power transmission mechanism 18 inside a housing case 200 . The housing case 200 is formed by connecting a first case portion 210, a second case portion 212, and a third case portion 214. As shown in FIG.

As shown in FIGS. 1 and 2, the first case portion 210 is a portion that accommodates therein the transmission 20 to which the power output from the driving force source is input. Further, the first case portion 210 has an oil pan 210a (not shown in FIG. 2) and a strainer 210b at its bottom.

The second case portion 212 is connected to the first case portion 210 . In this embodiment, the second case portion 212 is connected to the first case portion 210 at a position on the rear side of the vehicle V. As shown in FIG. The second case portion 212 accommodates a device that operates by being supplied with lubricating oil. In this embodiment, the second case portion 212 accommodates a front-wheel drive clutch 46 (clutch) to which power output from the transmission 20 is input. Further, the second case portion 212 accommodates a solenoid valve 46a (clutch operating device) for operating the front wheel drive clutch 46. As shown in FIG. In the second case portion 212 , the oil used for lubricating the front wheel drive clutch 46 drops from the front wheel drive clutch 46 side to the bottom side of the second case portion 212 . A harness 230 routed inside the housing case 200 is connected to the solenoid valve 46a.

The third case portion 214 is connected to the second case portion 212 on the side opposite to the first case portion 210 . In this embodiment, the third case portion 214 is connected to the second case portion 212 at a position on the rear side of the vehicle V. As shown in FIG. The third case portion 214 accommodates the transfer 22 .

The housing case 200 is formed by connecting the above-described first case portion 210, second case portion 212, and third case portion 214 in this order. A cylindrical portion 220 as shown in FIG. 4 is provided inside the housing case 200 . The tubular portion 220 is formed in a tubular shape so as to connect the first opening 222 and the second opening 224 provided in the storage case 200 . The cylindrical portion 220 is formed over the entire circumference of the first opening 222 and the second opening 224 (see FIG. 5).

The first opening 222 opens at a position on the first case portion 210 side in the connection direction X between the first case portion 210 and the second case portion 212 . First opening 222 is formed to open at a boundary portion between first case portion 210 and second case portion 212 . The first opening 222 can be provided, for example, at the end of the first case portion 210 on the second case portion 212 side, or at the end of the second case portion 212 on the first case portion 210 side. . In this embodiment, the first opening 222 is provided at the end of the first case portion 210 on the second case portion 212 side.

As shown in FIGS. 3 and 4, the second opening 224 is positioned opposite to the above-described first opening 222 in the connecting direction X between the first case portion 210 and the second case portion 212. It is open to The second opening 224 opens in the second case portion 212 at a position on the third case portion 214 side. Further, as shown in FIG. 3 , the second opening 224 opens to the front wheel drive clutch 46 provided in the second case portion 212 at a position on the bottom side of the second case portion 212 .

As shown in FIG. 4 , the cylindrical portion 220 is arranged inside the second case portion 212 so as to connect the first opening portion 222 and the second opening portion 224 . It is formed so as to extend in the connection direction X with the portion 212 (the front-rear direction of the vehicle V in this embodiment). In the tubular portion 220 , the opening area of the first opening 222 is formed to be larger than the opening area of the second opening 224 . A part or the whole (substantially the whole in this embodiment) of the cylindrical part 220 is formed so as to slope downward from the second opening 224 side toward the first opening part 222 side.

A part or the whole of the tubular portion 220 is formed so that the cross-sectional area decreases from the first opening 222 side toward the second opening 224 side. In this embodiment, there is a portion (enlarged portion 226) in which the cross-sectional area increases from the first opening 222 side toward the second opening portion 224 side in the middle portion in the extending direction of the cylindrical portion 220. In the region closer to the first opening 222 than the enlarged portion 226 and in the portion closer to the second opening 224 than the enlarged portion 226, the cross-sectional area increases from the first opening 222 toward the second opening 224. formed to decrease.

