JP2010216566A - Power transmission device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a power transmission device such as a differential gear device having a reduced size while securing inside circulation of lubricating oil. <P>SOLUTION: A differential 100 includes a ring gear 112, a driving pinion 114, a differential carrier 110 inside which a partition chamber 141 storing the ring gear 112 and a head 116 of the driving pinion 114 and reserving oil in the bottom and a partition chamber 142 storing a shaft part 115 of the driving pinion 114 are formed, a bearing part 120 provided in the differential carrier 110 at a space from the outer peripheral face of the shaft part 115 of the driving pinion 114 and formed to encircle the outer peripheral face of the shaft part 115 for partitioning the partition chamber 141 from the partition chamber 142, and an oil distributing device 190 connecting the bottom of the partition chamber 141 to the bottom of the partition chamber 142 for distributing the oil inside. The inner peripheral face of the bearing part 120 is formed with its diameter gradually larger as tending from the side of the partition chamber 142 toward the side of the partition chamber 141. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a power transmission device including a gear, and more particularly to a power transmission device in which the power transmission device is made compact.

  As a power transmission device mounted on a vehicle, a differential device, a vehicle transmission, and the like are widely known.

  For example, a vehicle transmission described in Japanese Patent Application Laid-Open No. 2008-144900 includes a transmission case, a lubricating oil reservoir formed in the transmission case, in which lubricating oil is stored, and lubricating oil in the transmission case. And a final gear in which the lower end portion is immersed. In the lubricating oil reservoir, a suction port is formed at the height of the lubricating oil surface at the initial stage. A lubricating oil tank is provided outside the transmission case, and the lubricating oil tank and the suction port are connected by a lubricating oil suction circuit. The vehicle transmission further includes a lubricating oil return circuit that allows the lubricating oil tank and the transmission case to communicate with each other, and a lubricating oil tank depressurizing unit that repeatedly depressurizes and releases the atmosphere in the lubricating oil tank.

  A differential apparatus described in Japanese Patent Application Laid-Open No. 2006-161957 includes an apparatus main body case, a pinion shaft that is rotatably provided in the apparatus main body case, and is connected to a propeller shaft, and a pinion provided on the pinion shaft, A ring gear meshing with the pinion and a differential case rotatably provided in the apparatus main body case together with the ring gear are provided. The pinion gear is rotatably provided in the apparatus main body case by a bearing portion.

  The rotation of the ring gear and the differential case scrapes up the oil in the apparatus main body case, and the oil is supplied to the bearing portion that rotatably supports the pinion shaft.

  The differential structure lubrication structure disclosed in Japanese Patent Application Laid-Open No. 2000-104808 includes a differential carrier, a differential cover attached to the differential carrier, a pinion shaft supported in the differential carrier via a bearing, and a differential carrier And a differential case pivotally supported by the bearing support portion. A boss portion is provided between the bearing support portions, and a lubricating oil chamber is formed inside the boss portion. Further, the deb carrier is formed with a hollow chamber portion located in an upper portion of the pinion shaft and a lubricating oil hole portion extending in a direction orthogonal to the pinion shaft and communicating with the hollow chamber portion.

  The differential carrier structure described in Japanese Utility Model Laid-Open No. 5-94564 includes a differential carrier, and a reduction gear device and a differential gear device accommodated in the differential carrier. The reduction gear device includes a drive pinion and a ring gear. The pinion shaft of the drive pinion is rotatably supported by a pinion shaft bearing provided in the differential carrier.

  In the differential carrier, oil pumped up by the ring gear is supplied to the pinion shaft bearing, and after being supplied to the pinion shaft bearing, a reflux port formed in front of the bearing, and downward through the reflux port. The return path provided is formed.

JP 2008-144900 A JP 2006-161957 A JP 2000-104808 A Japanese Utility Model Publication No. 5-94564

  However, in the vehicle transmission described in Japanese Patent Laid-Open No. 2008-144900, a lubricating oil tank or the like is provided outside the transmission case, and the size of the transmission itself is increased.

  Moreover, in the differential apparatus described in Japanese Patent Application Laid-Open No. 2006-161957, a supply path that guides the oil pumped up by the ring gear to the bearing portion is formed in the apparatus main body case. For this reason, the size of the apparatus main body case is increased. Along with this, the size of the differential device itself has also increased.

