JP2585898Y2 - Lubrication structure of automotive transfer - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lubricating structure for lubricating a chain winding mechanism in an automobile transfer.

[0002]

2. Description of the Related Art A conventional lubrication structure for an automobile transfer is disclosed in Japanese Utility Model Laid-Open Publication No. 1-118252.

According to this, a chain winding mechanism is provided in a transfer case. This chain winding mechanism is composed of a drive wheel that receives power from the engine side, a driven wheel that transmits power to the wheel side, and a chain that is wound around these two wheels. It is arranged.

Further, a lower portion in the transfer case is an oil reservoir, and when the chain winding mechanism is driven, the chain lifts up oil from the oil reservoir,
This oil lubricates the chain winding mechanism and other parts.

[0005]

By the way, in the above-mentioned conventional configuration, the initial state when the chain wrapping mechanism is stationary.
The height of the oil level in the oil sump in the initial state
If it is too low, the chain winding mechanism will
When driving starts, the amount of oil scraped up by the chain
Because of the small number, the chain winding mechanism
Time until oil reaches each part of the
Start time)), during which time lubrication is inadequate
May cause minutes.

Therefore, conventionally, in the above initial state,
Addressing the above problem by setting the oil level above a certain level
However, at this time, the amount of oil accumulated in the oil sump was large.
To start, the chain starts scooping up the oil
However, the oil level is only slightly lower,
As described above, raising the oil level in the initial state
Oil stirring resistance by the above chain during driving is large
Therefore, there is a problem that the mechanical loss in the transfer becomes excessive.

[0007]

[Devised object of this invention is made by focusing on the above situation, the chain wrapping mechanism provided in the transfer case, In no event the bottom of the same transfer case to an oil reservoir, When the chain is stationary
In the initial state, the oil level in the oil sump
High to prevent insufficient lubrication at the start of driving
Even when allowed to, as agitation resistance of oil due to the chain of the chain wrapping mechanism being driven is reduced, and an object thereof is mechanical loss is prevented from becoming excessive in the transfer.

[0008]

In order to achieve the above object, the present invention is characterized in that the transfer case 2 includes a case body 14 and first and second chambers inside the case body 14 in the front-rear direction. The first chamber 17 includes a drive chain wheel 33 and a driven wheel chain 34 disposed vertically, and a chain 35 wound around these wheel chains 33, 34. And the second room 2
2 is provided with a transmission 10 for transmitting power from an engine to the drive chain wheel 33, and a lubrication structure for an automobile transfer in which a lower part of the first chamber 17 is an oil reservoir 36.

(1) The width of the lower part of the first chamber 17 in the front-rear direction is made smaller than that of the upper part of the first chamber 17,

(2) The upper part of the first chamber 17 is placed in the second chamber 22
And a guide portion 42 for guiding the oil scooped up by the chain 35 to the oil delivery hole 41, and the second chamber 22 is provided with an oil delivery hole 41 communicating with the second chamber 22. An oil return hole 43 is formed in the partition wall 16 to communicate with the lower portion of the first chamber 17, and the guide portion 42 is connected to the drive sheave 33, the driven sheave 34, and the drive sheave 33 and the driven sheave 34. In that it is arranged in a space surrounded by a chain 35 wound around.

[0011]

[Operation] The operation of the above configuration is as follows.

First chamber 17 in transfer case 2
The lower part of the first chamber 17 is an oil reservoir 36, and the width of the lower part of the first chamber 17 is smaller than that of the upper part of the first chamber 17.

Therefore, the “lubrication start time” is shortened.
To the initial state when the chain 35 is stationary.
In this state, the liquid level of the oil 37 in the oil sump 36 is raised
As described above, the width of the lower portion of the first chamber 17 is reduced , that is, the capacity of the oil reservoir 36 is reduced.
If it is reduced, by starting the driving of the chain 35
When the oil 37 is scraped up, the level of the oil 37 rises.
Oil 37 by the chain 35
The stirring resistance becomes small.

