JP2023031485A - Oil lubrication structure - Google Patents

Abstract

To provide an oil lubrication structure capable of more stably supplying oil, which scatters with the operation of gears in a gear chamber receiving the oil and the gears, to an object to be lubricated as compared with the prior art.SOLUTION: An oil lubrication structure L comprises: a gear chamber 21b receiving oil and gears; an oil reservoir portion 70 in which the oil to be supplied to a lubrication object is stored in the gear chamber 21b; a pedestal portion 80 forming the periphery of the oil reservoir portion 70; a communication portion 84 communicating with the oil reservoir portion 70 so as to be capable of introducing the oil; a guide portion 72 extending outside the oil reservoir portion 70 with respect to the pedestal portion 80 along the oil reservoir portion 70 from a position on a lower side than the communication portion 84 to a position in front of the communication portion 84; and an overhanging portion 76 formed on an upper side with respect to the communicating portion 84 to overhang inward of the gear chamber 21b on the opposite side of the guide portion 72 with the communicating portion 84 as a reference.SELECTED DRAWING: Figure 4

Description

The present invention relates to an oil lubrication structure.

2. Description of the Related Art Conventionally, there has been provided a power transmission device such as that disclosed in Patent Document 1 below. The power transmission device of Patent Document 1 includes a final driven gear that meshes with a final drive gear, and a transmission case that rotatably supports the final driven gear via a bearing. In the power transmission device of Patent Literature 1, the transmission case is provided with a side wall positioned above the bearings, so that lubricating oil scraped up by the final driven gear can be received and guided to the bearings.

JP 2018-25259 A

By the way, the inventors of the present invention have studied the use of the oil that is raked up by the gears that operate in the gear chamber that accommodates the oil and the gears in the transaxle to lubricate various parts. It was found that it is sometimes difficult to stably supply the oil to the target location by catching the oil that scatters at the . Therefore, the oil that is scattered in the chamber containing the oil can be more stably supplied to the location to be lubricated compared to the conventional technology disclosed in Patent Document 1, for example. It would be desirable to provide a lubricating structure.

Therefore, the present invention provides an oil lubrication structure capable of more stably supplying oil, which scatters with operation of gears in a gear chamber containing oil and gears, to an object to be lubricated than in the prior art. aimed at

(1) The oil lubrication structure of the present invention includes a gear chamber that accommodates oil and a gear, an oil reservoir that stores oil to be supplied to a lubrication target in the gear chamber, and a pedestal that forms the outer edge of the oil reservoir. a communicating portion communicating with the oil reservoir so as to allow oil to be introduced into the oil reservoir; and a position outside the oil reservoir with respect to the pedestal from a position lower than the communicating portion and in front of the communicating portion. and a guide portion extending along the oil reservoir to a position of and projecting toward the inside of the gear chamber on the upper side with respect to the communicating portion on the side opposite to the guide portion with respect to the communicating portion. and a protruding portion formed on the .

The oil lubrication structure of the present invention has a communicating portion formed so as to be able to introduce oil into an oil reservoir portion in which oil to be supplied to an object to be lubricated is stored. Further, in the oil lubrication structure of the present invention, the guide portion provided outside the oil reservoir with respect to the pedestal portion forming the outer edge of the oil reservoir extends from a position below the communication portion to a position in front of the communication portion. It is formed to extend along the oil reservoir to a position. Therefore, according to the oil lubrication structure of the present invention, the oil scattered in the gear chamber can be guided by the guide portion and introduced into the oil reservoir through the communicating portion. Further, in the oil lubrication structure of the present invention, the projecting portion provided in the region above the communicating portion projects toward the inside of the gear chamber on the side opposite to the guide portion with respect to the communicating portion. is formed in Therefore, in the oil lubrication structure of the present invention, of the oil guided by the guide portion, the oil that scatters to the opposite side beyond the communicating portion can be captured by the projecting portion and guided toward the communicating portion. Therefore, according to the oil lubrication structure of the present invention, it is possible to stably supply the oil that is scattered in the gear chamber with the operation of the gear to lubricate the lubrication target.

