KR100921050B1 - differential gear and structure of oil-inflow thereof - Google Patents

Abstract

The present invention relates to a differential device and a lubrication guide structure thereof. In particular, the main flow path and the sub flow path are formed on the opposite edges of the differential device, respectively, and the main flow path and the sub flow path are respectively formed, and the left and right wheels of the vehicle are relatively fast. The present invention relates to a differential device and a lubrication guide structure thereof, which are intended to prevent partial wear of the differential device by selectively supplying hydraulic fluid to an inner one side or the other side of a housing in which gears connected to a rotating wheel are located.

Differential, flow path, control valve, vehicle speed sensor

Description

Differential gear and structure of oil-inflow

The present invention forms a main flow path and a sub flow path on the opposite edges of the differential device, respectively, and the interior of the housing in which gears are connected to a wheel that rotates relatively quickly among the left and right wheels of the vehicle. The present invention relates to a differential device and a lubrication guide structure thereof, which are intended to prevent partial wear of the differential device by selectively supplying hydraulic fluid to one side or the other side.

In general, the differential device is a device for smoothly changing the direction of the vehicle by changing the number of revolutions of the left and right wheels when the vehicle turns, and also to ensure the driving safety of the vehicle on uneven terrain.

Conventional differential devices include a ring gear that is rotated by being bitten by an output shaft of a transmission (not shown), a differential case in which the ring gear is assembled to an outer circumference and integrally rotated with the ring gear, and rotates inside the differential case. And a pinion gear installed in the vertical direction as possible, a pinion shaft for fixing the pinion gear to the differential case, and a side gear 60 meshed with the pinion gear in an orthogonal shape and installed on the left and right drive shafts, respectively.

In this case, an opening of a predetermined size is formed outside the differential case, and when rotated, an automatic transmission oil (hereinafter referred to as ATF) naturally flows in to circulate the internal gear friction parts so as to perform lubrication.

The pinion shaft is disposed so that both ends penetrate through the through-holes formed in the upper and lower portions of the differential case, and a pair of pinion gears are divided into upper and lower sides so as to face each other.

In the differential device configured as described above, when the same load is applied to the left and right wheels, the pinion gear revolves with the differential case, but when the load is applied differently, the pinion gear performs both revolution and rotation at the same time.

Accordingly, the rotational speed of the side gear is changed by the revolution and rotation of the pinion gear, and the rotational speeds of the left and right wheels are rotated at the same or differently as the left and right drive shafts to which the side gears are respectively connected are rotated at different speeds. .

In the prior art having the above configuration, when the vehicle is stopped, the ATF is filled up to the lower portion of the drive shaft of the differential case, but as the driving starts, the ATF flows into each drive element and the valve body inside the automatic transmission, so that the differential case is relatively different. The amount of lower ATF will be reduced.

Therefore, the conventional vehicle differential device is unable to concentrate supply to a place where a large amount of lubrication flow rate is required at the time of shifting, there is a problem that partial wear occurs in the gears in which the concentrated stress is instantaneously generated.

The present invention has been made to solve the above problems of the prior art, by forming a plurality of passages in the housing of the differential device, it is possible to supply the hydraulic fluid to the flow path of the required portion by intermittent the hydraulic oil supplied to each flow passage from the control valve Accordingly, an object of the present invention is to provide a differential device and a lubrication guide structure thereof, which are intended to prevent partial wear occurring at any moment in the operation of any gear.

The present invention for solving the above problems is the differential case formed inside the housing to be connected to the output shaft of the transmission, the pinion shaft disposed in the vertical direction to the differential case, left and right disposed on both sides based on the differential case A side gear, a pinion gear meshed with each of the left and right side gears in an orthogonal shape, and a top and bottom communication with one side edge of the housing divided by the pinion shaft to guide hydraulic oil to the left side gear and the pinion gear. It characterized in that the differential comprises a main flow path and a sub-flow passage in communication with the other side edge of the housing divided up and down to guide the hydraulic fluid to the right side gear and the pinion gear.

