JP2537256Y2 - Tachometer driving device in power unit engine of motorcycle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an improvement of a tachometer driving device in a power unit engine mounted on a motorcycle.

[Conventional technology and its problems]

The engine mounted on a motorcycle has a transmission room integrally provided behind the crankcase so that the speed can be shifted by a multi-stage gear transmission. On the other hand, the rotation of the engine is taken out to a tachometer driven gear and connected to the tachometer with a cable so that the rotation speed of the engine is displayed.

Attachment of the tachometer drive gear for driving the tachometer driven gear needs to be performed in consideration of various conditions. The tachometer drive gear may be attached to the crankshaft. However, in this case, the crankshaft becomes longer, the width of the engine case becomes larger, and the tachometer drive gear is located at the corner of the crankcase. There is a problem that oil is hardly applied and lubrication may be insufficient.

Further, there is a case where a tachometer drive gear is provided on a kick gear connected to the rear side of the transmission gear, and the tachometer driven gear meshes from the rear side of the kick gear. In this case, the kick shaft is generally located at the lower part of the crankcase, so the tachometer drive gear and the tachometer driven gear mesh with sufficient oil and there is no risk of wear, but between the kick shaft and the crankcase When the meshing portion is located, there is a problem that the front and rear lengths of the engine case are often increased in order to secure a space for the meshing portion.

Therefore, in the conventional tachometer drive device to be attached to a power unit engine of a motorcycle, no technique has been proposed which does not increase the size of the power unit engine and can provide sufficient lubrication.

In the case of a four-cycle engine, a tachometer drive gear may be provided on a cam shaft of a cylinder head to take out engine rotation on a cam chamber (for example, see Japanese Utility Model Application Laid-Open No. 57-97270). However, when each gear for taking out the engine rotation is provided, there is a problem that the cylinder head becomes large and the whole engine becomes large.

Further, there is a type in which a speedometer drive gear is provided at a rear end of an output shaft of an automatic transmission (see Japanese Utility Model Laid-Open No. 60-152860). However, when this technology is applied to a power unit of a motorcycle, the length of the output shaft (output shaft) of the transmission becomes longer, the width of the engine case becomes larger, and the size of the power unit becomes unavoidable. is there.

[Purpose of the invention]

This invention has been made in order to solve the above-mentioned conventional problems, and is a motorcycle power unit engine capable of sufficiently lubricating without increasing the size of an engine case and stirring a lubricating oil by a transmission gear. It is an object of the present invention to obtain a tachometer driving device.

[Means for solving the problem]

In order to achieve the above object, the present invention provides a transmission chamber integrally filled with lubricating oil at the rear of the crank chamber, and an intermediate shaft, an output shaft and a kick shaft parallel to the crank shaft at the rear of the crank shaft. And a plurality of transmission gear trains between the intermediate shaft and the output shaft, a kick idle gear rotatably mounted on one side of the transmission gear train, and a kick shaft. In a power unit of a motorcycle, which is engaged with a kicker mounted on a shaft, a tachometer drive gear that rotates integrally with a kick gear is rotatably mounted on an end of the kick shaft opposite to a kick lever, and the kick shaft is And between the output shaft, at the rear position of the small diameter of the gears mounted on the output shaft, the vertical axis is disposed in a direction substantially perpendicular to a plane passing through the axis of the output shaft and the kick shaft, Vertical axis The tachometer driven gear meshes with the tachometer drive gear, the other end of the vertical axis penetrates the transmission room, and is connected to the engine rotation transmission cable at the upper end of the vertical axis. It has a configuration of a tachometer driving device in a power unit engine.

[Action]

According to the present invention, a tachometer drive gear that rotates integrally with the kick gear is rotatably mounted on the end of the kick shaft opposite to the kick lever, and between the kick shaft and the output shaft, A vertical axis is arranged at a position rearward of a small diameter gear among the gears mounted on the output shaft in a direction substantially perpendicular to a plane passing through the axis of the output shaft and the kick shaft. The gap between the small-diameter gear (e.g., middle / high-speed gear) among the gears mounted on the output shaft and the kick shaft always has a certain size in the transmission room. , The space in the transmission room can be utilized without waste, and an increase in the size of the engine case can be avoided. Also, if the direction of the vertical axis is inclined with respect to a plane passing through the axis of the output shaft and the kick shaft, the vertical axis interferes with the gears of the output shaft, causing an increase in the size of the engine case. In the present invention, since the vertical axis is arranged in a direction substantially perpendicular to a plane passing through the axis between the output shaft and the kick shaft, the above-described interference can be avoided and the size of the engine case can be reduced.

