JP7236399B2 - Lubrication structure of driving force transmission device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a lubricating structure of a driving force transmission device in which a casing containing a plurality of rotating shafts and gears is lubricated with oil scooped up by the rotation of the gears.

2. Description of the Related Art As a lubricating structure provided in a transmission (driving force transmission device) such as an automatic transmission mounted on a vehicle, there is a lubricating structure described in Patent Document 1. In this lubricating structure, in a transmission that houses a plurality of rotating shafts and gears in a casing, the oil accumulated at the bottom of the casing is scraped up by a differential gear (final gear for the final reduction gear), Lubrication is supplied to parts that require lubrication, such as bearings, via other gears placed in the

In transmissions such as those described above, effective lubrication can be achieved by efficiently supplying oil to bearings and other areas that require lubrication without increasing the number of parts or complicating the structure. It is necessary to

Further, in the transmission as described above, a hydraulic control device called a control body for performing shift control by hydraulic pressure is installed in the casing. As a structure for holding a pipe that communicates from the control body to other locations, a portion of the pipe may be held in contact with or in close proximity to the casing. However, in this structure, there is a possibility that the pipe itself may be worn due to the contact of the pipe with the casing or contact with the adjacent portion due to the vibration of the vehicle or the vibration of the pipe itself due to the oil flowing through the pipe. On the other hand, Patent Document 2 discloses a configuration in which a groove is formed on the casing side to suppress the vibration of the pipe. However, in order to form the casing side grooves using a mold or the like as in Patent Document 2, the parts must be manufactured with high precision, and there are problems such as an increase in the cost associated with the processing of the parts. .

Further, the transmission as described above is provided with a breather structure for adjusting the temperature and pressure within the casing. This breather structure is configured to ventilate the inside of the casing by providing a through hole in the casing or installing a pipe (breather pipe) that communicates with the outside. In this case, in the above breather structure, high-temperature and high-pressure oil may blow out of the casing from the through-holes and pipes depending on conditions such as the position and orientation of the through-holes and pipes.

In addition, when a breather structure is installed in the casing of the transmission, there are cases where the oil that is scooped up by the gears scatters around the breather structure and its surroundings. Therefore, it is necessary to take measures to prevent the oil from spurting out of the through-holes and pipes of the breather structure.

JP 2007-159314 A JP 2013-213515 A

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and its object is to effectively distribute the oil scraped up by the gears to the parts in the casing that require lubrication with a simple structure without increasing the number of parts. lubrication of a driving force transmission device capable of effectively suppressing wear of a contacting portion of a pipe, and suppressing ejection of oil in a casing to the outside through a breather structure It is to provide structure.

In order to solve the above-described problems, a lubricating structure for a driving force transmission device according to the present invention provides a driving force transmission device (1) for transmitting a driving force from a driving source of a vehicle, comprising: a casing (2); ) for controlling the hydraulic pressure of the oil supplied from the oil supply source to the oil supply target in the casing (2), the hydraulic control device (5) and other An oil supply member (10) connecting with a device (18), a first rotating shaft (62) arranged in the casing (2) and a first gear (72) on the first rotating shaft (62) ), a breather chamber (20) formed in the casing (2), and an opening (22) provided on the lower surface side of the breather chamber (20), the oil supply member (10) At least part of it is arranged between the hydraulic control device (5) and the inner surface (2c) of the casing (2), below the opening (2) and above the first gear (72). It is characterized by being arranged on the upper side.

According to the lubricating structure of the driving force transmission device according to the present invention, the following effects can be obtained.
[1] At least part of the oil supply member is arranged below the opening of the breather chamber, so that at least part of the oil dripping (flowing down) from the opening of the breather chamber is transferred to the outer surface of the oil supply member. can be conveyed. As a result, it is possible to effectively suppress wear due to contact between the oil supply member and the inner surface of the casing due to vibration caused by the oil flowing through the oil supply member.
[2] Since at least part of the oil supply member is arranged above the first gear, the oil scattered by the rotation of the first gear can be splashed on the outer surface of the oil supply member. As a result, wear due to contact between the oil supply member and the casing can be more effectively suppressed.
[3] As described above, the wear due to contact between the oil supply member and the casing can be effectively suppressed. can be set short (the gap between them can be made small). Therefore, it is possible to reduce the size of the driving force transmission device and optimize the layout of the components inside the casing.