In addition, the present invention is a differential case formed inside the housing so as to be connected to the output shaft of the transmission, a pinion shaft disposed in the vertical direction to the differential case, left and right side gears disposed on both sides based on the differential case, the left A pinion gear meshing with each of the right side gears in an orthogonal shape, and a main oil which communicates with the left side gear and the pinion gear in an up and down communication with one side edge of the housing bisecting the pinion shaft. A sub-flow passage which communicates with the other edge of the housing up and down and changes the hydraulic fluid to the right side gear and the pinion gear, and is connected to the main flow path and the sub-flow path to detect the difference in the rotational speed of the vehicle left and right wheels. Connected to a wheel that rotates relatively quickly when detected on the Characterized by a lubricant guide structure of a differential device comprising an induction control valve to the flow of the hydraulic fluid in the main channel or the sub channel.

The differential device and the lubrication guide structure thereof according to the present invention configured as described above are provided with hydraulic oil during instantaneous operation of gears directly connected to the corresponding flow paths by supplying the hydraulic fluid whose flow direction is controlled in the control valve to a necessary flow path among the plurality of flow paths of the housing. Intensive supply of oil can prevent partial wear of gears.

The present invention is not limited to the described embodiments, and various modifications and changes can be made to those skilled in the art without departing from the spirit and scope of the present invention. Such modifications or modifications may be made to the present invention. It belongs to the claims of the.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a schematic view showing a lubrication guide structure of a differential device according to a preferred embodiment of the present invention.

As shown, a differential device according to a preferred embodiment of the present invention includes a housing 10, a differential case 20, a pinion shaft 30, a left side gear 42, a right side gear 44 and a pinion gear ( 50) is composed largely.

The housing 10 forms the contour of the differential and is connected to the output shaft of the transmission.

In addition, the differential case 20 is equipped with a ring gear (not shown) along the outer circumference, and through holes (not shown) are formed in the upper and lower portions so as to communicate with the inner space, respectively, the pinion shaft 30 Both ends of are inserted and arranged.

In particular, the ring gear is provided with a gear for biting the output shaft of the transmission on the outer periphery, and receives the shifted power from the transmission to be transmitted to the differential case 20.

At this time, the pinion shaft 30 is installed in the differential case 20 in a vertical direction, and a pair of pinion gears 50 are divided into an upper side and a lower side between the end portions inserted into the through-holes so as to face each other. .

Here, the pinion gear 50 is rotatably installed on the pinion shaft 30 and has a structure in which left and right sides are contacted and supported by the adjacent drive shaft 32.

In addition, the side gears 42 and 44 are splined to the drive shaft 32 to be integrally rotated and seated on the inner surface of the differential case 20.

At this time, the side gear is located on the left side gear 42 and the right side of the pinion shaft 30 (as seen in the drawing) located on the left side (as seen in the drawing) of the pinion shaft 30 inside the housing 10. It consists of the side gear 44.

In addition, the drive shaft 32 protrudes forward of the right side gear 44.

Since the drive shaft 32 and the pinion shaft 30 are operated together when the vehicle goes straight, relative motion does not occur, but when the vehicle turns, the relative rotation is performed.

At this time, the relative rotation difference generated at the time of turning of the vehicle is very small.

In particular, the housing 10 forms a main flow path 62 at one edge that is bisected based on the pinion shaft 30 and a sub flow path 64 at the other edge.

The main flow path 62 and the sub flow path 64 are formed to be communicated up and down at the edge of the housing 10 so as to receive the working oil from the outside and discharge it to a predetermined outside.

Here, the main flow path 62 serves to guide the hydraulic fluid to the left side gear 42 and the pinion gear 50 corresponding to the inside of the left side of the housing 10, and the sub-flow path 64 is the housing ( The right side gear 44 and the pinion gear 50 corresponding to the inside of the right side 10 serves to guide the hydraulic fluid.

In addition, the main flow path 62 and the sub flow path 64 are connected to the control valve 70.

The control valve 70 is to intermittently supply the hydraulic fluid to the main flow path 62 or the sub-flow path 64 connected to transfer the driving force to the wheel that rotates relatively quickly when the difference in the number of revolutions of the left and right wheels of the vehicle Play a role.

At this time, the control valve 70 is connected to the control unit 90, the control unit 90 is connected to the vehicle speed sensor (80).

The vehicle speed sensor 80 compares and determines the difference in the rotational speeds of the left wheel and the right wheel, recognizes the wheel that rotates relatively faster, and transmits a signal thereof to the controller 90.