Also, the tachometer driven gear at one end of the vertical axis meshes with the tachometer drive gear, the other end of the vertical axis passes through the transmission room, and the upper end of the vertical axis is connected to the engine rotation transmission cable. Is supported by the wall of the transmission room, so that the vertical axis is securely held without play.

〔Example〕

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

FIG. 1 is a cross-sectional view along a plane passing through the axis of the output shaft and the kick shaft of the power unit according to the embodiment, and FIG.
FIG. 3 is a longitudinal sectional view of the power unit along a vertical axis 17.

As shown in FIGS. 1 and 2, the power unit according to the embodiment has an engine case 1 integrally provided with a transmission chamber 3 in which a predetermined amount of lubricating oil is filled, on the rear side of a crank chamber 2. . The engine case 1 is made of a light alloy, for example, and is provided with a crank chamber 2 at a front portion and a transmission room 3 at a rear portion, and is divided into left and right parts. In some cases, it can be divided into upper and lower parts. Then, side cases 4 are connected to the left and right sides of the engine case.

In the crank chamber 2, a crank 5 is inserted and a crank shaft 6 is suspended. In the transmission room 3, an intermediate shaft 8a and an output shaft 8b, each of which is provided with a plurality of transmission gears 7a and 7b in a row so as to mesh with each other, are mounted around the transmission shaft. In this case, the intermediate shaft 8a, the output shaft 8b, and the kick shaft 13 are
Are respectively mounted on the rear side in parallel with the crankshaft 6.

The crankshaft 6 and the intermediate shaft 8a are connected via a primary reduction gear 9 and a clutch 10. At the other end of the output shaft 8b, an output sprocket 11 is attached.
Connect chain 12 to 11. Further, kick idle gears 20a and 20b are rotatably mounted on the intermediate shaft 8a and the output shaft 8b so that the idle gears 20a and 20b are meshed with one side of a row of transmission gears 7a and 7b mounted on the intermediate shaft 8a and the output shaft 8b. A kick shaft 13 is mounted on the rear side of the kick idle gear 20b, and a kick gear 14 is axially mounted on the kick shaft 13 via a one-way joint. Gear 20b)
Is engaged with a kick gear 14 mounted on a kick shaft 13.

Here, the transmission gear shaft mounted on the intermediate shaft 8a and the output shaft 8b
For 7a and 7b, the gear position is determined by the ratio of the diameters of the transmission gears 7a and 7b (also the ratio of the number of teeth). In FIG. 1, four sets of speed change gears (first to fourth speed gears) are provided corresponding to the four speed shifts. Gear) 7a ₄ , 7b ₄ , 2nd speed gear (second gear)
7a ₂ , 7b ₂ , third speed gear (third gear) 7a ₃ , 7
b ₃ , first speed gears (low gears) 7a ₁ and 7b ₁ are provided.

At the end of the kick shaft 13 opposite to the kick lever 21, a tachometer drive gear 15, which is press-fitted into the kick gear 14 and fixed and rotates integrally with the kick gear 14, is rotatably mounted on the shaft. Also, tachometer drive gear
An oil pump 16 is meshed with and driven at the end of 15.

Between the kick shaft 13 and the output shaft 8b, the output shaft 8b
Gear (in the embodiment, the third gear 7)
b ₃ ) At the rear position, the shaft 8bc between the output shaft 8b and the kick shaft 13
The vertical axis 17 is arranged in a direction substantially orthogonal to a plane (indicated by a symbol PS) passing through the lines 13c and 13c. The tachometer driven gear 18 at one end of the vertical axis 17 meshes with the tachometer drive gear 15, and the other end of the vertical axis 17 penetrates the transmission chamber 3.
Is connected to an engine rotation transmission cable 19 at the upper end, and is connected to the tachometer by the cable 19.

