JP2019113164A - Power transmission - Google Patents

Abstract

To provide a power transmission capable of reducing the spin loss during rotation of a rotary member while ensuring the lubricity of a bearing member that rotatably supports the rotary member when the rotary member is not rotating or rotating at extremely low speed.SOLUTION: A power transmission comprises: a case in which lube oil is stored; a rotary member, the lower part of which is immersed in lube oil and rotatably accommodated in the case; and a plate member disposed with a gap interposed between at least the lower axial end face of the rotary member. A part of the plate member is provided with a capacity part having a plate thickness larger than that of the other portion. The plate member is displaceable with rotation of the rotary member; the capacity part is immersed in lube oil when the rotary member is not rotating; and due to the displacement of the plate member when the rotary member rotates, the capacity part is positioned above the oil level of the lube oil.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a power transmission device.

  BACKGROUND ART A power transmission device having a rotating member such as a transmission or a differential device is mounted on a vehicle such as an automobile. In the power transmission system, lubricating oil is stored in the case of the power transmission system, for example, in order to ensure the lubricity of the bearing member that supports the rotating member. In the power transmission device, it is required to reduce spin loss (drive loss) in order to reduce the fuel consumption and the power consumption rate of the vehicle. In order to reduce the spin loss, it is effective to reduce the drag torque of the lubricating oil. For this reason, the agitation resistance of the lubricating oil applied to the rotating member is reduced by providing a baffle plate around the rotating member or lowering the oil level of the lubricating oil.

  For example, Patent Document 1 discloses a lubricating structure of a vehicle transmission that introduces lubricating oil in a converter case to a differential device to lubricate it due to the rotational movement of the ring gear, and is disposed to cover the ring gear. A lubricating structure is disclosed having a baffle plate capable of separating a ring gear from the oil surface of the inner lubricating oil. In Patent Document 1, the baffle plate is provided with a support means for supporting the distance from the ring gear constant, so that when the ring gear scrapes the lubricant oil in the converter case, the ring gear is not scraped off the lubricant oil more than necessary. Agitation resistance can be reduced.

JP 2012-62995 A

  Here, lubricating oil is supplied to a bearing member that supports the rotating shaft of a rotating member such as a ring gear in order to ensure the lubricity of the sliding portion. The height of the oil surface of the lubricating oil is at least from the position of the lower end of the bearing member so that the lubricity of the sliding portion can be ensured even when the vehicle is stopped for a long time and restarted. Also needs to be set on. That is, the height of the oil surface of the lubricating oil is determined from the layout of the power transmission device and can not be lowered freely. Even under such limitation, if it is possible to reduce the drag torque of the lubricating oil due to the rotation of the rotating member, it is possible to further reduce the spin loss of the power transmission device.

  Therefore, the present invention has been made in view of the above problems, and an object of the present invention is to lubricate a bearing member for rotatably supporting a rotating member when the rotating member is not rotating or when rotating at a very low speed. It is an object of the present invention to provide a new and improved power transmission device capable of reducing the spin loss at the time of rotation of the rotating member while securing the torque.

  To solve the above problems, according to one aspect of the present invention, a case in which lubricating oil is stored, a rotating member in which a lower portion is immersed in lubricating oil and axially rotatably housed in the case, and a rotating member And a plate member disposed with a gap interposed between at least the lower axial end face of the plate member, and a portion of the plate member is provided with a capacity portion larger in plate thickness than other portions, and the plate member Is displaceable with the rotation of the rotating member, and the capacity part is immersed in the lubricating oil when the rotating member is not rotating, and is positioned above the oil surface of the lubricating oil by the displacement of the plate member when the rotating member rotates. A power transmission device is provided.

  The plate member may be rotatable along the rotational direction of the rotating member by the flow of lubricating oil generated as the rotating member rotates.

  The plate member may be axially rotatable coaxially with the rotating member.

  The capacity portion may be provided on the tip side in the rotation direction of the plate member.

  The volume portion may be provided on the surface of the plate member opposite to the surface facing the rotating member.

  The specific gravity of the volume part may be larger than the specific gravity of the lubricating oil.

  A stopper may be provided to define the maximum displacement position of the plate member.

  The plate member may be a baffle plate.

  As described above, according to the present invention, the spin loss during rotation of the rotating member is reduced while securing the lubricity of the bearing member that rotatably supports the rotating member during non-rotation or extremely low speed rotation of the rotating member. can do.

