JPH1026216A - Lubricating oil flow controller for vehicular power transmission system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify a structure for preventing insufficient volume of lubricating oil in inner room in a mission housing at its other part and for preventing excessive amount of the lubricating oil in inner room in a differential housing. SOLUTION: In a mission housing 16, inner room 17 at the other part except a part of a differential housing 35-installed portion is communicated to the inner room 36 of the differential housing 35 located lower than the inner room 17. Provided is a flow controlling board 50 upwardly, downwardly expanded to partition both the inner room 17, 36 and to control the flow of lubricating oil 47 from the inner room 17 of the mission housing 16 at the other part to the inner room 36 of the differential housing 35. A part of the upper edge part of the flow controlling board 50 is expanded to a ring gear 39 side in the axial direction of the ring gear 29. The expanded part 52 is located so that the expanded part 52 may be superimposed on at least part of its tooth part 45 in the diameter direction of the ring gear 39.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power transmission system for an automobile in which an internal space of a differential housing constituting a differential device is lower than an internal space of a transmission housing constituting a power transmission device. More specifically, the present invention relates to a lubricating oil flow restricting device that restricts lubricating oil from flowing from the internal space of the transmission housing to the internal space of the differential housing.

[0002]

2. Description of the Related Art A conventional power transmission system for an automobile is disclosed in Japanese Patent Publication No. 4-2444.

[0003] According to this, a power transmission device includes a transmission housing constituting an outer shell thereof, and a gear type transmission which is provided in the transmission housing to input power from an engine and to shift and output the power. Mechanism. On the other hand, a differential device for linking the left and right wheels with each other is provided, and the differential device forms an outer shell and is attached to a part of the transmission housing in a horizontal direction, and extends in the vehicle width direction. A ring gear that is supported by the differential housing so as to be rotatable about the axis and that receives power from the transmission mechanism;

The power of the engine is shifted by the speed change mechanism and transmitted to the differential. By the action of the differential, power having the same torque is transmitted to each of the left and right wheels, and the automobile runs. It is made to be made.

[0005] In the conventional technique, the internal space of the other part of the transmission housing is communicated with the internal space of the differential housing, which is located at a lower position.

[0006] For this reason, in this configuration, in the internal space of the other part except the above part of the transmission housing,
Lubricating oil for lubricating the transmission mechanism tends to flow into the internal space of the differential housing by natural flow, and therefore, in the internal space of the other part of the transmission housing,
While the lubricating oil for lubricating the transmission mechanism tends to be insufficient, the amount of the lubricating oil accumulated in the internal space of the differential housing tends to be excessive, and the resistance of the ring gear to stirring the lubricating oil tends to be excessive.

Therefore, a flow restricting plate is provided for restricting the flow of lubricating oil from the bottom of the internal space of the other portion of the transmission housing to the internal space of the differential housing. Lubricating oil inflow is regulated.

The gear pump includes a pair of gears meshing with each other in the transmission mechanism, and an oil absorption pipe connecting the bottom of the internal space of the differential housing to a side near the meshing portion of the two gears where the meshing is released. With this gear pump, lubricating oil accumulated at the bottom of the internal space of the differential housing is supplied to the internal space of the other part of the transmission housing.

That is, the flow restricting plate restricts the lubricating oil from flowing into the internal space of the differential housing from the bottom of the internal space of the other part of the transmission housing, and the internal space of the differential housing is controlled by the gear pump. The lubricating oil is constantly stored at the bottom of the internal space of the other part of the transmission housing by supplying the lubricating oil to the internal space of the other part of the transmission housing from above, so that the lubrication of the transmission mechanism can be properly performed. In addition, the amount of the lubricating oil stored in the internal space of the differential housing is made appropriate, so that an increase in the resistance of the ring gear to stirring of the lubricating oil is suppressed.