 Hereinafter, the operation of the embodiment will be described.

The rotation of the crankshaft 6 is controlled by the primary reduction gear 9 and the clutch 10
Through the transmission gear 7a mounted on the intermediate shaft 8a output shaft 8b,
The row of 7b and the kick idle gear 20a, 20b are rotated. The kick gear 14 meshing with the kick idle gear 20b also rotates, the tachometer drive gear 15 rotates the tachometer driven gear 18, and transmits the rotation from the longitudinal axis 17 to the tachometer via the cable 19.

The gap between the row of medium / high-speed gears (third speed gears 7a ₃ and 7b ₃ ) having a relatively small gear diameter and the kick shaft 13 has a certain size, and the longitudinal axis 17 is arranged in this gap. The space of the chamber 3 can be used without waste, and the engine case 1 can be prevented from being enlarged. Also, suppose that the arrangement direction of the longitudinal axis 17 is a plane PS passing through the axis cores 8bc and 13c of the output shaft 8b and the kick shaft 13.
If it is inclined with respect to the vertical axis 17, the vertical axis 17 may interfere with the small-diameter gear of the output shaft 8b and may cause an increase in the size of the engine case, but in the embodiment, the axis of the output shaft 8b and the kick shaft 13
Since the vertical axis 17 is arranged in a direction substantially perpendicular to the plane PS passing through 8bc and 13c, the vertical axis takes no space and the engine case 1
May be small.

Further, the transmission gear 7 lifts up the lower lubricating oil during rotation, and the tachometer driven gear 18 is located immediately after the transmission gear 7, and the lubricating oil is sufficiently lowered to ensure lubrication.

[Effect of the invention]

As described above, according to the present invention, the engine case can be made smaller by disposing the vertical axis in the gap between the transmission gear and the kick shaft. And the tachometer driven gear,
Lubricating oil can be reliably lubricated by the gears. Also, the vertical axis can be securely held without play.

[Brief description of the drawings]

FIG. 1 shows an embodiment of the present invention. FIG. 1 is a cross-sectional view of a power unit according to an embodiment of the present invention taken along a plane passing through the axis of a kick shaft and an output shaft. FIG. FIG. 3 is a longitudinal sectional view along a vertical axis 17. 2 ...... crank chamber, 3 ...... transmission chamber, 6 ...... _{crankshaft, 7a (7a 1 ~7a 4)} , 7b (7b 1 ~7b 4) ...... change gears, 8a ...... intermediate shaft, 8b ...... Output shaft, 8bc ... Center of output shaft, 13 ... Kick shaft, 13c ... Center of kick shaft, 14 ... Kick gear, 15 ... Tachometer drive gear, 17 ...
... vertical axis, 18 ... tachometer driven gear, 19 ... cable, 20a, 20b ... kick idle gear.

Claims (1)

(57) [Scope of request for utility model registration] A transmission chamber in which lubricating oil is filled is integrally provided at a rear side of a crank chamber, and an intermediate shaft, an output shaft, and a kick shaft are respectively provided at a rear side of the crank shaft in parallel with the crank shaft. A kick shaft having a plurality of transmission gear trains between the intermediate shaft and the output shaft, a kick idle gear rotatably mounted on one side of the transmission gear train, and a kick shaft mounted on the kick shaft. In a power unit of a motorcycle that is engaged with the kick shaft, a tachometer drive gear that rotates integrally with the kick gear is rotatably mounted on an end of the kick shaft opposite to the kick lever, and between the kick shaft and the output shaft. A vertical axis is arranged in a direction substantially perpendicular to a plane passing through the axis of the output shaft and the kick shaft at a position rearward of a small diameter gear among the gears mounted on the output shaft. Metered ribs Engaging a gear in the tachometer drive gear, the other end of the vertical axis is passed through the transmission chamber,
A tachometer drive device for a power unit engine of a motorcycle, wherein the tachometer drive device is connected to an engine rotation transmission cable at an upper end of a vertical axis.