The upper part of the first chamber 17 is connected to the second chamber 22.
And a guide portion 4 for guiding the oil 37 scooped up by the chain 35 to the oil delivery hole 41.
2 and an oil return hole 43 for communicating the second chamber 22 with a lower portion of the first chamber 17 is formed in the partition wall 16.

For this reason, the chain 35 is
The oil 37 raked up by the oil feed hole 41 is guided by the guide portion 42 to the oil feed hole 41 and the oil feed hole 4
1 to the second chamber 22 where the transmission 10 is lubricated. Then, as described above, the oil 37 scooped up by the chain 35 is more reliably diverted to the first chamber 17 after passing through the second chamber 22 once by the guide function of the guide portion 42 described above. and than, Therefore, minutes to the bypass, is small amount of oil 37 in the oil reservoir 36 in the first chamber 17, marks in FIG. 2
As shown by reference numeral 37a, the liquid level of the oil 37 is further lowered,
Further small Kunar stirring resistance of the oil 37 by the chain 35.

In the above case, the guide portion 42 is connected to the drive sheave 33, the driven sheave 34, and the drive sheave 3
It is disposed in a space surrounded by a chain 35 wound around the driven wheel 3 and the driven wheel 34.

For this reason, the above-mentioned space, which is an extra space in the transfer case 2, is used for disposing the guide portion 42. Therefore, as described above, the oil 37 scooped up by the chain 35 is further removed. Even if the guide portion 42 for reliably bypassing is provided, the transfer case 2 is prevented from becoming large.

[0018]

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

In FIGS. 1 and 2, reference numeral 1 denotes a vehicle transfer, and an arrow Fr in FIG. 1 indicates the front of the vehicle. The left and right described below refer to the direction toward the front.

Reference numeral 2 denotes a transfer case of the transfer 1, and a front portion of the transfer case 2 supports a drive shaft 3, and the drive shaft 3 is rotated by inputting power from an engine.

Behind the drive shaft 3, a rear wheel output shaft 5 is coaxially supported by a rear portion of the transfer case 2. The rear end of the rear wheel output shaft 5 is connected by a universal joint shaft 4. It is connected to the rear wheel side. A front wheel output shaft 6 is disposed below the drive shaft 3. The front wheel output shaft 6 is supported by a lower end of the transfer case 2. A front end of the front wheel output shaft 6 is a universal joint shaft 8. To the front wheel side.

A gear type transmission 10 is interposed between the drive shaft 3 and the rear wheel output shaft 5. A drive switching device 11 for driving two or four wheels is provided on the output shaft 5 for rear wheels.
The drive switching device 11 is provided with a chain winding mechanism 12 for interlocking the front wheel output shaft 6.

The transfer case 2 has a case body 14 constituting a front portion thereof, and a partition wall 16 for dividing the inside of the case body 14 into first and second chambers 17 and 22 in the front-rear direction.
And The case body 14 has an outer peripheral wall 15, and the partition wall 1 is provided at an intermediate portion of the outer peripheral wall 15 in the front-rear direction.
6 are provided. An opening 18 is formed at the rear end of the outer peripheral wall 15 to open the first chamber 17 in the rear part of the outer peripheral wall 15 rearward and outward. The case body 14 has a case cover 20 that closes the opening 18 so that it can be opened and closed.
The case cover 20 is detachably screwed to the rear end of the outer peripheral wall 15 by bolts 21.

The second chamber 22 in the front part of the case body 14
The transmission 10 is housed therein. This transmission 1
0 has a transmission shaft 23 located below the drive shaft 3, and a first drive gear 25 fixed to the drive shaft 3 and a first reduction gear 26 fixed to the transmission shaft 23 are mutually separated. Are engaged. Further, a second drive gear 27 rotatably supported on the rear wheel output shaft 5 and a second reduction gear 28 fixed to the transmission shaft 23 are meshed with each other.