[0010]

According to the above prior art, a gear pump, especially an oil absorbing pipe, is separately provided in order to supply the lubricating oil in the internal space of the differential housing to a desired lubricated portion. Therefore, the number of components of the lubricating device is increased, and the configuration is complicated.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and the internal space of the differential housing is lower than the bottom of the internal space of the other part of the transmission housing. In a case where the lubricating oil in the internal space of the other part tends to flow naturally into the internal space of the differential housing, the amount of the lubricating oil in the internal space of the other part of the transmission housing is prevented from becoming insufficient. It is an object to prevent the amount of lubricating oil in the internal space of the differential housing from becoming excessive, and to simplify the configuration for achieving this object.

[0012]

According to the present invention, there is provided a lubricating oil flow control device for a power transmission system for an automobile, wherein the power transmission device 9 includes a transmission housing 16 forming an outer shell, The transmission housing 16 includes a gear-type transmission mechanism 26 that inputs power from the engine 6 and that changes the power and outputs the power. On the other hand, the differential device 11 that interlocks the left and right wheels 4 and 4 with each other is provided. And a differential housing 35 which forms an outer shell and is attached to a part of the transmission housing 16 in a horizontal direction, and a differential housing 35 which is rotatable around an axis extending in the vehicle width direction. Differential housing 3
And a ring gear 39 which is supported by the transmission 5 and receives the power from the transmission mechanism 26.
The internal space 17 of the other part communicates with the internal space 36 of the differential housing 35 which is located at a lower position, and extends in the vertical direction to partition the internal spaces 17 and 36, and the other part of the transmission housing 16 When a flow control plate 50 for controlling the flow of the lubricating oil 47 from the internal space 17 to the internal space 36 of the differential housing 35 is provided, one of the upper edges of the flow control plate 50 in the axial direction of the ring gear 39 is provided. The bulge portion is bulged toward the ring gear 39, and the bulge portion 52 is positioned so as to overlap with at least a part of the tooth portion 45 in the radial direction of the ring gear 39.

[0013]

Embodiments of the present invention will be described below with reference to the drawings.

In FIGS. 1 and 2, reference numeral 1 denotes an automobile, and an arrow Fr
Indicates the front of the vehicle 1 and the following left and right refer to the width direction of the vehicle 1.

The automobile 1 has a vehicle body 2 and a pair of left and right front and rear wheels 4, 4 for supporting the vehicle body 2 on a traveling road surface 3, respectively.

An engine room 5 is formed in a front portion of the vehicle body 2, and an engine 6 which is an internal combustion engine is provided in the engine room 5. The crankshaft 7 of the engine 6 extends in the vehicle width direction, that is, the engine 6 is of a horizontal type. A clutch 8 and a power transmission device 9 are connected to one side of the left and right sides of the engine 6, and are arranged side by side in the vehicle width direction. Further, there is provided a differential device 11 for interlocking the front left and right wheels 4, 4 with each other via a universal joint shaft 10.

In all of the drawings, the clutch 8 includes a clutch housing 13 attached to a crankcase 12 of the engine 6 and a clutch body 14 housed in the clutch housing 13.

The power transmission device 9 includes a transmission housing 16 that forms an outer shell and is attached to the clutch housing 13.
Input shaft 18 and output shaft 1 housed in internal space 17 of
9 is provided. The shaft centers 20, 21 of the input shaft 18 and the output shaft 19 extend in parallel with each other and extend in a substantially horizontal vehicle width direction. The transmission housing 16 is arranged so that the input shaft 18 is rotatable about its axis 20.
And one end of the input shaft 18 on the engine 6 side is interlocked to the crankshaft 7 of the engine 6 via the clutch body 14. The output shaft 19 is supported by a bearing 24 on the transmission housing 16 so as to be rotatable around its axis 21.

The gear type transmission mechanism 26 for interlocking the input shaft 18 and the output shaft 19 with each other is provided in the internal space 1.
7. The transmission mechanism 26 includes the output shaft 1
9 has an output gear 27 which is a spur gear integrally attached to one end of the engine 6 side. Further, a shift operation means 29 for enabling the speed change mechanism 26 to perform a shift operation by a driver's operation is provided. The shift operation means 29 is provided with an engaging member 30 for enabling and disengaging the gears in the transmission mechanism 26 or for enabling and disengaging the gear and the input shaft 18 or the output shaft 19. A shift fork 32 is provided which engages to transmit the operating force applied to the shift operation section 31 to the engagement element 30 and thereby performs the engagement / disengagement operation.

