JP2022117257A - oil supply structure - Google Patents

Abstract

To provide oil supply structure capable of successfully supplying lubricating oil to a recessed oil supply portion which is recessed from the end face on one side of a rotary shaft.SOLUTION: In an output shaft 5, a recessed portion 21 which is recessed from the end face on one side is formed and a shaft center hole 23 is formed extending from the recessed portion 21 along the shaft center to the other side opposite to the one side. In the outer periphery of the output shaft 5, an oil intake port 24 is opened, and in the output shaft 5, a communication path 25 communicating the oil intake port 24 with the shaft center hole 23 is formed. Thus, when oil is taken from around the output shaft 5 into the oil intake port 24, the oil taken thereinto flows through the communication path 25 into the shaft center hole 23 and the oil is supplied from the shaft center hole 23 into the recessed portion 21.SELECTED DRAWING: Figure 1

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil supply structure in a device such as a transmission that requires oil supply for lubrication of various parts.

For example, in a vehicle equipped with an engine as a drive source for running, power of the engine is transmitted to drive wheels via a transmission. Engine mounting methods include vertical installation in which the crankshaft is oriented vertically with respect to the longitudinal direction of the vehicle body and horizontal installation in which the crankshaft is oriented horizontally. The longitudinal engine is often used in vehicles with an FR (front-engine, rear-wheel-drive) layout, that is, FR vehicles.

In an FR vehicle that employs a longitudinally mounted engine, the transmission is arranged behind the engine such that an input shaft to which power from the engine is input is longitudinally disposed with respect to the front-rear direction. For example, in an example of a vertical type manual transmission, a parallel two-shaft gear system is adopted, and the input shaft and the output shaft that outputs power to the propeller shaft are arranged on the same axis, and the power of the input shaft is changed. A counter shaft is provided in parallel with the input shaft and the output shaft to transmit to the output shaft.

JP 2006-97714 A

In such a manual transmission, in order to shorten the overall length and reduce the number of parts, the front end of the output shaft is provided with a circular recess that is recessed rearward, and the rear end of the input shaft is inserted into the recess. A configuration is conceivable in which a needle bearing is interposed between the rear end of the input shaft and the peripheral surface of the recess so that the rear end of the input shaft is held by the output shaft via the needle bearing.

However, in this configuration, the outer periphery of the needle bearing is surrounded by the front end of the output shaft, and the rear end of the input shaft is arranged inside the needle bearing, so lubricating oil does not easily reach the needle bearing. Therefore, if the lubricating oil used in the transmission is modified (for example, by reducing its viscosity) in order to reduce mechanical loss and improve vehicle fuel efficiency, there is a risk that the needle bearings will seize. .

SUMMARY OF THE INVENTION An object of the present invention is to provide an oil supply structure that can satisfactorily supply oil for lubrication to a concave oil supply portion that is recessed from one end face of a rotating shaft.

In order to achieve the above object, an oil supply structure according to the present invention supplies oil for lubrication to a recessed oil supply portion recessed from one end face of a rotating shaft. , a shaft center hole that communicates with the oil supply portion and extends from the oil supply portion along the shaft center to the other side opposite to the one side; A communication passage extending toward the oil supply portion is formed so as to communicate with the axial hole, and the diameter of the axial hole increases toward the oil supply portion.

In this oil supply structure, the rotary shaft is formed with a recessed oil supply portion that is recessed from one end face, and a shaft center hole extending from the oil supply portion along the axis toward the other side opposite to the one side is formed. It is An oil inlet is opened in the outer peripheral surface of the rotary shaft, and a communication passage is formed in the rotary shaft for communicating the oil inlet and the axial hole. As a result, when oil is taken into the oil intake port from the periphery of the rotating shaft, the taken oil flows into the axial hole through the communicating passage, and is supplied from the axial hole to the oil supply portion. Since the diameter of the shaft hole expands as it approaches the oil supply part, oil flows into the shaft hole due to the action of the inclination of the peripheral surface of the shaft hole due to the diameter expansion and the centrifugal force caused by the rotation of the rotating shaft. Oil flows well toward the oil supply. As a result, the oil for lubrication can be well supplied to the oil supply portion.

At least the end on the oil intake port side of the communicating passage widens downstream in the rotational direction of the rotary shaft as it approaches the oil intake port, and the oil intake port has a generally elliptical shape elongated in the circumferential direction of the rotary shaft. ing.

According to this configuration, at least the oil intake side end of the communicating passage widens downstream in the rotational direction of the rotary shaft as it approaches the oil intake port, so that the oil intake port extends in the circumferential direction of the rotary shaft. It has an elongated elliptical shape. Due to the shape of the oil intake and the inclination of the communication path, oil can be easily taken into the oil intake from the periphery of the rotating shaft. In addition, since the peripheral edge of the oil intake is partially chamfered, stress concentration around the oil intake can be alleviated.