  In the differential structure lubrication structure described in Japanese Patent Laid-Open No. 2000-104808, a boss portion, a lubrication chamber portion, a hollow chamber portion, and the like are formed in the differential carrier, and the size of the differential carrier is large. It has become. Accordingly, the size of the differential gear device itself is increased.

  Also in the differential carrier structure described in Japanese Utility Model Publication No. 5-94564, a return path or the like is formed in the differential carrier, and the size of the differential carrier and the differential carrier device itself is increased.

  The present invention has been made in view of the above-described problems, and an object thereof is to reduce the size of a power transmission device such as a differential gear device while ensuring the circulation of internal lubricating oil. It is to provide a power transmission device.

  A power transmission device according to the present invention includes a first gear that is rotatably provided, a second gear that includes a head portion formed with a tooth portion that meshes with the first gear, and a shaft portion that is connected to the head portion; A housing in which the first gear and the head portion of the second gear are housed, and a first compartment in which oil is stored in the bottom and a second compartment in which the shaft portion of the second gear is housed are formed inside. The casing is provided in the housing case with a space from the outer peripheral surface of the shaft portion of the second gear, and is formed so as to surround the outer peripheral surface of the shaft portion, at the boundary between the first compartment and the second compartment. The boundary part provided, the bottom part of a 1st division chamber, and the bottom part of a 2nd division chamber are connected, and the oil distribution mechanism through which oil distribute | circulates is provided. And it forms so that the internal peripheral surface of the said boundary part may expand toward the 1st division chamber side from the 2nd division chamber side. Preferably, a bearing portion that rotatably supports the shaft portion of the second gear is further provided, and the bearing portion is positioned on an inner surface of the housing case, on an inner side of the outer race, Including an inner race mounted on the outer peripheral surface of the shaft portion of the two gears, the outer race serving as a boundary, and the inner peripheral surface of the outer race expanding from the second compartment side toward the first compartment side. Formed as follows. Preferably, a third compartment located opposite to the first compartment with respect to the second compartment is formed in the housing case, and is provided at the boundary between the second compartment and the third compartment. Both are further provided with a rear-side bearing portion that rotatably supports the shaft portion of the second gear. And the said rear side bearing part is located inside the rear side outer race mounted on the inner surface of the housing case and the rear side outer race, and the rear part mounted on the outer peripheral surface of the shaft portion of the second gear. The inner circumferential surface of the rear outer race is formed such that the inner peripheral surface of the rear outer race expands from the second compartment side toward the third compartment side, and the oil circulation mechanism is formed on the bottom of the second compartment. Connect the bottom of the third compartment.

  Preferably, the oil circulation mechanism includes a tank disposed below the second compartment and outside the storage case. Preferably, the oil circulation mechanism includes an oil supply device that supplies the oil stored in the tank to the second compartment. Preferably, the engine further includes an engine and an intake pipe through which air supplied to the engine circulates, and the oil supply device is disposed in the cylinder portion and in the cylinder portion, and is expandable and contractible. And a vent pipe connecting the inside of the bag part and the intake pipe. Preferably, the engine further includes an engine and an intake pipe through which air supplied to the engine flows, and the oil supply device connects a cylinder part communicating with the tank and the second compartment, and connects the inside of the cylinder part and the intake pipe. It includes a ventilation pipe and a piston part that is disposed in the cylinder part, is provided so as to be movable in the cylinder, and draws oil in the tank into the cylinder part.

  According to the power transmission device of the present invention, the power transmission device itself can be downsized while ensuring lubrication circulation.

It is sectional drawing of the differential 100 which concerns on this invention. It is sectional drawing which shows the structure located in the compartment 142 and its circumference | surroundings. It is sectional drawing which shows the differential 100 after the drive pinion 114 rotates from the state shown in FIG. 1, and predetermined time passes. 6 is a cross-sectional view of the differential 100 showing a first modification of the differential 100. FIG. It is sectional drawing which shows typically the oil distribution apparatus 190 mounted in the differential 100 shown in FIG. It is sectional drawing which shows typically the oil supply apparatus 200 when an engine starts. 6 is a differential sectional view showing a second modification of the differential 100. FIG. It is sectional drawing which shows typically the oil supply apparatus 300 mounted in the differential 100 shown by FIG.