The differential device 11 has a differential housing 35 forming an outer shell. The differential housing 35 is attached to a lower portion of an end (corresponding to a part of the transmission housing 16 in the horizontal direction) of the transmission housing 16 on the engine 6 side in a direction along the shaft centers 20, 21. A part of the transmission housing 16 and each internal space 1 of the differential housing 35
7, 36 are communicated with each other. A differential case 37 is accommodated in an internal space 36 of the differential housing 35,
The differential case 37 is supported by the differential housing 35 so as to be rotatable about an axis 38 extending in the vehicle width direction parallel to the axes 20 and 21. A ring gear 39, which is a spur gear, is provided on the differential case 37 on the shaft center 38.
The ring gear 39 is attached to the output gear 2.
7, the power is transmitted from the output gear 27,
Thus, it rotates together with the differential case 37.

A differential pinion 40 is provided on the differential case 37 so as to be rotatable about an axis perpendicular to the axis 38. Also, this differential pinion 4
A pair of left and right differential side gears 41, 41 supported by the differential case 37 are provided so as to be rotatable about the shaft center 38 by meshing with the differential side gears 41.
The wheels 4 are linked to each other via the universal joint shaft 10.

The power of the engine 6 is transmitted from the crankshaft 7 to the input shaft 18 of the power transmission device 9 via the clutch 8, from which the speed is changed by the transmission mechanism 26 and transmitted to the output shaft 19. The power is transmitted from the output shaft 19 to the ring gear 39 of the differential device 11, and the power of the same torque is transmitted to the left and right wheels 4, 4 via the universal joint shaft 10 by the operation of the differential device 11. ,
Thereby, the automobile 1 can travel on the traveling road surface 3.

Each of the bearings 23, 24, the transmission mechanism 26, and the respective teeth 44, 45 of the output gear 27 and the ring gear 39.
A lubricating device 48 is provided that lubricates the lubricated portion side with a lubricating oil 47, such as a meshing portion 46 between them. Next, the lubricating device 48 will be described.

A lubricating oil 47 is provided at the bottom of the internal space 17 on the end side of the transmission housing 16 opposite to the engine 6 (corresponding to another part except the above-mentioned part of the transmission housing 16 in the horizontal direction). It is stored. The lubricating oil 47 is scraped up by the gears of the transmission mechanism 26, and the parts of the transmission mechanism 26 are lubricated.

A lubricating oil 47 is stored at the bottom of the internal space 36 of the differential housing 35. This lubricating oil 47
Is lifted up by the ring gear 39, and the meshing portion 46 between the ring gear 39 and the output gear 27 is lubricated.

In the above case, the transmission housing 1
The inner space 36 of the differential housing 35 is located at a lower position than the bottom of the other inner space 17 of the sixth part 6, and the two inner spaces 17, 36 are communicated with each other.

For this reason, with this configuration, the lubricating oil 4 at the bottom of the internal space 17 of the transmission housing 16 is not used.
7 tends to flow into the internal space 36 of the differential housing 35 by natural flow. Therefore, a flow control plate 50 made of sheet metal is provided to control the flow of the lubricating oil 47 from the bottom of the internal space 17 of the transmission housing 16 to the internal space 36 of the differential housing 35. Therefore, in each drawing, the flow control plate 50 is shown in a satin pattern.) The flow regulating plate 50 extends in the up-down direction, and the internal space 1 in the other portion of the transmission housing 16 is formed.
7 and an internal space 36 of the differential housing 35. The flow control plate 50 is detachably fastened to a side wall of the transmission housing 16 by a fastener 51.

