JP4563018B2 - Case oil sump structure - Google Patents

Description

  The present invention relates to an oil sump structure of a case in which an automatic transmission and a hybrid drive device are accommodated.

  In a drive unit equipped with an automatic transmission, the valve body is attached to the lower part of the case, and the valve body is covered with an oil pan from below. Oil is stored in the oil pan (for example, Patent Document 1).

  Regarding the oil level in the case described above, in general, in order to prevent a decrease in hydraulic pressure due to air suction, it is better to increase the oil amount, that is, the oil level is higher. However, when the amount of oil is increased and the oil level is increased, breather blowing occurs due to oil agitation that occurs during rotation of the planetary gear or the like. From this point, a lower oil level is preferable.

JP 2001-27310 A

  However, the oil moves in the oil pan according to the direction of inclination when the vehicle body is tilted, to the rear when the vehicle is accelerated, and to the front when the vehicle is decelerated. Thus, the oil level changes greatly because the oil in the oil pan moves when the vehicle body is tilted or during acceleration / deceleration. The oil level also rises and falls according to changes in the oil temperature. That is, the oil level is high when the oil temperature is high and low when the oil temperature is low.

  Then, when the oil level changes greatly, the above-described decrease in hydraulic pressure due to air suction or breather blowing occurs.

  Thus, it is very difficult to set the oil level so that both the decrease in hydraulic pressure and breather blowing can be appropriately prevented.

  An object of the present invention is to provide an oil sump structure for a case in which an oil sump is provided on the lower surface of the case to suppress changes in the oil level and thereby solve the above-described problems. .

In the invention according to claim 1 (see, for example, FIGS. 2 to 4), the first joint surface (H1) is formed on the lower surface of the case main body (30) that houses the lubricated member, and the first joint surface ( H1) is joined to a second joint surface (H2) formed on the upper surface of the valve body (31), and oil is provided between the first joint surface (H1) and the second joint surface (H2). In the oil sump structure of the case that constitutes the path (a1 to a15) and stores oil around the valve body (31) in the lower part of the case,
A concave oil sump (41-49) extending toward the upper side of the case is provided at a portion other than the oil passages (a1-a15) inside the peripheral edge (S) of the first joint surface (H1). Forming,
Providing communication portions (41a-49a) that allow the oil sumps (41-49) to communicate with the outside of the peripheral edge portion (S) to allow oil to enter and exit from the oil sumps (41-49);
The communicating portion (41A～49a) from the first bonding surface corresponding to the bottom (H1) in the oil sump (41 to 49), is the top portion or in an opening in the oil sump (41 to 49) ing,
It is characterized by that.

The invention according to claim 2 is the oil sump structure of the case according to claim 1, wherein the communication portions (41a to 49a) have a throttle shape.
It is characterized by that.

The invention according to claim 3 is the oil sump structure of the case according to claim 1 or 2 , wherein the oil sump (41-49) and the communication part (41a-49a) are arranged along the peripheral edge (S). Provided at multiple locations,
It is characterized by that.

The invention according to claim 4 is the oil sump structure of the case according to claim 3 , wherein at least one oil sump (41) is provided on each of the front side, the rear side, the left side, and the right side of the first joint surface (H1). To 49) and the communication part (41a to 49a),
It is characterized by that.

The invention according to claim 5 is the oil reservoir structure of the case according to any one of claims 1 to 4 , wherein the case body (30) is formed by casting, and the oil reservoir (41 to 49) is formed. Forming by die casting,
It is characterized by that.

The invention according to claim 6 is the oil sump structure of the case according to claim 5 , wherein the communication portions (41a to 49a) are formed by casting.
It is characterized by that.

  In addition, although the code | symbol in said parenthesis is for contrast with drawing, it has no influence on the structure of a claim by this.

According to the first aspect of the present invention, for example, when the oil level is going to rise due to the inclination of the vehicle body, the acceleration / deceleration of the automobile, the change of the oil temperature, etc., a part of the oil flows into the oil reservoir through the communication portion. , Oil level rise is suppressed. On the other hand, when the oil level is lowered, the oil that has accumulated in the oil reservoir flows out through the communicating portion, so that the oil level is prevented from lowering. That is, rapid fluctuations in the oil level are suppressed. In addition to the case for housing the member to be lubricated and the valve body, it is superior in terms of cost reduction by reducing the number of parts and downsizing of the device, compared to the case of forming the oil sump case. In addition, since the communication portion opens from the bottom of the oil reservoir to the uppermost portion, for example, when oil flows into the oil reservoir, air does not accumulate in the upper portion of the oil reservoir and escapes out of the oil reservoir. Oil flows smoothly into the sump.

  According to the invention of claim 2, since the communicating portion has a throttle shape, the fluctuation of the oil level is further suppressed.

