JP2014114729A - Pressure sensor arrangement structure of engine unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pressure sensor arrangement structure of an engine unit which is compact, achieves excellent usability and handleability, and improves the detection accuracy etc.SOLUTION: An engine includes: a cylinder head 132; an intake pipe 142; and a crank case 130 composed of a crank chamber and a mission chamber 145 positioned at the rear side of the crank chamber. In the engine, one or multiple pressure sensors 11, 12 which detect a pressure in the engine are arranged. The pressure sensors 11, 12 are arranged in an area which is located above the mission chamber 145 and overlaps with the mission chamber 145 in a top surface view.

Description

  The present invention relates to an arrangement structure of a pressure sensor that detects intake pressure or the like in an engine of a vehicle such as a motorcycle.

  In this type of engine, various sensors are attached to monitor the operating state of the engine. The engine is appropriately controlled based on the data detected by the sensor. A plurality of parameters, such as pressure and temperature, are included as parameters to be detected, and various sensors corresponding to them are attached at appropriate positions of the engine.

  For example, the engine disclosed in Patent Document 1 includes a pressure detector that detects the crank chamber pressure in order to determine the fuel injection pressure based on the variation in the crank chamber internal pressure. The pressure detector is attached to a vehicle body frame above the engine, and the pressure detector and the crank chamber are connected via a communication pipe extending upward from the crank chamber.

  When connecting a pressure detector or a pressure sensor with a pressure detection hose, it is necessary to dispose the pressure detector or pressure sensor above the pressure detection port on the engine side so that dirt such as moisture and gas does not accumulate in the hose. In addition, the pressure detection sensor is mounted on the throttle body, the air cleaner box, or the vehicle body so as to prevent the pressure detection hose from being slackened.

JP-A-2-298632

  However, as the number of pressure detection sensors is plural, the arrangement of pressure detection hoses and harnesses has to be complicated. Moreover, the piping work of the pressure detection hose is usually performed after the engine is mounted on the vehicle body, which requires a considerable amount of work. Furthermore, there was a problem that it was necessary to attach / detach the pressure detection sensor and the hose together when the engine was attached / detached.

  In view of such circumstances, an object of the present invention is to provide a pressure sensor arrangement structure for an engine unit that is compact and excellent in usability and handling, and that improves detection accuracy.

  The pressure sensor arrangement structure of the engine unit of the present invention is an engine having a cylinder head, an intake pipe, and a crankcase made up of a crank chamber and a transmission chamber located behind the crank chamber. A pressure sensor arrangement structure in which one or a plurality of pressure sensors to be detected is arranged, wherein the pressure sensor is arranged above the mission chamber so as to overlap the mission chamber in a top view. To do.

In the engine unit pressure sensor arrangement structure of the present invention, the pressure sensor is connected by a pressure detection hose extending upward from a pressure detection port provided on a wall surface of a predetermined portion of the engine. And
In the pressure sensor arrangement structure for an engine unit according to the present invention, the pressure sensor is a crankcase internal pressure sensor that detects a pressure in the crank chamber.
In the pressure sensor arrangement structure for a motorcycle engine according to the present invention, the pressure sensor is an intake pressure sensor for detecting a pressure in the intake pipe.

  Further, in the pressure sensor arrangement structure of the engine unit of the present invention, the pressure sensor includes a crankcase internal pressure sensor for detecting the pressure in the crank chamber and an intake pressure sensor for detecting the pressure in the intake pipe, The case internal pressure sensor and the intake pressure sensor are integrally configured as module parts.

  In the pressure sensor arrangement structure of the engine unit according to the present invention, the crankcase internal pressure sensor is connected to the pressure detection hose led out from the downstream of the breather chamber.

  In the engine unit pressure sensor arrangement structure of the present invention, the pressure sensor is fixed integrally with the engine.

According to the present invention, an integrated sensor module can be arranged in a compact manner by effectively utilizing the empty space above the crankcase. Since the pressure detection hose connected to the sensor in the sensor module extends upward, the sensor is prevented from being damaged by oil or moisture.
In addition, by integrating multiple sensors into a single unit, it is possible to save space, reduce weight, simplify piping and wiring, and eliminate the need to remove the sensor when raising and lowering the engine. It is extremely easy to handle.