The cylindrical portion 220 constitutes a routing path through which a harness 230 connected to a solenoid valve 46a for operating the front wheel drive clutch 46 is routed. Since the cylindrical portion 220 has the shape described above, it functions as a guide for the harness 230 when the harness 230 is routed. Therefore, for example, by connecting the first case portion 210 and the second case portion 212 and assembling devices such as the transmission 20, the front-wheel drive clutch 46, and the solenoid valve 46a, the first opening portion 222 side can be opened. Even if the second opening 224 cannot be visually recognized, the harness 230 can be easily reached to the second opening 224 by inserting the harness 230 from the first opening 222 side.

A second opening 224 of the cylindrical portion 220 opens to the front wheel drive clutch 46 at a position on the bottom side of the second case portion 212 . Therefore, in the second case portion 212, the cylindrical portion 220 takes in the oil that has fallen after lubricating the front-wheel drive clutch 46 through the second opening portion 224, and the oil pan 210a provided in the first case portion 210 is fed into the oil pan 210a. serves as an oil return path for returning oil to the Further, the tubular portion 220 is formed so as to slope downward from the second opening portion 224 side toward the first opening portion 222 side. Therefore, the cylindrical portion 220 can smoothly move the oil taken in from the second opening portion 224 from the second case portion 212 side toward the first case portion 210 side.

The power transmission device 10 of this embodiment has the characteristic configuration as described above. Therefore, the power transmission device 10 can exhibit the following effects (a) to (h), for example.

(a) The power transmission device 10 of the present embodiment has an opening on the side of the first case portion 210 in the connecting direction X of the first case portion 210 and the second case portion 212 forming the housing case 200 that houses the power transmission mechanism 18. and a cylindrical portion 220 that connects a first opening 222 that opens to the first opening 222 and a second opening 224 that opens on the side opposite to the connection direction X with respect to the first opening 222 . Therefore, in the power transmission device 10 of the present embodiment, the harness 230 is inserted into the tubular portion 220 through the first opening 222, and the harness 230 is pushed along the tubular portion 220, or in the opposite direction. By pushing the harness 230 , the harness 230 can be routed from the first opening 222 to the second opening 224 . In this manner, the power transmission device 10 of the present embodiment is configured to perform wiring work of the harness 230 using the cylindrical portion 220 as a guide. Therefore, in the power transmission device 10 of the present embodiment, the harness 230 can be easily routed inside the housing case 200 that houses the power transmission mechanism 18 regardless of the operator's skill level or the like.

(b) In the power transmission device 10 of the present embodiment, the first case portion 210 has the oil pan 210a, and is provided from the second case portion 212 to the first case portion 210 by the cylindrical portion 220. An oil return path for returning oil to the oil pan 210a can be formed. Therefore, in the power transmission device 10, the cylindrical portion 220 provided in the housing case 200 functions as a routing path for the harness 230, and in addition, the oil pan provided from the second case portion 212 to the first case portion 210. It can be utilized as having a function as an oil return path for returning oil to 210a. As a result, the power transmission device 10 can simplify the device configuration by that much without separately providing a configuration for configuring the oil return path. In addition, since the power transmission device 10 is provided with an oil return path, the oil is prevented from stagnation in the second case portion 212, and the oil smoothly flows into the oil pan 210a on the first case portion 210 side. can be returned. As a result, it is possible to suppress the amount of oil required in the power transmission device 10 and suppress the occurrence of air suction in the strainer.

(c) In the power transmission device 10 of the present embodiment, part or all of the cylindrical portion 220 is formed to slope downward from the second opening 224 side toward the first opening 222 side. . As a result, the power transmission device 10 can smoothly discharge oil or the like that has entered the cylindrical portion 220 toward the first opening portion 222 side. As described above, when the cylindrical portion 220 is used as an oil return path for returning oil from the second case portion 212 to the first case portion 210, the retention of oil inside the cylindrical portion 220 is suppressed. Then, the oil can be smoothly returned to the first case portion 210 side.

(d) In the power transmission device 10 of the present embodiment, the opening area of the first opening 222 is larger than the opening area of the second opening 224 . Accordingly, in the power transmission device 10, it is easy to insert the harness 230 into the cylindrical portion 220 from the first opening 222 side, and the harness 230 is removed from the cylindrical portion 220 on the second opening 224 side. It is assumed that the position can be determined with high accuracy.

