KR20040084713A - Internal combustion engine - Google Patents

Abstract

PURPOSE: An internal combustion engine is provided to protect a sensor for detecting operation of the internal combustion engine, to improve the durability, to reduce the weight, and to install easily by cooling the sensor and the internal combustion engine efficiently with the sensor cover. CONSTITUTION: A sensor cover(140) is installed in a cylinder(74) to protect a temperature sensor(132) detecting temperature of oil, and composed of an iron rod member(142), a steel sheet member(144) and a steel sheet mounting plate(146). The sensor cover is retained to the side of the cylinder by the steel sheet mounting plate and a mounting boss(170) formed at the side of the cylinder. The L-shaped steel sheet member is bent and extended from the front to the rear part of the cylinder. The mounting plate of the cylinder is formed between cooling fins formed at the side of the cylinder, and the sensor cover mounting part is formed corresponding to the shape of the cooling fin.

Description

Internal combustion engine {INTERNAL COMBUSTION ENGINE}

The present invention relates to an internal combustion engine having a sensor for detecting an operating state of the internal combustion engine at a lower portion of the internal combustion engine disposed substantially horizontally.

Background Art Conventionally, various sensors are mounted on motorcycles (motorcycles, motorcycles with a prime mover) or an automobile tricycle. For example, a transmission (transmission) is equipped with a position sensor which detects the position of the to-be-detected shaft which rotates according to the change of this shift stage, in order to detect a shift stage (patent document 1).

And this patent document 1 discloses providing a sensor cover in order to prevent this position sensor from being damaged by the collision of gravel.

On the other hand, in order to detect the temperature of an internal combustion engine, the structure which provided the temperature sensor in the oil return passage which returns oil from a cylinder head to an oil pan or an oil tank is known (patent document 2).

[Patent Document l] Japanese Unexamined Patent Publication No. 10-324171 (paragraph [0011])

[Patent Document 2] Japanese Unexamined Patent Publication No. 2000-213326 (Scope of Claim)

However, conventionally, there is no configuration in which a cover for protecting the temperature sensor from gravel or the like is provided in the internal combustion engine. In motorcycles and tricycles, the internal combustion engine is exposed to the outside as it is, to achieve cooling and to reduce weight. Therefore, the temperature sensor provided in the oil return passage is also exposed to the outside, which may cause gravel or the like to collide with the temperature sensor during travel.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and can protect a sensor that detects an operating state of an internal combustion engine, and is equipped with both ease of mounting and durability, and is light in weight. It is an object of the present invention to provide an internal combustion engine having a cover capable of efficiently cooling the gas.

In order to solve the said subject, the internal combustion engine provided with the sensor which detects the operation state of the internal combustion engine in the lower part of the internal combustion engine arrange | positioned substantially horizontally, The sensor cover which has a sensor cover for protecting the sensor, Is maintained at both sides of the cylinder constituting the internal combustion engine (invention described in claim 1).

According to the present invention, since the sensor is protected by the sensor cover and the sensor cover is held at both sides of the cylinder, even if an excessive load is applied to the sensor cover due to the collision of gravel or the like while driving, Since the force to rotate in the front-back direction is applied to the whole sensor cover, this becomes a cushion, and it can avoid concentration of the load to the site where the gravel etc. collided. That is, the durability of the sensor cover is improved, and as a result, the sensor can be protected.

In this case, if the sensor cover is composed of a plate-shaped member which is bent in a substantially L shape in a direction from the front of the cylinder to the rear, and a rod-shaped member supporting the plate-shaped member (invention according to claim 2), The sensor cover has sufficient durability. In other words, the durability of the sensor cover is maintained even if the thickness of the plate member is thin to some extent, so that the sensor cover itself can be made lightweight.

Further, even if there is a slight variation in the thickness of each portion of the plate-shaped member, as described above, since the plate-shaped member is supported by the rod-shaped member, sufficient durability can be obtained as the sensor cover. That is, since the plate-shaped member does not necessarily have to be high precision, it can be manufactured easily and inexpensively.