Further, the oil lubrication structure of the present invention can improve the rigidity in the vicinity of the pedestal portion by providing the guide portion and the projecting portion as described above.

(2) The above-described oil lubrication structure is preferably characterized by having a bulging portion that bulges so as to face at least one of the guide portion and the communicating portion.

In the oil lubrication structure of the present invention, the oil scattering in the gear chamber is captured by the bulging portion and dropped toward the communicating portion and the guide portion by adopting the above-described configuration, and the oil reservoir is discharged through the communicating portion. can be introduced into departments. Therefore, the oil lubrication structure of the present invention, by adopting the above-described configuration, can make the most effective use of the oil that has been raked up by the gears in the gear chamber to lubricate the lubrication target.

In the oil lubrication structure of the present invention, when the bulging portion is provided as in (2) above, the bulging portion is provided above at least one of the guide portion and the communication portion. and good. With such a configuration, the oil lubrication structure of the present invention can more reliably drop the oil that hits the bulging portion toward the communication portion and the guide portion.

(3) The above-described oil lubrication structure has a recess formed between the guide portion and a wall surface forming the gear chamber outside the guide portion with respect to the oil reservoir portion. It is good if it is characterized.

In the oil lubrication structure of the present invention, with the configuration described above, the oil scattered in the gear chamber can be caught in the recess and guided to the communicating portion by the guide portion. Therefore, in the oil lubrication structure of the present invention, by providing the concave portion as described above, the oil that has been raked up by the gear in the gear chamber can be utilized to the greatest extent possible for lubrication of the object to be lubricated. .

(4) In the oil lubrication structure described above, the gear chamber is configured by fastening a plurality of structural bodies, and the bulging portion is integrated with a fastening boss provided on the structural body. It is preferable that it is characterized by being formed systematically.

With such a configuration, the oil lubrication structure of the present invention can utilize the portion that bulges out to form the boss portion for fastening as the bulging portion.

(5) The above-described oil lubrication structure may be characterized in that the lubrication target is a shaft having an oil flow hole through which oil can flow on the inner peripheral side.

With such a configuration, the oil lubrication structure of the present invention can supply a large amount of oil to the oil flow holes provided on the inner peripheral side of the shaft for lubrication.

(6) The above-described oil lubrication structure is preferably characterized in that a bearing that rotatably supports the shaft is accommodated in the pedestal.

By adopting such a configuration, the oil lubrication structure of the present invention can utilize the pedestal portion for accommodating the bearing, and can utilize the oil collected in the oil reservoir for lubricating the bearing.

According to the present invention, there is provided an oil lubrication structure capable of more stably supplying oil, which scatters with operation of gears in a gear chamber containing oil and gears, to an object to be lubricated than in the prior art. can provide.

FIG. 2 is a cross-sectional view showing the motor compartment side of the transaxle of the present invention; FIG. 2 is a sectional view showing the gear chamber side of the transaxle in FIG. 1; 2 is a cross-sectional view taken along line A-A' of FIG. 1; FIG. FIG. 2 is a perspective view showing a third component used in the transaxle of FIG. 1; FIG. 5 is a perspective view showing a third structure used in the transaxle of FIG. 1 viewed from an angle different from that of FIG. 4; FIG. 4 is an enlarged perspective view of a main part for explaining the flow of oil that scatters inside the gear chamber;

Hereinafter, an oil lubrication structure L according to an embodiment of the present invention will be described with reference to the drawings, taking as an example a transaxle 10 employing this structure. In the following description, prior to describing the oil lubrication structure L, the structure of the transaxle 10 will be described.

<<Configuration of Transaxle 10>>
The transaxle 10 is mounted on a vehicle equipped with an engine (not shown) and a battery (not shown). A vehicle equipped with the transaxle 10 can run by driving a generator 44, which will be described later, using the engine as a power source. This is a so-called series hybrid vehicle that can run (EV running) by driving the drive motor 50 by driving the battery as a power source (see FIG. 3).

