JP2018063031A - Lubrication structure of power transmission device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To inhibit a reduction in supply amount to a lubrication necessary part relative to a discharge amount from a discharge port even if the discharge port does not open toward the lubrication necessary part.SOLUTION: A resin baffle plate 1 attached to an inner wall of a transmission case includes: a first lubrication oil passage 34 in which lubrication oil to be supplied to a lubrication necessary part flows; a first discharge port 33 which opens toward the inner wall of the transmission case 2 and discharges the lubrication oil in the first lubrication oil passage 34; and a lubrication oil guide portion 116a facing the inner wall of the transmission case 2 and being located near an area below the first discharge port 33. In the inner wall of the transmission case 2, a guide groove 231 is provided at a position facing the first discharge port 33 and the lubrication oil guide portion 116a. The lubrication oil guide portion 116a has a facing surface facing a bottom surface 232 of the guide groove 231 and covering a part of the guide groove 231.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a lubricating structure for a power transmission device.

  Inside the transmission case, there are provided parts that require lubrication (lubricating parts) such as gear mechanisms and bearings constituting the power transmission device. As a method for supplying lubricating oil to a site requiring lubrication, a method is known in which the lubricating oil accumulated in the lower portion of the transmission case is pumped up by a ring gear of a differential gear mechanism.

  Patent Document 1 discloses a method in which a supply pipe for supplying lubricating oil is provided inside the transmission case, and the lubricating oil is directly supplied from the supply pipe to a portion requiring lubrication. The discharge port of the supply pipe opens toward the differential gear mechanism where lubrication is required, and the differential gear mechanism is directly lubricated by the lubricating oil injected from the discharge port.

JP 09-026018 A

  However, in the configuration described in Patent Document 1, since the differential gear mechanism is housed inside the differential case, the supply pipe must be provided so as to bypass the differential case. Therefore, the supply pipe becomes long and the transmission becomes heavy. Therefore, it is conceivable to shorten the supply pipe in order to reduce the weight. However, by shortening the supply pipe, there is a case where the discharge port cannot be disposed at a position facing the portion requiring lubrication. In this case, the lubricating oil cannot be directly supplied from the discharge port to the portion requiring lubrication. Further, the discharged lubricating oil scatters, and the supply amount to the site requiring lubrication with respect to the discharge amount from the discharge port decreases, and there is a possibility that a sufficient amount of lubricating oil cannot be supplied to the site requiring lubrication.

  The present invention has been made in view of the above circumstances, and even if the discharge port of the oil passage for supplying the lubricating oil to the lubrication required portion is not open toward the lubrication required portion, It is an object of the present invention to provide a lubrication structure for a power transmission device that can suppress a decrease in the supply amount to a lubrication required portion with respect to the discharge amount of the power.

  The present invention provides a lubrication structure for a power transmission device, comprising: a resin baffle plate attached to an inner wall of a transmission case; and a lubrication required portion to which lubricating oil is supplied inside the transmission case. The baffle plate is formed inside the baffle plate, and is opened so as to oppose the inner wall of the transmission case and discharges the lubricating oil passage for pumping the lubricating oil and the lubricating oil in the lubricating oil passage. And a lubricating oil guide portion located near the lower side of the discharge port and facing the inner wall of the transmission case, and the inner wall of the transmission case is connected to the discharge port. The guide groove is provided at a position facing the guide groove and guides the lubricant discharged from the discharge port to the lubrication-needed portion, and the lubricant guide portion is opposed to the bottom surface of the guide groove, Cover part And having a facing surface.

  According to the present invention, the lubricating oil discharged from the discharge port of the baffle plate can be collected in the guide groove on the transmission case side, and the lubricating oil rebounding from the guide groove can be collected in the guide groove by the lubricating oil guiding part on the baffle plate side. Can be guided. Thereby, it can suppress that the supply amount to the lubrication required part with respect to the discharge amount from a discharge outlet reduces.

FIG. 1 is a perspective view schematically showing a baffle plate constituting a lubrication structure in the embodiment. FIG. 2 is a view taken in the direction of arrow A in FIG. FIG. 3 is a partially enlarged view of FIG. FIG. 4 is a diagram schematically showing a transmission case constituting the lubrication structure in the embodiment. FIG. 5 is an enlarged perspective view of a part of the transmission case. FIG. 6 is a cross-sectional view for explaining the guide structure of the lubricating oil. FIG. 7A is a diagram for explaining the flow of the lubricating oil discharged from the first discharge port. FIG. 7B is a diagram for describing a case where the lubricating oil discharged from the first discharge port repeatedly rebounds between the transmission case and the baffle plate.