Moreover, since the said plate-shaped member is bent toward the back from the front of a cylinder, and is bent in substantially L shape, the front and the bottom of a cylinder are covered and the side and the back are opened. That is, since the front and the bottom with the highest possibility of collision of gravel or the like are covered, the sensor is protected. On the other hand, since the side and the rear are opened, the area of the wind received by the running in contact with the cylinder and the sensor becomes large, so that both can be cooled appropriately.

Further, it is preferable that the mounting portion on the cylinder side is formed between the cooling fins formed on the side of the cylinder, while the shape of at least a part of the mounting portion on the sensor cover side is formed corresponding to the shape between the cooling fins (claims). 3 invention of description). By configuring in this way, since the mounting part of the said sensor cover side is pinched and positioned by a cooling fin, rotation of a sensor cover can be prevented. Therefore, for example, when fixing the cylinder and the sensor cover with bolts, only one point needs to be fixed on each side, so that the number of bolts can be reduced and the mounting work to the internal combustion engine is also easy.

Furthermore, in order to fix each of the mounting portions with bolts, if the screw insertion shaft of each bolt is made substantially perpendicular to the front-back direction of the cylinder, and the screw insertion shaft is set to be coaxial (invention according to claim 4), Since the load due to the collision of gravel or the like is applied almost equally to the bolt fastening portions at both ends of the cylinder, the torsion of the bolt can be avoided and the durability of the cylinder can be improved.

If a cutout is provided at at least one end of the bent portion of the plate-shaped member (invention according to claim 5), the wind received by traveling is rolled into the cutout and flows into the sensor cover to directly direct the sensor. It can be cooled. In addition, even when the internal combustion engine is covered with a cowl, by providing this cutout, a space can be secured between the sensor cover and the cowl, so that the flow of wind received at the time of travel is sufficiently secured. This makes it possible to cool the sensor and the cylinder efficiently.

If the sensor cover is made of metal (invention according to claim 6), heat from the internal combustion engine can be transferred to the sensor cover side. Therefore, heat is released from the surface of the sensor cover by the heat radiation effect, and the internal combustion engine can be cooled appropriately.

BRIEF DESCRIPTION OF THE DRAWINGS It is a side view explaining the whole structure of the motorcycle of one Embodiment of this invention.

FIG. 2 is a side view of the internal combustion engine configuring the motorcycle shown in FIG. 1. FIG.

3 is a front view of the internal combustion engine shown in FIG. 2 as seen from the cylinder head side.

4 is an exploded perspective view for explaining the configuration of the sensor cover shown in FIG. 3 and the connection relationship between the sensor cover and the cylinder.

FIG. 5 is a bottom view of the plate member shown in FIG. 4. FIG.

FIG. 6 is a perspective view illustrating a state in which the sensor cover shown in FIG. 3 is held on the side of a cylinder. FIG.

<Explanation of symbols for the main parts of the drawings>

10: motorcycle 30: internal combustion engine

58: under cover 74: cylinder

130: oil return passage 132: temperature sensor

l 40: sensor cover 142: rod-shaped member

144: plate-like member 146: mounting plate

154: bend 156: cutout

160: tip 161: cooling fin

170: mounting boss 172: screw insertion hole

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of this invention is described in detail below with reference to attached drawing which illustrates a motorcycle.

FIG. 1: is a side view explaining the whole structure of the motorcycle 10 to which one Embodiment of this invention was applied. The motorcycle 10 has a vehicle body frame 12 serving as a skeleton, and the vehicle body frame 12 is formed by combining the front frame 14 and the rear frame 16.

The front frame 14 is composed of a head pipe 18 and a main pipe 20 extending downward from the head pipe 18 downwardly. The head fork 18 is rotatably supported by the front fork 24 which rotatably supported the front wheels 22 at the lower end, and the handle 26 is fixed to the upper end of the front fork 24. At the lower end of the main pipe 20, an air-cooled internal combustion engine 30 is suspended and arranged approximately horizontally. The internal combustion engine 30 will be described later.