Note that the transaxle 10 of the present invention can be suitably used for a hybrid vehicle equipped with an engine, such as a series hybrid vehicle or a parallel hybrid vehicle, as in the present embodiment.

As shown in FIG. 1, the transaxle 10 includes a transaxle housing 20, a generator 44, a drive motor 50, and a differential mechanism 40. As shown in FIG. Further, as shown in FIG. 3 , the transaxle 10 has a counter shaft 55 and a counter gear 56 .

The transaxle housing 20 is a container for housing the generator 44, the drive motor 50, and the like. As shown in FIG. 1, the transaxle housing 20 forms a single container by fastening a plurality of constituent members. In the present embodiment, the transaxle housing 20 is formed by fastening and integrating three constituents consisting of a first constituent 20a, a second constituent 20b, and a third constituent 20c.

As shown in FIG. 3 , the first structure 20 a forms an intermediate portion in the width direction W of the transaxle housing 20 . As shown in FIG. 3, a partition wall portion 22 is formed in the first structure 20a, and the partition wall portion 22 partitions the space into a motor chamber 21a and a gear chamber 21b. The second structure 20b is fastened to the motor chamber 21a side of the first structure 20a. Furthermore, the third component 20c is fastened to the gear chamber 21b side. The generator 44 and the drive motor 50 are housed in the motor chamber 21a, and the differential mechanism 40 such as the differential ring gear 42 is housed in the gear chamber 21b.

Further, oil is contained inside the transaxle housing 20 . The transaxle 10 can cool the generator 44 and the drive motor 50 by pumping oil from an oil pump (not shown).

The generator 44 consists of a motor generator (MG1). A generator controller including an inverter and the like is connected to the generator 44 . The generator controller is connected to a battery composed of an assembled battery in which a plurality of secondary batteries are combined. The AC power output from the generator 44 is converted into DC power by the generator controller, and the DC power is supplied to the battery to charge the battery.

The drive motor 50 consists of a motor generator (MG2). The drive motor 50 is connected to a motor controller including an inverter and the like. A battery is connected to the motor controller. The DC power output from the battery is supplied to the motor controller, the DC power is converted into AC power by the motor controller, and the AC power is supplied to the drive motor 50, whereby the drive motor 50 is driven. The drive motor 50 has a rotor 52 rotatable within a stator (not shown).

As shown in FIG. 3 , a carrier shaft 53 is provided on the same axis as the rotating shaft (rotor shaft) of the drive motor 50 . The carrier shaft 53 is held rotatably relative to the rotary shaft of the drive motor 50 . The other end of the carrier shaft 53 is rotatably held by the transaxle housing 20 . A carrier gear 54 is provided on the carrier shaft 53 . This allows the carrier shaft 53 to rotate together with the carrier gear 54 .

As shown in FIG. 3 , the counter shaft 55 extends parallel to the carrier shaft 53 and is rotatably held by the transaxle housing 20 . The counter gear 56 is provided so as to rotate integrally with the counter shaft 55 and meshes with the carrier gear 54 . An output gear 57 is provided so as to rotate together with the counter shaft 55 . The output gear 57 meshes with the differential ring gear 42 .

The differential mechanism 40 is configured to allow a differential between a pair of left and right drive shafts (not shown) that drive the left and right drive wheels, and to transmit rotational power to the pair of left and right drive shafts. . The differential mechanism 40 includes a plurality of gears including a differential ring gear 42 and a differential gear 43 .

Power of the drive motor 50 is transmitted to the carrier shaft 53 . The power transmitted to carrier shaft 53 is transmitted to differential ring gear 42 of differential mechanism 40 via carrier gear 54, counter gear 56 and output gear 57, and from differential mechanism 40 via a drive shaft (not shown). It is transmitted to drive wheels (not shown). This causes the drive wheels to rotate and the vehicle to run.

