KR20150146018A

KR20150146018A - Electric transfer case integrated oil pipe

Info

Publication number: KR20150146018A
Application number: KR1020140075753A
Authority: KR
Inventors: 김은희
Original assignee: 현대다이모스(주)
Priority date: 2014-06-20
Filing date: 2014-06-20
Publication date: 2015-12-31

Abstract

The present invention relates to an oil-pipe-integrated type electronic secondary transmission, and more particularly to an oil-pipe-integrated type electronic oil-hydraulic transmission having an oil-pipe- And an oil passage part communicating with the oil suction port and integrally formed in the case, the oil passage part having an internal flow path through which the oil flows. According to the present invention, instead of eliminating the conventional oil pump assembly existing in a separate assembly form, the oil circulation flow path in which the oil circulates inside the case is integrally provided with the case, thereby reducing the cost, So that the noise and vibration generated by colliding with the object can be prevented.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an electric oil-

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an electronic auxiliary transmission for a vehicle, and more particularly, to an oil-pipe-integrated electronic auxiliary transmission having an oil pipe integrally connected to an oil pump inside a case.

Generally, a vehicle is provided with a power transmission device to connect or disconnect the power generated by the engine and to decelerate or accelerate the running speed. The power transmission of the power transmitting device includes an engine, a clutch, a transmission, And an axle shaft.

In general, when a vehicle is running using a power transmission device, power is transmitted only to the front wheel or the rear wheel. However, in recent years, a four-wheel drive vehicle that simultaneously drives the front wheel and the rear wheel has greatly increased. The four-wheel drive system distributes the power of the engine evenly between the front and rear wheels, thereby increasing the rotational force applied to each wheel, thereby exhibiting excellent driving performance at uneven road surfaces such as unpaved roads and ice roads. In addition, the four-wheel drive system has the advantage of increasing the ability of accelerating or decelerating the engine torque sufficiently to the road surface and increasing the driving stability by transmitting the driving force to all four wheels during driving, It is also popular for life.

A four-wheel drive vehicle can be largely divided into a part-time mode in which the power to the front wheels is controlled in accordance with the transmission mode of the transmission and a full-time mode in which the four-wheel drive state is always maintained. The part-time system applies a transfer case to selectively convert engine power to two-wheel or four-wheel drive in a manner that can convert a two-wheel drive or four-wheel drive system depending on road conditions. The auxiliary transmission is a kind of auxiliary transmission for distributing the power through the transmission to all the wheels, and is installed at one side of the transmission to distribute the power of the engine transmitted to the front and rear wheels.

In the above-described auxiliary transmission and the transmission, various rubbing means such as various gears and brakes are provided for realizing the respective gear positions, and a hydraulic pressure control system for controlling the rubbing means by hydraulic pressure is provided.

As disclosed in Korean Patent Publication No. 10-1360428, an oil pump is installed in a transmission, and the oil introduced into the transmission passes through an oil filter and then lubricates the transmission through an oil pipe through an oil pump . This structure is similar to the auxiliary transmission, and an oil filter and an oil pipe for supplying oil for cooling and lubrication, and an oil pump are mounted in the form of an assembly in the transmission and the auxiliary transmission.

However, this type of oil circulation structure has a problem in that it is difficult to avoid vibration and noise during operation because the gap between the oil pump assembly and a case for accommodating the oil pump assembly is small, and there is a problem of time and cost increase of the oil pump assembly. In particular, in the case of an electronic auxiliary transmission, since the oil is transmitted to the rear output shaft through the oil pump, the rotational force is transmitted to the oil pump when the rear output shaft rotates. Therefore, vibration and noise .

Korean Patent Registration No. 10-1360428 (Registered on Aug. 10, 2007)

SUMMARY OF THE INVENTION An object of the present invention is to provide an oil-pipe-integrated electronic auxiliary transmission in which oil can be directly introduced into an oil pump by integrally forming an oil circulation flow path connected to the oil pump inside the case.

The oil pump integrated type electronic auxiliary transmission according to the present invention comprises a casing having an inlet portion through which oil flows in one side, an oil pump installed inside the casing, the oil pump having one end communicated with the inlet portion, And an oil passage portion communicating with the inlet port and formed integrally with the case and having an inner oil passage through which the oil flows, wherein the oil passage portion includes an outer wall integrally formed with the case, And the inner flow path may communicate with the inflow portion and the oil suction port.

The inner flow path preferably has a smaller diameter at an end portion communicating with the oil suction port than a diameter of an end portion communicating with the inflow portion.

A spiral groove may be formed in the inner circumferential surface of the inner flow path.

And an oil filter integrally formed on the inner side of the inflow portion.

The case may further include a partition wall formed on the inner side of the inflow portion and guiding the oil that has passed through the oil filter to the inner flow path.