ADVANTAGE OF THE INVENTION According to this invention, the oil for lubrication can be suitably supplied to an oil supply part, and seizing of the member arrange|positioned at the oil supply part can be suppressed.

1 is a cross-sectional view showing a portion of a manual transmission that employs an oil supply structure according to an embodiment of the present invention; FIG. It is the perspective view which looked at the vicinity of the oil slinger from the rear side. FIG. 4 is a cross-sectional view diagrammatically showing an output shaft and an oil guide plate;

BEST MODE FOR CARRYING OUT THE INVENTION Below, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

<Oil supply structure>
FIG. 1 is a cross-sectional view showing a portion of a manual transmission 1 employing an oil supply structure according to one embodiment of the invention. In FIG. 1, the hatching representing the cross section is omitted.

A vehicle in which the manual transmission 1 is mounted has an engine as a drive source and adopts an FR (Front-engine Rear-wheel-drive) layout. The engine is mounted in the front part of the vehicle in a vertical orientation such that the crankshaft is vertically oriented with respect to the front-rear direction of the vehicle (hereinafter simply referred to as "the front-rear direction"). A manual transmission 1 is arranged on the rear side of the engine.

A manual transmission 1 includes a transmission case 2 and an extension housing 3 coupled to the transmission case 2 from the rear side. A transmission case 2 and an extension housing 3 form an outer shell of the manual transmission 1 .

The manual transmission 1 also has an input shaft 4 , an output shaft 5 and a counter shaft 6 .

The input shaft 4 extends in the front-rear direction, and the front end of the input shaft 4 protrudes forward from the transmission case 2 and is connected to a clutch mechanism (not shown) outside the transmission case 2 . The power of the engine is input to the input shaft 4 via a clutch mechanism.

The output shaft 5 is arranged behind the input shaft 4 and extends on the same axis as the input shaft 4 . The output shaft 5 straddles the transmission case 2 and the extension housing 3 and its rear end protrudes rearward from the extension housing 3 . An insertion hole 11 through which the output shaft 5 is inserted is formed at the rear end of the transmission case 2 , and a bearing 12 is fitted in the insertion hole 11 . A bearing 13 is provided in the extension housing 3 at a position spaced rearward from the bearing 12 . The output shaft 5 is inserted through inner rings of bearings 12 and 13 and is rotatably supported by the transmission case 2 via the bearing 12 and rotatably supported by the extension housing 3 via the bearing 13. ing. Spaces 14 and 15 are provided around the output shaft 5 between the bearings 12 and 13 and behind the bearing 13, respectively. These spaces 14 and 15 function as oil reservoirs in which the oil supplied around the output shaft 5 is accumulated.

The front end of the output shaft 5 is formed with a recess 21 that is recessed rearward from the front end face in a substantially cylindrical shape. A rear end portion of the input shaft 4 is inserted into the concave portion 21 . A needle bearing 22 as a pilot bearing is interposed between the input shaft 4 and the peripheral surface of the recess 21 . It is held relatively rotatably at the front end.

Further, the output shaft 5 is formed with an axial center hole 23 that communicates with the concave portion 21 and is used for centering when the output shaft 5 is machined. The axial hole 23 extends rearward from the recess 21 along the axial center of the output shaft 5 and has a conical shape whose diameter decreases toward the rear, in other words, a conical shape whose diameter increases toward the front.

An oil intake port 24 is formed on the outer peripheral surface of the output shaft 5 at a position facing the rear end portion of the shaft center hole 23 in the radial direction of rotation. Further, the output shaft 5 is formed with a communication passage 25 extending in the rotational radial direction between the shaft center hole 23 and the oil intake port 24, and the shaft center hole 23 and the oil intake port 24 It communicates through the communication path 25 .

A spline 26 is formed on the outer peripheral surface of the rear end portion of the output shaft 5 . The spline 26 is coupled with a spline formed at the front end of the propeller shaft 27, and the spline coupling connects the output shaft 5 and the propeller shaft 27 so as not to rotate relative to each other.

The counter shaft 6 extends in the front-rear direction under the input shaft 4 in parallel with the input shaft 4 . The counter shaft 6 changes the speed of the power transmitted from the input shaft 4 and transmits it to the output shaft 5 . A rear end portion of the counter shaft 6 penetrates the transmission case 2 and protrudes into the extension housing 3 . An oil slinger 31 is supported at the rear end of the counter shaft 6 so as not to rotate relative to the oil slinger 31 for scraping up and scattering the oil accumulated at the bottom of the extension housing 3 .

FIG. 2 is a perspective view of the vicinity of the oil slinger 31 as seen from the rear side.

