KR20220046325A - The ventilation chamber of the power take-off unit - Google Patents

Abstract

Disclosed is a ventilation chamber of a power withdrawal unit. According to one embodiment of the present invention, the ventilation chamber prevents oil from being leaked to the outside by using a plurality of partitions and a baffle plate provided inside the power withdrawal unit.

Description

The ventilation chamber of the power take-off unit

The present invention relates to a power take-off unit provided in a vehicle, and more particularly, to a ventilation chamber for preventing leakage of a power take-off unit.

In general, a 4 wheel drive vehicle is a vehicle with a function that can use both front and rear wheels as driving wheels for full or part time, unlike a 2 wheel drive vehicle. This includes specially equipped vehicles used for special purposes.

A four-wheel drive vehicle exhibits stable driving performance in drivable road conditions, and even when the road surface is weak due to terrain or climate, the power is evenly distributed to the four wheels, resulting in smooth driving by enhancing the gripping properties of the tires.

The constant velocity joint connecting the shaft to the drive unit is a common component in automobiles. The drive unit is typically provided with an input shaft or an output shaft for receiving a joint. The drive unit is an axle box, transfer case, transmission, power take-off unit or other torque device, all of which are components common to automobiles.

One or two joints are assembled to the shaft to form a thruster shaft assembly or drive shaft assembly. For example, the thruster shaft assembly may have one end connected to the output shaft of the transmission and the other end connected to the input shaft of a differential. In particular, when there is a longer gap between the vehicle's rear axle and the front drive unit, a two-piece thruster shaft assembly connected by an intermediate joint is generally used.

The shaft may be solid or tubular to attach the shaft to the inner race of the joint, and the outer race of the constant velocity joint may be connected to the drive unit.

The inner races of a joint are usually joined together to be press-fitted, splined, or pinned into the shaft, and the outer race of the joint is bolted to the flange or stub shaft of a particular drive unit. joined or press-fitted.

A power take-off unit is a device that implements AWD (All wheel drive) by transferring the driving force of the engine/transmission to the rear wheels in a front-wheel drive (FF) vehicle. It is manufactured in various types.

The power take-off unit should be manufactured in an optimal size and configuration in a limited space in consideration of the location and size of the engine and transmission, satisfy high-efficiency driving conditions, and generate optimized vibration and noise from gear and drive system vibration noise. It is preferable to

The power take-off unit having such characteristics is provided with a ventilation chamber (not shown) inside a casing (not shown) forming an outer shape, and when the internal pressure increases due to 4WD (4 wheel drive) driving, the ventilation chamber (not shown) is provided. It is provided to provide a space to facilitate pressure relief.

In addition, the ventilation chamber serves to block the driving oil from penetrating when the pressure is discharged to the outside of the casing. Conventionally, a ventilation valve coupled to the outside of the casing is provided and used to regulate the pressure inside the casing.

In the ventilation valve, when the inlet of the ventilation chamber is momentarily closed, internal oil leaks out of the casing, or moisture flows into the casing from the outside, so a countermeasure is required.

US Patent 7984791

Embodiments of the present invention are to provide a ventilation chamber of the power take-off unit that can prevent oil leakage to the outside of the casing by changing the structure of the baffle plate installed in the ventilation chamber.

The ventilation chamber of the power take-off unit according to the present embodiment includes a casing 100 forming the outer shape of the power take-off unit 1; A plurality of gear units (G) provided on the inside of the casing (100); As the plurality of gear units (G) are operated, the inner area ( A) the ventilation chamber 200 is formed; a partition wall 210 covering the lower side of the ventilation chamber 200 to block the oil scattering toward the inner region A while the gear unit G is rotated; and a baffle plate 220 installed in the ventilation chamber 200 to simultaneously cover the front and lower sides of the ventilation chamber 200 .