Further, in the lubricating structure of the driving force transmission device, the second rotating shaft (61) arranged in the casing (2), the second gear (71) on the second rotating shaft (61), and the breather an extension wall (25) formed by extending a part of the wall (21b) forming the chamber (20), the extension wall (25) extending toward the hydraulic control device (5) reaching the outer surface (5a) of the hydraulic control device (5), the extension wall (25) and the hydraulic control device (5) are located above the center (71b) of the second gear (71) At least part of the oil supply member (10) may be arranged above the outer peripheral surface (71a) of the second gear (71).

According to this configuration, the oil splashed by the rotation of the first gear collides with the extension wall and the hydraulic control device, so that the oil is transmitted through the extension wall and the hydraulic control device and guided toward the bearing that supports the second gear. can do. Further, since the oil supply member is also arranged above the second gear, part of the oil that has lubricated the oil supply member also falls toward the bearing that supports the second gear. These can effectively lubricate the bearings that support the second gear.

In addition, in the lubricating structure of the driving force transmission device, the extension wall (25) is positioned closer to the first gear (72) than the opening (22) of the breather chamber (20). 72).

According to this configuration, since the extension wall is arranged at a position closer to the first gear than the opening of the breather chamber with respect to the first gear, the oil (stirring oil) scattered by the rotation of the first gear is scraped off by the extension wall, it is possible to suppress the inflow of oil from the opening into the breather chamber, thereby reducing the inflow amount. As a result, it is possible to effectively reduce the risk of the oil in the casing blowing out through the breather chamber.

In addition, in the lubricating structure of the driving force transmission device, the outer surface (5a) of the hydraulic control device (5) to which the extension wall (25) reaches is designed to connect the second gear (71) to the casing (2). It is preferably arranged above the supporting bearings (8, 9).

According to this configuration, the oil dripping from the lower end along the outer surface of the hydraulic control device is supplied to the bearing of the second gear positioned below. Therefore, the bearing of the second gear can be lubricated more effectively.
It should be noted that the symbols in parentheses above indicate the symbols of the constituent elements in the embodiment described later as an example of the present invention.

According to the lubricating structure of the driving force transmission device according to the present invention, the oil scattered by the rotation of the first gear can be effectively guided to the parts in the casing that require lubrication with a simple structure without increasing the number of parts. In addition, it is possible to effectively suppress wear of the contacting portion of the oil supply member, and to suppress the oil in the casing from being ejected to the outside through the breather chamber.

1 is a schematic side sectional view showing a transmission (driving force transmission device) having a lubricating structure according to an embodiment of the present invention; FIG. FIG. 2 is a cross-sectional view taken along the line XX of FIG. 1; It is a partial enlarged view showing a part of the upper side of the transmission. FIG. 4 is a partially enlarged perspective view showing a D portion of FIG. 3; FIG. 4 is a ZZ cross-sectional view of FIG. 3; 4 is a cross-sectional view taken along line YY of FIG. 3; FIG. FIG. 4 is a diagram for explaining the flow of oil within the casing;

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a schematic side cross-sectional view showing an example of the overall configuration of a transmission (driving force transmission device) having a lubricating structure according to one embodiment of the present invention. 2 is a cross-sectional view taken along the line XX of FIG. 1. FIG. A transmission (driving force transmission device) 1 shown in FIG. A hydraulic control body (hydraulic control device) 5 arranged above the gear mechanism 3 in the casing 2 and an oil pipe (oil supply member) connecting the hydraulic control body 5 and another device 18 provided outside the casing 2. 10. The gear mechanism 3 includes a plurality of rotating shafts 60 (input shaft 61, driven shaft (counter shaft) 62, differential shaft 63) arranged parallel to each other, and a plurality of gears 70 ( An input gear 71 , a driven gear 72 , and a ring gear 73 ) are rotatably installed around the respective rotating shafts 60 .