The transaxle housing 20 is provided with an oil pump (not shown). Further, as shown in FIG. 1, the motor chamber 21a in the transaxle housing 20 is provided with oil ejection ports 61 and 62 for ejecting oil pressure-fed from the oil pump. The oil ejection port 61 ejects oil from above toward the generator 44 (MG1). Also, the oil ejection port 62 ejects oil from above toward the drive motor 50 (MG2). Thus, the transaxle 10 circulates the oil in the motor chamber 21a by the oil pump to cool each motor.

The gear chamber 21b side of the transaxle housing 20 contains oil. As shown in FIG. 2, the gear chamber 21b contains an amount of oil that substantially immerses half of the differential ring gear 42 (see oil level Fo1 in FIG. 2).

The transaxle housing 20 is a housing body for housing the generator 44, the drive motor 50, and the like that constitute the transaxle 10. As shown in FIG. As described above, the transaxle housing 20 is provided with the partition wall portion 22 that partitions the internal space (see FIG. 3). The internal space of the transaxle housing 20 is partitioned by a partition wall portion 22 into a motor chamber 21a and a gear chamber 21b. A generator 44 and a drive motor 50 are accommodated in the motor chamber 21a. A differential mechanism 40 such as a differential ring gear 42 is housed in the gear chamber 21b.

As shown in FIG. 1 , the transaxle housing 20 is provided with a first rib 24 . Further, as shown in FIG. 2 , the transaxle housing 20 is provided with a second rib 25 and a third rib 26 .

As shown in FIG. 1, the first rib 24 is formed on the motor chamber 21a side. The first rib 24 has a curved shape, and constitutes an oil reservoir 30 that receives and stores the oil dripped from above by the first rib 24 . Thus, the transaxle 10 is formed with the oil reservoir 30 on the side of the motor chamber 21a.

As shown in FIG. 2, the second rib 25 is formed on the gear chamber 21b side. The second rib 25 has a curved shape along the outer circumference of the differential ring gear 42 . The second rib 25 functions as an oil guide portion 36 that guides the oil raked up in the rotation direction X by the differential ring gear 42 to the second communication portion 34 . The oil raked up by the differential ring gear 42 reaches the second communication portion 34 along the second rib 25 (oil guide portion 36).

As shown in FIG. 2, the third rib 26 is formed on the gear chamber 21b side. The third rib 26 is provided in the vicinity of the first communication portion 32a and forms an oil guide portion 38 that guides oil that has flowed into the gear chamber 21b through the first communication portion 32a. The oil that has flowed into the gear chamber 21b side from the first communication portion 32a is guided to the right side of the differential mechanism 40 while being guided by the third rib 26 (oil guide portion 38).

As shown in FIGS. 1 and 2, the partition wall portion 22 is formed with a plurality of communicating portions that communicate the motor chamber 21a and the gear chamber 21b. More specifically, the partition wall portion 22 is provided with a first communication portion 32 and a second communication portion 34 as communication portions formed in the vicinity of the oil storage portion 30 .

The first communication portion 32 is provided to allow the oil stored in the oil storage portion 30 to flow into the gear chamber 21b. In this embodiment, two first communication portions 32 are provided, that is, a first communication portion 32a and a first communication portion 32b. As shown in FIG. 1, the first communication portion 32a is an elongated through hole. Also, the first communication portion 32b is a circular through hole.

The second communication portion 34 is provided to allow the oil that has been raked up by the differential ring gear 42 to flow into the oil storage portion 30, which will be described later. As shown in FIG. 1, the second communicating portion 34 is a circular through hole. As described above, in the transaxle 10, the differential ring gear 42 and the output gear 57 are meshed. The output gear 57 has a helical tooth surface, and oil is blown from the tooth surface of the output gear 57 toward the second communication portion 34 over the bearing. The oil that reaches the second communication portion 34 in this manner flows into the oil storage portion 30 .

As shown in FIG. 1 , the drive motor 50 (MG2) is arranged above the differential mechanism 40 . In addition, as described above, the oil reservoir 30 is arranged below the drive motor 50 (MG2). Therefore, the oil that has flowed into the oil storage portion 30 drips from the first communication portion 32 to lubricate the differential ring gear 42 and the like.

