JP2013194891A - Lubricating device of power transmission mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lubricating device of a power transmission mechanism capable of restraining aeration when an oil level is inclined while reducing the number of components.SOLUTION: A baffle plate 20 has an arched shape when viewed from a rotational axis direction of a gear G and has a baffle plate body 21 extending in a rotational axis direction, a tubular portion 22 which has an oil suction port 22c on a bottom surface side of a transmission case 11 and extends in a rotational axis direction toward a circulation passage opening 14, and a plane portion 23 which connects the tubular portion 22 with the baffle plate body 21 and extends in a rotational axis direction. The tubular portion 22 is inserted into the circulation passage opening 14.

Description

  The present invention relates to a lubrication device for a power transmission mechanism that lubricates gears with an oil pump.

  In Patent Document 1, as shown in FIGS. 8 and 9, a suction guide 103 disposed at the bottom of a case is filled with lubricating oil filled up to a height at which a part of the gear 102 housed in the case 101 is immersed. And the sucked lubricating oil is supplied from the oil pump 104 through the oil filter 105 to the gears, each part in the apparatus, and the like. In this lubrication apparatus, the suction guide 103 is disposed in front of the rotation direction of the gear 102 at the bottom of the case, so that even when the liquid level of the lubricating oil is shifted due to the agitation of the lubricating oil accompanying the rotation of the gear 102, sufficient It is described that it is possible to ensure a sufficient suction of lubricating oil.

  Further, it is described that a baffle plate 106 can be provided around the gear 102 to suppress the agitation of the lubricating oil and stabilize the liquid level.

JP 2003-130188 A

  However, in the lubricating device described in Patent Document 1, there is room for improvement in correspondence to air biting when the oil level is inclined. Further, it is necessary to manufacture the baffle plate 106 and the suction guide 103 separately, and there are problems such as the number of parts and simplification of the manufacturing process.

  The present invention has been made in view of the above problems, and an object thereof is to provide a lubricating device for a power transmission mechanism capable of suppressing the occurrence of air biting when the oil level is inclined while reducing the number of parts. To do.

In order to achieve the above object, the invention described in claim 1
A lubricating oil suction port (for example, a circulation path opening 14 in an embodiment described later) for supplying lubricating oil (for example, oil in an embodiment described later) to an oil pump (for example, an oil pump 44 in an embodiment described later) is provided. A case (for example, a mission case 11 in an embodiment described later),
At least one gear (e.g., a gear G in an embodiment described later) provided inside the case and rotatable around a rotation axis;
A baffle plate (for example, a baffle plate 20 according to an embodiment described later) disposed between the gear and the bottom surface of the case, and the lubricating oil is applied to the case so that at least a part of the gear is immersed. A lubricating device for a stored power transmission mechanism (for example, a transmission 10 according to an embodiment described later),
The baffle plate is
A baffle plate main body (for example, a baffle plate main body 21 of an embodiment described later) having an arc shape when viewed from the rotation axis direction and extending in the rotation axis direction;
The case has an opening (for example, an oil suction port 22c in an embodiment described later) on the bottom side of the case, and extends in the rotational axis direction toward the lubricating oil supply port (for example, in an embodiment described later). Tube portion 22),
Connecting the baffle plate main body and the cylindrical portion, and having a surface portion (for example, a surface portion 23 in an embodiment described later) extending in the rotational axis direction;
The cylindrical portion is inserted into the lubricating oil suction port.

Moreover, in addition to the structure of Claim 1, the invention of Claim 2 is
The surface portion includes first ribs extending in the rotation axis direction (for example, lateral ribs 37 and 38 in the embodiment described later) and second ribs extending in a direction orthogonal to the first rib (for example, in an embodiment described later). Vertical ribs 34, 35, 36).

Moreover, in addition to the structure of Claim 2, the invention of Claim 3 is
The first rib and the second rib are arranged on one side of the surface portion (for example, one side 23a of the embodiment described later),
One side surface of the surface portion faces the wall portion of the case (for example, a boss 15 in an embodiment described later) across the first rib and the second rib.