The rear frame 16 is comprised from the rear pipe 32 and the seat rail 34 connected to this rear pipe 32. As shown in FIG. The seat 36 is provided on the seat rail 34 for the occupant to sit on.

The swing arm 40 is supported by the rear part of the internal combustion engine 30 so that the swing arm 40 can swing up and down, and the rear wheel 42 is supported by the rear end part of this swing arm 40 freely, and the swing arm 40 is supported. The rear cushion 44 is connected between and the rear wheel 42.

By the way, the side of the main pipe 20 constituting the front frame 14 is covered by the main pipe side cover 50. Leg shields 52 covering the leg portions of the passengers are detachably attached to both sides of the main pipe side cover 50, and a front top cover 54 is provided at the front of the main pipe side cover 50, and the main The main pipe top cover 56 is provided at the rear of the pipe side cover 50. In addition, an under cover 58 (also called a cowl) covering the internal combustion engine 30 is provided below the main pipe side cover 50. In this case, the opening part 60 which supplies the wind at the time of running to the said internal combustion engine 30 is formed in the front part of the undercover 58. As shown in FIG.

Here, the internal combustion engine 30 will be described. As shown in FIG. 2, the internal combustion engine 30 is basically configured with a crankcase 72, a cylinder 74, a cylinder head 76, and a lubrication system (not shown).

The crankcase 72 accommodates a crankshaft 80 and an oil pump 82 supported in the vehicle body left and right directions, and an oil pan (not shown) for storing oil in the bottom of the crankcase 72. Is formed. In this case, the oil pan may be an oil tank.

A cylinder liner 90 is formed inside the cylinder 74, and the piston 92 is slidably engaged with the cylinder liner 90. The piston 92 is connected to the crankshaft 80 via the connecting rod 94.

A moving valve chamber (not shown) is formed inside the cylinder head 76, and the moving valve mechanism 100 is accommodated in the moving valve chamber. The moving valve mechanism 100 is supported by a cam shaft 102 that is freely supported by a cylinder head 76, an intake cam and an exhaust cam integrally formed with the cam shaft 102, and an intake rocker arm shaft that is supported by the intake cam. An intake rocker arm in contact with the exhaust rocker arm; an exhaust rocker arm supported by the exhaust rocker arm shaft in contact with the exhaust cam; an intake valve 104 driven by the intake rocker arm; It consists of.

In addition, a timing chain (not shown) is wound around the crankshaft 80 and the camshaft 102.

The lubrication system includes an oil supply passage (not shown) for supplying oil to the cylinder head 76 from the oil pan formed in the crankcase 72, and an oil return for returning oil from the cylinder head 76 to the oil pan. A passage 130 (see FIG. 3) and the oil pump 82 housed in the crankcase 72. The oil return passage 130 is formed in the cylinder 74 so as to connect the oil pan of the crankcase 72 and the moving valve chamber of the cylinder head 76.

In the lower part of the cylinder 74, as shown in FIG.2 and FIG.3, the temperature sensor 132 which communicates with the oil return passage 130 and detects the temperature of the oil which is a kind of operation state of an engine is provided, The cylinder cover 74 is equipped with a sensor cover 140 for protecting the temperature sensor 132.

3 and 4, the sensor cover 140 includes a steel rod-like member 142, a steel plate-like member 144, and a steel plate mounting plate 146 (mounting portion). It consists of.

As shown in FIG. 4, the rod-shaped member 142 is bent and formed in four places of bends A-D. The plate-shaped member 144 is joined to the U-shaped portion 148 partitioned into the bent portions A to C, and a muffler 152 to the lower portion of the straight portion 150 partitioned between the curved portions C and D (see FIG. 3). Auxiliary equipment such as

In this case, the positions of the bends A to D are determined in consideration of the size and arrangement of the temperature sensor l32, the width of the cylinder 74, or the layout of auxiliary equipment such as the muffler 152. According to the shape of, the lower space of the cylinder 74 can be widened, which is suitable.