Reference numeral 30 denotes a speed changeover device. The speed changeover device 30 has an engaging element 31 which is spline-fitted to the rear wheel output shaft 5 so as to be slidable in the axial direction. The engaging element 31 can be selectively engaged with either the first drive gear 25 or the second drive gear 27.

When the engaging element 31 is in the state shown in FIG. 1, the first drive gear 25 rotating together with the drive shaft 3 includes the first reduction gear 26, the speed change shaft 23, the second reduction gear 28, and the second drive gear 27. However, these idle and rotate, and a neutral state is achieved in which the power of the engine is not transmitted to either the rear wheel output shaft 5 or the front wheel output shaft 6.

When the engaging element 31 is moved forward to engage with the first drive gear 25, the output shaft 5 for the rear wheel is directly connected to the first driving gear 25 via the engaging element 31. The shaft 5 rotates at high speed.

On the other hand, the engaging element 31 is moved
When the first drive gear 25 is engaged with the drive gear 27,
The rear wheel output shaft 5 is connected via the reduction gear 26, the transmission shaft 23, the second reduction gear 28, and the second drive gear 27, and the rear wheel output shaft 5 rotates at low speed.

The chain winding mechanism 12 is connected to the first chamber 1
7, a drive chain wheel 33 that is freely rotatably supported on the rear wheel output shaft 5, a driven wheel wheel 34 that is fixed to the front wheel output shaft 6,
The drive sheave 33 is composed of a drive sheave 33 and a chain 35 wound around a driven sheave 34. In this case, the rear part of the case main body 14 extends in the downwardly inclined direction, the rear wheel output shaft 5 is disposed with the drive chain wheel 33 on the upper right side, and the front wheel output shaft 6 is driven on the lower left part. It is arranged together with the chain wheel 34.

The lower part of the first chamber 17 is provided with an oil reservoir 3.
The oil 37 is stored here. That is,
The lower side of the flat horizontal liquid surface of the oil 37 shown in FIGS.

Further, the drive switching device 11 is provided in the first
The chamber 17 has an engaging member 39 which is spline-fitted to the rear wheel output shaft 5 side so as to be slidable in the axial direction. It is removable.

When the engaging member 39 is in the state shown in FIG. 1, the engaging member 39 is separated from the drive chain wheel 33, and the power of the engine is not transmitted to the front wheel output shaft 6 side. When power is transmitted from 3 to the rear wheel output shaft 5,
It becomes a two-wheel drive state with only the rear wheels.

On the other hand, by moving the engaging member 39 backward,
When engaged with the drive wheel 33, the front wheel output shaft 6 is connected to the rear wheel output shaft 5 via the drive wheel 33, a chain 35, and a driven wheel 33, that is, from the drive shaft 3 to the rear wheel. When the power is transmitted to the output shaft 5, the front and rear four-wheel drive state is established.

2 and 3, the chain winding mechanism 12 rotates in the direction of arrow A in the four-wheel drive state. Therefore, the lower part of the chain 35 is
And moves to the upper right to the drive chain wheel 33, and the upper part of the same chain 35 becomes the loose side 35b,
Move to the lower left toward 4.

Then, the driven wheel 34 and the chain 3
5 pulls up the oil 37 from the oil reservoir 36 to the upper right, and the oil 37 is used for lubrication of the chain winding mechanism 12 and other components. Further, in this case, the oil level of the oil 37 changes to the position indicated by the reference numeral 37a in FIGS.

In FIGS. 1, 3 to 5, and 7, the width of the lower part 20b in the front-rear direction inside the case cover 20 is smaller than that of the upper part 20a. Also, this time, the lower portion of the width of the first chamber 17 in the longitudinal direction is smaller than that of the upper portion of the first chamber 17, that is, the capacity of the oil reservoir 36 is small <br/> rot You. Therefore, the chain winding mechanism 12 is driven.
And the oil 37 is scratched by the start of the drive of the chain 35.
When the oil 37 is lifted, the level of the oil 37 becomes lower.
And the subsequent stirring resistance of the oil 37 by the chain 35
Becomes smaller.