1 is a left side view of a motorcycle according to an embodiment of the present invention. It is a left view which shows the state by which the engine unit was mounted in the vehicle body frame in embodiment of this invention. It is a front view which shows the state by which the engine unit was mounted in the vehicle body frame in embodiment of this invention. It is a left view which shows the specific state in which the engine unit was mounted in the vehicle body frame in embodiment of this invention. It is a longitudinal section showing an example of composition of an engine unit concerning an embodiment of the present invention. It is a left view which shows typically the pressure sensor arrange | positioned in the engine unit in embodiment of this invention by relationship with a peripheral component. It is a right view which shows typically the pressure sensor arrange | positioned by the engine unit in embodiment of this invention in relation to peripheral components. It is a top view which shows typically the pressure sensor arrange | positioned in the engine unit in embodiment of this invention by relationship with a peripheral component. It is a rear view which shows typically the pressure sensor arrange | positioned by the engine unit in embodiment of this invention in relation to peripheral components.

Hereinafter, preferred embodiments of a pressure sensor arrangement structure for an engine unit according to the present invention will be described with reference to the drawings.
1 is a left side view of a motorcycle 100 according to an application example of the present invention, FIG. 2 is a left side view showing a state where an engine unit is mounted on a body frame, and FIG. 3 is a state where the engine unit is mounted on the body frame. FIG. That is, this embodiment is an example in which the present invention is applied to a motorcycle. First, the overall configuration of the motorcycle 100 will be described with reference to FIGS. In the drawings used in the following description, the front of the vehicle is appropriately indicated by an arrow Fr and the rear of the vehicle is indicated by an arrow Rr as necessary, and the lateral right side of the vehicle is indicated by an arrow R. Are indicated by arrows L, respectively.

  In FIG. 1, two front forks 103 are provided on the front of a main frame 101 made of steel or aluminum alloy so as to be turnable left and right by a steering head pipe 102. A handle bar 104 is fixed to the upper end of the front fork 103, and grips 105 are provided at both ends of the handle bar 104. A front wheel 106 is rotatably supported on the lower portion of the front fork 103, and a front fender 107 is fixed so as to cover the upper portion of the front wheel 106. The front wheel 106 has a brake disc 108 that rotates integrally therewith.

  The main frame 101 is connected to the rear portion of the steering head pipe 102, and a pair of left and right branches into a bifurcated shape toward the rear, and extends from the steering head pipe 102 while being widened rearward and downward. Note that the seat rail extends moderately from the vicinity of the rear portion of the main frame 101 to the rear ascending, and supports a seat described later. A body frame is constituted by the main frame 101 and the seat rail. A swing arm 109 is swingably coupled to the rear portion of the main frame 101, and a rear shock absorber 110 is mounted between the swing arm 109 and the swing arm 109. A rear wheel 111 is rotatably supported at the rear end of the swing arm 109. The rear wheel 111 is rotationally driven via a driven sprocket 113 around which a chain 112 for transmitting engine power, which will be described later, is wound. An inner fender 114 that covers the vicinity of the front upper portion is provided in the immediate vicinity of the rear wheel 111, and a rear fender 115 is disposed above the inner fender 114.

  The engine unit 116 mounted on the main frame 101 is supplied with an air-fuel mixture obtained by mixing fuel from the fuel tank and air from the air cleaner, and exhaust gas after combustion in the engine is exhausted from the exhaust pipe 117. Exhausted through. In the present embodiment, the engine may be, for example, a 4-cycle multi-cylinder, typically a 4-cylinder engine. The exhaust pipes 117 of the respective cylinders are coupled to the lower side of the engine unit 116, and then are exhausted from an exhaust device 118 (Marla) near the rear end of the vehicle through an exhaust chamber.

A fuel tank 119 is mounted above the engine unit 116, and a seat 120 is continuously provided behind the fuel tank 119. The sheet 120 includes a rider sheet 120A and a tandem sheet 120B. A footrest 121 and a footrest or pillion step 122 are arranged corresponding to the rider seat 120A and the tandem seat 120B.
Further, in FIG. 1, 123 is a headlamp, 124 is a meter unit including a speedometer, tachometer or various indicator lamps, and 125 is a rearview mirror supported by the handlebar 104 via a stay 126.

  In the vehicle exterior, the front and side portions of the vehicle are mainly covered by the fairing 127 and the side cowl 128, and a side cover or a seat cowl 129 is attached to the rear of the vehicle, and these exterior members have a so-called streamline type. The appearance form of the vehicle is formed.