According to the invention of claim 3 , the oil level fluctuation can be further suppressed by providing the oil reservoir and the communication portion at a plurality of locations on the peripheral edge portion of the first joint surface.

According to the invention of claim 4 , by providing at least one oil sump and communication part on each of the front, rear, left and right of the first joint surface, the front side and the rear side are, for example, when the vehicle body is inclined in the front-rear direction, And the fluctuation | variation of the oil level at the time of acceleration / deceleration of a motor vehicle can be suppressed, and the thing of the left side and the right side can suppress the fluctuation | variation of the oil level at the time of the inclination of the vehicle body in the left-right direction, for example.

According to the invention of claim 5 , since the oil reservoir can be formed by punching at the same time as the lightening for preventing the cast hole, it is necessary to provide a special process and processing time for forming the oil reservoir. Absent.

According to the sixth aspect of the present invention, since the communicating portion can be formed by casting at the same time as the lightening for preventing the cast hole, it is not necessary to provide a special process or man-hour for forming the communicating portion. .

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, what attached | subjected the same code | symbol in each drawing has the same structure or effect | action, The duplication description about these was abbreviate | omitted suitably.

<Embodiment 1>
The oil reservoir structure of the case according to the present invention can be applied to, for example, a hybrid drive device mounted on an automobile.

  A schematic configuration of the entire hybrid drive apparatus 10 will be briefly described with reference to the skeleton diagram shown in FIG. In addition, the arrow F direction in FIG. 1 is the front side (engine side) of the automobile, and the arrow R direction is the rear side (differential device side) of the automobile.

  As shown in FIG. 1, the hybrid drive device 10 is provided with a first electric motor 11, a power distribution planetary gear 12, a second electric motor 13, and a transmission 14 in order from the front side to the rear side. These are all housed inside the case 15 and disposed around the shaft 16 (the axes of the input shaft 17 and the output shaft 18). The case 15 is integrally formed by joining a plurality of divided cases back and forth in the axial direction (direction along the axis 16). In the following description, the term “axial direction” simply refers to the direction along the axis 16. This axial direction also coincides with the axial directions of the input shaft 17, the output shaft 18, and a drive shaft 31 described later.

  The first electric motor 11 includes a stator 20 fixed to the case 15, and an inner diameter side of the stator 20 (in the following description, the position in the radial direction of the case 15 is a side closer to the shaft 16 on the inner diameter side, And a rotor 21 that is rotatably supported at the far side (referred to as the outer diameter side). The first electric motor 11 has a rotor 21 connected to a sun gear S0 of a power distribution planetary gear 12 described later. Such a first electric motor 11 mainly generates power based on power input via the sun gear S0, and drives the second electric motor 13 via an inverter (not shown), or HV The battery (hybrid drive battery: not shown) is charged.

  The power distribution planetary gear 12 is configured by a single pinion planetary gear disposed coaxially with the input shaft 17. The power distribution planetary gear 12 includes a carrier CR0 that supports a plurality of pinions P0, a sun gear S0 that meshes with the pinion P0, and a ring gear R0 that meshes with the pinion P0. In the power distribution planetary gear 12, the carrier CR 0 is connected to the input shaft 17, the sun gear S 0 is connected to the rotor 21 of the first electric motor 11, and the ring gear R 0 is connected to the output shaft 18. Such a power distribution planetary gear 12 transmits power input to the carrier CR0 via the input shaft 17 to the first electric motor 11 side via the sun gear S0 based on the rotation control of the first electric motor 11. And is distributed to the output shaft 18 side via the ring gear R0. The power distributed to the first electric motor 11 is used for power generation, while the power distributed to the output shaft 18 is used for driving an automobile.

  The second electric motor 13 includes a stator 22 fixed to the case 15 and a rotor 23 that is rotatably supported on the inner diameter side of the stator 22. As for this 2nd electric motor 13, the rotor 23 is connected with the sun gear S1 of the transmission 14 mentioned later. The second electric motor 13 is connected to the HV battery via an inverter, similarly to the first electric motor 11 described above. However, its main function is different. That is, unlike the case where the first electric motor 11 is mainly used for power generation, the second electric motor 13 mainly functions as a driving motor so as to assist the power (driving force) of the automobile. However, it functions as a generator during braking and regenerates the vehicle inertia force as electric energy.

  The transmission 14 includes a so-called Ravigneaux type planetary gear unit 24 composed of one double pinion planetary gear and a single pinion planetary gear sharing the one pinion, and further includes a first brake B1 and a first brake B1. 2 brakes B2.