In the above case, since the width of the lower portion 20b of the case cover 20 is reduced, the rigidity of the case body 14 tends to decrease, but the width of the case cover 20 is generally reduced. Since the upper portion 20a is not wide but is widened, the case cover 20 has a predetermined rigidity.

In all of the figures, an oil delivery hole 41 for communicating the upper part of the first chamber 17 with the second chamber 22 is provided in the partition wall 1.
6 is formed at the upper part. Further, a guide portion 42 for guiding the oil 37 scooped up by the chain 35 in the first chamber 17 to the oil delivery hole 41 is provided, and the second chamber 22 communicates with a lower portion of the first chamber 17. Oil return hole 4
3 is formed on the partition wall 16. Guide section 42
Are disposed in a space surrounded by the drive wheel 33, the driven wheel 34, and a chain 35 wound around the drive wheel 33 and the driven wheel 34, and at least the guide portion 42 A part is disposed in the oil sump 36.

The guide portion 42 has a first reinforcing rib 44 projecting from the partition wall 16 between the tension side 35a and the loosening side 35b of the chain 35, and a second reinforcing rib projecting from the inner surface of the case cover 20. The first rib 44 and the second rib 45 are both box-shaped, and their protruding ends are joined to each other. The first rib 44 and the second rib 4
A notch 46 is formed in each upper surface plate of No. 5, and the notch 46 is connected to the oil delivery hole 41.

The oil 37, which has been scraped up by the chain 35 and dropped from the loose side 35b,
The ribs 44 and the second rib 45 guide the cutout 46 through the upper plate, and are fed into the first rib 44 and the second rib 45 to be guided to the oil delivery hole 41 and pass through the oil delivery hole 41. To the second chamber 22.

The guide portion 42 has a third reinforcing rib 47 projecting from the partition wall 16 to the left of the oil delivery hole 41 and the first rib 44. Then, the oil 37 that is going to return to the oil reservoir 36 through the upper surface of the first rib 44 is stopped by the third rib 47, guided to the oil delivery hole 41 side, and passed through the oil delivery hole 41. To the second chamber 22. The oil 37 is supplied to the second chamber 2
2. The transmission 10 and the like are lubricated.

A notch 48 is formed in the third rib 47.
The notch 48 is used to return the oil 37 to return to the oil reservoir 36 through the upper surface of the first rib 44.
Is allowed to some extent. The amount of the oil 37 to be guided to the oil delivery hole 41 side is adjusted by the notch 48.

In FIG. 2, FIG. 5, and FIG. 6, a fourth reinforcing rib 49 is projected from the bottom surface of the first chamber 17 closer to the oil reservoir 36 than the oil return hole 43. This fourth rib 49
Prevents the oil 37 scooped up by the chain 35 from the oil reservoir 36 from flowing back through the oil return hole 43 to the second chamber 22 side.

In FIGS. 1, 2 and 6, an annular projection 50 is formed around the front wheel output shaft 6 on the surface of the case body 14 on the first chamber 17 side. A notch 51 is formed. Then, the oil 37 that has passed through the notch 48 to the left passes through the notch 51 to lubricate the bearing 52 for supporting the front wheel output shaft 6.

[0045]

According to the invention, the transfer case has a case body and a partition wall for dividing the interior of the case body into first and second chambers in the front-rear direction. A drive sheave and a driven sheave to be provided, and a chain wound around the two wheel sheaves are provided, and a transmission for transmitting power from an engine to the drive sheave is provided in the second chamber. And a lubrication structure for an automotive transfer in which the lower part of the first chamber is an oil reservoir,

(1) The width of the lower part of the first chamber in the front-rear direction is smaller than that of the upper part of the first chamber.

