JPH05288259A - Lubrication structure of power transmission - Google Patents

Abstract

PURPOSE:To perform lubrication of a power transmission arranged between an engine and a speed change gear by the simple structure. CONSTITUTION:Output of an engine is transmitted to a speed change gear 2 via a power transmission 3 which includes a chain 47 for example. The power transmission 3 is also lubricated by lubrication oil for lubricating the engine, For example, the lubrication oil from a cylinder head 51 is supplied to the power transmission 3 via a supply passage 52 (52A), and excessive lubrication oil is returned to an oil pan 26 via a discharge passage 53 (53A).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power transmission device lubrication structure, and more particularly to a power transmission device lubrication structure for transmitting engine output to a transmission.

[0002]

2. Description of the Related Art In a power plant such as an automobile power plant, it is common to arrange a transmission in series with an engine. In this case, the power plant is elongated and compact. Will be at a disadvantage.

For this reason, recently, Japanese Patent Laid-Open No. 2-13855
As shown in Japanese Unexamined Patent Publication (Kokai) No. 0, one in which a transmission is arranged in parallel with an engine is proposed. In this case, the crankshaft of the engine and the axis of the transmission are parallel to each other. As described above, in the power plant in which the engine and the transmission are arranged in parallel with each other, the power transmission device for transmitting the engine output to the transmission in the direction orthogonal to the crankshaft is used. A winding medium such as a chain or a belt is used as the transmission device.

[0004]

Needless to say, the above power transmission device needs to be lubricated, but how to perform this lubrication becomes a problem. In particular, it is desired to lubricate the power transmission device without complicating the structure for lubrication as much as possible.

Therefore, an object of the present invention is to provide a lubricating structure for a power transmission device, which can surely lubricate the power transmission device for transmitting the output of the engine to the transmission with a simple structure. ..

[0006]

In order to achieve the above object, the present invention has the following configuration. That is, in the lubrication structure of the power transmission device for transmitting the output of the engine to the transmission, the lubrication path for the power transmission device is configured such that the lubricating oil for the engine lubricates the power transmission device. It has such a configuration.

The power transmission device can be constructed, for example, as having a chain, and can be arranged in a power transmission chamber which is liquid-tight so that the lubricating oil does not leak. The power transmission device can be arranged at one end side in the crankshaft direction of the engine and at one end side in the axial direction of the transmission. In this case, it is preferable to dispose the differential device that receives the output from the transmission at the end opposite to the power transmission device, and the output extraction direction from the differential device can be the crankshaft direction.

The block for the engine and the casing of the transmission can be integrally molded. In this case, place the crankcase of the engine on top of the crankcase and on the crankcase.
As a separate structure from the lower part of the shoe, the upper part of the crank case can be formed integrally with the cylinder of the engine and with the casing of the transmission. Also, the crankcase
The lower portion of the shoe can be integrally formed with the casing of the differential device. The oil pan, that is, the oil pan that stores the lubricating oil for the engine and the power transmission device can be arranged below the lower portion of the crankcase. Note that the differential device can be arranged such that at least the lower portion thereof contacts the lubricating oil in the oil pan.

When the lubricating oil is supplied from the engine to the power transmission device, the lubricating oil after lubricating the cylinder head of the engine can be supplied to the power transmission device in consideration of the height positional relationship. ..

The lubrication path to the power transmission device may be an external pipe arranged outside the power plant, but the inside formed in the casing member forming the outer shell of the power plant. It can also be configured as a passage.

[0011]

According to the present invention, the lubricating oil for the engine can be shared as the lubricating oil for the power transmission device, and the structure for lubrication can be simplified. Further, since it is customary to inspect and replace the lubricating oil for the engine quite frequently, the lubricating oil for the power transmission device is always maintained in a preferable state suitable for lubrication. Further, as long as the power transmission device is driven by the engine, the power transmission device is lubricated even at the time of idling, for example, which is preferable for preventing a situation where the power transmission device is out of lubrication. Becomes

With the structure as described in claim 2, the power transmission device can be lubricated only by newly forming the lubricating oil supply passage and the discharge passage for the power transmission device. Further, with the configuration as described in claim 6, the lubricating oil can be supplied to and discharged from the power transmission device by gravity falling using gravity.