  The differential according to the embodiment of the present invention will be described with reference to FIGS.

  Note that in the embodiments described below, when referring to the number, amount, and the like, the scope of the present invention is not necessarily limited to the number, amount, and the like unless otherwise specified. In the following embodiments, each component is not necessarily essential for the present invention unless otherwise specified.

  FIG. 1 is a cross-sectional view of a differential (power transmission device) 100 according to the present invention. As shown in FIG. 1, the differential 100 includes a ring gear 112 fixed to a differential case (not shown), and a drive pinion 114 that meshes with the ring gear 112. The drive pinion 114 includes a head portion 116 formed with a tooth portion that meshes with the ring gear 112, and a shaft portion 115 connected to the head portion 116.

  The differential 100 includes a differential carrier (accommodating case) 110 having an accommodating chamber 140 formed therein, and the ring gear 112 and the drive pinion 114 are accommodated in the accommodating chamber 140.

  The accommodation chamber 140 includes a compartment (first compartment) 141 that accommodates the ring gear 112 and the head portion 116, a compartment (second compartment) 142 that accommodates the middle part of the shaft 115, and an end of the shaft 115. And a compartment (third compartment) 143 for accommodating the part side.

  A bearing portion 120 is disposed at the boundary portion between the partition chamber 141 and the partition chamber 142, and a bearing portion 121 is provided at the boundary portion between the partition chamber 141 and the partition chamber 142. The compartment 143 is located on the opposite side of the compartment 141 with respect to the compartment 142. The compartment 141 is formed along the outer peripheral edge of the ring gear 112, and oil 160 is stored at the bottom of the compartment 141.

  The bearing part 120 and the bearing part 121 support the shaft part 115 in a rotatable manner. The bearing portion 120 is rotatably provided between the outer race 130 fixed to the inner peripheral surface of the differential carrier 110, the inner race 132 fixed to the outer peripheral surface of the shaft portion 115, and the inner race 132 and the outer race 130. And a plurality of rollers 131.

  As the roller 131 rotates, the inner race 132 can rotate relative to the outer race 130, and the drive pinion 114 can rotate relative to the differential carrier 110.

  The bearing portion 121 is rotatably provided between the outer race 135 fixed to the inner surface of the differential carrier 110, the inner race 137 attached to the outer peripheral surface of the shaft portion 115, and the outer race 135 and the inner race 137. A roller 136.

  As the roller 136 rotates, the outer race 135 and the inner race 137 can rotate relative to each other, and the drive pinion 114 can rotate relative to the differential carrier 110. The compartment 143 of the differential carrier 110 is partitioned from the outside by a seal member 180.

  The differential 100 includes an oil distribution device (oil distribution mechanism) 190 that allows the oil 160 to circulate through the bottom of the compartment 141 and the bottom of the compartment 142.

  The oil distribution device 190 includes a tank 170 disposed at the bottom of the differential carrier 110, a distribution pipe 171 that connects the bottom of the compartment 141 and the tank 170, and a connection pipe that connects the tank 170 and the compartment 142. I have.

  FIG. 2 is a cross-sectional view showing the compartment 142 and the configuration located around it. As shown in FIG. 2, the outer race 130 is disposed at a distance from the outer peripheral surface of the shaft portion 115 of the drive pinion 114, and the outer race 130 is annular so as to surround the outer peripheral surface of the shaft portion 115. Is formed. The inner peripheral surface 150 of the outer race 130 is formed so as to increase in diameter from the compartment 142 side toward the compartment 141. The bearing portion (first partition portion) 121 is provided between the partition chamber 141 and the partition chamber 142 and partitions the partition chamber 141 and the partition chamber 142. The outer race (first boundary portion) 130 is provided at the boundary between the compartment 141 and the compartment 142. The inner race 132 is located inward of the outer race 130, and the inner peripheral surface of the inner race 132 and the inner peripheral surface 150 of the outer race 130 are arranged with a space in the radial direction of the shaft portion 115. ing. For this reason, a region located between the inner circumferential surface 150 and the inner circumferential surface 150 of the inner race 132 and a portion located between the rollers 131 is an oil circulation passage that communicates the compartment chamber 141 and the compartment chamber 142. ing. As shown in FIGS. 2 and 1, when the engine is started, the liquid level of the oil 160 is located between the inner race 132 and the outer race 130 of the bearing portion 120.