Also, the differential ring gear 42 rotates in the direction (rotational direction X) shown in FIG. In other words, the oil in the gear chamber 21b is raked up in the rotational direction X shown in FIG. 1 as the differential ring gear 42 rotates. Further, the second rib 25 (oil guide portion 36) is provided at a position on an extension line of the oil raking direction (rotational direction X). Therefore, the transaxle 10 can efficiently guide the oil scraped up by the rotation of the differential ring gear 42 to the oil reservoir 30 and allow the oil to flow into the oil reservoir 30 .

≪About oil lubrication structure L≫
The transaxle 10 is generally configured as described above, and is configured to allow oil to flow between the motor chamber 21a and the gear chamber 21b while lubricating each portion. The oil lubrication structure L is configured as shown in FIGS. It is a structure for introducing into the oil reservoir 70 the oil flowing in the vicinity of the oil reservoir 70 provided in the third structure 20c among the raised oil and lubricating the object to be lubricated. In this embodiment, the oil reservoir 70 is configured using a pedestal 80 that accommodates the bearing 53a that supports the end of the carrier shaft 53, and the bearing 53a and the like are to be lubricated. The oil lubrication structure L will be described in more detail below.

As shown in FIGS. 4 to 6, the oil lubrication structure L uses an oil reservoir portion 70, a guide portion 72, a recess portion 74, a protruding portion 76, and a protruding portion 78 formed in the third structure 20c. configured as follows.

The oil reservoir portion 70 is a portion for accumulating oil to be supplied to a lubrication target in the gear chamber. The oil reservoir 70 has a pedestal 80 and a reservoir blocker 82 . The pedestal portion 80 forms an outer edge of the oil reservoir portion 70 . In the present embodiment, the size is such that the bearing 53a can be fitted therein, and is formed to have a substantially circular shape when viewed from the front. The pedestal portion 80 is erected with the side surface of the gear chamber 21b as a base end, and the other end is an open end. A communicating portion 84 for introducing oil into the oil reservoir portion 70 is formed in the base portion 80 .

The communicating portion 84 is formed by a groove extending radially inward from the pedestal portion 80 . Communicating portion 84 is formed so that oil can be introduced downward from above when transaxle 10 is installed. The communication portion 84 is cut out in an arc shape at a portion on the outer peripheral side of the pedestal portion 80 and on the base end side (side surface side of the gear chamber 21b). As a result, the opening for introducing oil in the communicating portion 84 is expanded.

The reservoir blocker 82 is a plate attached to the open end of the pedestal 80 to close the pedestal 80 . The reservoir closing member 82 is provided with a fan-shaped opening 88 and a nozzle-shaped insertion portion 90 . The insertion portion 90 is in the shape of a pipe that communicates the inside and outside of the oil reservoir portion 70 . The insertion portion 90 is formed substantially at the axial center position of the oil reservoir 70 so as to protrude toward the outside of the oil reservoir 70 (the inside of the gear chamber 21b). The insertion portion 90 can be inserted into an oil flow hole 53b provided on the inner peripheral side (axial side) of the carrier shaft 53. As shown in FIG.

The guide portion 72 is a rib-like member formed so as to protrude from the side surface of the gear chamber 21b toward the inside of the gear chamber 21b. Further, the guide portion 72 functions as a guide for guiding the oil scattered inside the gear chamber 21b toward the communicating portion 84 of the oil reservoir portion 70. As shown in FIG. The guide portion 72 is provided radially outside the oil reservoir portion 70 with respect to the pedestal portion 80 . Guide portion 72 is formed to extend along oil reservoir portion 70 . Further, the guide portion 72 is formed so as to reach a position in front of the communication portion 84 from a position below the communication portion 84 .

The recessed portion 74 is formed between the guide portion 72 and the wall surface forming the outer circumference of the gear chamber 21 b outside the guide portion 72 (upper side in the present embodiment) with respect to the oil reservoir portion 70 . Thereby, the recessed portion 74 constitutes a space that can receive the oil that scatters outside the guide portion 72 . Further, the guide portion 72 constitutes the lower surface of the recess portion 74 . Therefore, the oil that has flowed into the recessed portion 74 is guided along the guide portion 72 toward the communicating portion 84 side.