With the structure as described in claim 7, the lubrication path for the power transmission device can be provided without a great restriction on the layout relationship and design of other devices. Further, with the structure as described in claim 8, the formation of the lubricating path for the power transmission device can be formed at the same time as the formation of the casing member, and
The lubrication path is not exposed to the outside and the appearance is neat.

With the structure as described in claim 3, the power plant system as a whole can be made compact. Further, by adopting the configuration as described in claim 4, the rigidity of the power plant system can be dramatically improved. Further, by adopting the constitution as described in claim 5, while obtaining the effect of claim 3, casings such as crank casings and transmission casings constituting the outer shell of the power plant are obtained. This is advantageous in terms of manufacturing members and assembling them.

With the structure as described in claim 10, the lubricating oil for the engine is combined with the lubrication of the operating device, and the structure for lubricating the entire power plant is simplified. It will be. Preferred aspects of the invention and its advantages will also become apparent from the description of the examples below.

[0016]

Embodiments of the present invention will be described below with reference to the accompanying drawings. In FIG. 1, 1 is an engine, 2 is a clutch, 3 is a power transmission device, 4 is a transmission, and 5 is a differential device.

The engine 1 is, for example, an in-line 4-cylinder engine, and its crankshaft extends in the left-right direction in FIG. The transmission 3 is, for example, a manual transmission having five forward gears, and its axis extends in the left-right direction in FIG. The engine 1 and the transmission 3 are arranged in parallel to each other, that is, the crankshaft and the transmission axis are parallel to each other.

The clutch 2 is arranged at one end of the engine 1 in the crankshaft direction.
The power transmission device 3 is arranged on the opposite side to the one side, that is, on the one end side in the crankshaft direction. In other words, the power transmission device 3 is arranged on one axial end side of the engine 1 and the transmission 4.

The transmission 4 has an input shaft 10, an output shaft 11, and a counter shaft 12, and the output from the engine 1 is input to the input shaft 10 via the clutch 2 and the power transmission device 3. Between the counter shaft 12 and the output shaft 11, there are formed a plurality of gear trains for configuring the shift speed, and the portion of the gear trains is surrounded by a broken line as shown by reference numeral 13 in FIG. It is shown in a simplified form.

The differential device 5 is arranged in parallel with the engine 1 on the other end side in the axial direction of the transmission 4, that is, on the side opposite to the power transmission device 3. Output shaft 1 of transmission 4
1, an output gear 15 is attached to the output gear 1.
Power is transmitted from 5 to the differential device 5. The output take-out direction of the differential device 5 is set to be the crankshaft direction of the engine 1 as indicated by arrows a and b in FIG. As a result, when the engine 1 is placed horizontally with respect to the vehicle body, the output take-out direction from the differential device 5 matches the arrangement direction of the drive shafts connected to the left and right drive wheels.

The power plant PT consisting of the above-mentioned respective elements 1 to 5 is constructed so as to have one block shape as a whole, and this point will be described below with reference to FIG. As shown in FIGS. 2 and 3, the crankcase of the engine 1 is divided into a crankcase upper portion 21 and a crankcase lower portion 22. Crankcase
The upper portion of the seat is integrally formed with the engine cylinder 23 and the casing 24 of the transmission 4 by casting. Also,
The lower portion of the crank case 22 is integrally formed by casting so as to also form the casing 25 of the differential device 5. Then, with the lower surface of the crank case upper portion 21 in contact with the upper surface of the crank case lower portion 22, the both 21 and 22 are integrated by bolts. Further, the upper surface of the oil pan 26 is integrated with the lower surface of the lower portion 22 of the crankcase by bolts.