Moreover, in addition to the structure of any one of Claims 1-3, invention of Claim 4 is provided.
The gear is characterized in that it is located at the lowest position in the vertical direction among the plurality of gears constituting the speed change mechanism.

Moreover, in addition to the structure of any one of Claims 1-4, invention of Claim 5 is provided,
The cylindrical portion is press-fitted into the lubricating oil suction port,
The cylindrical portion is provided with a press-fitting rib (for example, a press-fitting rib 39 in an embodiment described later) that is crushed when pressed into the lubricating oil suction port in a vertically downward direction.

According to the first aspect of the present invention, the cylindrical portion as a suction guide extending in the rotation axis direction is integrally formed on the baffle plate, and the opening portion opened to the bottom surface side of the case is provided in the cylindrical portion. Even when the oil surface of the lubricating oil is inclined, the occurrence of air biting can be suppressed without the opening being exposed from the lubricating oil.
In addition, since the baffle plate can be fixed to the case by inserting the cylinder part into the lubricating oil suction port, the cylinder part can also function as a fixing clip, and it is manufactured by reducing the number of clips. The process can be simplified.
Conventionally, it has been necessary to manufacture the suction guide and the baffle plate separately, but since the cylindrical portion as the suction guide is integrally formed in the baffle plate body, the number of parts can be reduced while simplifying the manufacturing process. it can.

  According to invention of Claim 2, the rigidity of a surface part can be improved. Thereby, a cylinder part can be easily press-fitted in a lubricating oil supply port.

  According to the third aspect of the present invention, the side surface of the surface portion of the baffle plate on which the first and second ribs are formed is opposed to the wall portion of the case, so that the flow of the lubricating oil stored in the case can be reduced. It can be adjusted along the wall. Moreover, since the 1st rib and 2nd rib which are formed in a surface part interfere with the lubricating oil which flows, the flow velocity of lubricating oil can be reduced.

  According to the fourth aspect of the present invention, the baffle plate can be reduced in size by integrally forming the cylindrical portion as the suction guide on the baffle plate provided in the lowermost gear.

  According to the invention of claim 5, since the press-fitting rib is crushed when the cylinder part is press-fitted into the lubricating oil suction port, the cylindrical part is fitted into the lubricating oil suction port without any gap, and the oil level is inclined. Even in this case, the occurrence of air biting is suppressed.

It is a figure which shows the power transmission mechanism for motor vehicles provided with the lubricating device which concerns on this invention, (a) is the figure which looked at the 1st case and the transmission mechanism from the inside, (b) looked at the 2nd case from the inside. It is a figure. It is the sectional view on the AA line of Fig.1 (a). It is the perspective view which looked at the baffle plate from diagonally upward. It is the perspective view which looked at the baffle plate from diagonally downward. FIG. 3 is a sectional view taken along line B-B in FIG. 2. It is a figure which shows the modification of a rib. (A) is a figure which shows the modification of a cylinder part, (b) is CC sectional view taken on the line of (a). 2 is a cross-sectional view of a lubricating device described in Patent Document 1. FIG. It is the DD sectional view taken on the line of FIG.

  Hereinafter, an embodiment of a lubricating device for a power transmission mechanism (hereinafter referred to as a transmission) according to the present invention will be described with reference to FIGS.

  As shown in FIGS. 1A and 1B, an automobile transmission 10 rotates in a direction perpendicular to the paper surface inside a transmission case 11 formed by a first case 11A and a second case 11B. A transmission mechanism including a first main shaft MS1, a second main shaft MS2, an idle shaft IS, a counter shaft CS, a reverse shaft RS, and a differential device D serving as axes, and a motor (not shown) are arranged. As shown by the arrows in FIG. 1, the transmission 10 has the differential device D side forward and the reverse shaft side forward and backward with the left and right sides of the paper in the vertical direction. It arrange | positions so that it may become back. Therefore, the rotation axis of each shaft is parallel to the vehicle width direction of the vehicle, and in the following description, the vehicle width direction means the rotation axis direction.