1 is a cross section (C-C ) is shown. In FIG. 1, detailed illustration of components other than the gear mechanism 3, the hydraulic control body 5, the oil pipe 10, and the like, which are provided in the transmission 1, is omitted.

An input gear (second gear) 71 is installed on the input shaft (second rotating shaft) 61 for changing the speed of rotation due to the driving force input to the input shaft 61. A driven gear (first gear) 72 is installed on the differential shaft 62 , and a ring gear 73 is installed on the differential shaft 63 .

The hydraulic control body 5 is a device including a hydraulically operated variable speed valve and the like, and is installed on the upper side portion (upper left side portion as viewed in FIG. 1) within the casing 2 . The hydraulic control body 5 communicates through an oil pipe 15 with a communication hole 16 arranged below in the casing 2 . Furthermore, although detailed illustration is omitted, the communication hole 16 communicates with an oil strainer 17 installed in an oil reservoir provided in the bottom portion 2 b of the casing 2 . As a result, oil supplied from an oil pump (not shown) as an oil supply source and discharged from the other hydraulic control body 16 is sent to the hydraulic control body 5 via the oil pipe 15 .

FIG. 3 is a partial enlarged view showing a part of the upper side of the transmission 1, and is a view showing a BB cross section in FIG. 2 at the part corresponding to the symbol A in FIG. As shown in the figure, a breather chamber 20 for ventilating the inside of the casing 2 is provided above the hydraulic control body 5 inside the casing 2 . The breather chamber 20 is a space within the casing 2 separated from other spaces within the casing 2 by a partition wall 21 formed of a portion of the casing 2 . A breather pipe 24 is attached to the breather chamber 20 . The breather pipe 24 is installed so as to pass through the casing 2 with its axial direction directed vertically. An exhaust end 24b is located outside the breather chamber 20 and casing 2 .

As shown in FIG. 3, the partition wall 21 of the breather chamber 20 includes a first side wall portion 21a along the left side surface (surface facing the hydraulic control body 5) of the breather chamber 20 when viewed from the axial direction, and a lower wall portion 21c along the lower surface of the breather chamber 20 . The second side wall portion 21b is formed in an inclined surface shape that gradually approaches the hydraulic control body 5 from the upper end side to the lower end side when viewed in the axial direction.

FIG. 4 is a partially enlarged perspective view showing part D in FIG. As shown in the figure, an extended wall 25 is formed on the lower side of the breather chamber 20 by extending the second side wall portion 21b toward the hydraulic control body 5 (in a diagonally lower left direction). The extension wall 25 is a part of the flywheel case 2B, and as shown in FIGS. It is a wall with a cross-sectional shape that forms a straight plane. The surfaces of the second side wall portion 21b and the extended wall 25 are arranged along the upper side of the outer peripheral surface 72a of the driven gear 72 in the casing 2 (at a position surrounding a part of the upper side of the outer peripheral surface 72a of the driven gear 72). ing.

Further, as shown in FIG. 3 , the surface of the extension wall 25 continues to the right side surface 5 a of the hydraulic control body 5 . That is, the surface of the extension wall 25 is a surface extending in the lower left direction when viewed from the front side in the axial direction, and is continuous with the surface of the right side surface 5 a of the hydraulic control body 5 .

Also, an oil pipe 10 connecting the hydraulic control body 5 and another device 18 is arranged. In FIG. 3, the oil pipe 10 is shown in a partial cross-sectional view with a portion of the oil pipe 10 cut off from the hydraulic control body 5 side. to another device 18. One end of the oil pipe 10 is connected to a connecting portion 10a provided on the surface of the hydraulic control body 5 on the front side in the axial direction. It extends upwardly to the right within the casing 2 through adjacent locations and is connected at its end to other devices 18 outside the casing 2 . Accordingly, a portion of the oil pipe 10 is arranged on the lower right side of the breather chamber 20 and is arranged at a position facing the second side wall portion 21 b and the extension wall 25 . Note that the oil pipe 10 is composed of two pipes extending in substantially the same direction.