As described above, the crankcase of the engine 1
The casing 24 of the transmission 4 is constituted by the upper part 21 of the transmission, and the transmission casing 24 is made liquid-tight by using also a seal member or the like so as to prevent the lubricating oil from leaking. Is filled with the lubricating oil dedicated to the transmission 4, and the liquid level thereof is L1.
Indicated by.

The upper wall of the casing 25 of the differential device 5 is constituted by the bottom wall of the transmission casing 24, and the lower portion of the casing 25 is released toward the oil pan 26. There is. This differential device 5 has its output take-out shaft denoted by reference numeral 27 in FIGS. 2 and 3, and its input gear (ring gear) denoted by reference numeral 28 in FIGS. 2 and 3. And
The lower half of the input gear 28 is immersed in the lubricating oil in the oil pan 26. Of course, in the oil pan 26, lubricating oil for engine lubrication, that is, for the power transmission device 3 and for the differential device 5 is stored, and the liquid level thereof is indicated by reference numeral L2.

An oil pump (not shown) is arranged in the oil pan 26, and its drive shaft is designated by reference numeral 31 in FIGS. 2 and 3.
Indicated by. The drive shaft 31 is driven by the engine 1. From the gear 33 attached to the crank shaft 32 of the engine 1 at the end of the clutch 2 to the gear 34, the idle shaft 35, the sprocket 36, the chain 37, the sprocket. The driving force is transmitted to the drive shaft 31 via 38.

As shown in FIGS. 3 and 4, the clutch chamber 41 in which the clutch 2 is housed is composed of a crankcase upper part 21 and a lower part 22. A clutch output shaft 42 is arranged in the clutch chamber 41, and the crankshaft 32
The output shaft 42 is disconnected from the output shaft 42 by a known clutch mechanism (not shown) arranged in the clutch chamber 41.

A power transmission chamber 43, in which the power transmission device 3 is housed, is formed so as to be located in front of the clutch chamber 41 (on the right side in FIG. 1). The power transmission chamber 43 is composed of the crankcase upper portions 21 and 22 and the cover body 44, and is liquid-tightly formed by using a seal member or the like. In the power transmission chamber 43, one end of the clutch output shaft 42 extends, and a sprocket 45 is attached thereto. Further, in the power transmission chamber 43, the transmission input shaft 1
0 is extended and the sprocket 46 is attached here. And between both sprockets 45 and 46,
Chain 47 is wound. As described above, the power transmission device 3 is substantially constituted by the sprockets 45 and 46 and the chain 47.

Lubricating oil is stored in the liquid-tight power transmission chamber 43, and the liquid level thereof is indicated by reference numeral L3. In such a power transmission chamber 43, the engine 1
Is supplied, and at least a predetermined amount of lubricating oil is returned to the oil pan 26. More specifically, as shown in FIG. 4, the lubricating oil is supplied from the cylinder head 51 of the engine 1 to the power transmission chamber 43 through the supply pipe 52 that is externally piped, and the exhaust pipe is externally piped. Excess lubricating oil in the power transmission chamber 43 is returned to the oil pan 26 via 53.

Here, the lubricating oil receiving surface 51a of the cylinder head 51, that is, the surface 51a on which the lubricating oil drops after lubricating the bearing portion of the camshaft 55 arranged in the cylinder head 51 is at the highest position. Yes, then the liquid level L3 in the power transmission chamber 43 is high, and the oil pan 2
The liquid level L2 in 6 is set to the lowest position (the liquid level L1 in the transmission 3 is at an intermediate height position between L2 and L3). Therefore, the lubricating oil pumped up by the oil pump and pressure-fed to the cylinder head 51 is dropped onto the lubricating oil receiving surface 51a and then returned to the oil pan 26 after passing through the power transmission chamber 43 by gravity falling by gravity. It will be.