It is an explanatory view showing composition of a power transmission device concerning an embodiment of the invention. It is a sectional view showing the composition of the power transmission device concerning the embodiment. It is a perspective view which shows the baffle plate with which the power transmission device which concerns on the embodiment was equipped. It is a top view which shows the baffle plate with which the power transmission device which concerns on the embodiment was equipped. It is an explanatory view showing operation of a baffle plate. It is explanatory drawing which shows the structural example which prescribes | regulates the largest displacement position of a baffle plate.

  The present invention will now be described more fully with reference to the accompanying drawings, in which exemplary embodiments of the invention are shown. In the present specification and the drawings, components having substantially the same functional configuration will be assigned the same reference numerals and redundant description will be omitted.

<1. General Configuration Example of Power Transmission Device>
FIG.1 and FIG.2 is explanatory drawing which shows a structure of the power transmission device 10 which concerns on this embodiment. FIG. 1 is a schematic view of the power transmission device 10 as viewed along the rotation axis X of the rotary member 20, and FIG. 2 is a schematic view of a cross section taken along line I-I of FIG. 1 and 2 show the inoperative state of the power transmission device 10, that is, the state in which the rotating member 20 is not rotationally driven.

  The power transmission device 10 includes a case 11, a rotating member 20, and a baffle plate 30. The rotating member 20 is housed inside the case 11 and is rotatably supported by the case 11. The rotating member 20 has shaft portions 21 a and 21 b extending on both sides of the rotation axis X. The respective shaft portions 21a and 21b are supported by the case 11 by bearing members 23a and 23b. Thus, the rotating member 20 is rotatably supported with respect to the case 11.

  The power transmission device 10 may be, for example, a front differential device that distributes driving force to the left and right front wheels of the vehicle. In this case, the rotating member 20 corresponds to a ring gear engaged with a drive pinion gear (not shown) inside the case (differential case) 11. A drive shaft (not shown) is integrally formed on the drive pinion gear, and when the power of the engine is transmitted to the drive shaft via the propulsion shaft, the drive pinion gear is rotated and the ring gear is rotated accordingly. The drive pinion gear is rotatably supported on the case 11 by, for example, a bearing member (not shown).

  The power transmission device 10 to which the present invention can be applied is not limited to the front differential device, but may be a center differential device or a rear differential device. Alternatively, the power transmission device 10 may be a continuously variable transmission (CVT) having a pulley as a rotating member.

  Lubricant oil that lubricates the power transmission 10 is stored inside the case 11. The oil level of the lubricating oil is indicated by the broken line O in FIGS. 1 and 2. The oil surface O of the lubricating oil is set to such a height that at least the lower ends of the bearing members 23a and 23b are immersed in the lubricating oil when the power transmission device 10 is not in operation. The lower portion of the rotating member 20 is immersed in the lubricating oil, and when the rotating member 20 rotates, the lubricating oil is scraped up by the rotating member 20. As a result, lubricating oil is supplied to the outer surface of the rotating member 20, and the contact portion between the rotating member 20 and other members is lubricated.

  The baffle plate 30 covers the lower part of the rotating member 20 and reduces the agitation resistance of the lubricating oil applied to the rotating member 20. The baffle plate 30 which concerns on this embodiment comprises the container of a fan shape as a whole, and can accommodate the lubricating oil scraped up with rotation of the rotation member 20. As shown in FIG. The baffle plate 30 has barrels 33 a and 33 b extending on both sides of the rotation axis X of the rotating member 20. The respective barrels 33a and 33b are rotatably supported by the bearing members 35a and 35b with respect to the case 11. The baffle plate 30 and the rotating member 20 are rotatably supported on the same rotation axis X independently of each other.

<2. Baffle plate>
Hereinafter, the configuration of the baffle plate 30 provided in the power transmission device 10 according to the present embodiment will be described in detail. 3 and 4 are explanatory views showing the baffle plate 30. FIG. FIG. 3 is a perspective view of the baffle plate 30, and FIG. 4 is a plan view of the baffle plate 30 of FIG. 3 as viewed from above.

  The baffle plate 30 according to the present embodiment corresponds to the plate member of the present invention. The baffle plate 30 has fan-shaped side surface portions 31a and 31b respectively disposed on both end surfaces of the rotating member 20, and a circumferential surface portion 32 disposed on the outer peripheral portion of the rotating member 20 and connecting the two side surface portions 31a and 31b. The cylindrical portions 33a and 33b extend outward from the side portions 31a and 31b, respectively. The baffle plate 30 may be a molded body formed of, for example, a resin material, or may be a structure formed by bonding metal plates.