And the partition wall is formed integrally with the outer wall of the inner flow passage.

The oil pump integrated type electronic auxiliary transmission according to an embodiment of the present invention may be configured such that the oil circulation flow path in which the oil circulates inside the case is integrally formed with the case instead of eliminating the existing oil pump assembly existing in the form of a separate assembly, And the noise and vibration generated when the oil pump assembly collides with the case is prevented.

In addition, since the oil circulates along the oil passage inside the case, there is an advantage that not only the cooling and lubrication of the rear output shaft but also the cooling effect of the case itself can be obtained.

Furthermore, since the flow path from the inflow portion of the oil to the oil pump is shortened, the pressure loss is reduced to increase the suction amount of the oil and the efficiency of the oil pump, and the durability of the auxiliary transmission is improved.

1 is a block diagram showing an installation position of an oil-pipe-integrated electronic sub-transmission according to an embodiment of the present invention;
2 is a perspective view showing an oil-pipe-integrated electronic secondary transmission according to an embodiment of the present invention,
FIG. 3 is a perspective view showing the inside of an oil-pipe-integrated electronic secondary transmission according to an embodiment of the present invention,
4 is a perspective view showing the inside of an oil-pipe-integrated electronic sub-transmission according to another embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an oil-pipe-integrated electronic auxiliary transmission according to an embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram showing an installation position of an oil-pipe-integrated electronic auxiliary transmission according to an embodiment of the present invention, FIG. 2 is a perspective view showing an oil-pipe-integrated electronic auxiliary transmission according to an embodiment of the present invention, FIG. 3 is a perspective view illustrating an interior of an oil-pipe-integrated electronic auxiliary transmission according to an embodiment of the present invention, and FIG. 4 is a perspective view illustrating an interior of an oil-pipe-integrated electronic auxiliary transmission according to another embodiment of the present invention.

1, a drive system of a four-wheel drive vehicle according to the present invention includes a transmission 5 that receives power from an engine 1 and performs a shift according to a shift operation, And a secondary transmission 10 for transmitting driving force to rear wheels or front wheels.

2, the auxiliary transmission 10 according to the embodiment of the present invention includes a front wheel power transmitting means for transmitting the driving force transmitted from the transmission 5 to the front wheel within the case 100, And accommodates the power transmitting means. The case 100 of the auxiliary transmission 10 is constituted by a front case 110 and a rear case 120 and includes a front output shaft 200 as a constituent of the front wheel power transmitting means and a rear output shaft (300) pass through the front case (110) and the rear case (120), respectively.

3, the oil filter unit and the oil pipe are separately provided in the case 100, the oil filter unit is provided in the inlet 130 of the case 100, (100) is provided with an integral oil passage (160) through which oil is circulated. The oil passage 160 communicates with the oil filter 400 and the oil filter 400 mounted in the case 100.

The oil for cooling and lubrication is circulated through the oil cooler outside the auxiliary transmission 10 to be heat-exchanged and cooled and then supplied again to the auxiliary transmission 10 at this time when the oil is formed on one side of the case 100 of the auxiliary transmission 10 And flows into the secondary transmission 10 through the inlet 130. [ The inlet 130 is formed at one side of the case 100 adjacent to the oil cooler. A partition wall 140 is provided on the inner side of the inflow part 130 to form a predetermined size space. An oil filter 150 is provided in a space created by the partition wall 140. The oil introduced by the partition wall 140 is guided to the oil passage portion 160 without flowing into the case 100. A part of the partition wall 140 is extended and connected to the outer wall 162 of the oil passage portion 160 to be described later.

The oil filter 150 may be detachably coupled to the inlet 130. Or the oil filter 150 may be integrally formed inside the inflow part 130 through a process such as a double injection or the like so that the oil filter 150 is inserted into the inflow part 130 and does not flow. The oil filter 150 filters the oil flowing into the case 100 to filter out foreign matter.

The oil passage 160 is formed integrally with the inner surface of the case 100 and forms a kind of flow path for guiding the oil to flow toward the oil pump 400. The oil passage 160 includes an outer wall 162 and an inner flow path 164 . The outer wall 162 extends from one side of the case 100 in the form of a pipe and has one end connected to one side of the partition wall 140 and the other end surrounding the oil suction port 410 of the oil pump 400 .

The inner flow path 164 is formed in a pipe shape in which oil flows along the longitudinal direction inside the oil flow path portion 160 in a state where the front case 110 and the rear case 120 are coupled. That is, in a state where the front case 110 and the rear case 120 are coupled, the oil passage portion 160 has a pipe-shaped internal passage 164 formed by an outer wall 162 having a predetermined thickness, The flow path portion 160 has a shape formed integrally with the case 100, rather than a separate pipe connected thereto. However, as shown in FIG. 3, when viewed from the front case 110 or the rear case 120 alone, the oil passage portion 160 has a groove through which oil flows. That is, a complete pipe shape of the inner flow path 164 is formed in a state where the front case 110 and the rear case 120 are coupled.