The flow regulating plate 50 is located near each side surface of the output gear 27 and the ring gear 39 meshed with each other. In the axial direction of each of the axes 20, 21, and 38,
A part of the upper edge of the flow control plate 50 is
And the ring gear 39 are swelled by bending by press working. In particular, as shown in the side view of FIG.
In the radial direction of the ring gear 39, the bulging portion 52 is positioned so as to overlap with at least a part of the tooth portion 45 of the ring gear 39, and the bulging portion 52
Are positioned so as to overlap with at least a part of the tooth portion 44 of the output gear 27.

3 to 9, inside the output shaft 19, a first oil passage 55 is formed on the shaft center 21. The first oil passage 55 is not shown, but each lubrication target of the transmission mechanism 26 is provided. Part communicates through an oil hole. One end of an oil introduction pipe 56 (shown in a satin pattern in each drawing for easy understanding) is fitted into an end of the first oil passage 55 on the engine 6 side. Is connected to the internal space 17 of the mission housing 16 by a second oil passage 57 formed in the mission housing 16. In this case, an end opening of the second oil passage 57 on the side of the internal space 17 is located near an upper portion of the bulging portion 52.

Of the outer peripheral surfaces of the tooth portions 44 and 45 of the output gear 27 and the ring gear 39, the transmission housing 1
6 and / or a part of the inner surface of the differential housing 35 is approached.

More specifically, on the outer peripheral surface of the tooth portion 44 of the output gear 27, in front of the meshing portion 46, that is, in the rotation direction of the output gear 27 (arrow A in FIGS. 5 to 7), A part of the inner surface of the transmission housing 16 is made to approach the outer peripheral surface behind the engagement portion 46,
A part of this inner surface is an arcuate concave first guide surface 59. The outer peripheral surface of the output gear 27 and the first guide surface 59
Although not shown in detail, the gap between them is, for example, several mm or less.

Further, in the outer peripheral surface of the tooth portion 45 of the ring gear 39, in front of the meshing portion 46, that is, in the rotation direction of the ring gear 39 (arrow B in FIGS. A part of the inner surface of the differential housing 35 is made to approach the rear outer peripheral surface, and a part of the inner surface is an arc-shaped concave second guide surface 60. The gap between the outer peripheral surface of the ring gear 39 and the second guide surface 60 is not shown in detail, but is, for example, several mm or less.

One end is opened toward the engagement portion 46,
A third oil passage 62 is provided, the other end of which is open toward the upper portion of the bulging portion 52 and the end opening of the second oil passage 57 on the side of the internal space 17. The three oil passages 62 are formed in the transmission housing 16. In this case, as seen from a line of sight along the axis of the output gear 27 (FIG. 5).
7), the third oil passage 62 is provided on the opposite side of the output gear 27 with respect to the first guide surface 59, and the third oil passage 62 is formed in a groove in the first guide surface 59. It is avoided that it is formed in a shape. In addition, the third oil passage 6
Numeral 2 extends in an arc around the axis 21 substantially along the first guide surface 59.

When the output gear 27 and the ring gear 39 mesh with each other during transmission of power from the power transmission device 9 to the differential device 11 (arrows A and B in FIGS. 5 to 7),
The lubricating oil 4 held between the teeth 44 of the output gear 27
It is suppressed by the first guide surface 59 formed on the transmission housing 16 that the 7 is going to flow out between the tooth portions 44. On the other hand, the lubricating oil 47 that has accumulated at the bottom of the internal space 36 of the differential housing 35 is scraped up while being held between the teeth 45 of the ring gear 39 one after another.
An attempt to flow out from between the teeth 45 is suppressed by the second guide surface 60 formed on the differential housing 35.

The lubricating oil 47 held between the teeth 44, 45 is engaged with the mesh 46 of the gears 27, 39.
Thus, the lubricating oil 47 is forcibly pushed out from between the respective tooth portions 44 and 45 in the tangential direction of the two gears 27 and 39, and the lubricating oil 47 pressurized by this pushing passes through the third oil passage 62 and will be described later. It is supplied to the lubricated part side.

That is, the output gear 27 and the ring gear 3
9, the first guide surface 59 of the transmission housing 16, the second guide surface 60 of the differential housing 35, and the third oil passage 62
Forms a kind of "gear pump".
The output gear 27 and the ring gear 39 correspond to a rotor, the first and second guide surfaces 59 and 60 correspond to a pump case, and the third oil passage 62 corresponds to a discharge port.