  Power from an engine and / or motor (not shown) is input from the first main shaft MS1 and can be output to the countershaft CS. Further, the power input to the first main shaft MS1 can be input to the second main shaft MS2 via the idle shaft IS, and the power input to the second main shaft MS2 can be output to the counter shaft CS. Composed. Further, the power input to the first main shaft MS1 is configured to be transmitted to the reverse shaft RS, and is configured to be output from the reverse shaft RS to the counter shaft CS via the idle shaft IS and the second main shaft MS2. . Each shaft is provided with a shift for switching the meshing between a gear (only some of the gears are shown in FIG. 1A) and the gear can be selected and the power transmission path can be switched. Yes. The power transmitted to the countershaft CS is input to the differential device D and output to a wheel (not shown).

  Referring also to FIG. 2, an oil reservoir 12 that stores oil that serves both for lubrication and motor cooling and an oil circulation path 13 that supplies oil to an oil strainer (not shown) are formed at the bottom of the mission case 11. The circulation path opening 14 of the oil circulation path 13 opens toward the left side in the vehicle width direction. In the oil reservoir 12, at least a part of the gear G provided on the second main shaft MS2 positioned at the lowest position in the vertical direction is immersed in the oil. The oil supplied from the oil circulation path 13 passes through an oil strainer (not shown) and is collected from the suction pipe 42 to the oil pump 44 disposed at the upper part of the transmission case 11, and from the oil pump 44 to the lubrication pipe 46. It is supplied to each shaft, the meshing part of the gear, and the like.

  A baffle plate 20 is provided on the second main shaft MS2 positioned at the lowest position in the vertical direction so as to surround the lower side of the gear G formed on the second main shaft MS2. As shown in FIGS. 3 and 4, the baffle plate 20 has an arc shape when viewed from the vehicle width direction, and a baffle plate main body 21 extending in the vehicle width direction and a vehicle width positioned below the baffle plate main body 21. A cylindrical portion 22 that extends in the direction and a substantially rectangular surface portion 23 that connects the baffle plate main body 21 and the cylindrical portion 22 and extends in the vehicle width direction are integrally formed.

  The baffle plate body 21 functions to reduce the rotational resistance of the gear G by scattering the internal oil by the rotation of the gear G formed on the second main shaft MS2, and lowering the oil level in the baffle plate body 21. Plays. Reference numerals 25 and 26 are clips for fixing the baffle plate 20 to the mission case 11.

  The cylindrical portion 22 has a hollow shape, the front end portion 22a is press-fitted into the circulation passage opening portion 14 of the oil circulation passage 13 formed at the bottom of the transmission case 11, and the rear end portion 22b is oil that opens to the bottom surface side. A suction port 22c is formed. Therefore, since the oil stored in the oil reservoir 12 is sucked up from the oil suction port 22c and flows into the oil circulation path 13, the cylinder portion 22 functions as a suction guide.

  The surface portion 23 connecting the baffle plate main body 21 and the cylindrical portion 22 is formed with three vertical ribs 34, 35, 36 extending in the vertical direction with a predetermined width on one side surface 23a of the surface portion 23, and further two on the rear side. Two horizontal ribs 37 and 38 having the same width and extending in the vehicle width direction are formed between the vertical ribs 35 and 36. That is, the vertical ribs 34, 35, 36 and the horizontal ribs 37, 38 extend in a direction orthogonal to each other. As shown in FIG. 5, one side surface 23 a of the surface portion 23 is disposed so as to face the boss 15 formed at the approximate center in the front-rear direction of the bottom portion of the mission case 11.

  The baffle plate 20 configured in this manner has the clip 25 attached to the clip fastening portion 16 (see FIG. 1A) formed on the side wall of the first case 11A, and the cylindrical portion 22 in the circulation path opening 14. The front end 22a is press-fitted to be fixed to the first case 11A. Further, when the second case 11B is attached to the first case 11A, the clip 26 is attached to the clip fastening portion 17 (see FIG. 1B) formed on the side wall of the second case 11B, so that the second case 11B is also fixed.

