Saddle-ride type vehicle

Patent metadata

Field	Value
Publication number	US-2018094601-A1
Application number	US-201715711188-A
Country	US
Kind code	A1
Filing date	Sep 21, 2017
Priority date	Sep 30, 2016
Publication date	Apr 5, 2018
Grant date	—

Abstract

In a saddle-ride type vehicle in which a cylinder head of a single-cylinder engine main unit has a front wall and a rear wall, an exhaust system being connected to the front wall and an intake system being connected to the rear wall, a joining surface of the cylinder head to a head cover is formed on a plane crossing a cylinder axis, the plane being inclined downward toward a front. Rotation axes of camshafts are arranged on the plane. An axis of a valve stem of a throttle valve is arranged on the plane. A curve cover curved so as to cover driven sprockets fixed to the camshafts is formed on one side in a vehicle width direction of the head cover. A drum housing box housing a throttle drum fixed to one end of the valve stem is arranged close to the curve cover.

First claim

What is claimed is:

1 . A saddle-ride type vehicle in which a single-cylinder engine main unit is mounted on a body frame, the engine main unit having: a crankcase; a cylinder body rising upward from an upper portion of the crankcase; a cylinder head connected to an upper portion of the cylinder body; and a head cover connected to an upper portion of the cylinder head, the cylinder head includes a front wall connected to an exhaust system and a rear wall connected to an intake system,
wherein a joining surface of the cylinder head to the head cover is formed on a plane crossing a cylinder axis, the plane being inclined downward toward a front, rotation axes of camshafts are arranged on the plane, the rotation axes of camshafts configuring a part of a valve train opening/closing an intake valve and an exhaust valve respectively supported by the cylinder head, an axis of a valve stem of a butterfly throttle valve is arranged on the plane, the butterfly throttle valve being provided to a throttle device configuring a part of the intake system, a curve cover is formed on one side in a vehicle width direction of the head cover, the curve cover being curved to cover driven sprockets that are fixed to the camshafts so that a cam chain for transmitting power from a crankshaft to the camshafts is wound around the driven sprockets, and a drum housing box is arranged close to the curve cover, the drum housing box housing a throttle drum fixed to one end of the valve stem, the drum housing box being annexed to the throttle device.

2 . The saddle-ride type vehicle according to claim 1 , wherein the head cover includes a rear wall formed with a relief recess corresponding to the drum housing box.

3 . The saddle-ride type vehicle according to claim 2 ,
wherein a cam chain passage through which the cam chain is traveled is formed in the engine main unit, a lead-out pipe for leading out breather gas is installed in the rear wall of the head cover, and the relief recess is arranged between the cam chain passage and the lead-out pipe when viewed from a direction along the cylinder axis.

4 . The saddle-ride type vehicle according to claim 1 ,
wherein the body frame includes:
a head pipe that steerably supports a steering handlebar;
a pair of right and left main frames extended backward from the head pipe;
a pair of right and left pivot frames connected to rear ends of the main frames, the pair of pivot frames being extended downward; and
a single down frame extended downward from the head pipe,
the engine main unit is arranged so as to be encircled by the head pipe, the main frames, the pivot frames and the down frame as seen in a side view, and a pair of exhaust ports are mutually independently formed in the cylinder head so that the pair of exhaust ports are arranged on opposite sides of a center line of a vehicle body passing a center in the vehicle width direction of the down frame as seen in a plan view, the pair of exhaust ports respectively corresponding to a pair of exhaust valves openably and closably arranged in the cylinder head, the pair of exhaust ports being open to the front wall of the cylinder head.

5 . The saddle-ride type vehicle according to claim 4 ,
wherein exhaust pipes configuring a part of the exhaust system and respectively connected to the pair of exhaust ports integrally includes:
a curved pipe portion having an upstream end connected to each exhaust port, the curved pipe portion being bent in a U shape beside the down frame; and
an inclined linear pipe portion having an upstream end connected to a downstream end of the curved pipe portion, the inclined linear pipe portion being extended backward while inclined to be located inside in the vehicle width direction as going toward the rear,
the inclined linear pipe portions are arranged so as to pass between the pair of right and left pivot frames, and an inclined face along the inclined linear pipe portion of one of the pair of exhaust pipes is formed in a protruded portion of a cam chain tensioner protruded from the rear wall of the cylinder head, the cam chain tensioner being provided to the rear wall of the cylinder head so as to adjust tension of the cam chain.

6 . The saddle-ride type vehicle according to claim 5 ,
wherein a rotor of a generator is fixed to one end of the crankshaft, a cam chain-driving sprocket for engaging the cam chain therewith is provided to an other end side of the crankshaft in a portion where a cylinder bore of the cylinder body is sandwiched between the portion and the generator, and a power transmission mechanism for starting that transmits power for starting from a starter motor installed in the crankcase to the crankshaft is arranged between the generator and the cylinder bore.

7 . The saddle-ride type vehicle according to claim 6 ,
wherein a front end of a swing arm is swingably supported by the pivot frames via a pivot, a rear end of the swing arm pivotally supporting a rear wheel, a rear cushion unit that buffers a swing of the swing arm is extended up and down and the rear cushion unit is arranged between the pair of right and left pivot frames, the pair of right and left exhaust pipes pass respectively between the pair of right and left pivot frames and the rear cushion unit and are extended backward, and exhaust mufflers are respectively connected to downstream ends of the exhaust pipes.

8 . The saddle-ride type vehicle according to claim 6 , wherein the down frame is provided with a pair of side walls that are inclined so as to approach each other as going to the rear in a longitudinal direction of the vehicle while respectively facing the curved pipe portions of the exhaust pipes.

9 . The saddle-ride type vehicle according to claim 7 , wherein the down frame is provided with a pair of side walls that are inclined so as to approach each other as going to the rear in a longitudinal direction of the vehicle while respectively facing the curved pipe portions of the exhaust pipes.

10 . The saddle-ride type vehicle according to claim 4 , wherein a center in the vehicle width direction of the down frame, the cylinder axis and a center of an intake port open to the rear wall of the cylinder head are arranged on the center line of the vehicle body as seen in the plan view.

11 . The saddle-ride type vehicle according to claim 5 , wherein a center in the vehicle width direction of the down frame, the cylinder axis and a center of an intake port open to the rear wall of the cylinder head are arranged on the center line of the vehicle body as seen in the plan view.

Assignees

• Honda Motor Co Ltd

Inventors

• Okada Nozomi
• Tani Yusaburo
• Hoi Yosuke
• Asano Tatsuhiko
• Ishida Shuichi
• Azumagakito Isao

Classifications

• F02F1/42 Primary

  Shape or arrangement of intake or exhaust channels in cylinder heads · CPC title

• F01N13/1805

  Fixing exhaust manifolds, exhaust pipes or pipe sections to each other, to engine or to vehicle body (pipe joints in general F16L; fixing auxiliaries in motor vehicles in general B60K) · CPC title

• F02D11/04

  characterised by mechanical control linkages (F02D11/06 takes precedence) · CPC title

• F02B61/02

  for driving cycles · CPC title

• F01N2590/04

  for motorcycles · CPC title