The protruding portion 76 is a portion that protrudes toward the inside of the gear chamber 21b on the upper side of the communicating portion 84 and on the side opposite to the guide portion 72 with the communicating portion 84 as a reference. The protruding portion 76 is located between the edge of the third structure 20c and the outer periphery of the pedestal portion 80. As shown in FIG. A protruding rib 86 that protrudes further into the gear chamber 21 b than the protruding portion 76 is provided at the portion where the protruding portion 76 is provided. The protruding rib 86 is formed so as to extend in the tangential direction of the substantially circular oil reservoir 70 (pedestal 80). The protruding rib 86 can guide the oil that is raked up from the lower side (upstream side) of the oil reservoir 70 in the gear chamber 21 b toward the communication portion 84 .

The bulging portion 78 is provided between the guide portion 72 and the bulging portion 76 described above. The bulging portion 78 bulges so as to face the guide portion 72 and the communicating portion 84 . Also, the bulging portion 78 is provided above the guide portion 72 and the communicating portion 84 . The bulging portion 78 bulges toward the inside of the gear chamber 21 b more than the bulging portion 76 . Further, the bulging portion 78 is formed integrally with the boss portion 23 provided for fastening with the first component 20a at the outer edge portion of the third component 20c.

Further, a convex portion 78a is provided in the midsection of the bulging portion 78 and protrudes toward the gear chamber 21b. The protrusion 78 a is formed on the upper side with respect to the communicating portion 84 so that the tip thereof protrudes toward the communicating portion 84 .

The oil lubrication structure L of this embodiment is configured as described above. With such a configuration, the oil scattered by the operation of the gears in the gear chamber 21b passes through the gap between the bearing 53a and the guide portion 72, and then travels through various paths as indicated by the arrows in FIG. , it flows into the oil reservoir 70 via the communicating portion 84 . Specifically, the oil scattered in the gear chamber 21 b hits the guide portion 72 and flows into the gap between the guide portion 72 and the bearing 53 a that supports the carrier shaft 53 fitted in the pedestal portion 80 . After that, the oil passes between the bearing 53 a and the guide portion 72 and reaches the communicating portion 84 . Most of the oil that has reached the communication portion 84 through such a route (first route) flows into the oil reservoir 70 via the communication portion 84 .

Further, of the oil that has passed between the bearing 53a and the guide portion 72, part of the oil that crosses the communicating portion 84 and moves toward the protruding portion 76 hits the protruding portion 76 and the protruding ribs 86 and rebounds to communicate with the bearing 53a. The oil scatters along a path (second path) dropping toward the portion 84 and flows into the oil reservoir portion 70 . In addition, of the oil bounced back from the protruding portion 76 and the protruding ribs 86 , the oil that did not fall to the communicating portion 84 side flows into the recessed portion 74 formed on the upper side of the guide portion 72 , and then flows into the guide portion 72 . is guided to the communicating portion 84 via a path (third path) that falls along the . As a result, oil flows into the oil reservoir 70 from the recess 74 .

As described above, the oil scattered in the gear chamber 21b includes oil that flows into the oil reservoir 70 through the first path passing through the gap between the bearing 53a and the guide portion 72, Some flows into the oil reservoir 70 through two routes, and some flows into the oil reservoir 70 through the third route from the first route through the second route. All of these oils flow through the first path formed by the bearing 53a and the guide portion 72, but there is also oil that scatters inside the gear chamber 21b without passing through the first path. ing. Such oil is also guided by the protruding portion 76 and the protruding rib 86 provided in the gear chamber 21b through a route different from the above-described routes, or flows into the recessed portion 74, thereby causing an oil reservoir. It is envisioned that it flows into section 70 .