  In addition, although the baffle plate 30 which concerns on this embodiment is connected as two sector parts 31a and 31b by the circular-arc-shaped peripheral surface part 32, and is comprised as a fan-shaped container, one or several opening is carried out to a peripheral surface part. May be provided.

  The axial cylindrical portions 33a and 33b are portions supported by the bearing members 35a and 35b (see FIG. 2), and also function as a rotation axis of the baffle plate 30. Thus, the baffle plate 30 is rotatably supported with respect to the case 11. At this time, the baffle plate 30 is supported by the bearing members 35a and 35b in a state where the rotational resistance is relatively small.

  At one end portion of the baffle plate 30, there are provided capacity portions 34a and 34b whose plate thickness is larger than that of the other portions. In the present embodiment, capacitance portions 34a and 34b are provided at one end of the fan-shaped side portions 31a and 31b. The end where the capacitive portions 34 a and 34 b are provided corresponds to the end on the tip side along the rotation direction of the rotating member 20. The illustrated capacitive portions 34a and 34b have a circular planar shape, and are provided on the surface of the side portions 31a and 31b opposite to the surface facing the rotating member 20. The capacitive portions 34a and 34b may be integrally formed with the side portions 31a and 31b, or the capacitive portions 34a and 34b formed separately from the side portions 31a and 31b may be joined to the side portions 31a and 31b.

  By providing the capacity portions 34a and 34b at one end of the baffle plate 30, in the non-operation state of the power transmission device 10, the end provided with the capacity portions 34a and 34b by the weight of the capacity portions 34a and 34b. The part side moves downward, and at least a part of the volume parts 34a and 34b is immersed in the lubricating oil (see FIG. 1). As a result, the oil level O of the lubricating oil rises. The oil surface O of the lubricating oil is set so that the lower ends of the bearing members 23a and 23b supporting the rotating member 20 are at a height position where they are immersed in the lubricating oil in a state where the volume portions 34a and 34b are immersed in the lubricating oil. Be done.

  FIG. 5 is an explanatory view showing a state in which the power transmission device 10 operates and the rotating member 20 is rotationally driven. The rotating member 20 is rotating in the counterclockwise direction as illustrated. At this time, the lubricating oil in the baffle plate 30 is rotated by the rotating member 20, and the baffle plate 30 is dragged by the flow of the lubricating oil, whereby the baffle plate 30 is rotated in the counterclockwise direction. Then, the volumes 34a and 34b provided at one end of the baffle plate 30 move upward from the oil surface O of the lubricating oil, and the oil surface O of the lubricating oil is lowered.

  As a result, the immersion amount of the rotary member 20 in the lubricating oil can be reduced, and the drag torque of the lubricating oil applied to the rotary member 20 can be reduced. Therefore, the spin loss of the power transmission device 10 can be reduced. Also in this state, since the lubricating oil is scraped up by the rotating member 20 and supplied to the sliding portions of the bearing members 23a and 23b, the lubricity of the sliding portions is secured.

  It is preferable that the specific gravity of at least the volume parts 34a and 34b be larger than the specific gravity of the lubricating oil. Since the specific gravity of the capacity portions 34a and 34b is larger than the specific gravity of the lubricating oil, the capacity portions 34a and 34b can be reliably moved downward and immersed in the lubricating oil when the rotating member 20 is not rotating. As a result, the oil surface O of the lubricating oil rises, and at least the lower ends of the bearing members 23a and 23b can be immersed in the lubricating oil.

  As the volumes of the volume portions 34a and 34b increase, the degree of decrease in the oil surface O of the lubricating oil when the volume portions 34a and 34b move above the oil surface O of the lubricating oil increases, and is applied to the rotating member 20. The reduction effect of the drag torque of the lubricating oil can be increased. However, when the specific gravity of the capacity portions 34a and 34b is relatively large, when the volume of the capacity portions 34a and 34b is increased, the rotational resistance of the baffle plate 30 becomes large, and the capacity portions 34a and 34b become larger than the oil surface O of the lubricating oil It may be difficult to move it upwards. For this reason, the volume of the capacity portions 34a and 34b may be reduced by the drop of the oil surface O of the lubricating oil which may be reduced or the baffle plate 30 rotated by being dragged by the lubricating oil rotated with the rotation of the rotating member 20. It is preferable to set appropriately in consideration of rotational resistance and the like.

