JP2007285381A5 - - Google Patents

Description

Lubricating device for vehicle transmission

  The present invention relates to a crankcase of an engine that accommodates a transmission having a multi-stage transmission gear train, which extends in the arrangement direction of the multi-stage transmission gear train and is supplied with lubricating oil from a lubricating oil supply source. The present invention relates to an improvement in a lubricating device for a vehicular transmission, which includes an oil reservoir and an oil guide wall for guiding and flowing oil overflowing from the oil reservoir onto the transmission gear train.

Such a lubrication device for a vehicle transmission is already known as disclosed in Japanese Patent Application Laid-Open No. H10-228707.
Japanese Patent No. 3596675

  In conventional vehicular transmission lubrication devices, since the depth of the oil reservoir is constant, the amount of oil stored in the oil reservoir overflowing to the oil guide wall due to vehicle acceleration / deceleration and vibration is also the same for each part. Accordingly, the amount of oil supplied to the multi-stage transmission gear train is also uniform in each train.

  However, in a multi-stage transmission gear train, the high-speed system is generally used more frequently than the low-speed system, and thus high lubricity is required. Therefore, conventionally, oil supply according to the lubrication requirements of the high-speed system is required. The amount is set, but by doing so, a large capacity oil pump is required as a lubricating oil supply source.

  The present invention has been made in view of such circumstances, and a multi-stage transmission gear train is configured so that an amount of oil corresponding to the degree of lubrication requirement can be supplied to each of the multi-stage transmission gear trains. It is an object of the present invention to provide a lubricating device for a vehicle transmission that can prevent the increase in capacity of a lubricating oil supply source while ensuring the durability of the vehicle.

  In order to achieve the above object, the present invention provides a crankcase for an engine that houses a transmission having a multi-stage transmission gear train, wherein oil is supplied from a lubricating oil supply source extending in the arrangement direction of the multi-stage transmission gear train. In a lubricating device for a vehicle transmission comprising a groove-like oil reservoir to be supplied and an oil guide wall for guiding oil overflowing from the oil reservoir onto the transmission gear train, the oil reservoir is The first feature is that the depth is changed along the arrangement direction of the plurality of transmission gear trains.

According to the present invention, in addition to the first feature, the oil reservoir includes a first reservoir portion having a deep depth and a second reservoir portion having a shallow depth, and the first reservoir portion is formed in the multistage. place the corresponding positions of the high-speed gear train in the gear train, the second, characterized in that the second reservoir is arranged at a position corresponding to the low-speed gear train in the multi-stage transmission gear train.

  Furthermore, in addition to the second feature, the present invention has a third feature that the high-speed gear train is a third-speed gear train or a top gear train.

  Furthermore, in addition to the second feature, the present invention provides the oil reservoir and the oil guide wall at positions corresponding to the second gear train or the top gear train, excluding the low gear train in the transmission gear train. The first reservoir portion is disposed at a position corresponding to the third-speed gear train or the top gear train, and the second reservoir portion is disposed at a position corresponding to the second-speed gear train, and the low gear train includes an engine adjacent to the transmission gear train. The fourth feature is that oil for raising the crankshaft is supplied.

  Furthermore, in the present invention, in addition to any one of the second to fourth features, a step portion serving as a boundary between the first reservoir portion and the second reservoir portion is provided on the bottom surface of the oil reservoir. This is the fifth feature.

  According to the first aspect of the present invention, the depth of the oil reservoir is set according to the frequency of use of the multi-speed gear train, so that the oil reservoir is accumulated in the oil reservoir during acceleration / deceleration and vertical vibration of the vehicle. When oil flows into the oil guide wall at a stroke and is supplied to the transmission gear train, a relatively large amount of oil is transmitted to the frequently used transmission gear train, and a relatively small amount is transmitted to the infrequently used transmission gear train. Each oil will be distributed. By rationally using a limited amount of oil that is sent from the lubricating oil supply source to the oil reservoir, the transmission gear train can be uniformly maintained and the capacity of the lubricating oil supply source can be increased. It can be avoided.