  In the lubrication device of the transmission 10 configured as described above, by operating the oil pump 44, oil is supplied to each shaft, gear meshing portion, and the like through the lubrication pipe 46 and is stored in the oil reservoir 12. The oil being collected is recovered by the oil pump 44 through the oil circulation path 13, the oil strainer, and the suction pipe 42 from the oil suction port 22 c provided below the cylinder portion 22. By circulating the oil in this way, lubrication of the speed change mechanism and cooling of the motor are realized.

Here, the oil level of the oil stored in the oil reservoir 12 during turning will be described with reference to FIG.
In FIG. 2, an alternate long and short dash line P indicates the oil level when turning left, and an alternate long and short dash line Q indicates the oil level when turning right.
When turning left, the oil level is inclined from the right side of the vehicle to the left of the vehicle so that oil is stored on the right side of the vehicle due to centrifugal force. The oil level is inclined from the left to the right of the vehicle. Here, since oil flows to the left of the vehicle when turning right, if there is no cylindrical portion 22, the circulation path opening 14 of the oil circulation path 13 may be exposed from the oil surface, and air engagement may occur.

  On the other hand, in the present invention, the cylindrical portion 22 is formed integrally with the baffle plate body 21, and the oil suction port 22c is formed so as to open to the bottom side at the rear end portion 22b of the cylindrical portion 22. Since the oil suction port 22c is always located in the oil even during rotation, the occurrence of air biting is suppressed. In this way, even when the vehicle turns in any direction, the oil suction port 22c is not exposed from the oil during turning, and the occurrence of air biting is suppressed, so that smooth oil circulation is performed. . The occurrence of air biting can also be prevented by increasing the amount of oil stored in the oil reservoir 12, but if the amount of oil is increased, the lifting loss and dragging loss due to the rotation of the gear will increase and the efficiency will decrease. According to the present invention, it is possible to suppress the occurrence of air biting without increasing the amount of oil.

Next, the oil level of the oil stored in the oil reservoir 12 at the time of sudden deceleration or climbing will be described with reference to FIG.
In the figure, an alternate long and short dash line R indicates the oil level during sudden deceleration or climbing. When suddenly decelerating or climbing a slope, the oil level is inclined from the front of the vehicle to the rear of the vehicle so that the oil is stored behind the vehicle, and the oil on the differential device D side of the oil reservoir 12 passes over the boss 15 and flows toward the transmission mechanism. However, at this time, since the surface portion 23 of the baffle plate 20 is disposed so as to face the boss 15, the oil is received by the one side surface 23 a of the surface portion 23 as indicated by an arrow in the drawing, Will flow along.

  Further, since two lateral ribs 37 and 38 having a predetermined width and extending in the vehicle width direction are formed on one side surface 23a of the surface portion 23, the oil is transferred from the differential device D side of the oil reservoir 12 to the speed change mechanism side. The flowing oil interferes with the two lateral ribs 37 and 38 and is decelerated. As a result, a large amount of oil is suppressed from flowing from the front to the rear of the vehicle in the mission case 11 at a time, so that the oil flows toward the oil inlet 22c even when the oil level fluctuates, Is suppressed.

  The shape, width, number, etc. of the vertical ribs 34, 35, 36 and the horizontal ribs 37, 38 can be arbitrarily set. Moreover, as shown in FIG. 6, you may change the angle of a rib. Here, of the lateral ribs 37, 38, the upper lateral rib 37 is formed so as to be inclined downward from the rear to the front. As a result, the inflow area is gradually reduced from the upper side to the lower side by the boss 15 and the lateral rib 37, so that the oil flow from the differential device D side of the oil reservoir 12 to the transmission mechanism side can be made smoother.