Therefore, the “lubrication start time” is shortened.
Initial state when the chain is stationary
When the oil level in the oil reservoir is raised to some
In this case, as described above, the width of the lower portion of the first chamber is reduced , that is, the capacity of the oil reservoir is reduced.
If the chain starts to drive, oil will be scooped up
And the level of the oil becomes lower,
Oil stirring resistance by the chain is reduced.

Therefore, in the transfer, the mechanical loss is prevented from becoming excessive.

(2) An oil delivery hole is formed in the upper part of the partition wall for connecting the upper part of the first chamber to the second chamber, and the oil scooped up by the chain in the first chamber is removed by the oil. A guide portion for guiding the delivery hole is provided, and an oil return hole for communicating the second chamber with a lower portion of the first chamber is formed in the partition wall.

For this reason, the oil scooped up by the chain from the oil reservoir is sent into the second chamber, where it lubricates the transmission. Then, as described above, the oil scooped up by the chain is more reliably diverted to the first chamber after passing through the second chamber once by the guide function of the above-described guide portion. , minutes of the bypass, is less the amount of oil in the oil reservoir in the first chamber, the liquid surface of the oil is even lower, stirring resistance is further small Kunar oil by the chain.

Therefore, also in this regard, occurrence of useless mechanical loss in the transfer is prevented.

In the above case, the guide portion is disposed in a space surrounded by the drive sheave, the driven sheave, and a chain wound around the drive sheave and the driven sheave.

For this reason, the above-mentioned space, which is an extra space in the transfer case, is used for disposing the guide portion. Therefore, as described above, the oil scooped up by the chain is more reliably bypassed. Even if the above-mentioned guide portion is provided, the transfer case is prevented from becoming large.

[Brief description of the drawings]

FIG. 1 is a sectional view taken along line 1-1 of FIG. 2;

FIG. 2 is a rear view of a case main body of the transfer case.

FIG. 3 is a view taken in the direction of arrows 3-3 in FIG. 1;

FIG. 4 is a sectional view taken along line 4-4 in FIG. 2;

FIG. 5 is a sectional view taken along line 5-5 of FIG. 2;

FIG. 6 is a perspective view of a case main body.

FIG. 7 is a perspective view of a case cover.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Transfer 2 Transfer case 10 Transmission device 11 Drive switching device 12 Chain winding mechanism 14 Case main body 16 Partition wall 17 1st chamber 18 Opening 20 Case cover 20a Upper part 20b Lower part 22 2nd room 33 Drive sheave 34 Driven sheave 35 Chain 36 Oil reservoir 37 Oil 41 Oil delivery hole 42 Guide 43 Oil return hole

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-57-97958 (JP, A) JP-A-61-2972 (JP, A) JP-A-62-258262 (JP, A) 5230 (JP, U) Full opening 1986-35264 (JP, U) Full opening 1986-186714 (JP, U) Full opening 63-6269 (JP, U) Real opening 64-12966 (JP, U) J. 46-21313 (JP, Y1) (58) Field surveyed (Int. Cl. ⁶ , DB name) F16H 57/04 B60K 17/344

Claims (1)

(57) [Scope of request for utility model registration] The transfer case has a case body, and a partition wall for partitioning the inside of the case body into first and second chambers in a front-rear direction, and a drive chain disposed vertically in the first chamber. A vehicle, a driven chain wheel, and a chain wound around the two chain wheels; a transmission for transmitting power from an engine to the drive chain wheel in the second chamber;
In a lubrication structure for an automobile transfer in which a lower part of a chamber is an oil reservoir, (1) a width dimension of a lower part of the lower part of the first chamber in a front-rear direction is smaller than that of an upper part of the first chamber; An oil delivery hole that connects the upper part of the first chamber to the second chamber is formed at the upper part of the partition wall, and a guide portion that guides the oil scraped up by the chain to the oil delivery hole is provided, and An oil return hole for communicating the second chamber with a lower portion of the first chamber is formed in the partition wall, and the guide portion is wound around the drive wheel, the driven wheel, and the drive wheel and the driven wheel. Lubrication structure for an automobile transfer provided in a space surrounded by a chain.