  Of these, the planetary gear unit 24 includes two sun gears S1 and S2, a carrier CR1 that supports the pinion P1 and the pinion P2 that is a common long pinion, and a ring gear R1, and the two pinions P1 and P2 are included. Of these, the pinion P1 meshes with the sun gear S1 and the ring gear R1, and the pinion P2 meshes with the sun gear S2 and the pinion P1. The planetary gear unit 24 has a ring gear R1 connected to the first brake B1, and a sun gear S2 connected to the second brake B2. In the transmission 14 as a whole, the sun gear S1 as an input member is connected to the rotor 23 of the second electric motor 13 and the carrier CR1 as an output member is connected to the output shaft 18. As described later, the transmission 14 engages one of the first and second brakes B1 and B2 and releases the other, and conversely opens one and engages the other. Thus, the speed can be switched to two speed reduction stages having different speed reduction ratios. That is, the transmission 14 changes the magnitude of the power input from the second electric motor 13 via the sun gear S1 and transmits it to the output shaft 18 via the carrier CR1 and the ring gear R0. ing.

  In the hybrid drive device 10 configured as described above, the power input from the engine to the input shaft 17 is distributed to the first electric motor 11 and the output shaft 18 by the power distribution planetary gear 12. The driving force from the second electric motor 13 is transmitted to the output shaft 18 via the transmission 14. That is, the driving force from the engine and the driving force of the second electric motor 13 are combined and output to the output shaft 18.

  The oil reservoir structure of the case according to the present embodiment is applied to the lower part of the second electric motor 13.

  The oil sump structure of the case according to the present embodiment will be described with reference to FIGS. 2 is a view of the case body viewed from below, FIG. 3 is a view taken in the direction of arrows AA in FIG. 2, and FIG. 4 is a view taken in the direction of arrows BB in FIG.

  As shown in these drawings, a first bonding surface H <b> 1 is formed on the lower surface of the case body 30. In FIG. 2, the peripheral portion S of the first joint surface H1 is shown by a bold line. The peripheral edge S is curved or bent in a complicated manner, but as a whole, a closed loop is drawn. The valve body 31 joins the first joint surface H1 with the second joint surface H2 on the upper surface in the form of nectar from below. Oil passages a1 to a15 are formed between the first joint surface H1 and the second joint surface H2. 2 illustrates a portion of the oil passages a1 to a15 that is formed on the first joint surface H1 side of the case member 30, and on the second joint surface H2 side of the valve body 31. In these, portions (not shown) corresponding to these are formed. The valve body 31 houses a pressure regulating valve (not shown), a valve (not shown) for controlling the hydraulic pressure sent to the actuators for the brakes B1 and B2 (not shown), and the like.

  The lower part of the valve body 31 is covered with an oil pan 32. The case main body 30 is formed with a frame-like third joint surface H3 located below and outside the first joint surface H1 described above, and the oil pan 32 has the third joint surface. It is attached to H3 from below. Oil (operating oil, lubricating oil) O is stored in the oil pan 32. The height of the surface of the oil O, that is, the oil level OL is set to be, for example, the position shown in FIGS. 3 and 4 when the automobile is stopped on a flat ground. This position is set, for example, slightly above the first joint surface H1, that is, a position that intersects oil reservoirs 41 to 49 described later. In FIG. 2, the hatched portion on the outside of the peripheral edge portion S communicates the portion of the case body 30 in which the member to be lubricated is stored and the oil pan 32 side in the vertical direction. For example, the oil O supplied to the member to be lubricated through the valve body 31 is collected in the oil pan 32 through the through holes c1 to c6.

  The case main body 30 described above is formed of, for example, a casting. In this case, the first joint surface H1 and the oil passages a1 to a15 are finally formed smoothly by machining (cutting). In addition to the oil passages a1 to a15, the lightening portions b1 to b5 are formed inside the peripheral edge S described above. The hollow portions b1 to b5 are provided to prevent a hollow formed when the case body 30 is cast or to reduce the weight, and are formed in a concave shape upward by casting. Has been. Furthermore, in addition to the oil passages a1 to a15 and the lightening portions b1 to b5, a plurality of oil reservoirs 41 to 49 are formed inside the peripheral edge S.

  The oil reservoirs 41 to 49 are directed to the upper part of the case body 30 in the portions other than the oil passages a1 to a15 and the meat removals b1 to b5 inside the peripheral edge portion S, similarly to the above-described meat removal portions b1 to b5. This is also formed in a concave shape, and is also formed by casting like the thinned portions b1 to b5. In addition, the oil reservoirs 41 to 49 are formed with communication portions 41a to 49a, unlike the thinned portions b1 to b5.

  The communication portions 41 a to 49 a are formed so as to cut out the peripheral edge portion S, and communicate the oil reservoirs 41 to 49 described above with the outside of the peripheral edge portion S. This enables oil O to enter and exit from the periphery S to the oil reservoirs 41 to 49. These communication parts 41a-49a are opened from the 1st junction surface H1 corresponded to the lowest part of each oil sump 41-49 to the uppermost part vicinity. That is, the communication portions 41a to 49a are formed so that their height dimensions are substantially the same as the height dimensions of the respective oil reservoirs 41 to 49. Further, the communication portions 41 a to 49 a are formed shorter than the length in the direction along the peripheral edge portion S of the oil reservoirs 41 to 49. That is, it is formed in a narrow aperture shape.