  When the engine is driven and the drive pinion 114 rotates, the inner race 132 starts to rotate relative to the outer race 130. As the inner race 132 and the drive pinion 114 rotate in this way, the oil 160 located around the inner race 132 and the drive pinion 114 also starts to flow around the rotation center line of the drive pinion 114. . As described above, when the oil 160 starts to flow, centrifugal force is applied to the oil 160.

  When the oil 160 reaches the inner peripheral surface 150, the oil 160 presses the inner peripheral surface 150 in a direction perpendicular to the rotation center line. On the other hand, the oil 160 receives a reaction force from the inner peripheral surface 150. Here, since the inner peripheral surface 150 is formed so as to expand in diameter from the compartment 142 side toward the compartment 141 side, the reaction force applied to the oil 160 is a component force along the rotation center line. And a component force perpendicular to the center of rotation.

  Then, the component force along the rotation center line presses the oil 160 from the compartment 142 side toward the compartment 141.

  For this reason, the oil 160 located between the outer race 130 and the inner race 132 starts to flow toward the compartment 141 side sequentially as the drive pinion 114 rotates. Then, the oil in the compartment 142 is sequentially sucked into the bearing portion 120 and supplied to the compartment 141. Oil 160 in the compartment 141 is supplied to the compartment 142 through the oil distribution device 190.

  Thus, according to this differential 100, when the bearing part 120 rotates, the oil 160 is automatically circulated between the compartment 141 and the compartment 142, and the oil 160 can be supplied to the bearing 120. .

  And by providing the oil distribution device 190 that communicates the bottom of the compartment 141 and the bottom of the compartment 142, the circulation of the oil 160 can be ensured, and the bearing 120 can be lubricated with a simple and compact configuration. It is secured.

  The outer race 135 of the bearing portion 121 is mounted on the inner peripheral surface of the differential carrier 110 with a space from the shaft portion 115 of the drive pinion 114. The outer race 135 is formed in an annular shape so as to surround the outer peripheral surface of the shaft portion 115. The bearing portion (second partition portion) 121 partitions the partition chamber 142 and the partition chamber 143. The outer race (first boundary portion) 135 is provided at the boundary between the compartment 142 and the compartment 143, and the inner race 137 is disposed inside the outer race 135. The inner peripheral surface 151 of the outer race 135 and the inner peripheral surface of the inner race 137 are located at a distance from each other in the radial direction of the shaft portion 115. A portion located between the inner circumferential surface 151 of the outer race 135 and the inner circumferential surface of the inner race 137 and located between the rollers 136 communicates the compartment chamber 142 and the compartment chamber 143. It is an oil passage. The inner peripheral surface 151 of the outer race 135 of the bearing portion 121 is formed so as to increase in diameter from the compartment 142 side toward the compartment 143 side.

  For this reason, when the drive pinion 114 rotates and the inner race 137 starts to rotate relative to the outer race 135, the oil 160 positioned between the inner race 137 and the outer race 135 also becomes the inner peripheral surface 151 of the outer race 135. Start flowing on top.

  And since the inner peripheral surface 151 inclines toward the compartment 143 side from the compartment 142 side, the oil 160 located between the outer race 135 and the inner race 137 begins to flow toward the compartment 143. In this manner, the oil 160 in the compartment 142 is sequentially sucked into the bearing portion 121, and lubrication of the bearing portion 121 is ensured.

  Here, when the inner race 132 of the bearing portion 120 and the inner race 137 of the bearing portion 121 rotate, the bearing portion 120 and the bearing portion 121 suck the oil 160. For this reason, the oil 160 stored in the bottom of the compartment 141 is drawn into the compartment 142 by the suction force of the bearing portions 120 and 121. The bearings 120 and 121 are lubricated by the oil 160 drawn into the compartment 142.