  According to the second feature of the present invention, during acceleration / deceleration or vertical vibration of the vehicle, a relatively large amount of oil is supplied to the high-speed gear train that is frequently used from the first reservoir, and the frequency of use from the second reservoir. A relatively small amount of oil can be reliably distributed to the low-speed gear train having a low speed, which can contribute to improving the durability of the entire transmission gear train.

  According to the third feature of the present invention, during acceleration / deceleration or vertical vibration of the vehicle, a large amount of oil is supplied from the first reservoir to a particularly frequently used 3-speed gear train or top gear train, Durability can be increased.

  According to the fourth aspect of the present invention, during acceleration / deceleration or vertical vibration of the vehicle, a large amount of oil is supplied from the first reservoir to a frequently used third-speed gear train or top gear train, and their durability is improved. On the other hand, a small amount of oil is supplied from the second reservoir to the infrequently used 2-speed gear train, and the low gear train is supplied by the repelling oil of the crankshaft of the engine. Since the oil supply to the low gear train is stopped, the amount of oil supplied to the frequently used third-speed gear train or the top gear train can be increased to further improve the durability.

  According to the fifth aspect of the present invention, when the motorcycle is accelerated / decelerated or vertically oscillated, the oil outflow amount from the first reservoir portion and the oil outflow amount from the second reservoir portion can be differentiated. A limited amount of oil can be distributed more reasonably to the transmission gear train.

  Hereinafter, embodiments of the present invention will be described based on preferred examples shown in the accompanying drawings.

  1 is a longitudinal side view of a motorcycle engine provided with a lubricating device according to an embodiment of the present invention, FIG. 2 is an enlarged view of a transmission portion in FIG. 1, and FIG. 3 is a sectional view taken along line 3-3 in FIG. FIG. 4 is a diagram corresponding to FIG. 3, showing another embodiment of the present invention.

  First, in FIG. 1, reference numeral E denotes a four-cycle engine for a motorcycle, and when the motorcycle is mounted on the vehicle body, the cylinder portion 1 is arranged forward of the vehicle or slightly upward. Hereinafter, the front, rear, left and right in the engine E will be referred to based on the motorcycle on which the engine E is mounted.

  A transmission T is housed together with the crankshaft 3 in the crankcase 2 connected to the base of the cylinder portion 1. Therefore, the portion of the crankcase 2 that houses the transmission T also serves as the crankcase.

  As shown in FIGS. 1 to 3, the crankcase 2 includes a left first case half 2 a and a right second case half 2 b which are bolted to each other on a vertical plane including the axis of the cylinder portion 1. The crankshaft 3 is configured horizontally by the two case halves 2a and 2b, the input shaft 5 is disposed behind the crankshaft 3 in parallel with the crankshaft 3, and the rear of the transmission input shaft 5. And an output shaft 6 arranged in parallel with it.

  The transmission T includes input and output shafts 5 and 6 and multi-stage transmission gear trains arranged between the shafts 5 and 6, that is, a low gear train G1, a second gear train G2, a third gear train G3, And a top gear train G4.

  In the illustrated example, these transmission gear trains G1 to G4 are arranged in the order of a low gear train G1, a third gear train G3, a top gear train G4, and a second gear train G2 from the right side. Each establishment is selected by a known change mechanism 8, and when the motorcycle is operated, the transmission gear trains G1 to G4 are sequentially established to be transmitted from the crankshaft 3 to the input shaft 5. The rotation is shifted stepwise and transmitted to the output shaft 6 and further transmitted to the rear wheel of the motorcycle via a chain transmission 7 connected to the outer end of the output shaft 6.

  The first and second case halves 2a and 2b are formed with a vertical wall 10 that descends from the ceiling so as to approach the front part of the drive gear group of the transmission gear trains G1 to G4. Is formed with a groove-like oil sump 11 that opens rearward and extends in the direction in which the transmission gear trains G1 to G4 are arranged. The oil sump 11 has a joint surface between the first and second case halves 2a and 2b. A groove-like oil supply passage 12 formed on one of the two is opened. A part of the oil O discharged from a lubricating oil pump (not shown) of the engine E is supplied to the oil supply path 12, and the oil O is accumulated in the oil reservoir 11.