The oil introduced into the oil reservoir 70 as described above lubricates the bearing 53a for supporting the carrier shaft 53 fitted in the pedestal 80. As shown in FIG. Further, the oil introduced into the oil reservoir 70 is introduced into an oil flow hole 53b provided on the inner peripheral side (axial side) of the carrier shaft 53. As shown in FIG. The oil circulation hole 53 b communicates with the oil circulation hole 51 a provided on the inner peripheral side (axial side) of the rotor shaft 51 of the drive motor 50 connected to the carrier shaft 53 . In addition, at the connecting portion between the rotor shaft 51 and the carrier shaft 53 and at the end portion of the rotor shaft 51, the oil circulation hole 51a is provided with bearings 51b and 51c for supporting the rotor shaft 51 and the base end side of the carrier shaft 53. It communicates with the portion where the bearing 53c for supporting the is arranged. Therefore, the oil that has flowed into the oil circulation holes 51a, 53b also spreads over the bearings 51b, 51c, 53c to lubricate them.

As described above, the oil lubrication structure L of the present embodiment has the communicating portion 84 formed so as to allow the introduction of oil into the oil reservoir portion 70 in which the oil to be supplied to the lubrication target is stored. Further, in the oil lubrication structure L, the guide portion 72 provided outside the oil reservoir portion 70 with respect to the pedestal portion 80 forming the outer edge of the oil reservoir portion 70 is positioned downward from the communication portion 84 to the communication portion. It is formed so as to extend along the oil reservoir 70 to a position in front of 84 . Therefore, according to the oil lubrication structure L described above, the oil scattered in the gear chamber 21 b can be guided by the guide portion 72 and introduced into the oil reservoir portion 70 via the communicating portion 84 . Further, in the oil lubrication structure L of the present embodiment, the projecting portion 76 provided in the upper region with respect to the communicating portion 84 is located on the side opposite to the guide portion 72 with respect to the communicating portion 84 and the gear chamber 21b. It is formed so as to protrude inward. Therefore, in the oil lubrication structure L of the present embodiment, of the oil guided by the guide portion 72, the oil that scatters to the opposite side beyond the communicating portion 84 is captured by the projecting portion 76 and directed toward the communicating portion 84. can guide you. Therefore, according to the oil lubrication structure L described above, the oil that is scattered in the gear chamber 21b due to the operation of the gear can be stably supplied for lubrication of the lubrication target.

Further, the oil lubrication structure L described above has a bulging portion 78 that bulges so as to face at least one of the guide portion 72 and the communicating portion 84 . Therefore, in the oil lubrication structure L, the oil scattering in the gear chamber 21b is captured by the bulging portion 78, dropped toward the communicating portion 84 and the guide portion 72, and dropped into the oil reservoir portion 70 via the communicating portion 84. can be introduced into Therefore, the oil lubrication structure L, by adopting the above-described configuration, can make the most effective use of the oil that has been raked up by the gears in the gear chamber 21b to lubricate the lubrication target.

In this embodiment, an example is shown in which the bulging portion 78 and the convex portion 78a are arranged above both the guide portion 72 and the communication portion 84 so as to face both of them, but the present invention is not limited to this. , but may be provided so as to face either one. Further, instead of providing the convex portion 78a in the middle portion of the bulging portion 78, or in addition to providing it in the middle portion of the bulging portion 78, the convex portion 78a may be provided in another portion. Specifically, the convex portion 78a may be provided, for example, at the inlet portion of the communication portion 84, at a position on the back side (the wall surface side of the gear chamber 21b) with respect to the communication portion 84, or the like.

Moreover, in the present embodiment, the configuration in which the bulging portion 78 is provided or the convex portion 78a is provided in the bulging portion 78 is exemplified, but the present invention is not limited to this. For example, the oil lubrication structure L may have a configuration in which the protruding portion 78a is not provided on the bulging portion 78, or a configuration in which the bulging portion 78 is not provided.

Since the oil lubrication structure L of this embodiment is configured such that the guide portion 72, the protruding portion 76, and the protruding portion 78 are provided near the base portion 80 as described above, the rigidity in the vicinity of the base portion 80 is reduced. can be improved.