The gear unit (G) is located at the lower end of the ventilation chamber 200 and a first gear (G1) rotated in a first rotation direction; It is located on the left side of the ventilation chamber 200, and includes a second gear (G2) that is toothedly coupled to the first gear (G1) and outputs a rotational force to the outside of the casing (100), the ventilation chamber 200 is a first opening (202a) with a lower surface partially opened toward the gear unit (G) when viewed from the front by separating the casing (100); a second opening (202b) opened toward the front of the casing (100); The baffle plate 220 includes a seating portion 204 formed along an edge while facing the front of the casing 100 to be seated.

The partition wall 210 is a first provided on one side with respect to the first opening 202a so that the oil that is scattered outwardly does not move to the ventilation chamber 200 while the second gear G2 is rotated. bulkhead 212; a second partition wall 214 protruding from the inner surface of the inner region (A); and a third partition wall 216 provided on the other side of the first opening portion 202a and covering the lower side of the ventilation chamber 200 in different areas along the inner circumferential direction of the casing 100 . .

The first partition wall 212 has an inclined portion 212a that is inclined downward toward the rear surface of the casing 100 from the lower side of the ventilation chamber 200 .

The third partition wall 216 extends through the inside of the baffle plate 220 to a predetermined length.

The third partition wall 216 is characterized in that it forms the same plane as the seating portion 204 at some positions.

The baffle plate 220 includes a first plate 222 in close contact with the seating portion 204; and a second plate 224 bent to a predetermined length toward the first partition wall 212 and the third partition wall 216 from the extended end of the first plate 222 .

One side of the second plate 224 is in close contact with the lower surface of the first partition wall 212 , and the other side is positioned to be spaced apart from the third partition wall 216 in a radial direction.

The second plate 224 has a surface facing the first gear G1 and is rounded with a predetermined curvature outward in the radial direction.

The casing 100 is formed with a vent part 230 that communicates with the opening hole 102 opened in the upper region A and is inclined upwardly toward the outside.

The ventilation chamber of the power take-off unit according to the present embodiment may prevent external leakage of the oil through the partition wall through which the churning oil of the gear unit does not flow into the inner region.

Embodiments of the present invention can be used by using a baffle plate in the form of a cut-out to minimize the inflow of oil into the inner region and guide the movement direction.

Embodiments of the present invention change the casing into a two-piece form to reduce cost and improve packaging performance.

1 is an exploded perspective view showing a power take-off unit according to an embodiment of the present invention;
2 is a view showing an internal configuration of a power take-off unit according to an embodiment of the present invention.
3 is a perspective view illustrating a ventilation chamber and a partition wall according to an embodiment of the present invention;
Figure 4 is a perspective view showing a baffle plate according to an embodiment of the present invention.
5 to 6 are diagrams of a state of use of a baffle plate according to an embodiment of the present invention.
7 is a longitudinal cross-sectional view showing a vent unit according to an embodiment of the present invention.

A ventilation chamber of a power take-off unit according to an embodiment of the present invention will be described with reference to the drawings. For reference, FIG. 1 is an exploded perspective view showing a power take-off unit according to an embodiment of the present invention, FIG. 2 is a view showing the internal configuration of the power take-off unit according to an embodiment of the present invention, and FIG. 3 is this view A perspective view illustrating a ventilation chamber and a partition wall according to an embodiment of the present invention, and FIG. 4 is a perspective view illustrating a baffle plate according to an embodiment of the present invention.

1 to 4, the power take-off unit 1 according to the present embodiment is provided with a casing 100 forming an outer shape, and is located at a position in the 12 o'clock direction when the casing 100 is viewed from the outside. A ventilation chamber 200 in which the inner region A is formed is provided. In addition, a baffle plate 220 is installed in the ventilation chamber 200 to prevent oil that is scattered while operating the gear unit G, which will be described later, from flowing into the inner region A to prevent external leakage of the oil. do.

In the power take-off unit 1, the ventilation chamber 200 in which the inner area A of a predetermined size is formed is formed at the inner edge of the casing 100 forming the outer shape.

The ventilation chamber 200 is located at the 12 o'clock position with respect to the clockwise direction when the casing 100 is viewed from the outside and is not necessarily limited to the size and shape shown in the drawings.