  As described above, according to the present embodiment, since the cylindrical portion 22 as a suction guide is integrally formed with the baffle plate main body 21, the number of parts can be reduced while simplifying the manufacturing process. Further, since the cylinder portion 22 is provided with the oil suction port 22c that opens to the bottom surface side of the transmission case 11, the oil level of the oil stored in the transmission case 11 is inclined when the vehicle turns or the like. In addition, the occurrence of air biting can be suppressed without the oil suction port 22c being exposed from the oil.

  Furthermore, since the baffle plate 20 can be fixed to the transmission case 11 by press-fitting the cylindrical portion 22 into the circulation path opening 14, the cylindrical portion 22 can also function as a fixing clip. By reducing the number, the manufacturing process can be simplified. At this time, since the rigidity is ensured by the longitudinal ribs 34, 35, 36 and the lateral ribs 37, 38 provided on the surface portion 23 connecting the baffle plate body 21 and the cylindrical portion 22, press-fitting can be easily performed. it can.

  Further, the surface portion 23 functions to adjust the flow of oil stored in the oil reservoir 12 so as to face the wall surface of the boss 15 and the like of the mission case 11 along the wall surface of the mission case 11, 38 functions to reduce the flow rate of oil, so that a large amount of oil can be prevented from flowing at one time, and even when the oil level fluctuates, the oil flows toward the oil suction port 22c, and air biting occurs. Is suppressed.

In addition, this invention is not limited to embodiment mentioned above, A deformation | transformation, improvement, etc. are possible suitably.
For example, as shown in FIGS. 7A and 7B, a press-fitting rib 39 is formed on the tip side of the cylindrical portion 22a and in a portion where the circulation passage opening 14 of the oil circulation passage 13 abuts when pressed downward in the vertical direction. May be provided. As a result, the press-fitting rib 39 is crushed when the cylinder part 22 is press-fitted into the circulation path opening 14, so that the cylinder part 22a is fitted into the circulation path opening 14, and particularly in the vertical direction above the cylinder part 22a. A gap is prevented from being formed between the circulation path opening 14 and the occurrence of air biting is suppressed even when the oil level is inclined.

10 Transmission (Power transmission mechanism)
11 Mission Case (Case)
14 Circulation path opening (lubricating oil suction port)
15 Boss (wall)
20 Baffle plate 21 Baffle plate body 22 Cylinder 22c Oil inlet (opening)
23 Surface portion 23a One side surface 34, 35, 36 Vertical rib (second rib)
37, 38 Horizontal rib (first rib)
39 Press-fit rib 44 Oil pump G Gear

Claims (5)

A case provided with a lubricating oil inlet for supplying lubricating oil to the oil pump;
At least one gear provided inside the case and rotatable about a rotation axis;
And a baffle plate disposed between the gear and the bottom surface of the case, wherein the lubricating oil is stored in the case so that at least a part of the gear is immersed. And
The baffle plate is
A baffle plate main body having an arc shape when viewed from the rotation axis direction and extending in the rotation axis direction;
A cylindrical portion having an opening on the bottom side of the case and extending in the rotational axis direction toward the lubricating oil supply port;
Connecting the baffle plate main body and the cylindrical portion, and having a surface portion extending in the rotational axis direction;
A lubricating device for a power transmission mechanism, wherein the cylindrical portion is inserted into the lubricating oil suction port.   2. The lubricating device for a power transmission mechanism according to claim 1, wherein the surface portion includes a first rib extending in a direction of the rotation axis and a second rib extending in a direction orthogonal to the first rib. The first rib and the second rib are disposed on one side of the surface portion,
3. The lubricating device for a power transmission mechanism according to claim 2, wherein one side surface of the surface portion faces the wall surface of the case with the first rib and the second rib interposed therebetween.   The power transmission mechanism lubrication device according to any one of claims 1 to 3, wherein the gear is positioned at a lowest position in a vertical direction among a plurality of gears constituting the speed change mechanism. The cylindrical portion is press-fitted into the lubricating oil suction port,
The power according to any one of claims 1 to 4, wherein the cylindrical portion is provided with a press-fitting rib that is crushed when pressed into the lubricating oil suction port vertically downward. Lubricator for transmission mechanism.

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