  Thus, in the initial state where the drive pinion 114 is not rotating, if the oil 160 is stored in the compartment 142 and the oil 160 is in contact with the bearing portions 120 and 121, the oil 160 in the compartment 141 Regardless of the height of the liquid level, the lubricity of the bearing portions 120 and 121 is ensured.

  Therefore, in the initial state, the oil 160 is filled in the differential carrier 110 so that the liquid level of the oil 160 reaches between the inner race and the outer race of the bearing portions 120 and 121, so that the ring gear can be used even during the driving of the engine. There is no need for 112 to pump up oil 160.

  Thereby, the amount of oil stored in the differential carrier 110 can be reduced, and the height of the liquid level of the oil 160 in the compartment 141 can be kept low.

  By suppressing the height of the liquid level of the oil 160 in the compartment 141, the contact area where the ring gear 112 contacts the oil 160 can be reduced. When the ring gear 112 rotates, the ring gear 112 is separated from the oil 160. The stirring resistance to be received can be reduced. Thereby, the drive efficiency of the vehicle is improved.

  The oil circulation device 190 is located below the compartment 142, and is disposed outside the differential carrier 110. The circulation pipe 171 connecting the tank 170 and the bottom of the compartment 141, the compartment 142, And a connecting pipe 172 to which the tank 170 is connected.

  Generally, the differential 100 is located in the engine compartment. And since the tank 170 is arrange | positioned under the differential carrier 110, when a vehicle drive | works, external air becomes easy to be sprayed on the tank 170. FIG. Thereby, the oil 160 in the tank 170 can be cooled satisfactorily.

  In particular, the temperature of the oil 160 can be kept low by storing the oil 160 in the tank 170 and collectively cooling the oil 160.

  Note that a supply hole 174 and a supply hole 175 are formed in the differential carrier 110. The supply hole 174 communicates with the compartment 142, and the supply hole 175 communicates with the compartment 143. The tank 170 and the supply hole 174 are connected by the connection pipe 172, and the supply hole 175 and the tank 170 are connected by the connection pipe 173.

  FIG. 3 is a cross-sectional view showing the differential 100 after the drive pinion 114 has rotated from the state shown in FIG. 1 and a predetermined time has elapsed.

  When the drive pinion 114 rotates, the ring gear 112 also rotates. As shown in FIG. 1, the lower end side of the ring gear 112 is immersed in the oil 160. Therefore, when the ring gear 112 rotates, the oil 160 is lifted up and adheres to the surface of the ring gear 112, the surface of the head portion 116, and the like.

  Thereby, the liquid level of the oil 160 in the compartment 141 falls below the liquid level of the oil 160 shown in FIG. For this reason, the stirring resistance applied to the ring gear 112 can be further reduced. On the other hand, as shown in FIG. 2, the oil 160 in the tank 170 is pulled up to the compartment 142 by the suction force from the bearing 120 and the bearing 121, and the oil 160 in the tank 170 passes through the connection pipe 172 and the supply hole 174. It is supplied to the compartment 142.

  Here, the oil 160 discharged from the bearing portion 121 into the compartment 143 is returned to the tank 170 through the supply hole 175 and the connection pipe 173.

  As described above, the lubricating oil circulation circuit that supplies the lubricating oil to the bearing portion 121 is configured with a simple configuration such as the tank 170, the connecting pipe 172, the supplying hole 174, the supplying hole 175, and the connecting pipe 173.

  Thus, the differential 100 can be made compact by ensuring lubrication of the bearing portion 121 with a simple configuration.

  In the example shown in FIGS. 1 to 3, the oil distribution device 190 includes a distribution pipe 171 connected to the bottom of the partition chamber 141, a tank 170 to which the distribution pipe 171 is connected, the tank 170 and the partition chamber. 142 and 143 are connected. However, the oil distribution device 190 is not limited to the above configuration.

  4 is a cross-sectional view of the differential 100 showing a first modification of the differential 100, and FIG. 5 is a cross-sectional view schematically showing the oil distribution device 190 mounted on the differential 100 shown in FIG.