The casing 100 is configured in the form of a two-piece combination of the housing 102 and the cover 104 so as to reduce the manufacturing cost and improve assembly according to the package. The housing 102 is formed as an integral type in which the pinion case into which the second gear G2 is inserted is not separately coupled as in the prior art. Also, for convenience of explanation, the inside of the housing 102 from which the cover 104 is separated corresponds to the front side.

A plurality of gear units (G) are operated in the casing ( 100 ) so that oil scattering radially outward from the inside of the casing ( 100 ) freely falls toward the gear unit (G) of the gear unit (G). The baffle plate 220 is installed in the inner region A formed with a predetermined size on the upper side to minimize the inflow of oil.

In addition, the partition wall 210 is formed to block the flow of oil scattered toward the ventilation chamber 200 .

To this end, in this embodiment, a casing 100 forming the outer shape of the power take-off unit 1, a plurality of gear units G provided inside the casing 100, and the plurality of gear units G are A ventilation chamber 200 in which an inner area A is formed in a predetermined size on the upper side of the gear unit G so that oil, which is scattered from the inside of the casing 100 while being operated, freely falls toward the gear unit G. ) and the partition wall 210 covering the lower side of the ventilation chamber 200 and the ventilation chamber 200 to block the oil from scattering toward the inner region A while the gear unit G rotates. ) and a baffle plate 220 installed in the ventilation chamber 200 to simultaneously cover the front and lower sides.

The gear unit G includes a first gear G1 positioned at a lower end of the ventilation chamber 200 and rotating in a first rotation direction, and a first gear G1 positioned on the left side of the ventilation chamber 200 , and the first It includes a second gear (G2) which is tooth-likely coupled to the gear (G1) and to which the rotational force is output to the outside of the casing (100).

The first gear G1 receives power from the transmission and rotates in a first rotational direction based on the drawing to scatter oil to the outside, and the first rotational direction corresponds to a counterclockwise direction.

The second gear G2 is provided to transmit rotational force (power) in the output direction in a tooth-like connection with the first gear G1, and is rotated in the direction of the arrow.

Since the first to second gears G1 and G2 are all rotated at high speed, some of the oil is scattered toward the ventilation chamber 200, and pressure due to heat is generated by the applied torque.

In this embodiment, the ventilation chamber 200 is provided in order to discharge the above-mentioned pressure, so that the pressure is discharged to the outside of the casing 100, and the oil inflow into the ventilation chamber 200 is minimized or the partition wall 210. As it is free-falling toward the direction of gravity and drained to the gear unit (G), external oil leakage is prevented.

For example, the first gear G1 and the second gear G2 rotate in different directions, and at the same time, the oil scatters in the rotation direction, so that the partition wall 210 and the baffle plate 220 are used. In this way, the amount of oil flowing into the inner region (A) is minimized and the pressure is released, so that stable operation can be promoted.

The ventilation chamber 200 includes a first opening 202a with a lower surface partially opened toward the gear unit G when viewed from the front by separating the casing 100 , and a front surface of the casing 100 . It includes a second opening 202b opened toward the , and a seating portion 204 formed along an edge of the casing 100 facing the front in order to be seated on the baffle plate 220 .

The first opening 202a is opened in an area corresponding to the circumferential direction and the inner depth of the housing 102 , and the second opening 202b is opened in the circumferential direction of the housing 102 .

In addition, the baffle plate 220 is coupled to the protrusion 230 formed on the seating portion 204 , and the protrusion 230 is not necessarily limited to the shape shown in the drawings.

The protrusion 230 is fastened to the baffle plate 220 by a caulking coupling method, but may be changed to another method.

The baffle plate 220 according to this embodiment includes a first plate 222 that is in close contact with the seating part 204 , and the first partition wall 212 and the third partition wall 212 at the extended end of the first plate 222 . and a second plate 224 bent to a predetermined length toward the partition wall 216 .

In the baffle plate 220 , the first and second plates 222 and 224 are bent at a predetermined angle as shown in the drawing to cover both the front and lower surfaces of the housing 102 .