In FIG. 5, the lubricating oil passages corresponding to the pipes 52 and 53 form the outer shell of the power plant PT.
An example in which the internal passage 51A corresponds to the pipe 52 and the internal passage 53A corresponds to the pipe 5 is shown.
It is equivalent to 3.

Although the embodiment has been described above, the transmission 4
May be an automatic transmission, and in this case, a torque converter may be used instead of the clutch 2.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention.
The simplified top view which shows the whole plant.

FIG. 2 is a sectional view corresponding to line X2-X2 in FIG.

3 is a sectional view corresponding to line X3-X3 in FIG.

4 is a view of the power transmission chamber with the cover body removed, as viewed from the right side of FIG. 1, and is a view taken in the direction of the arrow X5 in FIG. 1.

FIG. 5 is a side sectional view showing a configuration of a clutch chamber and a power transmission chamber.

[Explanation of symbols]

 1: Engine 3: Power transmission device 4: Transmission 5: Differential device 21: Crank case upper part 22: Crank case lower part 23: Engine cylinder 24: Transmission case 25: Differential device case 26: Oil pan 27: Output take-out shaft (differential device) 31: Drive shaft (oil pump) 32: Crank shaft 43: Power transmission chamber 45: Sprocket 46: Sprocket 47: Chain 51: Cylinder head 51a: Lubrication oil receiving surface 52: Supply Pipe 53: Discharge Pipe 52A: Supply Internal Passage 53A: Discharge Internal Passage PT: Power Plant a, b: Output Extraction Direction of Differential Device L1: Lubricating Oil Liquid Level (Transmission) L2: Lubricating oil level (oil pan) L3: Lubricating oil level (power transmission chamber)

Claims (10)

[Claims] 1. A lubricating structure for a power transmission device for transmitting an engine output to a transmission, wherein a lubricating path for the power transmission device is provided so that the lubricating oil for the engine lubricates the power transmission device. A lubricating structure for a power transmission device, comprising: 2. The engine according to claim 1, wherein the engine and the transmission are arranged in parallel with each other, and the power transmission device transmits power in a direction orthogonal to a crankshaft of the engine. A transmission device is arranged in a power transmission chamber formed in a liquid-tight manner, the lubrication path is a supply side path for supplying the power transmission chamber with lubricating oil after lubricating the engine, and a lubricating oil in the power transmission chamber. With a discharge path that returns the oil to the oil pan of the engine. 3. The power transmission device according to claim 2, wherein the power transmission device is arranged at one end side in the crankshaft direction of the engine and at one end side in the axial direction of the transmission, and at the other end side in the axial direction of the transmission. A differential device is arranged in series with the transmission and in parallel with the engine, and a direction in which an output is taken out from the differential device is set to extend in the crankshaft direction. 4. The crankcase of the engine and the casing of the transmission are integrally formed with each other according to claim 3. 5. The crankcase of the engine according to claim 3, wherein the crankcase has an upper part and a lower part of the crankcase, and the upper part of the crankcase is the cylinder of the engine and the transmission. And a lower part of the crankcase for cooperating with the upper part of the crankcase to form a casing of the differential device. The oil pan is formed integrally with the casing, and the oil pan is disposed below the lower portion of the crank case. 6. The supply path according to claim 2, wherein the supply path is configured to supply lubricating oil from a cylinder head of the engine to the power transmission chamber. 7. The supply path and the discharge path according to claim 6, wherein the supply path and the discharge path are configured as external pipes arranged outside the engine and the power transmission chamber, respectively. 8. The casing according to claim 6, wherein the supply path and the discharge path are respectively formed in a casing member which constitutes an outer shell of a power plant including the engine, the transmission and the power transmission device. Configured as a closed internal passage. 9. The power transmission device according to claim 2, wherein the power transmission device includes at least a chain. 10. The differential device according to claim 5, wherein the differential device is arranged so that at least a lower portion of the differential device comes into contact with the lubricating oil in the oil pan.