Further, as shown in FIG. 2, the oil pipe 10 is arranged between the hydraulic control body 5 and the transmission case 2A when viewed in the lateral direction with respect to the axial direction of the rotating shaft 60, and part of it is located in the transmission. It is arranged at a position adjacent to the side wall (inner surface) 2c of the case 2A. Specifically, the side surface 10c of the portion closest to the side wall 2c of the transmission case 2A is adjacent to the side wall 2c of the transmission case 2A. The dimension of the clearance L between the side wall 2c of the transmission case 2A and the side surface 10c of the oil pipe 10 at this position is determined by the vibration of the oil pipe 10 caused by the oil flowing through the oil pipe 10. 10c is a distance that can contact the side wall 2c of the transmission case 2A. In FIG. 2, the oil pipe 10 is also shown in a partially cutaway state.

Further, as shown in FIGS. 3 and 4 , an opening 22 communicating with the breather chamber 20 is formed in the lower wall portion 21 c of the breather chamber 20 . The opening 22 is a substantially rectangular through-hole formed in a part of the lower wall 21c and opens downward from the breather chamber 20 . The opening 22 is for discharging oil that has flowed into the breather chamber 20 . In the transmission 1 of this embodiment, a small amount of oil flows into the breather chamber 20 from mating surfaces between the transmission case 2A and the flywheel case 2B. Therefore, the opening 22 is required to discharge the oil that has flowed into the breather chamber 20 to the outside (into the casing 2).

As shown in FIG. 3, the opening 22 is positioned above the extension wall 25 within the casing 2, and as shown in FIG. It is located on the back side (remote side) of the extension wall 25 with respect to 71a. That is, the extension wall 25 is arranged in front of the opening 22 with respect to the outer peripheral surface 72 a of the driven gear 72 and the outer peripheral surface 71 a of the input gear 71 in the casing 2 .

FIG. 5 is a ZZ sectional view of FIG. As shown in FIGS. 3 and 5, the right side surface 5a of the hydraulic control body 5 is arranged above the input shaft 61 and the input gear 71, and is interposed between the input shaft 61 and the input gear 71. It is arranged above the bearings 8 and 9 that That is, the bearings 8 and 9 are arranged on an extension line (on an extension line extending downward) of the surface of the right side surface 5a of the hydraulic control body 5 when viewed from the front side in the axial direction. The bearing 8 is a bearing that rotatably supports the input gear 71 on the input shaft 61, and the bearing 9 is a bearing that rotatably supports the input shaft 61 with respect to the flywheel case 2B. Therefore, the input gear 71 is rotatably supported by the bearings 8 and 9 with respect to the flywheel case 2B. A part of the oil pipe 10 (specifically, the part facing the extension wall 25 thereof) is also arranged above the bearing 8 .

Next, the flow of oil due to the rotation of gear 70 in casing 2 in transmission 1 having the above configuration will be described. 6 is a cross-sectional view taken along the line YY of FIG. 3. FIG. In the casing 2 of the transmission 1, the rotation of the ring gear 73 on the differential shaft 63 scoops up oil accumulated in the bottom portion 2b of the casing 2. As shown in FIG. As the driven gear 72 rotates, the scooped up oil scatters upward within the casing 2 . As shown in FIG. 6, the oil supplied to the bearing 11 supporting the driven gear 72 on the driven shaft 62 is sent upward along the inner surface of the flywheel case 2B as the driven gear 72 rotates. Then, as shown in FIG. 3, part of the oil scattered by the rotation of the driven gear 72 hits the second side wall portion 21b of the breather chamber 20 and the extension wall 25 therebelow. As shown in FIG. 5, this oil flows downward along the second side wall portion 21b and the extension wall 25, and further flows down along the side surface 5a of the hydraulic control body 5. As shown in FIG. The oil that has flowed down is supplied to the bearings 8 and 9 on the input shaft 61 below. In this manner, oil is supplied to the bearings 8 and 9 along the extension wall 25 and the side surface 5a of the hydraulic control body 5, so that the bearings 8 and 9 are lubricated.