The first plate 222 blocks the inflow of oil scattered to the front of the inner region (A), and the second plate 224 blocks the oil that may flow into the lower surface of the inner region (A) to prevent the oil from flowing into the casing (100). ) to prevent oil leakage to the outside.

Since one side of the second plate 224 is in close contact with the lower surface of the first partition wall 212 and the other side is positioned to be spaced apart from the third partition wall 216 in the radial direction, through the first partition wall 212 . The inflow of oil moving into the inner region A is stably blocked, and oil freely falls to the first gear G1 even in light oil through which some oil flows along the third bulkhead 216 .

As shown in the figure, the second plate 224 extends radially outward in a rounded shape, so even when the oil moves along the inner surface, it falls downward by its own weight in the direction of gravity. It is directed toward the gear unit (G).

Since the second plate 224 extends obliquely downward toward the rear surface of the housing 102, the oil introduced along the third partition wall 216 is free-falling in the direction of gravity toward the first gear G1, so that the oil External leakage is blocked.

3 to 6, the partition wall 210 according to the present embodiment removes the cover 104 to view the housing 102 from the front while the second gear G2 is rotated to the outside. The first partition wall 212 provided on one side with respect to the first opening 202a so as not to move the oil that is scattered into the ventilation chamber 200, and protruding from the inner surface of the inner region A The second partition wall 214 and the other side of the first opening 202a are provided to cover the lower side of the ventilation chamber 200 along the inner circumferential direction of the casing 100 with different areas and a third partition wall 216 .

When the first partition wall 212 is viewed from the position where the second gear G2 is located to guide the movement direction of the oil scattered in the direction of the arrow while the second gear G2 is operated in the direction shown in the drawing. formed in the shape of a triangle.

The first partition wall 212 has an inclined portion 212a that is inclined downwardly from the lower side of the ventilation chamber 200 toward the rear surface of the casing 100 so that oil is scattered to the first partition wall 212 . Afterwards, even when the baffle plate 220 is partially moved to the installed position a, it freely falls to the position b where the first gear G1 is located along the inclined portion 212a by its own weight.

In this case, the oil located at the inclined portion 212a and the oil located at an adjacent position may fall to the first gear G1 together, so that the oil movement to the inner region A is blocked.

The second partition wall 214 protrudes roundly with a predetermined curvature from the inner surface of the inner region A, so that even when some oil is moved vertically upward, movement is restricted by the protruding surface protruding round to the outside. It may be induced to fall toward the baffle plate 220 .

In this case, since the oil freely falls to the first gear G1 by the inclination and its own weight due to the shape of the baffle plate 220, oil leaks to the outside of the casing 100 through the inner region A This is prevented.

The third partition wall 216 extends to a predetermined length through the inner side of the baffle plate 220 , and maintains the same plane as the seating part 204 at some positions.

The third partition wall 216 extends a predetermined length in the circumferential direction of the housing 102 and has a rounded end, so that the probability of remaining oil is reduced.

For example, as the first gear G1 is operated, the oil is blocked by the baffle plate 220 and the flow is changed at the position c where the third partition wall 216 is formed, so that the inner region A of the ventilation chamber 200 is ) is blocked.

The inner region (A) has a predetermined size as shown in the figure and is formed on the inside of the housing 102 and communicates with the opening hole 102 formed on the inner upper portion to discharge the internal pressure of the casing 100 This is done easily.

The inner region (A) is formed in an open shape with the front and lower surfaces of the housing 102, and both the front and the lower surfaces are covered by the baffle plate 220, which will be described later, so that the inflow of oil is blocked.

The second plate 224 has a surface facing the first gear G1 that is extended to be rounded with a predetermined curvature outward in the radial direction, so that even when some oil is moved, it freely falls in the direction of gravity. It is possible to prevent the oil from moving to the inner region (A).

Referring to FIG. 7 , the casing 100 according to the present embodiment has a vent part 230 that communicates with the opening hole 102 opened in the inner region A and is inclined upwardly outward.