  An oil distribution device 190 shown in FIGS. 4 and 5 includes a distribution pipe 171 connected to the bottom of the compartment 141, a tank 170 connected to the distribution pipe 171 and an oil supply apparatus 200 connected to the tank 170. And an oil supply pipe 204 that connects the oil supply device 200 and the compartment 142.

  The oil supply device 200 supplies the oil 160 stored in the tank 170 into the compartment 142. Specifically, the oil supply device 200 supplies oil 160 in the tank 170 into the compartment 142 when the engine is started.

  Thereby, for example, in the initial state when the engine is stopped, the oil 160 in the partition chamber 142 is small, and the liquid level of the oil 160 reaches between the outer race and the inner race of the bearing portion 120 and the bearing portion 121. Even when the oil supply device 200 is not in the state, the oil supply device 200 supplies the oil 160 into the compartment 142 so that the liquid level of the oil 160 in the compartment 142 is between the outer race and the inner race of the bearing portions 120 and 121. Can be reached.

  In this manner, when the oil 160 is supplied into the compartment 142 and the engine is started and the drive pinion 114 rotates, the bearing portions 120 and 121 suck the oil 160 in the compartment 142. be able to. Thereby, lubrication of the bearing part 120 and the bearing part 121 is ensured.

  In other words, the filling amount of the oil 160 filled in the differential carrier 110 can be reduced, and the stirring resistance applied to the ring gear 112 can be reduced.

  As shown in FIG. 5, the oil supply apparatus 200 communicates the cylinder 201 disposed above the tank 170, the connecting pipe 206 connecting the cylinder 201 and the tank 170, and the inside of the cylinder 201 with the compartment 142. The oil supply pipe 204 is provided.

  The oil supply device 200 further includes a bag portion 202 provided in the cylinder 201 and a vent pipe 203 that connects the cylinder 201 and the intake pipe 502 of the engine 500. Here, an end portion of the vent pipe 203 located in the cylinder 201 is connected to the bag portion 202. The other end of the vent pipe 203 is connected to the intake pipe 502.

  The engine 500 is connected to an engine main body 501 including cylinders and pistons, an intake pipe 502 that supplies external air to the engine main body 501, a throttle valve 503 disposed in the intake pipe 502, and the engine main body 501. An exhaust pipe 504 for discharging and an output shaft 506 are provided.

  Here, when the engine main body 501 is started, the intake pipe 502 has a negative pressure, and external air is drawn into the intake pipe 502. The amount of external air drawn in is adjusted by a throttle valve 503. For example, when the driver depresses the accelerator, the throttle valve 503 rotates, and the distribution area through which external air flows increases. Thus, when the air circulation area increases, the pressure in the intake pipe 502 increases, and the absolute value of the negative pressure decreases.

  On the other hand, when the amount of depression of the accelerator is small, the throttle valve 503 rotates so that the flow area through which the air flows is small. As the air flow area decreases, the pressure in the intake pipe 502 decreases and the absolute value of the negative pressure increases.

  The engine 500 is provided with an output shaft 506, and the power obtained by driving the engine body 501 is transmitted to the output shaft 506, and the output shaft 506 rotates. The power applied to the output shaft 506 is transmitted to the drive pinion 114 shown in FIGS.

  A connection portion between the ventilation pipe 203 and the intake pipe 502 is connected to a portion of the intake pipe 502 that is located downstream of the throttle valve 503 in the flow direction of the external air.

  In such an oil supply apparatus 200, when the engine is not driven, no negative pressure is generated in the intake pipe 502, and the bag portion 202 is in an initial state. Here, the bag portion 202 in the initial state is inflated in the cylinder 201. Most of the space in the cylinder 201 is occupied by the bag portion 202 in the initial state. Thereafter, when engine 500 is started, the pressure in intake pipe 502 becomes negative.

  FIG. 6 is a cross-sectional view schematically showing the oil supply device 200 when the engine is started.

  As shown in FIG. 6, when the internal pressure in the intake pipe 502 becomes negative, the air in the bag portion 202 is extracted and the bag portion 202 contracts. When the bag part 202 contracts and the volume of the bag part 202 decreases, the internal pressure in the cylinder 201 decreases rapidly.