An oil guide plate 32 is provided between the output shaft 5 and the oil slinger 31 . The oil guide plate 32 includes a bottom plate portion 33 extending in the front-rear direction, a right side plate portion 34 extending upward from a right edge of the bottom plate portion 33, and a front edge of the bottom plate portion 33 and a front edge of the right side plate portion 34 connected to each other. a flange portion 36 projecting from the front end portion of the upper end of the right side plate portion 34 toward the output shaft 5; and a regulation wall portion 37 rising upward from the rear edge of the flange portion 36 have as one.

FIG. 3 is a sectional view schematically showing the output shaft 5 and the oil guide plate 32. As shown in FIG. Also in FIG. 3, the hatching representing the cross section of the output shaft 5 is omitted.

The communication passage 25 formed in the output shaft 5 spreads downstream in the rotational direction of the output shaft 5 as the end on the outer peripheral side of the output shaft 5 approaches the outer periphery, and is connected to the oil intake port 24 . It is As a result, the oil intake port 24 has a substantially elliptical shape elongated in the circumferential direction of the output shaft 5, and the communicating passage 25 has an inclined curved surface 38 inclined with respect to the radial direction of the output shaft 5. .

A flange portion 36 of the oil guide plate 32 extends from the upper end of the right side plate portion 34 toward the oil intake port 24 opened on the outer peripheral surface of the output shaft 5 . When the downstream end of the oil intake port 24 in the rotational direction is closest to the tip of the flange portion 36, the flange portion 36 and the inclined curved surface 38 of the communication passage 25 extend in substantially the same direction.

When the vehicle travels forward, the counter shaft 6 rotates clockwise when viewed from the rear side. The rotation of the counter shaft 6 causes the oil slinger 31 to rotate, and the oil slinger 31 scrapes up the oil accumulated at the bottom of the extension housing 3 . As the oil slinger 31 rotates clockwise when viewed from the rear side, part of the oil droplets scattered from the oil slinger 31 are received by the oil guide plate 32 and are deposited on the bottom plate portion 33 of the oil guide plate 32. accumulate. When the amount of oil accumulated in the bottom plate portion 33 exceeds the right side plate portion 34, the oil overflows over the right side plate portion 34. - 特許庁The oil that has climbed over the right side plate portion 34 flows over the flange portion 36 toward the output shaft 5 , flows down from the tip (right end) of the flange portion 36 , and pours onto the outer peripheral surface of the output shaft 5 .

When the oil intake port 24 traverses the flow of oil pouring down on the outer peripheral surface of the output shaft 5 from the flange portion 36 , the oil is taken into the communication passage 25 from the oil intake port 24 . As the end of the communication passage 25 on the side of the oil intake port 24 widens toward the downstream side in the rotational direction as it approaches the oil intake port 24 , the oil intake port 24 has a substantially elliptical shape elongated in the circumferential direction of the output shaft 5 . , the shape of the oil intake port 24 and the inclination of the communication passage 25 allow the oil to be taken into the oil intake port 24 satisfactorily. The oil taken into the communicating path 25 flows through the communicating path 25 toward the axial hole 23 and flows from the communicating path 25 into the axial hole 23 .

Since the diameter of the shaft center hole 23 increases as it approaches the recess 21, the inclination of the peripheral surface of the shaft center hole 23 and the action of the centrifugal force due to the rotation of the output shaft 5 cause the oil to flow into the shaft center hole 23. flows well toward the concave portion 21 . As a result, the oil can be well supplied to the needle bearings 22 arranged in the recesses 21 .

<effect>
As described above, oil for lubrication can be well supplied to the needle bearing 22 . Therefore, even if the viscosity of the oil used in the manual transmission 1 is reduced, seizure of the needle bearing 22 can be suppressed. Improvements can be made.

<Modification>
Although one embodiment of the present invention has been described above, the present invention can also be implemented in other forms.

For example, the oil received by the oil guide plate 32 may be supplied to members requiring oil lubrication, such as the bearing 13 arranged behind the oil guide plate 32 .

In addition, various design changes can be made to the above configuration within the scope of the matters described in the claims.

5: Output axis (rotating axis)
21: recess (oil supply part)
22: Needle bearing 23: Axial hole 24: Oil inlet 25: Communicating passage

Claims (2)

A structure for supplying oil for lubrication to a recessed oil supply portion recessed from one end surface of the rotating shaft,
The rotating shaft has
an axial center hole that communicates with the oil supply portion and extends axially from the oil supply portion to the other side opposite to the one side;
a communicating passage that is open as an oil inlet on the outer peripheral surface, extends from the oil inlet toward the axial hole, and communicates with the axial hole;
The oil supply structure, wherein the axial center hole increases in diameter as it approaches the oil supply portion. at least the end on the oil intake port side of the communication path widens downstream in the rotational direction of the rotary shaft as it approaches the oil intake port;
2. The oil supply structure according to claim 1, wherein said oil intake port has a substantially elliptical shape elongated in the circumferential direction of said rotating shaft.

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