  The planar shape of the capacitive portions 34a and 34b is not limited to a circular shape, and may be a rectangular shape or other different shapes. Further, in the present embodiment, the capacitive portions 34a and 34b are provided on the side opposite to the surface facing the rotating member 20 in the side portions 31a and 31b, but the positions where the capacitive portions 34a and 34b are provided are the same. It is not limited to the position. The capacitive portions 34 a and 34 b may be provided on the surface of the side surface portions 31 a and 31 b facing the rotating member 20, and may be provided on the outer surface or the inner surface of the circumferential surface portion 32.

  However, when the capacitive portions 34 a and 34 b are provided on the side surfaces 31 a and 31 b or the surface of the circumferential surface portion 32 facing the rotating member 20, the distance between the capacitive portions 34 a and 34 b and the rotating member 20 decreases. Spin loss may increase. For this reason, it is preferable that the capacitive portions 34 a and 34 b be provided on the side opposite to the side of the side surface 31 a or 31 b or the circumferential surface 32 facing the rotating member 20.

  Also, the power transmission device 10 may include a stopper that defines the maximum displacement position of the baffle plate 30 as the rotating member 20 rotates. The baffle plate 30 can reduce the oil level O by rotating until the volume portions 34 a and 34 b are positioned above the oil level O of the lubricating oil with the rotation of the rotation member 20, and the volume portion Even if 34a and 34b move upward further, they do not affect the effect of lowering the oil level O. On the other hand, when the drag of the lubricating oil is large under some conditions, such as a low temperature condition where the viscosity of the lubricating oil is large, for example, the baffle plate 30 is rotated by one rotation as the rotating member 20 rotates, and the volume portions 34a, 34b May return to the original position. Therefore, by defining the maximum displacement position of the baffle plate 30, it is possible to stably lower the oil level O during rotation of the rotating member 20.

  FIG. 6 is an explanatory view showing a configuration example for defining the maximum displacement position of the baffle plate 30. As shown in FIG. In the example illustrated in FIG. 6, an overhanging portion 37 that protrudes outward from the circumferential surface portion 32 of the baffle plate 30 is provided at one end of the baffle plate 30 in which the capacity portions 34 a and 34 b are provided. Further, in the case 11, a stopper portion 13 is provided at a position where the overhanging portion 37 of the baffle plate 30 can abut. Therefore, when the baffle plate 30 is rotated with the rotation of the rotating member 20, the overhanging portion 37 of the baffle plate 30 abuts against the stopper portion 13 of the case 11, and the baffle plate 30 is further rotated. Limited

  At the maximum displacement position of the baffle plate 30 where the overhanging portion 37 abuts on the stopper portion 13, the capacity portions 34a and 34b are positioned above the oil level O of the lubricating oil. Therefore, the amount of immersion of the rotating member 20 in the lubricating oil can be reduced in the rotating state of the rotating member 20, and the drag torque of the lubricating oil applied to the rotating member 20 can be reduced. On the other hand, since the baffle plate 30 does not rotate once and the capacity portions 34a and 34b do not return to the original position, the oil level O can be stably lowered during the rotation of the rotating member 20.

  The configuration example of the stopper for defining the maximum displacement position of the baffle plate 30 is not limited to the example shown in FIG. It is sufficient that a stopper that abuts against a part of the baffle plate 30 that rotates with the rotation of the rotation member 20 be provided in a part of the case 11 or inside the case 11.

  As described above, in the power transmission device 10 according to the present embodiment, the capacity portions 34 a and 34 b are provided in a part of the baffle plate 30 and dragged by the lubricating oil that is rotated with the rotation of the rotating member 20. The baffle plate 30 is provided to rotate. The capacity portions 34a and 34b of the baffle plate 30 are immersed in the lubricating oil when the rotating member 20 does not rotate, and are positioned above the oil surface O of the lubricating oil by the rotation of the baffle plate 30 when the rotating member 20 rotates. It is supposed to be.

  Therefore, while the rotating member 20 is not rotating or rotating at a very low speed, the oil level O rises by immersion of the capacity portions 34a and 34b, and at least the lower ends of the bearing members 23a and 23b supporting the rotating member 20 It can be immersed in lubricating oil. On the other hand, when the rotating member 20 rotates, the volume portions 34a and 34b are positioned above the oil surface O of the lubricating oil, thereby reducing the volume integrated oil surface O of the volume portions 34a and 34b, thereby reducing lubricating oil. The immersion amount of the rotation member 20 can be reduced. Thereby, the stirring resistance of the lubricating oil applied to the rotating member 20 is reduced, and the spin loss of the power transmission 10 can be reduced.