  Along with this, the oil 160 in the tank 170 enters the cylinder 201 through the connection pipe 206. Then, the oil 160 that has entered the cylinder 201 flows into the compartment 142 through the oil supply pipe 204.

  Thus, when the engine is started, the oil 160 is supplied into the compartment 142, and the lubrication of the bearing portions 120 and 121 is ensured as described above.

  As shown in FIGS. 5 and 6, the opening of the connection pipe 206 located in the cylinder 201 is provided with a valve 205, and the opening of the oil supply pipe 204 located in the compartment 142 is A valve 207 is provided.

  For this reason, the oil 160 once entering the cylinder 201 from the tank 170 is suppressed from returning to the tank 170, and further, the oil in the compartment 142 is suppressed from entering the cylinder 201.

  Here, as described above, the connection portion between the vent pipe 203 and the intake pipe 502 is provided on the downstream side of the throttle valve 503. Therefore, when the throttle valve 503 changes the air flow area, the intake pipe 502 is changed. The internal pressure varies. Along with this, the shrinkage amount of the bag portion 202 changes, and the volume of the bag portion 202 changes. The oil 160 enters from the tank 170 when the volume of the bag portion 202 fluctuates. Then, oil 160 is newly supplied to the compartment 142. 5 and FIG. 6, the compartment 143 shown in FIG. 1 is connected to the tank 170, and the oil 160 supplied to the bearing portion 121 is then returned to the tank 170. Yes.

  In the example shown in FIGS. 4 to 6, oil is supplied to the compartment 142 by the oil supply device 200. For this reason, the oil amount with which the differential carrier 110 is filled can be reduced. Accordingly, even in the initial state where the engine is not driven, the filling amount of the oil 160 can be reduced to such an extent that the ring gear 112 does not contact the oil 160. Thereby, almost no stirring resistance applied to the ring gear 112 can be eliminated, and the drive efficiency of the vehicle can be further improved.

  FIG. 7 is a cross-sectional view of a differential showing a second modification of the differential 100, and FIG. 8 is a cross-sectional view schematically showing an oil supply device 300 mounted on the differential 100 shown in FIG. .

  The differential 100 shown in FIG. 7 is provided with an oil supply device 300 above a tank 170. As shown in FIG. 8, the oil supply device 300 is disposed above the tank 170 and connected to the tank 170, a piston portion 302 movably provided in the cylinder 301, and a cylinder 301. An oil supply pipe 304 that connects the inside and the compartment 142 is provided.

  A vent pipe 203 is connected to the cylinder 301, and the vent pipe 203 is connected to the intake pipe 502 shown in FIG. For this reason, when the engine is driven, the internal pressure in the vent pipe 203 becomes negative.

  In the oil supply device 300, the piston portion 302 is lowered to the lower end portion of the cylinder 301 by its own weight when the engine is not driven.

  When the engine is driven, the inside of the vent pipe 203 becomes negative pressure. Accordingly, the internal pressure of the space located on the side of the vent pipe 203 from the piston portion 302 in the internal space of the cylinder 301 also becomes a negative pressure. The oil supply pipe 304 is located closer to the vent pipe 203 than the piston part 302 located at the lower end of the cylinder 301, and a valve 307 is provided at the opening of the oil supply pipe 304 located in the compartment 142. Is provided. The vent pipe 203 is connected to the end of the cylinder 301 and is located on the opposite side of the tank 170 with respect to the oil supply pipe 304.

  And when the inside of the ventilation pipe 203 and the cylinder 301 becomes negative pressure, the piston part 302 rises. As the piston portion 302 rises, the pressure in the portion of the cylinder 301 located closer to the tank 170 than the piston portion 302 also decreases.

  Along with this, the oil 160 in the tank 170 is drawn into the cylinder 301. When the oil 160 is drawn into the cylinder 301, the valve 307 is opened, and the oil 160 is supplied from the oil supply pipe 304 into the compartment 142.

  In particular, the internal pressure in the vent pipe 203 varies depending on the rotation angle of the throttle valve 503 shown in FIG. The position of the piston part 302 is also displaced by the fluctuation of the pressure of the vent pipe 203. When the piston part 302 is displaced, the internal pressure of the part located below the piston part 302 in the cylinder 301 also varies. As a result, the oil 160 continues to be supplied into the compartment 141.