  The engine unit 116 in this embodiment is abbreviated in FIGS. 2 and 3, and referring to FIG. 4, the cylinder 131, the cylinder head 132, and the cylinder head cover 133 are integrally coupled sequentially to the upper part of the crankcase 130. Become. Further, the engine unit 116 is suspended and supported by the main frame 101 through a plurality of engine mounts so as to be integrally coupled and supported by the main frame 101, and acts as a rigid member of the main frame 101 itself. As shown in FIG. 4, a seat rail 134 for attaching and supporting the seat 120 and the like extends from the rear portion of the main frame 101 obliquely upward to the rear.

  As shown in FIG. 1, a fuel tank 119 having a dome shape or a shell shape is mounted and supported on the main frame 101 so as to cover the entire upper side of the main frame 101 from above. An air cleaner 135 for supplying clean air to the intake system is disposed above the cylinder head cover 133 of the engine unit 116. The lower part of the fuel tank 119 is formed in a concave shape, and the fuel tank 119 is arranged so as to cover the air cleaner 135 from above as shown in FIG. Here, as shown in FIG. 3, the air cleaner 135 has an upper case 135 </ b> A and a lower case 135 </ b> B that are mutually closed, and has a substantially hollow structure. A pair of intake ducts 136 are connected to the front part of the lower case 135B, and air taken in from the front end part of the vehicle is introduced into the lower case 135B via the intake duct 136. The air introduced to the dirty side is purified by passing through a filter (not shown), and further supplied to the throttle body through the air funnel.

  In this embodiment, the engine unit 116 may be a parallel four-cylinder engine, and four cylinders are arranged in parallel in the left-right (vehicle width) direction as shown in FIG. Note that the cylinders are numbered 1 (# 1), 2 (# 2), 3 (# 3), and 4 (# 4) in order from the left. Here, the engine unit 116 will be described with reference to FIG. A cylinder block formed by integrally connecting the crankcase 130 (a crank chamber is formed at the front thereof), the cylinder 131, the cylinder head 132, and the cylinder head cover 133 is disposed in a moderately inclined posture.

  In the crankcase 130, an upper crankcase 130A and a lower crankcase 130B which are divided into upper and lower halves are coupled to each other, and a shaft such as a crankshaft 137 is supported on the mating surface 130C. The crankshaft 137 is disposed in the crankcase 130 in the vehicle width direction (the direction orthogonal to the plane of the drawing in FIG. 5). In this case, the plurality of journal portions of the crankshaft 137 are pivotally supported by the plurality of journal bearing portions set on the mating surface 130 </ b> C of the crankcase 130. A generator including a generator coil and a generator rotor is arranged at the left shaft end of the crankshaft 137. In this case, the generator coil is attached and supported inside the magnet cover 138 (see FIG. 4).

  A piston 139 is fitted into the cylinder bore of the cylinder 131 of each cylinder so as to be slidable in the cylinder axis Z direction. Piston 139 is connected to crankshaft 137 via connecting rod 140. In this case, the large end 140a of the connecting rod 140 is connected to the crankshaft 137 via the crank pin 137a, and the small end 140b is connected to the piston pin 139a. As the piston 139 reciprocates in the cylinder axis Z direction, the crankshaft 137 rotates. A combustion chamber 141 is formed between the upper end of the cylinder 131 and the cylinder head 132.

  In the cylinder head 132, an intake port 142 (intake pipe) and an exhaust port 143 are formed in communication with the combustion chamber 141. Although not shown between the combustion chamber 141 and the intake port 142 or the exhaust port 143, it is opened and closed by an intake valve and an exhaust valve. The cylinder head 132 houses a valve operating device that controls opening and closing of these intake valves and exhaust valves. With this valve operating system, these intake valve and exhaust valve are driven by an intake cam and an exhaust cam provided on the intake camshaft and the exhaust camshaft, respectively. In particular, a throttle body 144 (see FIG. 6, FIG. 7, etc.), which will be described later, constituting an intake device is disposed between the air cleaner 135 and the intake port 142, and the intake air amount is reduced by opening and closing the throttle valve. Can be controlled. A fuel supply device supplies fuel from the fuel tank 119 to an appropriate position in the middle of the intake port 142, and an injector that injects the fuel into the intake port 142 is mounted.

  The rear portion of the crankcase 130 also serves as a transmission case 145 (transmission chamber), and a transmission gear is accommodated therein. In the transmission case 145, a countershaft 146 is disposed in parallel with the crankshaft 137 at a predetermined interval rearward, and a drive shaft 147 is further disposed at a predetermined interval downward thereafter. Among these, the counter shaft 146 is supported by the mating surface 130 </ b> C of the crankcase 130. Further, a transmission device 148 (transmission) having a predetermined number of stages is arranged between the counter shaft 146 and the drive shaft 147 in the transmission case 145, and the rotation of the counter shaft 146 is performed via the transmission device 148 through the drive shaft 147. The gears are transmitted at a reduced speed.