A part of the lubricating oil 47 which has flowed out of the meshing portion 46 of the above-mentioned "gear pump" passes through the third oil passage 62 by its pressure and inertia, and the third oil passage 62 When the lubricating oil 47 is discharged from the opening at the other end, it passes over the upper edge of the bulging portion 52 and into the inside thereof due to the inertial force at the time of discharging.
It is guided by the bulging portion 52 of the flow regulating plate 50 and is supplied to the internal space 17 of the other portion of the transmission housing 16 having the transmission mechanism 26 on the lubricated portion side (see FIGS.
8, (C) additional notes).

In the above case, as described above, each axis 2
In the axial direction of 0, 21, 38, the tooth portion 45 and the bulging portion 52 of the ring gear 39 are located at the same position, and in the radial direction of the ring gear 39, the tooth portion 45 and the bulging portion 52 Since the lubricating oil 47 pushed out in the tangential direction of the ring gear 39 does not need to be fed in the axial direction, the inertia force (centrifugal force) causes the lubricating oil 47 to expand. The lubricating oil 47 is sent linearly toward the inside of the protruding portion 52, so that the lubricating oil 47 flows more smoothly into the inside of the protruding portion 52.

Here, the lubricating oil 47 in the internal space 17 at the other part of the transmission housing 16 flows into the internal space 36 of the differential housing 35 at a lower position than the internal space 17 and The lubricating oil 47 in the internal space 17 tends to be insufficient, while the lubricating oil 47 in the internal space 36 of the differential housing 35 tends to be excessive.
And the supply of the lubricating oil 47 from the internal space 36 of the differential housing 35 to the internal space 17 of the transmission housing 16 by the "gear pump".

As a result, the transmission housing 16
The transmission mechanism 26 is appropriately lubricated by the lubricating oil 47 in the other internal space 17. The differential housing 3
5 is supplied to the internal space 17 of the transmission housing 16, so that an excessive amount of the lubricating oil 47 is prevented in the internal space 36 of the differential housing 35, and the ring gear 39 is prevented. This prevents the agitation resistance of the lubricating oil 47 from becoming excessive.

Further, as described above, the third gear is pushed out from the meshing portion 46 of the "gear pump" and
The lubricating oil 47 discharged through the oil passage 62 has its momentum,
The oil is fed into the second oil passage 57, and is then supplied to the bearing 24 and the speed change mechanism 26, which are lubricated parts, sequentially through the oil introduction pipe 56 and the first oil passage 55 (see FIGS. 4 and 7).
(D) Note) The lubricating oil 47 allows the bearing 24
And the transmission mechanism 26 is lubricated.

Although the above description is based on the illustrated example, both the first and second guide surfaces 59 and 60 may be formed on the inner surface of the transmission housing 16, or may be formed on the inner surface of the differential housing 35. May be.

[0043]

According to the present invention, a power transmission device includes a transmission housing constituting an outer shell thereof, and a gear type which is provided in the transmission housing to input power from an engine and to shift and output the power. A differential housing for providing a transmission mechanism, and a differential device for interlocking the left and right wheels with each other, and the differential device forms an outer shell and is attached to a part of the transmission housing in a horizontal direction, A ring gear that is supported by the differential housing so as to be rotatable around an axis extending in the vehicle width direction and that inputs power from the transmission mechanism; and that the internal space of the other part of the transmission housing is lower than this. Communicating with the internal space of the differential housing,
Lubricating oil for a power transmission system for an automobile provided with a flow regulating plate that extends in the vertical direction and partitions the two internal spaces and that controls the flow of lubricating oil from the internal space of the other part of the transmission housing to the internal space of the differential housing. In the flow restricting device, a part of an upper edge portion of the flow restricting plate is bulged toward the ring gear in the axial direction of the ring gear, and the bulged portion is formed at least partially in a radial direction of the ring gear. It is positioned so as to overlap with each other, and has the following effects.