FIG. 7 is a diagram for explaining the flow of oil due to the rotation of gear 70 in casing 2. As shown in FIG. As shown in the figure, part of the oil scattered by the rotation of the driven gear 72 collides with the extension wall 25 and is blocked by the extension wall 25 . This makes it difficult for the oil to reach the opening 22 of the breather chamber 20 located on the back side of the extension wall 25 . Therefore, it is possible to suppress the oil from flowing into the breather chamber 20 from the opening 22 , so that it is possible to prevent the oil from blowing out from the breather pipe 24 .

In addition, as shown in FIG. 3, a part of the oil pipe 10 is arranged below the opening 22 of the breather chamber 20, so that at least the oil dripping (flowing down) from the opening 22 of the breather chamber 20 is A part can be transmitted to the outer surface of the oil pipe 10 . As a result, wear due to contact between the oil pipe 10 and the casing 2 due to vibration caused by the oil flowing through the oil pipe 10 can be effectively suppressed.

Further, since a part of the oil pipe 10 is arranged above the driven gear 72 , the oil scattered by the rotation of the driven gear 72 can be splashed on the outer surface of the oil pipe 10 . This also makes it possible to more effectively suppress wear due to contact between the oil pipe 10 and the casing 2 .

Since the wear due to contact between the oil pipe 10 and the casing 2 can be effectively suppressed as described above, the distance between the casing 2 and the oil pipe 10 can be set small. Also, the length dimension of the oil pipe 10 can be set short. Therefore, it is possible to reduce the size of the transmission 1 and optimize the layout of the components inside the casing 2 .

As described above, the lubricating structure of the transmission 1 of the present embodiment includes the casing 2 and the hydraulic pressure of the oil arranged in the casing 2 and supplied from the oil pump to the oil supply target in the casing 2. , an oil pipe 10 connecting the hydraulic control body 5 and another device 18, a driven shaft 62 arranged in the casing 2 and a driven gear 72 on the driven shaft 62, the casing 2 A breather chamber 20 formed therein and an opening 22 provided on the lower surface side of the breather chamber 20 , and at least part of the oil pipe 10 extends between the hydraulic control body 5 and the side wall 2 c of the casing 2 . , and is arranged below the opening 2 and above the driven gear 72 .

In addition, in the lubrication structure of the transmission 1 of the present embodiment, the input shaft 61 arranged in the casing 2, the input gear 71 on the input shaft 61, and the second side wall portion 21b forming the breather chamber 20 are extended. The extension wall 25 extends toward the hydraulic control body 5 and its tip reaches the outer surface 5a of the hydraulic control body 5, and the extension wall 25 and the hydraulic control body 5 are , is arranged above the center 71 b of the driven gear 71 , and at least part of the oil pipe 10 is arranged above the outer peripheral surface 71 a of the input gear 71 .

According to this configuration, the oil splashed by the rotation of the driven gear 72 hits the extension wall 25 and the hydraulic control body 5, and the oil is transmitted through the extension wall 25 and the hydraulic control body 5 to support the input gear 71. 8, 9 can be guided. Since the oil pipe 10 is also arranged above the input gear 71 , part of the oil lubricating the oil pipe 10 also falls toward the bearings 8 and 9 supporting the input gear 71 . These can effectively lubricate the bearings 8 and 9 that support the input gear 71 .

Further, in the lubricating structure of the transmission 1 , the extension wall 25 is arranged at a position closer to the driven gear 72 than the opening 22 of the breather chamber 20 with respect to the driven gear 72 .

According to this configuration, since the extension wall 25 is arranged at a position closer to the driven gear 72 than the opening 22 of the breather chamber 20 with respect to the driven gear 72, the oil ( By scraping off the agitated oil) with the extension wall 25, the inflow of the oil from the opening 22 into the breather chamber 20 can be suppressed and the inflow amount can be reduced. As a result, it is possible to effectively reduce the possibility that the oil in the casing 2 will be ejected to the outside through the breather chamber 20 .

Further, in the lubricating structure of the transmission 1 , the outer surface 5 a of the hydraulic control body 5 to which the extension wall 25 reaches is arranged above the bearings 8 and 9 that support the input gear 71 .