  In the transmission device 148, the counter shaft 146 is provided with a gear train 149 (drive side) including a plurality of transmission gears along its axial direction as shown in FIG. Similarly, in the drive shaft 147, a gear train 150 (driven side) including a plurality of transmission gears is disposed along the axial direction thereof. A combination of transmission gears is set in advance so that the gear train 149 and the gear train 150 are engaged with each other according to the number of gears to transmit power, and a gear change is performed by a shift operation by a gear shift device.

  In the above case, as shown in FIGS. 6 and 7 in particular, the throttle body 144 is disposed below the lower case 135B of the air cleaner 135, and air is supplied to the throttle body 144 from the air funnel in the air cleaner 135. The throttle body 144 is disposed substantially in the vertical direction, and its lower end is coupled to the intake port 142. Further, as shown in FIG. 8, a throttle valve 152 driven by a drive motor 151 as a drive source is mounted in a throttle body 144 arranged in each cylinder so as to be rotatable by a predetermined angle.

  Referring to FIG. 5, a breather chamber 153 is formed at the rear of the transmission case 145, and this breather chamber 153 is connected to the crankcase 130 by a pipe (not shown). In this breather chamber 153, the blow-by gas sent from the crankcase 130 is gas-liquid separated.

In the cooling system of the engine unit 116, a radiator device 154 is disposed at the front of the cylinder block as shown in FIG. 6 or FIG. As shown in FIG. 6, a cooling water pump 155 for supplying cooling water to the cooling system is disposed at the lower part of the crankcase 130, and is cooled by the cooling water pump 155 via a cooling water hose 156 that interconnects the cooling systems. It is designed to circulate water.
Further, in the lubrication system of the engine unit 116, as shown in FIG. 7, an oil pump 157 is disposed at the front portion of the crankcase 130, and the lubricating oil is circulated by the oil pump 157.

  In the engine pressure sensor arrangement structure according to the present invention, the pressure sensor is disposed above the transmission case 145 so as to overlap the transmission case 145 in a top view. In this example, the pressure sensor module 10 is provided as shown in FIG. 8, FIG. 9, etc., the crankcase internal pressure sensor 11 for detecting the pressure in the crankcase 130 in the pressure sensor module 10, and the intake port 142. And an intake pressure sensor 12 for detecting pressure. The crankcase internal pressure sensor 11 and the intake pressure sensor 12 are integrally configured as module parts.

The crankcase internal pressure sensor 11 is connected to a predetermined part of the engine, in this example, a pressure detection hose 14 extending upward from a pressure detection port 13 provided on the upper wall surface of the breather chamber 153.
The intake pressure sensor 12 is connected by a pressure detection hose 16 extending upward from a pressure detection port 15 provided in a predetermined part of the engine, in this example, the side wall of the intake port 142. In the present embodiment, each of the intake ports 142 of the # 1 to # 4 cylinders is provided with a pressure detection port 15, respectively. Are connected by pressure detection hoses 16B.

  In the above case, the crank internal pressure 11 is connected to the pressure detection hose 14 derived from the downstream of the breather chamber 153.

  Further, the pressure sensor module 10 is packaged in a casing, and the casing is supported at an appropriate position of the crankcase 130 via a stay or bracket 17 as shown in FIG. Therefore, the crankcase internal pressure sensor 11 and the intake pressure sensor 12 are fixed integrally with the engine.

  In the above configuration, in order to reduce mechanical loss during engine operation, the pressure in the crankcase 130 is set to a negative pressure using a vacuum pump or the like. Therefore, the crankcase internal pressure sensor 11 detects the pressure in the crankcase 130, and the detection signal is sent to the vehicle-mounted ECU, and thus the pressure in the crankcase 130 is constantly monitored. Further, the intake pressure is detected by the intake pressure sensor 12, and based on the detection signal, the fuel injection of the injector is optimized by the ECU.

  According to the present invention, the crankcase internal pressure sensor 11 and the intake pressure sensor 12 are integrated as a pressure sensor module 10 in this example, and the empty space above the crankcase 130 is effectively utilized and arranged in a compact manner. Can do.