(e) The power transmission device 10 of the present embodiment is formed such that part or all of the cylindrical portion 220 has a cross-sectional area that decreases from the side of the first opening 222 toward the side of the second opening 224. Therefore, the harness 230 inserted into the tubular portion 220 from the first opening 222 side is smoothly guided to the position provided in the second opening 224 toward the second opening 224. be able to. Thereby, the power transmission device 10 can further improve workability for routing the harness 230 from the first opening 222 to the second opening 224 .

(f) In the power transmission device 10 of the present embodiment, the front-wheel drive clutch 46, which is a device to which lubricating oil is supplied, is housed inside the second case portion 212, and lubrication of the front-wheel drive clutch is performed. Used oil drops from the front wheel drive clutch side to the bottom side of the second case portion 212 , and the second opening 224 is located on the bottom side of the second case portion 212 with respect to the front wheel drive clutch 46 . It is open at As a result, the power transmission device 10 can smoothly take oil that has fallen to the bottom side of the second case portion 212 into the tubular portion 220 after being used for lubricating the front wheel drive clutch 46 . Therefore, the power transmission device 10 can effectively utilize the cylindrical portion 220 provided in the housing case 200 as a path for smoothly returning oil from the second case portion 212 side to the first case portion 210 side.

(g) In the power transmission device 10 of the present embodiment, the first case portion 210 accommodates the transmission 20 to which the power output from the driving force source 12 is input, and the second case portion 212 accommodates the speed change A front-wheel drive clutch 46 to which power output from the machine 20 is input, and a solenoid valve 46a for operating the front-wheel drive clutch 46 are accommodated, and a harness 230 is connected to the solenoid valve 46a. It is assumed. As a result, even when the transmission 20 is assembled to the first case portion 210 and the front wheel drive clutch 46 and the solenoid valve 46a are assembled to the second case portion 212, the harness 230 can be easily attached inside the housing case 200. It can be routed.

(h) In the power transmission device 10 of the present embodiment, the housing case 200 further includes a third case portion 214 connected to the second case portion 212 on the side opposite to the first case portion 210. The first case portion 210 accommodates the transmission 20 to which the power output from the driving force source 12 is input, and the third case portion 214 accommodates the transfer 22 . In addition, the power transmission device 10 operates the front wheel drive clutch 46 that selectively disconnects or connects the power transmission path between the transmission 20 and the transfer 22 and the front wheel drive clutch 46 in the second case portion 212. It accommodates a solenoid valve 46a for this purpose. With such a configuration, it is possible to easily route the harness 230 in the power transmission device 10 used in a four-wheel drive vehicle such as the vehicle V described above.

<<Modification>>
The power transmission device 10 exemplified in the above embodiment is merely an example of one embodiment of the present invention, and its configuration can be appropriately changed or omitted without departing from the gist of the present invention.

Specifically, in the present embodiment, an example is shown in which the cylindrical portion 220 is used to form an oil return path for returning oil from the second case portion 212 to the oil pan 210a provided in the first case portion 210. However, the present invention is not limited to this. Specifically, it is possible to form the second opening 224 on the upper side of the second case portion 212 so as to make it difficult for the oil to flow into the cylindrical portion 220 .

In the power transmission device 10 of this embodiment, part or all of the cylindrical portion 220 is formed so as to slope downward from the second opening 224 side toward the first opening 222 side. The invention is not limited to this. For example, the power transmission device 10 may have the cylindrical portion 220 provided substantially horizontally, or may be formed so as to slope downward from the first opening portion 222 side toward the second opening portion 224. .

In the power transmission device 10 of this embodiment, the opening area of the first opening 222 is larger than the opening area of the second opening 224, but the invention is not limited to this. For example, in the power transmission device 10, the opening areas of the first opening 222 and the second opening 224 are substantially the same, or the opening area of the second opening 224 is larger than the opening area of the first opening 222. It may be a large one. In the power transmission device 10, the opening area of the second opening 224 is larger than the opening area of the first opening 222, so that oil can be easily taken into the cylindrical portion 220 through the second opening 224. expected to be effective.