According to this configuration, the oil dripping from the lower end along the outer surface of the hydraulic control body 5 is supplied to the bearings 8 and 9 of the input gear 71 below. Therefore, the bearings 8 and 9 of the input gear 71 can be lubricated more effectively.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and various modifications can be made within the scope of the technical ideas described in the claims, the specification and the drawings. Deformation is possible.

1 transmission (driving force transmission device)
2 Casing 2A Transmission case 2B Flywheel case 2a Mating surface 2b Bottom 2c Side wall (inner surface)
3 gear mechanism 5 hydraulic control body (hydraulic control device)
5a side (outer surface)
6 rotating shafts 8, 9 bearings (bearings)
10 oil pipe (oil supply member)
10a connecting portion 10c side surface 15 oil pipe 16 hydraulic control body 17 oil strainer 18 other device 20 breather chamber 21 partition wall 21a first side wall portion 21b second side wall portion 21c lower wall portion 22 opening portion 24 breather pipe 24a intake end 24b exhaust end 25 extension wall 60 rotating shaft 61 input shaft (second rotating shaft)
62 Driven shaft (first rotating shaft)
63 differential shaft 70 gear 71 input gear (second gear)
71a outer peripheral surface 72 driven gear (first gear)
72a outer peripheral surface 73 ring gear

Claims (5)

In a driving force transmission device that transmits driving force from a vehicle driving source,
a casing;
a hydraulic control device disposed within the casing for controlling the hydraulic pressure of oil supplied from an oil supply source to an oil supply target within the casing;
an oil supply member that connects the hydraulic control device and another device;
a first rotating shaft disposed within the casing and a first gear on the first rotating shaft;
a breather chamber formed within the casing;
an opening provided on the bottom side of the breather chamber;
a second rotating shaft disposed within the casing and a second gear on the second rotating shaft;
a bearing that supports the second gear;
an extension wall formed by extending a part of the wall forming the breather chamber;
with
At least a portion of the oil supply member is disposed between the hydraulic control device and the inner surface of the casing, below the opening, between the opening and the second gear, and at the first gear. It is placed above one gear,
the extension wall extends toward the hydraulic control device and reaches an outer surface of the hydraulic control device;
the extension wall and the hydraulic control device are arranged above the center of the second gear and the bearing;
At least part of the oil splashed by the rotation of the first gear hits the extension wall and the hydraulic control device , travels through the extension wall and the hydraulic control device , and is guided toward the bearing that supports the second gear. A lubricating structure for a driving force transmission device, characterized by: 2. Lubrication of a driving force transmission device according to claim 1, wherein said extension wall is arranged at a position closer to said first gear than said opening of said breather chamber with respect to said first gear. structure. 3. The driving force transmission device according to claim 1, wherein the outer surface of the hydraulic control device reached by the extension wall is arranged above a bearing that supports the second gear on the casing. lubrication structure. At least part of the oil supply member is arranged so that at least part of the oil flowing down from the opening of the breather chamber is transmitted to the outer surface of at least part of the oil supply member. A lubricating structure for a driving force transmission device according to any one of items 1 to 3. In a driving force transmission device that transmits driving force from a vehicle driving source,
a casing;
a hydraulic control device disposed within the casing for controlling the hydraulic pressure of oil supplied from an oil supply source to an oil supply target within the casing;
an oil supply member that connects the hydraulic control device and another device;
a first rotating shaft disposed within the casing and a first gear on the first rotating shaft;
a breather chamber formed within the casing;
an opening provided on the bottom side of the breather chamber;
with
At least part of the oil supply member is arranged with a slight gap from the inner surface of the casing,
the gap is a distance that allows the oil supply member to contact the inner surface of the casing thing due to vibration of the oil supply member;
At least part of the oil supply member is arranged between the hydraulic control device and the inner surface of the casing, and is arranged below the opening and above the first gear,
At least part of the oil supply member is arranged below the opening so that at least part of the oil flowing down from the opening of the breather chamber is transmitted to the outer surface of at least part of the oil supply member. A lubricating structure for a driving force transmission device, characterized in that:

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