  Hereinafter, a lubricating structure of a power transmission device according to an embodiment of the present invention will be specifically described with reference to the drawings.

  FIG. 1 is a perspective view schematically showing a baffle plate 1 constituting a lubricating structure in the embodiment. FIG. 2 is a view taken in the direction of arrow A in FIG. FIG. 3 is a partially enlarged view of FIG. FIG. 4 is a diagram schematically showing the transmission case 2 constituting the lubrication structure in the embodiment. FIG. 5 is an enlarged perspective view of a part of the transmission case 2. In this description, the direction indicated by the alternate long and short dash line O in FIG. 1 is the “axial direction”, the circumference of the alternate long and short dash line O is the “circumferential direction”, and the center of the “radial direction” is on the dashed line O.

[1. Baffle plate]
The baffle plate 1 is attached to the inner wall 2a of the transmission case 2 and is a structure in which two resin members including a plate main body 11 and an oil passage member 12 are integrally formed. The baffle plate 1 is a baffle plate with an oil passage, and includes a lubricating oil passage 3 formed inside the baffle plate 1. The lubricating oil passage 3 is a supply oil passage that penetrates the baffle plate 1 and supplies (pressure-feeds) the lubricating oil to the portion requiring lubrication via the baffle plate 1. Lubricating oil in the lubricating oil passage 3 is pumped toward a portion requiring lubrication.

  The lubricating oil passage 3 includes a supply port 31 into which the lubricating oil flows, a main oil passage 32 on the supply port 31 side, a first discharge port 33 for discharging the lubricating oil, and a first lubricating oil on the first discharge port 33 side. It has a passage 34, a second discharge port 35 that discharges lubricating oil, and a second lubricating oil passage 36 on the second discharge port 35 side. The main oil passage 32, the first lubricating oil passage 34, and the second lubricating oil passage 36 are in communication. In the path from the supply port 31 to the first discharge port 33, the second lubricating oil passage 36 branches off from the main oil passage 32. The lubricating oil that has flowed in from the supply port 31 is pumped toward the first discharge port 33 and the second discharge port 35.

  As shown in FIGS. 1 and 2, the baffle plate 1 includes a cylindrical plate body 11 that is a first member and a curved plate-like oil passage member 12 that is a second member. The plate body 11 and the oil passage member 12 are integrally formed by vibration welding. For example, an oil passage groove (not shown) formed in the plate body 11 and an oil passage groove (not shown) formed in the oil passage member 12 face each other so that the plate body 11 and the oil passage member 12 are opposed to each other. Is integrated. Thereby, the lubricating oil passage 3 penetrating the inside of the baffle plate 1 is formed.

  The plate body 11 includes a cylindrical dome portion 111 having both ends opened in the axial direction, a first main oil passage formation portion 112 provided on the bottom side of the dome portion 111, and a first main oil passage formation portion 112. And a cylindrical first protrusion 113 that is formed in a series and extends from the bottom side to the top side of the dome 111, and a flat plate 114 that extends radially outward from the bottom of the dome 111, A bolt hole 115 into which a bolt attached to the transmission case 2 is screwed, a second protrusion 116 formed side by side with the first protrusion 113, and a first main oil passage forming part 112 extending radially outward. 1 branching portion 117.

  The dome part 111 is a part constituting the main body of the plate body 11. As shown in FIGS. 1 and 2, the dome portion 111 has a circular first opening 111 a that opens to the top side, and a circular second opening 111 b that opens to the bottom side. Each of the openings 111a and 111b is formed in a circular shape, and the first opening 111a has a smaller diameter than the second opening 11b. The dome portion 111 has a shape that gradually decreases in diameter from the bottom portion toward the top portion. When the baffle plate 1 is attached to the inner wall of the transmission case 2, the dome portion 111 functions as a partition wall that restricts the flow of lubricating oil between the transmission case 2 and a portion requiring lubrication (for example, a differential gear mechanism).

  The first main oil passage forming portion 112 is a portion constituting the main oil passage 32 and is a portion where the oil passage member 12 is integrated (welded). The first main oil passage forming portion 112 is formed radially outward from the second opening 111b and extends in the circumferential direction along the second opening 111b. The bottom surface of the first main oil passage forming portion 112 serves as a welding surface with the oil passage member 12. The first main oil passage forming portion 112 is provided with an oil passage groove (not shown) that is recessed from the bottom surface, and the oil passage groove extends in the circumferential direction along the second opening 111b.