The power transmission device 10 of the present embodiment has an enlarged portion 226 in the intermediate portion of the cylindrical portion 220, and the first opening portion 222 side and the second opening portion 224 side of the enlarged portion 226 have first openings. Although the cylindrical portion 220 is formed so that the cross-sectional area decreases from the portion 222 side toward the second opening portion 224 side, the present invention is not limited to this. The cylindrical portion 220 may be formed so that the cross-sectional area decreases from the first opening 222 side to the second opening 224 side over the entirety, or the cross-sectional area changes over the entirety. Alternatively, the cross-sectional area may decrease from the second opening 224 side toward the first opening 222 side, contrary to the above embodiment.

Although the power transmission device 10 of the present embodiment accommodates the front wheel drive clutch 46 as a device to which lubricating oil is supplied inside the second case portion 212, the present invention is limited to this. Instead of the front-wheel drive clutch 46, or in addition to the front-wheel drive clutch 46, another device to which lubricating oil is supplied may be accommodated. Further, in the power transmission device 10, the second opening 224 opens toward the front-wheel drive clutch 46 on the bottom side of the second case portion 212, and the oil used for lubricating the front-wheel drive clutch 46 is supplied. Although an example in which collection is possible from the second opening 224 to the tubular portion 220 has been shown, the present invention is not limited to this. As described above, the power transmission device 10 may be configured such that the second opening 224 is provided at a position such as the upper side of the second case portion 212 where oil is less likely to flow.

In the power transmission device 10 of the present embodiment, the harness 230 connected to the solenoid valve 46a for operating the front wheel drive clutch 46 is routed using the cylindrical portion 220. The invention is not limited to this. In the power transmission device 10, in addition to or instead of the harness 230 connected to the solenoid valve 46a, a harness connected to other equipment or the like may be routed using the cylindrical portion 220. It is possible.

In the power transmission device 10 of the present embodiment, the first case portion 210 accommodates the transmission 20 to which the power output from the driving force source 12 is input, and the third case portion 214 accommodates the transfer 22. However, the present invention is not limited to this. The power transmission device 10 may be mounted on a four-wheel drive vehicle that does not include the third case portion 214 and the transfer 22, for example.

The present invention is not limited to the above-described embodiments, modifications, and the like, and other embodiments are possible in accordance with the teachings and spirit of the claims without departing from the scope of the claims. The constituent elements of the above-described embodiments may be arbitrarily selected and combined. Any component of the embodiment and any component described in the means for solving the invention or a component embodying any component described in the means for solving the invention may be arbitrarily combined. may be configured We intend to acquire the rights for these as well in the amendment of the present application or in a divisional application.

The present invention includes a first clutch that selectively disconnects or connects a power transmission path between a driving force source and a power transmission member, and a power transmission path that selectively disconnects a power transmission path between the power transmission member and a sub-driving wheel. Alternatively, it can be suitably used in general controllers for four-wheel drive vehicles having a connected second clutch.

10: Power Transmission Device 12: Driving Power Source 18: Power Transmission Mechanism 20: Transmission 22: Transfer 46: Front Wheel Drive Clutch (Equipment)
46a: Solenoid valve (clutch actuator)
200: storage case 210: first case portion 210a: oil pan 212: second case portion 214: third case portion 220: cylindrical portion 222: first opening 224: second opening 230: harness V: vehicle X : Connection direction

Claims (3)

A power transmission device for transmitting power input from a driving force source in a vehicle,
a housing case housing the power transmission mechanism;
a harness routed inside the storage case,
The storage case includes a first case portion and a second case portion connected to the first case portion, and is on the first case portion side in a connection direction of the first case portion and the second case portion. and a tubular portion formed in a tubular shape so as to connect a first opening that opens to the first opening, and a second opening that opens on the opposite side of the connecting direction with respect to the first opening,
A power transmission device, wherein the harness is routed in the connection direction through the cylindrical portion. The first case portion has an oil pan,
2. The power transmission according to claim 1, wherein the cylindrical portion can form an oil return path for returning oil from the second case portion to the oil pan provided in the first case portion. Device. 3. The cylindrical portion according to claim 1 or 2, wherein part or all of said cylindrical portion is formed so as to slope downward from said second opening side toward said first opening side. power transmission device.

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