  The vertical wall 10 also includes a weir 13 that forms the rear edge of the oil sump 11, and a bowl-shaped oil guide wall that projects from the weir 13 to a position directly above the drive gear group of the transmission gear trains G1 to G4. 14 is integrally formed, and the oil O overflowing from the weir 13 is guided to the transmission gear trains G1 to G4 by the oil guide wall 14.

  The oil reservoir 11 is formed such that its depth changes along the direction in which the transmission gear trains G1 to G4 are arranged. Specifically, the oil reservoir 11 is configured by the first reservoir portion 11a having a deep depth and the second reservoir portion 11b having a shallow depth, and there is a step at the boundary between the first and second reservoir portions 11a and 11b. The part 11c is formed vertically. The first reservoir 11a is formed to correspond to the middle and high speed gear trains, for example, the third gear train G3 and the top gear train G4, and the second reservoir portion 11b is formed of the low speed gear train, for example, the low gear train G1 and It is formed to correspond to the second speed gear train G2.

  Next, the operation of this embodiment will be described.

  When the motorcycle is operated at a low speed and relatively quietly, when a part of the oil discharged from the lubricating oil pump of the engine E is supplied to the oil supply passage 12, the oil O is stored in the oil reservoir 11. After filling, it overflows from the weir 13 and is guided by the oil guide wall 14 to flow down onto the drive gear group of the transmission gear trains G1 to G4 to lubricate them.

  Also, during acceleration / deceleration operation or vertical vibration of the motorcycle, the oil O accumulated in the oil reservoir 11 jumps over the weir 13 at a stroke due to the inertial force and flows out to the oil guide wall 14 side to drive gears of the transmission gear trains G1 to G4. They are supplied to the group and lubricate them, but in practice there are more such lubrication modes.

  Incidentally, since the oil reservoir 11 is composed of the first reservoir portion 11a having a deep depth and the second reservoir portion 11b having a shallow depth, normally, a relatively large amount of oil O is contained in the first reservoir portion 11a. A relatively small amount of oil O is stored in the second reservoir portion 11b. Therefore, if the oil O in the first and second reservoirs 11a and 11b flows out to the oil guide wall 14 at a stroke due to acceleration / deceleration and vertical vibration of the motorcycle, the amount of oil flowing out from the first reservoir 11a is relatively large. However, since the amount of oil flowing out from the second reservoir portion 11b is relatively small, the oil supply amount to the third gear train G3 and the top gear train G4 corresponding to the first reservoir portion 11a is relatively large. The amount of oil supplied to the low gear train G1 and the second gear train G2 corresponding to the pool portion 11b is relatively small.

  Generally, in the transmission T, the high-speed gear train such as the third gear train G3 and the top gear train G4 is used more frequently than the low gear train such as the low gear train G1 and the second gear train G2. If the oil supply amount is increased on the high-speed gear trains G3 and G4 side and decreased on the low-speed gear trains G1 and G2, the limited amount of oil sent from the oil supply path 12 is changed to the transmission gear trains G1 to G4. In addition, it can be distributed according to the required degree of lubrication, and the durability of the transmission gear trains G1 to G4 can be ensured uniformly. Therefore, the engine lubrication pump, which is an oil supply source, has a particularly large capacity. There is no need to make it.

  Further, in the oil reservoir 11, the boundary between the first and second reservoir portions 11a and 11b is a vertical step portion 11c, so that the oil outflow from the first reservoir portion 11a during acceleration / deceleration and vertical vibration of the motorcycle. It is possible to make a difference between the amount and the amount of oil outflow from the second reservoir, and to distribute the limited amount of oil to the transmission gear trains G1 to G4 more rationally.

  Next, another embodiment of the present invention shown in FIG. 4 will be described.

  In this embodiment, the oil reservoir 11 and the oil guide wall 14 are provided at positions corresponding to the second gear train G2 or the top gear train G4 except the low gear train G1 in the transmission gear train, and the first reservoir 11a is provided. Arranged at the corresponding position with the third gear train G3 and the top gear train G4, the second reservoir 11b is disposed at the corresponding position with the second gear train G2, and the oil supply to the low gear train G1 This relies on oil splashing due to rotation of the crankshaft 3. Since the other configuration is the same as that of the above embodiment, the same reference numerals are given to the portions corresponding to those of the previous embodiment in FIG.