  The first protrusion 113 is a part that constitutes the first discharge port 33 and the first lubricating oil passage 34. As shown in FIGS. 1 and 3, the first protrusion 113 is provided on the radially outer side of the first opening 111 a, and the tip protrudes axially outward from the first opening 111 a. A first discharge port 33 is open at the tip of the first protrusion 113. When the baffle plate 1 is attached to the inner wall of the transmission case 2, the first discharge port 33 is disposed at a position facing the inner wall 2 a of the transmission case 2.

  The flat plate portion 114 is a portion attached to the transmission case 2 and is a positioning portion of the baffle plate 1. As shown in FIGS. 1 and 2, the flat plate portion 114 protrudes radially outward from the second opening 111 b and the first main oil passage forming portion 112 and is formed in an annular shape having a predetermined length in the circumferential direction. Yes.

  The bolt hole 115 includes a first bolt hole 115a, a second bolt hole 115b, and a third bolt hole 115c. Each bolt hole 115a, 115b, 115c is provided at a position spaced apart in the circumferential direction. As shown in FIGS. 1 and 2, the first and second bolt holes 115 a and 115 b are provided in the flat plate portion 114, and the third bolt hole 115 c is provided in the second protruding portion 116.

  The second protruding portion 116 has a structure in which a fixing portion that is bolted to the transmission case 2 and a lubricating oil guiding portion 116 a that guides the lubricating oil discharged from the first discharge port 33 are integrated. As shown in FIGS. 1 and 3, the second protruding portion 116 extends from the bottom side to the top side of the dome portion 111, and protrudes so that the tip end portion is positioned on the outer side in the axial direction than the first opening portion 111 a. Yes. A third bolt hole 115c and a lubricating oil guiding portion 116a are provided at the tip portion. The lubricating oil guiding portion 116 a is located near the lower side (in the radial direction) of the first discharge port 33 and has a facing surface that faces the inner wall 2 a of the transmission case 2. The opposing surface is a flat surface and has a predetermined length along the radial direction.

  The first branch portion 117 is a portion that constitutes the second lubricating oil passage 36 and is a portion where the oil passage member 12 is integrated (welded). As shown in FIG. 1, the first branch portion 117 is a linear plate portion that extends radially outward from the first main oil passage forming portion 112. The bottom surface of the first branch portion 117 serves as a welding surface with the oil passage member 12. The first branch portion 117 is provided with an oil passage groove (not shown) that is recessed from the bottom surface. The oil passage groove of the first branch portion 117 is connected to the oil passage groove of the first main oil passage formation portion 112, and extends linearly along the direction in which the first branch portion 117 extends.

  The oil passage member 12 is connected to the cylindrical first connection portion 121 constituting the supply port 31, the second main oil passage formation portion 122 constituting the main oil passage 32, and the second protrusion 113. The connection part 123, the 2nd branch part 124 which comprises the 2nd lubricating oil path 36, and the cylindrical 3rd connection part 125 which comprises the 2nd discharge port 35 are provided.

  The 1st connection part 121 comprises the part connected with the oil path by the side of the supply side of lubricating oil. As shown in FIG. 2, the 1st connection part 121 protrudes to the axial direction outer side rather than the 2nd opening part 111b, and the supply port 31 is opening in the front-end | tip part. For example, the first connection part 121 is connected to the transmission case 2.

  The second main oil passage forming portion 122 is a curved plate portion integrated (welded) with the first main oil passage forming portion 112 of the plate body 11. As shown in FIG. 2, the second main oil passage forming part 122 is disposed on the radially outer side of the second opening 111b and extends in the circumferential direction along the second opening 111b. An upper surface (not shown) of the second main oil passage forming portion 122 serves as a welding surface with the plate body 11. The second main oil passage forming portion 122 is provided with an oil passage groove (not shown) recessed from the upper surface, and the oil passage groove extends in the circumferential direction along the second opening 111b. The oil passage groove of the second main oil passage forming portion 122 is formed in a shape corresponding to the oil passage groove of the first main oil passage forming portion 112.

  The second connecting portion 123 constitutes a portion that connects the main oil passage 32 and the first lubricating oil passage 34. As shown in FIG. 2, in the oil passage member 12, a first connection portion 121 is provided on one end side of the second main oil passage formation portion 122, and a second connection portion 123 is provided on the other end side. The upper surface (not shown) of the second connection portion 123 is welded to the bottom surface of the first protrusion 113 of the plate body 11.

  The second branch portion 124 is a portion that is integrated (welded) with the first branch portion 117 on the plate body 11 side. As shown in FIG. 2, the second branch portion 124 is formed in a shape corresponding to the first branch portion 117. An upper surface (not shown) of the second branch portion 124 serves as a welding surface with the plate body 11. The second branch portion 124 is provided with an oil passage groove (not shown) that is recessed from the upper surface. The oil passage groove of the second branch portion 124 is connected to the oil passage groove of the second main oil passage formation portion 122, and extends linearly along the direction in which the second branch portion 124 extends.