The other end of the oil passage 160 is connected to the oil inlet 410 of the oil pump 400 so that the oil pump 400 can be stably coupled to the oil passage 160. [ Direction so as to face the inner side surface of the case 100 in which the oil passage portion 160 is formed.

It is preferable that the internal flow path 164 of the oil flow path portion 160 has a structure in which the diameter gradually decreases from the oil filter 150 side toward the oil pump 400 side. When the diameter of the internal passage 164 becomes smaller toward the oil pump 400, the pressure at the end portion connected to the oil pump 400 increases and the flow rate of the discharged oil increases. Therefore, the capacity of the oil pump 400 can be reduced have.

When the inner flow path 164 is a pipe having a constant diameter, the oil can move in a state in which only a part of the inner flow path 164 is filled without flowing over the entire inner flow path 164. In this case, since the oil is not sucked uniformly by the oil pump 400, the efficiency of the oil pump 400 is lowered, so that it is difficult to reduce the size of the oil pump 400 to a predetermined size or less. If the diameter of the inner passage 164 is gradually reduced toward the oil pump 400, the oil can be filled and flowed through the entire inner passage 164, thereby improving the efficiency of the oil pump 400, 400) can be reduced.

4, the inner oil passage 164 has a spiral groove on the inner circumferential surface of the pipe-shaped oil passage. The oil passage 160 has a pipe- Or the like.

In the case where the oil passage 164 having the helical groove is provided, the movement speed of the oil is reduced, but the oil is guided to flow in a spiral manner, so that the oil can be moved evenly through the entire oil passage 164. Accordingly, although the flow rate of the oil is reduced, the oil flows uniformly along the inner flow path 164 and is conveyed to the oil pump 400 with a uniform pressure, thereby reducing the load on the oil pump 400. Further, since the inner flow path 164 has a spiral groove, the oil can pass through a wider area in the case 100, and the cooling effect of the case 100 can also be obtained.

Conventionally, an oil pump, an oil pipe to which the oil is transferred, and an oil filter are assembled in separate processes to make an oil pump assembly, which is then mounted inside the case. However, when the rear output shaft is rotated, the rotational force is transmitted to the oil pump assembly, which causes the oil pump and the oil pipe to shake. As a result, they collide with the case, thereby causing noise and vibration.

However, since the oil filter and the oil pipe are integrally formed in the case, the portion of the electromagnetic auxiliary transmission equipped with the oil pipe integrated type according to the embodiment of the present invention is less flowed even when the rotational force due to the rotation of the rear output shaft is transmitted. There is an effect to be reduced.

Further, since the straight line distance from the oil filter to the oil pump is shorter than that of the conventional oil pipe, the pressure loss is reduced, and the oil pump can efficiently absorb more oil, thereby improving the operating efficiency of the oil pump , The durability and the operating efficiency of the auxiliary transmission are improved.

One embodiment of the present invention described above and shown in the drawings should not be construed as limiting the technical idea of the present invention. The scope of protection of the present invention is limited only by the matters described in the claims, and those skilled in the art will be able to modify the technical idea of the present invention in various forms. Accordingly, such improvements and modifications will fall within the scope of the present invention as long as they are obvious to those skilled in the art.

10: auxiliary transmission 100: case
110: front case 120: rear case
130: inlet portion 140: partition wall
150: Oil filter 160: Oil passage part
162: Internal flow path 200: Front output shaft
300: Rear output shaft 400: Oil pump
410: Oil inlet

Claims

A case having an inlet portion through which oil flows in one side,
An oil pump mounted inside the case and having an oil suction port,
And an oil passage portion formed integrally with the case, the oil passage portion having an internal passage through which the oil flows, the oil passage portion being formed integrally with the case, the one end communicating with the inlet portion and the other end communicating with the oil inlet,
The oil passage portion
An outer wall formed integrally with the case, and the pipe-shaped inner channel, and the inner channel communicates with the inlet and the oil inlet.

The method according to claim 1,
Wherein the inner flow path has a smaller diameter at an end portion communicating with the oil suction port than a diameter of an end portion communicating with the inflow portion.

The method according to claim 1,
Wherein the inner flow path has a spiral groove formed on an inner peripheral surface thereof.

4. The method according to any one of claims 1 to 3,
Further comprising an oil filter integrally formed on the inside of the inflow portion.

5. The method of claim 4,
Wherein the case further includes a partition wall formed on the inner side of the inflow portion to guide the oil passed through the oil filter to the inner flow path.

6. The method of claim 5,
Wherein the partition wall is formed integrally with the outer wall of the inner flow passage by extending a part thereof.