The crankcase internal pressure sensor 11 is a pressure detection hose 14 extending upward from the pressure detection port 13, and the intake pressure sensor 12 is a pressure detection hose 16 extending upward from the pressure detection port 15. 10 is connected.
If this type of sensor is connected as it is from the inside of the engine, oil or moisture will flow into the sensor section, and the sensor will be soiled or altered (corroded). In contrast, by extending the pressure detection hose 14 and the pressure detection hose 16 upward, moisture and oil can be returned to the inside of the engine.

In addition, the crankcase internal pressure sensor 11 can be arranged close to the crankcase 130 to improve detection accuracy (response) with respect to pressure fluctuation.
On the other hand, the intake pressure sensor 12 can also improve the detection accuracy (response) for the pressure fluctuation of the intake pressure.

Further, by integrating a plurality of sensors into a module, it is possible to save space, reduce weight, and simplify piping and wiring.
In this case, by integrating with the engine unit 116, it is not necessary to remove the crankcase internal pressure sensor 11 and the intake pressure sensor 12 each time the engine is raised or lowered. The pressure sensor module 10 can be handled as an engine assembly, and it is easy to handle and has excellent usability.

  Further, the crankcase internal pressure sensor 11 is connected to the pressure detection hose 14 led out from the downstream of the breather chamber 153, that is, attached to the position after the gas-liquid separation in the breather chamber 153. Can be prevented.

As mentioned above, although this invention was demonstrated with various embodiment, this invention is not limited only to these embodiment, A change etc. are possible within the scope of the present invention.
For example, the pressure detection port 15 of the intake pressure sensor 12 may be arranged in the intake pipe of the intake system. Further, the pressure sensor module 10 can be installed on the breather cover on the upper surface of the crankcase 130 or on the electrical components on the upper surface of the crankcase 130.

Although the example of the intake pressure and crankcase internal pressure sensor has been described, it can be similarly applied to other pressure sensors such as a hydraulic pressure sensor and a water pressure sensor when applicable, and a temperature sensor when applicable. In any case, the various sensors can be modularized and configured compactly.
Moreover, although the application example of the motorcycle has been described in the above embodiment, the present invention is not limited to this and can be effectively applied to a vehicle such as an ATV.

DESCRIPTION OF SYMBOLS 10 Pressure sensor module, 11 Crankcase internal pressure sensor, 12 Intake pressure sensor, 13 Pressure detection port, 14 Pressure detection hose, 15 Pressure detection port, 16 Pressure detection hose, 17 Stay, 100 Motorcycle, 116 Engine unit, 119 Fuel tank , 130 Crankcase, 131 Cylinder, 132 Cylinder head, 133 Cylinder head cover, 135 Air cleaner, 137 Crankshaft, 139 Piston, 140 Connecting rod, 142 Intake port, 143 Exhaust port, 144 Throttle body, 145 Transmission case, 146 Countershaft, 147 Drive shaft, 153 Breather room.

Claims (7)

In an engine having a cylinder head, an intake pipe, and a crankcase made up of a crank chamber and a mission chamber located behind the crank chamber, a pressure for disposing one or more pressure sensors for detecting the pressure inside the engine A sensor arrangement structure,
The pressure sensor arrangement structure for an engine unit, wherein the pressure sensor is arranged above the mission chamber so as to overlap the mission chamber in a top view.   2. The pressure sensor arrangement structure of an engine unit according to claim 1, wherein the pressure sensor is connected by a pressure detection hose extending upward from a pressure detection port provided on a wall surface of a predetermined part of the engine. .   3. The engine unit pressure sensor arrangement structure according to claim 1, wherein the pressure sensor is a crankcase internal pressure sensor that detects a pressure in the crank chamber.   3. The engine unit pressure sensor arrangement structure according to claim 1, wherein the pressure sensor is an intake pressure sensor that detects a pressure in the intake pipe.   The pressure sensor includes a crankcase internal pressure sensor for detecting the pressure in the crank chamber and an intake pressure sensor for detecting the pressure in the intake pipe, and the crankcase internal pressure sensor and the intake pressure sensor are integrally configured as module parts. The pressure sensor arrangement structure for an engine unit according to claim 1 or 2, wherein the pressure sensor is arranged.   6. The engine unit pressure sensor arrangement structure according to claim 3, wherein the crankcase internal pressure sensor is connected to the pressure detection hose led out from the downstream of the breather chamber.   The pressure sensor arrangement structure of an engine unit according to any one of claims 1 to 6, wherein the pressure sensor is fixed integrally with the engine.

Images