[2. Transmission case]
The transmission case 2 constitutes a case for housing a transmission mounted on the FF vehicle. For example, a cylindrical case body having both ends opened, a first cover member (front cover) attached to one opening of the case body, and a second cover member (rear cover) attached to the other opening of the case body A case for accommodating the transmission is configured. The transmission case 2 shown in FIG. 4 constitutes a cover member among the case members described above.

  As shown in FIG. 4, the transmission case 2 corresponds to a first shaft corresponding portion 21 corresponding to the input shaft (first shaft) of the transmission and an output shaft (second shaft) of the transmission. And a second axis corresponding portion 22 that is a portion corresponding to the axle (third axis). In the transmission housed in the transmission case 2, a counter shaft (idler shaft) is provided between the output shaft (second shaft) and the axle (third shaft).

  An example of a transmission housed in the transmission case 2 is a belt-type continuously variable transmission (belt-type CVT) mounted on an FF vehicle. In this case, the first shaft corresponding portion 21 corresponds to the belt-type CVT drive pulley shaft, the second shaft corresponding portion 22 corresponds to the belt-type CVT driven pulley shaft, and the third shaft corresponding portion 23 corresponds to the differential shaft (front wheel). Corresponding axle). In addition to the transmission, the transmission case 2 houses a counter gear mechanism, a differential gear mechanism, and the like. That is, the power transmission device housed in the transmission case 2 includes a transmission, a counter gear mechanism, and a differential gear mechanism. The power transmission device is a device (mechanism) that transmits power output from a power source of a vehicle to drive wheels.

  The baffle plate 1 is attached to the third axis corresponding portion 23. As shown in FIGS. 4 and 5, the inner wall 2a of the transmission case 2 is provided with a guide groove 231 for guiding the lubricating oil to the lubrication-needed portion. The guide groove 231 extends from the outside toward the inside in the radial direction of the axle. The first discharge port 33 of the plate body 11 is disposed at a position facing the guide groove 231. That is, the bottom surface 232 of the guide groove 231 is a surface that receives the lubricating oil discharged from the first discharge port 33 and is a surface that guides the discharged lubricating oil to a site requiring lubrication. A concave support portion 221 to which the first branch portion 117 of the plate body 11 is attached is formed in the second axis corresponding portion 22 of the inner wall 2a. The first branch part 117 is fitted to the support part 221.

[3. Lubricating oil guide structure]
FIG. 6 is a cross-sectional view for explaining the lubricating oil guide structure 4. As shown in FIG. 6, the guide structure 4 includes a guide groove 231 on the transmission case 2 side and a lubricating oil guiding portion 116a on the baffle plate 1 side. The guide groove 231 is provided at a position facing the first discharge port 33 on the inner wall 2 a of the transmission case 2. Thereby, the lubricating oil discharged from the first discharge port 33 can be collected by the guide groove 231. The lubricating oil guiding portion 116 a is disposed below the first discharge port 33 so as to cover a part of the guide groove 231. That is, the bottom surface 232 of the guide groove 231 and the lubricating oil guiding portion 116a face each other, and the lubricating oil guiding portion 116a has a facing surface that covers a part of the guiding groove 231. The bottom surface 232 of the guide groove 231 is a surface that receives the lubricating oil discharged from the first discharge port 33 and has a shape that is curved in the vertical direction (radial direction).

  As described above, since the bottom surface 232 is a curved surface, the lubricating oil discharged from the first discharge port 33 can smoothly flow to the lubrication required portion (BRG). 6 includes a pinion gear of a differential gear mechanism that is disposed inside the baffle plate 1. When the lubricating oil discharged from the first discharge port 33 collides with the bottom surface 232 that is a curved surface, the direction in which the lubricating oil flows (the direction in which it bounces) can be smoothly changed to the lower side (inward in the radial direction). Further, since the lubricating oil guiding part 116a is arranged so as to cover the lower part of the guide groove 231, the lubricating oil rebounding from the guiding groove 231 is caused to move to the lubricating oil guiding part 116a on the baffle plate 1 side (opposite surface to the bottom surface 232). Can be guided into the guide groove 231.

  As described above, according to the lubricating structure of the embodiment, the lubricating oil discharged from the first discharge port 33 even when the first discharge port 33 of the lubricating oil passage 3 does not face the portion requiring lubrication. Can be efficiently flowed to the site requiring lubrication by the guide structure 4. Thereby, it can suppress that the supply amount to the lubrication required part with respect to the discharge amount from the 1st discharge port 33 reduces.