That is, when power is transmitted from the power transmission device to the differential device, the lubricating oil collected at the bottom of the internal space of the other part of the differential housing is scraped up while being held between the teeth of the ring gear. As the lubricating oil reaches the upper side, the lubricating oil flows out from between the tooth portions outwardly in the tangential direction and radial direction due to the centrifugal force and the like.

At this time, as described above, since the bulging portion is located so as to overlap with at least a part of the tooth portion of the ring gear, the tangential direction from between the respective tooth portions on the upper portion of the ring gear. Feeding the lubricating oil that flows out in a radially outward direction into the bulging portion eliminates the need to feed the ring gear in the axial direction, uses the centrifugal force of the lubricating oil, and allows By utilizing the flow-down, lubricating oil in the internal space of the differential housing can be more reliably fed into the bulging portion by the ring gear, and guided by the bulging portion, It is supplied to the internal space of the other part of the transmission housing.

As a result, the transmission mechanism is properly lubricated by the lubricating oil in the internal space of the other part of the transmission housing. Further, since the lubricating oil in the internal space of the differential housing is supplied to the internal space of the transmission housing, it is prevented that the lubricating oil in the internal space of the differential housing becomes excessive, and the lubricating oil by the ring gear is prevented. This prevents the stirring resistance from becoming excessive.

As described above, the structure for supplying the lubricating oil in the internal space of the differential housing to the internal space of the other part of the transmission housing is achieved by simply pressing the swelled portion on the existing flow regulating plate by pressing or the like. Therefore, the amount of the lubricating oil in the internal space of the differential housing is prevented from becoming excessive while the amount of the lubricating oil in the internal space of the other portion of the transmission housing is not insufficient. Is simplified.

[Brief description of the drawings]

FIG. 1 is a front view of an automobile.

FIG. 2 is a side view of the front part of the vehicle.

FIG. 3 is a partially enlarged sectional view of FIG. 1;

FIG. 4 is a partially enlarged sectional view of FIG. 3;

FIG. 5 is a partially enlarged sectional view of FIG. 2;

FIG. 6 is a view in which a part of the flow regulating plate is cut away in FIG.

FIG. 7 is a partially enlarged sectional view of FIG. 6;

FIG. 8 is a sectional view taken along line 8-8 of FIG. 7;

FIG. 9 is a perspective developed view.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Automobile 4 Wheel 6 Engine 9 Power transmission device 11 Differential device 16 Transmission housing 17 Internal space 18 Input shaft 19 Output shaft 20 Axis 21 Axis 26 Transmission mechanism 27 Output gear 35 Differential housing 36 Internal space 38 Axis 39 Ring gear 44 Tooth portion 45 Tooth portion 46 Mesh portion 47 Lubricating oil 48 Lubricating device 50 Flow control plate 52 Swelling portion 59 First guide surface 60 Second guide surface 62 Third oil path (oil path)

Claims (1)

[Claims] A power transmission device includes a transmission housing constituting an outer shell thereof, and a gear type transmission mechanism which is provided in the transmission housing and which receives power from an engine and changes and outputs the power. On the other hand, a differential device for interlocking the left and right wheels with each other is provided, and the differential device constitutes an outer shell and is attached to a part of the transmission housing in a horizontal direction, and a differential housing in a vehicle width direction. A ring gear that is supported by the differential housing so as to be rotatable about an extended axis and that inputs power from the transmission mechanism, and wherein the internal space of the other part of the transmission housing is lower than this. It communicates with the internal space of the housing, extends in the up-down direction, partitions the two internal spaces from the internal space of the other part of the mission housing. In a lubricating oil flow restricting device for a power transmission system for an automobile provided with a flow restricting plate for restricting a flow of lubricating oil to an internal space of the differential housing, the lubricating oil flow restricting plate may include an upper edge portion of the flow restricting plate in an axial direction of the ring gear. A lubricating oil flow control device for a power transmission system for an automobile, wherein a portion is bulged toward the ring gear, and the bulged portion is positioned so as to overlap with at least a part of a tooth portion in a radial direction of the ring gear.