The oil lubrication structure L described above has a recess 74 formed between the guide portion 72 and the wall surface of the gear chamber 21 b outside the guide portion 72 with respect to the oil reservoir portion 70 . Therefore, in the oil lubrication structure L, the oil scattered inside the gear chamber 21b can be caught in the recess 74 and guided to the communicating portion 84 by the guide portion 72 . Therefore, the oil lubrication structure L utilizes the recess 74 formed on the upper side of the guide portion 72 in order to capture the oil that has been raked up by the gear in the gear chamber 21b and supply it toward the communicating portion 84. can.

In this embodiment, the space formed above the guide portion 72 is used as the recess 74 for receiving oil, but the present invention is not limited to this. For example, the oil lubrication structure L may not include the recess 74 in cases such as when a sufficient space for providing the recess 74 cannot be secured above the guide portion 72 .

Further, in the oil lubrication structure L described above, the bulging portion 78 is formed by utilizing the boss portion provided for fastening the first component 20a and the third component 20c, which constitute the gear chamber 21b, with bolts or the like. It is Therefore, the oil lubrication structure L does not need to provide a special bulging portion for forming the bulging portion 78, and the structure can be simplified accordingly. In this embodiment, an example in which the bolt fastening boss portion is utilized as the bulging portion 78 is shown, but the present invention is not limited to this, and a separate bulging portion for forming the bulging portion 78 is provided. It is also possible to form the protruded portion. With such a configuration, the bulging portion 78 can be provided at an optimum position without being limited to the tightening position of the bolt.

In the oil lubrication structure L described above, the object to be lubricated is the carrier shaft 53 (shaft body) having an oil flow hole 53b through which oil can flow on the inner peripheral side. Therefore, the oil lubrication structure L can supply a large amount of oil to the oil flow holes 53b provided on the inner peripheral side of the carrier shaft 53 for lubrication. In this embodiment, an example in which the carrier shaft 53 is lubricated by supplying the oil stored in the oil reservoir 70 is shown, but the present invention is not limited to this. Alternatively, in addition to this, other locations may be communicated with the oil reservoir 70 to supply oil.

In the oil lubrication structure L described above, the pedestal portion 80 accommodates the bearing 53a that rotatably supports the shaft. Therefore, according to the oil lubrication structure L described above, the oil stored in the oil reservoir 70 can be used to lubricate the bearing 53a while the pedestal portion 80 is used to accommodate the bearing 53a. In this embodiment, an example in which the bearing 53a is fitted in the pedestal portion 80 is shown, but the present invention is not limited to this. It may not be housed in each part of the oil reservoir 70 .

INDUSTRIAL APPLICABILITY The present invention can be suitably used in general equipment having a gear chamber containing oil and gears, such as a transaxle mounted on a vehicle.

21b: gear chamber 53: carrier shaft 53 (shaft)
53a: Bearing 53b: Oil flow hole 70: Oil reservoir 72: Guide portion 74: Recessed portion 76: Protruding portion 78: Protruding portion 80: Base portion 84: Communicating portion L: Oil lubrication structure

Claims (3)

a gear chamber containing oil and gear;
an oil reservoir in which oil to be supplied to an object to be lubricated is stored in the gear chamber;
a pedestal forming an outer edge of the oil reservoir;
a communicating portion communicating so as to allow oil to be introduced into the oil reservoir;
a guide portion extending along the oil reservoir from a position below the communication portion to a position in front of the communication portion outside the oil reservoir with respect to the pedestal;
a protruding portion formed to protrude toward the inside of the gear chamber on the upper side of the communicating portion and on the side opposite to the guide portion with respect to the communicating portion;
An oil lubrication structure characterized by having: Having a bulging portion that bulges so as to face at least one of the guide portion and the communication portion;
The oil lubrication structure according to claim 1, characterized by: 3. The oil reservoir according to claim 1, further comprising a recess formed between a wall surface of said gear chamber and said guide portion outside said guide portion with respect to said oil reservoir portion. of oil lubrication structure.

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