  Since the guide structure 4 can guide the lubricating oil to a predetermined position (position where the lubrication required portion is disposed), the seizure resistance performance of the power transmission device is improved. In addition, since the necessary lubricating oil can be supplied, the drag torque is reduced and the fuel efficiency of the vehicle is improved. Furthermore, in order to guide the lubricating oil discharged in a direction different from a desired position (for example, a portion requiring lubrication), it is possible to guide the lubricating oil to which a new element is added. As a result, costs such as part costs and material costs can be reduced. In addition, since the guide structure is configured in a limited installation space in the transmission case 2, the power transmission device can be reduced in size and weight.

  In addition, this invention is not limited to embodiment mentioned above, In the range which does not deviate from the objective of this invention, it can change suitably.

  For example, the surface of the lubricating oil guiding portion 116a (the surface facing the bottom surface 232) is not limited to a flat surface. The surface of the lubricating oil guiding portion 116a may be formed in a dimple shape, a parallel groove extending in the vertical direction, an uneven shape, or the like. Thereby, the collision energy when the lubricating oil collides with the lubricating oil guiding portion 116a can be attenuated.

  FIG. 7A is a view for explaining the flow of the lubricating oil discharged from the first discharge port 33. FIG. 7B is a diagram for describing a case where the lubricating oil discharged from the first discharge port 33 rebounds repeatedly between the transmission case 2 and the baffle plate 1. The example shown in FIG. 7A is a case where the facing surface of the lubricating oil guiding portion 116a is a flat surface, or a case where the facing surface of the lubricating oil guiding portion 116a has a dimple shape (in the case of a non-flat surface). .

  As shown in FIG. 7A, the lubricating oil discharged from the first discharge port 33 toward the inner wall 2 a of the transmission case 2 collides with the bottom surface 232 of the guide groove 231, Rebounds to the lubricating oil guiding part 116a side. When the lubricating oil collides with the opposing surface of the lubricating oil guiding portion 116a having a dimple shape, the collision energy of the lubricating oil is attenuated. When the discharge pressure at the first discharge port 33 is large, the lubricating oil is discharged from the first discharge port 33 vigorously. In this case, if the collision energy of the lubricating oil can be effectively attenuated by the lubricating oil guiding portion 116a, the lubricating oil can be efficiently flowed to the portion requiring lubrication. On the other hand, as shown in FIG. 7B, when the collision energy of the lubricating oil cannot be effectively attenuated, the lubricating oil repeatedly splashes on the inner wall 2 a of the transmission case 2, so that the lubricating oil scatters. In this case, the supply amount to the lubrication required part (BRG) may be reduced with respect to the discharge amount from the first discharge port 33. Further, since the collision energy is not attenuated, an abnormal noise is generated due to the rebound of the lubricating oil. Therefore, according to the example shown in FIG. 7A described above, since the scattering of the discharged lubricating oil can be suppressed, it is possible to suppress a decrease in the supply amount to the lubrication required portion with respect to the discharge amount from the first discharge port 33. can do. Furthermore, the flow of the lubricating oil in the guide groove 231 can be rectified by suppressing the rebound of the lubricating oil inside the guide groove 231. Thereby, foaming of lubricating oil can be suppressed and generation | occurrence | production of what is called breather blow can be suppressed.

DESCRIPTION OF SYMBOLS 1 Baffle plate 2 Transmission case 2a Inner wall 3 Lubricating oil path 4 Guide structure 33 1st discharge port 116 2nd protrusion part 116a Lubricating oil induction | guidance | derivation part 231 Guide groove 232 Bottom

Claims (1)

In a lubricating structure of a power transmission device comprising: a resin baffle plate attached to an inner wall of a transmission case; and a lubrication required portion to which lubricating oil is supplied inside the transmission case;
The baffle plate is
A lubricating oil passage formed inside the baffle plate and pumping the lubricating oil;
A discharge port that discharges the lubricating oil in the lubricating oil passage and opens to face the inner wall of the transmission case;
A lubricating oil guiding portion located near the lower side of the discharge port and provided at a position facing the inner wall of the transmission case;
With
An inner wall of the transmission case is provided at a position facing the discharge port, and includes a guide groove that guides the lubricating oil discharged from the discharge port to the lubrication-needed portion,
The lubricating structure for a power transmission device, wherein the lubricating oil guiding portion has a facing surface that faces a bottom surface of the guide groove and covers a part of the guide groove.

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