  According to this embodiment, during acceleration / deceleration and vertical vibration of the vehicle, a large amount of oil is supplied from the first pool portion 11a to the frequently used third-speed gear train G3 and top gear train G4, and their durability is increased. On the other hand, a small amount of oil is supplied from the second reservoir 11b to the second-speed gear train G2, which is less frequently used, and the oil supply from the oil reservoir 11 is stopped for the low gear train G1, and the engine crank Since the oil is lubricated with the shaft repelling oil, the amount of oil supply to the high-speed 3-speed gear train G3 and the top gear train G4 is increased by the amount of oil supply from the oil reservoir to the low gear train. The durability can be further increased.

  As mentioned above, although the Example of this invention was described, this invention is not limited to the said Example, A various design change can be performed in the range which does not deviate from the summary of this invention. For example, the number of gears of the transmission is not limited to four as in the above embodiment, but can be three or five or more. The present invention can also be applied to vehicle engines other than motorcycles.

1 is a longitudinal side view of a motorcycle engine including a lubricating device according to an embodiment of the present invention. The enlarged view of the transmission part in FIG. FIG. 3 is a sectional view taken along line 3-3 in FIG. 2. FIG. 4 is a view corresponding to FIG. 3 showing another embodiment of the present invention.

E ··· Engines G1 to G4 · · · Multi-speed gear train G1 · · · Low gear train G2 · · · 2nd gear train G3 · · · 3rd gear train G4 ··· ... Top gear train T ... Transmission 2 ... Crankcase 3 ... Crankshaft 11 ... Oil sump 11a ... First sump 11b... Second reservoir 11c... Step 12 ... oil supply path 14 ... oil guide wall

Claims (5)

A crankcase (2) of an engine (E) that houses a transmission (T) having multi-stage transmission gear trains (G1-G4) extends in the arrangement direction of the multi-stage transmission gear trains (G1-G4). A groove-like oil reservoir (11) to which oil (O) is supplied from a lubricating oil supply source, and oil (O) overflowing from the oil reservoir (11) are guided onto the transmission gear train (G1 to G4). In a lubricating device for a vehicle transmission comprising an oil guide wall (14) that performs
A lubricating device for a vehicular transmission, characterized in that the oil reservoir (11) is formed so that the depth thereof changes along the arrangement direction of the plurality of transmission gear trains (G1 to G4). The lubricating device for a vehicle transmission according to claim 1,
The oil sump (11), a first reservoir portion is deeper (11a), with depth constitutes de second reservoir shallow (11 b), the multi-stage first reservoir portion thereof (11a) It arrange | positions in a position corresponding to the high-speed gear train (G3, G4) in the transmission gear train (G1-G4), and the said 2nd pool part (11b) is the low-speed gear train in the same multistage transmission gear train (G1-G4). A lubricating device for a vehicle transmission, which is arranged at a position corresponding to (G1, G2). The lubricating device for a vehicle transmission according to claim 2,
A lubricating device for a vehicle transmission, wherein the high-speed gear train is a third gear train (G3) or a top gear train (G4) in the multi-speed gear train (G1 to G4). The lubricating device for a vehicle transmission according to claim 2,
The oil reservoir (11) and the oil guide wall (14) are provided at positions corresponding to the second gear train (G2) or the top gear train (G4), excluding the low gear train (G1) in the transmission gear train, The first reservoir (11a) is in a position corresponding to the third gear (G3) to the top gear train (G4), and the second reservoir (11b) is in a position corresponding to the second gear (G2). It is arranged, and the low gear train (G1) is supplied with repelling oil for the crankshaft (3) of the engine (E) adjacent to the transmission gear train (G1 to G4). Gearbox lubrication device. In the lubricating device of the transmission for vehicles in any one of Claims 2-4,
The bottom of the oil reservoir (11) is provided with a step portion (11c) serving as a boundary between the first reservoir portion (11a) and the second reservoir portion (11b). Transmission lubrication device.