Then, the controller 90 adjusts the control valve 70 to be selectively opened so that the hydraulic oil can be supplied to the main flow path 62 or the sub flow path 64.

In particular, when the left wheel and the right wheel of the vehicle are rotated at the same rotational speed, the control valve 70 controls to open the main flow path 62 and the sub flow path 64 at the same time.

Looking at the operation of the differential device according to the invention configured as described above are as follows.

First, when the vehicle speed sensor 80 detects that the left wheel and the right wheel of the vehicle are rotated at the same rotation speed, the control unit 90 detects this to open all the control valves 70.

Then, the working oil is simultaneously supplied to the main flow path 62 and the sub flow path 64 of the housing 10 in the same amount.

Thus, the ring gear formed in the housing 10 is rotated by receiving power from the axial shaft of the transmission, and the differential case 20 is rotated together by the ring gear being rotated.

Then, while the pinion shaft 30 also rotates along the differential case 20, power is simultaneously transmitted to the left side gear 42 and the right side gear 44 through the pinion gear 50, and the left side gear ( Power transmitted to 42 and right side gear 44 is transmitted to the wheels through drive shaft 32.

That is, the left side gear 42 transmits the rotational force to the left wheel, and the right side gear 44 transmits the rotational force to the right wheel.

Therefore, when the same load is applied to the left and right wheels, the drive shaft 32, the left side gear, the right side gear 44, the pinion shaft 30, and the differential case 20 are rotated together so that the vehicle goes straight. .

A relative rotation difference does not occur between the drive shaft 32 and the pinion shaft 30 as described above, and the pinion gear 50 performs idle only along the pinion shaft 30.

On the other hand, when the vehicle speed sensor 80 detects that the left wheel and the right wheel of the vehicle rotate at different rotational speeds, the control unit 90 detects this and connects the main flow path 62 of the control valve 70 or the like. The sub-channel 64 is selectively opened.

Then, the working oil is intensively supplied to the main flow passage 62 or the sub flow passage 64 of the housing 10.

Accordingly, the pinion gear 50 performs both revolution and rotation at the same time, thereby changing the rotation speed of the left side gear 42 disposed on the left side and the right side gear 44 disposed on the right side.

Since the drive shaft 32 respectively connected to the left side gear 42 or the right side gear 44 is also rotated at different speeds, the left and right wheels are rotated at different speeds to turn the vehicle.

In this case, the control valve 70 selectively opens the main flow path 62 or the sub flow path 64 directly or indirectly connected to the wheel which rotates the hydraulic fluid at a relatively high speed.

As a result, the gears that transmit the driving force to the wheels instantaneously when the left wheel or the right wheel rotates at a relatively high speed are partially supplied with the hydraulic oil through the main flow path 62 or the sub flow path 64. Is prevented.

1 is a schematic view showing a lubrication guide structure of a differential device according to a preferred embodiment of the present invention.

<Explanation of symbols on main parts of the drawings>

10: housing 20: differential case

30: pinion shaft 32: drive shaft

42: left side gear 44: right side gear

50: pinion gear 62: main euro

64: sub euro 70: control valve

80: vehicle speed sensor 90: control unit

Claims (2)

delete A differential case 20 formed inside the housing 10 so as to be connected to an output shaft of the transmission; A pinion shaft 30 disposed perpendicular to the differential case 20; Left and right side gears 42 and 44 disposed on both sides of the differential case 20; Pinion gears 50 meshed with the left and right side gears 42 and 44 in an orthogonal shape; The left side gear 42 and the pinion gear 50 which are in up and down communication with one side edge of the housing 10 divided by the pinion shaft 30 and correspond to the inside of the left side of the housing 10. A main flow path 62 for intensively guiding the working oil;  Sub-channels for communicating hydraulic fluid to the right side gear 44 and the pinion gear 50 corresponding to the inside of the right side of the housing 10 by being communicated up and down with the other divided edges of the housing 10. 64); And The main flow path 62 is connected to the main flow path 62 and the sub-flow path 64 and connected to the wheel which rotates relatively quickly when the vehicle speed sensor 80 detects the difference in the rotational speed of the vehicle left and right wheels. Lubricating guide structure of the differential device, characterized in that it comprises a control valve (70) for inducing the flow of the working oil to the sub-channel (64).

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