  The oil reservoirs 41 to 49 and the communication portions 41 a to 49 a having the above-described configuration are the front side (left side in FIG. 2), rear side (right side in FIG. 2), and left side (upper side in FIG. 2). At least one set is arranged on each of the right side and the right side (lower side in the figure). For example, the communication part 41 is arranged on the front side, the communication parts 47 to 49 on the rear side, the communication parts 42 and 44 on the left side, and the communication parts 45 and 46 on the right side.

  Next, the operation of the oil reservoir structure according to the present embodiment, that is, the oil reservoirs 41 to 49 and the communication portions 41a to 49a will be described.

  The oil reservoirs 41 to 49 extend upwardly in a concave shape, and the oil O can enter and exit from the oil reservoirs 41 to 49 via the communication portions 41a to 49a. -If the oil level OL is going to rise due to deceleration, change in oil temperature, etc., a part of the oil O communicates with the oil sump arranged in the vicinity thereof (among the sumps 41 to 49). The oil level OL is prevented from rising. On the other hand, when the oil level OL is about to fall, the oil that has accumulated in the oil sump arranged in the vicinity of the oil level OL flows out through the communicating portion, and therefore the oil level is prevented from dropping. That is, rapid fluctuations in the oil level are suppressed. Further, since the communication portions 41a to 49a have a throttle shape, the oil O enters and exits the oil reservoirs 41 to 49 through the communication portions 41a to 49a, and thus the oil level is rapidly increased. The fluctuation is further suppressed.

  Moreover, since the communication parts 41a-49a are formed in the substantially same height as the oil reservoirs 41-49, when oil flows into the oil reservoirs 41-49 via the communication parts 41a-49a, the oil reservoirs 41-49 Since air is released without accumulating at the upper portion of 49, oil O flows smoothly.

  Furthermore, since at least one oil sump and communication portion are provided on the front and rear left and right of the first joint surface H1 (same as front and rear left and right of the peripheral edge portion S), the front and rear oil sumps and communication portions allow the vehicle body to It is possible to mitigate fluctuations in the oil level OL caused by the forward / backward inclination and the acceleration / deceleration of the automobile. Further, the fluctuation of the oil level OL caused by the inclination of the vehicle body in the left-right direction can be mitigated by the left and right oil sump and the communication portion.

  And since the oil sump 41-49 and the communication parts 41a-49a are formed by casting, compared with the case where these are formed separately, it is not necessary to provide a special process and processing time. The dividing process is simplified and the processing time is shortened.

  In the present invention, these oil reservoirs 41 to 49 and the communication portions 41a to 49 are not limited to the case of forming by casting, and may be formed by machining (cutting), for example. Of course.

It is a skeleton figure which shows schematic structure of the hybrid drive device to which the oil sump structure of the case which concerns on this invention is applied. It is the figure which looked at the case body from the lower part. It is a longitudinal section near an oil pump. It is an AA arrow directional view in FIG. It is a BB line arrow directional view in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Hybrid drive device 30 Case main body 31 Valve body 41-49 Oil sump 41a-49a
Communication portion a1 to a15 Oil passage H1 First joint surface H2 Second joint surface O Oil OL Oil level S Peripheral portion

Claims (6)

A first joint surface is formed on the lower surface of the case main body that houses the lubricated member, and the second joint surface formed on the upper surface of the valve body is joined to the first joint surface to thereby form the first joint surface. And an oil reservoir structure of the case for storing oil around the valve body in the lower part of the case.
A concave oil sump extending toward the upper side of the case is formed in a portion other than the oil passage inside the peripheral edge of the first joint surface,
Providing a communicating portion that allows the oil reservoir to communicate with the outside of the peripheral portion to allow oil to enter and exit from the oil reservoir;
The communication unit from the first bonding surface corresponding to the bottom of the reservoir the oil is the uppermost section until in the opening in reservoir the oil,
An oil sump structure of the case characterized by that. The communication part has a throttle shape,
The oil sump structure of the case according to claim 1. The oil reservoir and the communication part are provided at a plurality of locations along the peripheral edge part.
The oil sump structure of the case according to claim 1 or 2, characterized by the above-mentioned. At least one of the oil reservoir and the communication portion are provided on each of the front side, the rear side, the left side, and the right side of the first joint surface;
The oil sump structure of the case according to claim 3. The case body is formed by casting, and the oil reservoir is formed by casting.
The oil sump structure of the case according to any one of claims 1 to 4. Forming the communicating part by casting;
The oil sump structure of the case according to claim 5.

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