  Although the embodiment of the present invention has been described above, it should be considered that the embodiment disclosed this time is illustrative and not restrictive in all respects. The scope of the present invention is defined by the terms of the claims, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims. Furthermore, the above numerical values are examples, and are not limited to the above numerical values and ranges.

  The present invention can be applied to a power transmission device mounted on a vehicle and a vehicle including the power transmission device, and is particularly suitable for a differential device.

  100 differential, 110 differential carrier, 112 ring gear, 112 ring gear, 114 drive pinion, 115 shaft, 116 head, 120, 121 bearings, 130 outer race, 131 roller, 132 inner race, 140 accommodation chamber, 141 142,143 compartment, 150 inner peripheral surface, 160 oil, 170 tank, 171 flow pipe, 172, 173,206 connection pipe, 174,175 supply hole, 180 seal member, 190 oil flow apparatus, 200,300 oil supply apparatus , 201, 301 cylinder, 202 bag part, 203 vent pipe, 204 oil supply pipe, 205 valve, 207 valve, 302 piston part, 304 oil supply pipe, 307 valve, 500 engine, 501 engine main body, 502 intake pipe, 503 Throttle valve, 504 exhaust pipe, 506 output shaft.

Claims (7)

A first gear rotatably provided;
A second gear including a head part formed with a tooth part meshing with the first gear and a shaft part connected to the head part;
A first compartment in which the first gear and the head portion of the second gear are accommodated and oil is stored in the bottom, and a second compartment in which the shaft portion of the second gear is accommodated are formed inside. A storage case,
The second gear is provided in the housing case with a space from the outer peripheral surface of the shaft portion, and is formed so as to surround the outer peripheral surface of the shaft portion, and the first compartment and the second compartment A boundary provided at the boundary;
An oil circulation mechanism for connecting the bottom of the first compartment and the bottom of the second compartment, and through which the oil circulates;
With
The power transmission device formed so that the inner peripheral surface of the boundary portion may increase in diameter from the second compartment side toward the first compartment side. A bearing portion for rotatably supporting the shaft portion of the second gear;
The bearing portion includes an outer race attached to the inner surface of the housing case, and an inner race located inside the outer race and attached to the outer peripheral surface of the shaft portion of the second gear,
2. The power according to claim 1, wherein the outer race is the boundary portion, and an inner peripheral surface of the outer race is formed so as to expand in diameter from the second compartment side toward the first compartment side. Transmission device. A third compartment located on the opposite side of the first compartment with respect to the second compartment is formed in the storage case,
A rear bearing portion that is provided at a boundary between the second compartment and the third compartment and that rotatably supports the shaft portion of the second gear;
The rear-side bearing portion is positioned on the inner side of the rear-side outer race and the rear-side outer race mounted on the inner surface of the housing case, and the rear portion is mounted on the outer peripheral surface of the shaft portion of the second gear. Including the side inner race,
The inner peripheral surface of the rear side outer race is formed so as to expand in diameter from the second compartment side toward the third compartment side,
The power transmission device according to claim 1 or 2, wherein the oil circulation mechanism connects a bottom portion of the second compartment and a bottom portion of the third compartment.   4. The power transmission device according to claim 1, wherein the oil circulation mechanism includes a tank disposed below the second compartment and outside the storage case. 5.   The power transmission device according to claim 4, wherein the oil circulation mechanism includes an oil supply device that supplies the oil stored in the tank to the second compartment. Engine,
An intake pipe through which air supplied to the engine flows;
Further comprising
The oil supply device connects a cylinder portion communicating with the tank and the second compartment, a bag portion disposed in the cylinder portion and capable of expanding and contracting, and an interior of the bag portion and the intake pipe. The power transmission device according to claim 5, further comprising a ventilation pipe. Engine,
An intake pipe through which air supplied to the engine flows;
Further comprising
The oil supply device is disposed in the cylinder portion that communicates with the tank and the second compartment, a vent pipe that connects the inside of the cylinder portion and the intake pipe, and is movable within the cylinder portion. The power transmission device according to claim 5, further comprising: a piston portion that is provided in the tank and draws oil in the tank into the cylinder portion.

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