Since the vent part 230 is inclined at the first inclination angle θ1, air is discharged and the oil is moved to the inside of the casing 100 or does not leak to the outside, so the oil leakage to the outside can be prevented. .

In particular, since the oil freely falls along the second plate 224 of the baffle plate 220 in the direction of the arrow in the direction of gravity, external leakage of oil is stably prevented.

As described above, an embodiment of the present invention has been described, but those of ordinary skill in the art can add, change, delete or add components within the scope that does not depart from the spirit of the present invention described in the claims. It will be possible to variously modify and change the present invention by, etc., which will also be included within the scope of the present invention.

1: Power take-off unit
A: inner area
100: casing
200: ventilation chamber
202a, 202b: first and second openings
210: bulkhead
212, 214, 216: first, second, and third bulkheads
G: gear unit
G1, G2: 1st and 2nd gear

Claims (10)

a casing 100 forming the outer shape of the power take-off unit 1;
A plurality of gear units (G) provided on the inside of the casing (100);
As the plurality of gear units (G) are operated, the inner region ( A) the ventilation chamber 200 is formed;
a partition wall 210 covering the lower side of the ventilation chamber 200 to block the oil scattering toward the inner region A while the gear unit G rotates; and
and a baffle plate 220 installed in the ventilation chamber 200 to simultaneously cover the front and lower sides of the ventilation chamber 200 . According to claim 1,
The gear unit (G) is located at the lower end of the ventilation chamber 200 and a first gear (G1) rotated in a first rotation direction;
It is located on the left side of the ventilation chamber 200, and includes a second gear (G2) that is toothedly coupled to the first gear (G1) and outputs a rotational force to the outside of the casing (100),
The ventilation chamber 200 includes a first opening 202a with a lower surface partially opened toward the gear unit G when the casing 100 is separated and viewed from the front;
a second opening (202b) opened toward the front of the casing (100);
The ventilation chamber of the power take-off unit including a seating part 204 formed along an edge of the casing 100 facing the front side to be seated on the baffle plate 220.
3. The method of claim 2,
The partition wall 210 is a first provided on one side with respect to the first opening 202a so that the oil that is scattered outwardly does not move to the ventilation chamber 200 while the second gear G2 is rotated. bulkhead 212;
a second partition wall 214 protruding from the inner surface of the inner region A with a predetermined curvature;
A third partition wall 216 provided on the other side of the first opening 202a and covering the lower side of the ventilation chamber 200 in different areas along the inner circumferential direction of the casing 100 is included. The ventilation chamber of the power take-off unit.
4. The method of claim 3,
The first partition wall 212 is a ventilation chamber of the power take-off unit having an inclined portion 212a that is inclined downwardly toward the rear surface of the casing 100 from the lower side of the ventilation chamber 200 .
4. The method of claim 3,
The third partition wall 216 is a ventilation chamber of the power take-off unit extending to a predetermined length via the inner side of the baffle plate 220 .
4. The method of claim 3,
The third partition wall 216 is a ventilation chamber of the power take-off unit that forms the same plane as the seating portion 204 at some positions.
3. The method of claim 2,
The baffle plate 220 includes a first plate 222 that is in close contact with the seating portion 204;
The ventilation chamber of the power take-off unit includes a second plate 224 bent to a predetermined length from the extended end of the first plate 222 toward the first and third partition walls 212 and 216 . .
8. The method of claim 7,
The ventilation chamber of the power take-off unit is positioned so that one side of the second plate 224 is in close contact with the lower surface of the first partition wall 212 and the other side is spaced apart from the third partition wall 216 in a radial direction.
8. The method of claim 7,
The second plate 224 is a ventilation chamber of the power take-off unit in which the opposite surface facing the first gear G1 is rounded with a predetermined curvature outward in the radial direction.
According to claim 1,
The ventilation chamber of the power take-off unit is formed in the casing (100) with a vent part (230) that communicates with the opening hole (102) opened in the upper region (A) and is inclined upwardly outward.

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