  Further, in the power transmission device 10 according to the present embodiment, the baffle plates 30 are provided with the capacity portions 34 a and 34 b, and the baffle plate 30 is configured to be axially rotatable coaxially with the rotation member 20. Therefore, it is possible to reduce the spin loss of the power transmission device 10 while securing the lubricity of the bearing members 23a and 23b of the rotating member 20 without significantly increasing the number of parts or requiring electrical control. it can. Further, since the baffle plate 30 can be rotated coaxially with the rotating member 20, the drag torque of the lubricating oil can be kept relatively small.

  Further, in the power transmission device 10 according to the present embodiment, the capacity portions 34 a and 34 b are provided on the surface of the baffle plate 30 opposite to the surface facing the rotating member 20. For this reason, it is possible to suppress an increase in agitation resistance caused by the capacity portions 34 a and 34 b coming too close to the rotating member 20.

  Further, in the power transmission device 10 according to the present embodiment, at least the specific gravity of the capacity portions 34a and 34b may be larger than the specific gravity of the lubricating oil. Thus, when the rotating member 20 is not rotating, the capacity portions 34a and 34b can be immersed in the lubricating oil by the weight of the capacity portions 34a and 34b, and the oil surface O of the lubricating oil can be reliably raised.

  Although the preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, the present invention is not limited to such examples. It is obvious that those skilled in the art to which the present invention belongs can conceive of various changes or modifications within the scope of the technical idea described in the claims. Of course, it is understood that these also fall within the technical scope of the present invention.

  For example, in the above-mentioned embodiment, although a plate member provided with a capacity part was a baffle plate, the present invention is not limited to this example. The power transmission device may be provided with a plate member which can be displaced along with the rotation of the rotating member separately from the baffle plate, and the plate member may be provided with a capacity portion. Also by the power transmission device, the volume portion is immersed in the lubricating oil when the rotating member does not rotate and the oil level rises, while the volume portion moves upward from the oil surface of the lubricating oil when the rotating member rotates and the oil surface It is possible to lower Therefore, it is possible to reduce the spin loss of the power transmission while securing the lubricity of the bearing member of the rotating member.

  Moreover, in the said embodiment, although the baffle plate provided with the capacity | capacitance part was comprised so that rotation was possible coaxially with the rotation member, this invention is not limited to this example. For example, a capacity portion may be provided on a plate member that can move up and down with the rotation of the rotation member 20. Also by the power transmission device, the volume portion is immersed in the lubricating oil when the rotating member does not rotate and the oil level rises, while the volume portion moves upward from the oil surface of the lubricating oil when the rotating member rotates and the oil surface It is possible to lower

DESCRIPTION OF SYMBOLS 10 power transmission device 11 case 13 stopper part 20 rotation member 23a, 23b bearing member 30 baffle plate 31a, 31b side surface part 32 circumferential surface part 34a, 34b capacity part 35a, 35b bearing member 37 overhang | projection part

Claims (8)

Cases where lubricating oil is stored;
A rotating member, the lower part of which is immersed in the lubricating oil and rotatably accommodated in the case;
A plate member disposed with a gap interposed between at least the lower axial end face of the rotating member;
A portion of the plate member is provided with a capacity portion whose plate thickness is larger than that of the other portion,
The plate member is displaceable with rotation of the rotating member,
The power transmission device is immersed in the lubricating oil when the rotating member is not rotating, and is positioned above the oil surface of the lubricating oil by the displacement of the plate member when the rotating member is rotating.   The power transmission device according to claim 1, wherein the plate member is rotatable along a rotation direction of the rotating member by a flow of the lubricating oil generated as the rotating member rotates.   The power transmission device according to claim 2, wherein the plate member is axially rotatable coaxially with the rotating member.   The power transmission device according to claim 2 or 3, wherein the capacity portion is provided on the tip side in the rotation direction of the plate member.   The power transmission device according to any one of claims 1 to 4, wherein the capacity portion is provided on a surface of the plate member opposite to a surface facing the rotating member.   The power transmission device according to any one of claims 1 to 5, wherein a specific gravity of the volume portion is larger than a specific gravity of the lubricating oil.   The power transmission device according to any one of claims 1 to 6, further comprising a stopper which defines a maximum displacement position of the plate member. The power transmission device according to any one of claims 1 to 7, wherein the plate member is a baffle plate.

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