In addition, the mounting plate 146 is bonded to both ends of the rod-shaped member 142. In this case, joining the rod-shaped member 142, the plate-shaped member 144 and the mounting plate 146 by welding increases the strength and is suitable.

The plate member 144 is bent from the front of the cylinder 74 to the rear in the bent portion 154 and is bent in a substantially L shape. A cutout 156 (see FIG. 5) is formed at one end of the bent portion 154.

The mounting plate 146 is formed with an insertion hole 158 into which the bolt 157 for holding and fixing the sensor cover 140 to the cylinder 74 is formed, and at the same time, the front end portion 160 of the mounting plate 146 is formed. The shape corresponds to the shape between the cooling fins 161 formed on the side of the cylinder 74. That is, in the present embodiment, as understood in FIGS. 2 and 4, since the cooling fins 161 are provided in substantially parallel, the shape of the tip portion 160 also corresponds to this, and the side portions are substantially parallel. It becomes the formed plate-shaped member.

On the other hand, as shown in FIG. 4, a part of the cooling fin 161 formed in the side part of the cylinder 74 is cut | disconnected according to the shape of the said mounting plate 146. As shown in FIG. In this cutout part, mounting bosses 170 and 170 (mounting part) for mounting the mounting plate 146 are formed integrally with the cylinder 74. Each of the mounting bosses 170 and 170 is embedded in the cylinder 74 rather than the crown portion of the cooling fin 161, and the bolt (approximately the center portion of each of the mounting bosses 170 and 170 is formed). A screw insertion hole 172 (screw insertion shaft) to which the 157 is screwed is formed. In this case, each screw insertion hole 172, 172 is formed substantially perpendicular to the front-back direction of the cylinder 74, and it is set so that each screw insertion hole 172, 172 may be coaxial.

That is, as understood in FIGS. 4 and 6, the sensor cover l40 has a cooling fin (at the side of the cylinder 74) through the mounting plates 146 and 146 and the mounting bosses 170 and 170. 161 is mounted. As a result, the temperature sensor 132 is disposed in the inner space of the plate-shaped member 144 formed by the bent portion 54. That is, the vertical portion of the plate-shaped member 144 constituting the sensor cover 140 faces the front of the motorcycle 10, and the horizontal portion of the plate-shaped member 144 replaces the road surface with the temperature sensor 132. Protect. In addition, both side surfaces of the plate-like member l44 are opened to allow circulation of the atmosphere.

The motorcycle 10 including the internal combustion engine 30 of this embodiment is comprised as mentioned above fundamentally, Next, the operation | movement is demonstrated.

When the internal combustion engine 30 is started by the rider's starting operation, the crankshaft 80 accommodated in the crankcase 72 rotates. The rotational force of this crankshaft 80 is transmitted through a gear (not shown), and the oil pump 82 is driven. As a result, the oil pumped up from the oil pan under the operation of the oil pump 82 is supplied to the moving valve chamber of the cylinder head 76 through the oil supply passage, so that the moving valve mechanism 100 provided therein Lubricate each part.

The oil lubricating the respective parts of the transfer valve mechanism 100 is returned to the oil pan of the crankcase 72 through the oil return passage 130 (see FIG. 3) formed in the cylinder 74. In this case, the temperature of the oil in the oil return passage 130 is detected by the temperature sensor 132. The temperature of the oil detected by the temperature sensor 132 becomes the temperature of the internal combustion engine 30, and is used, for example, for controlling the fuel injection amount from the fuel injection valve.

On the other hand, the internal combustion engine 30 is cooled by the wind by running from the opening 60 formed in the under cover 58.

As described above, according to the present embodiment, since the sensor cover 140 is held on both sides of the cylinder 74, an excessive load is applied to the sensor cover 140 due to the collision of gravel or the like while driving. Even if it is, even if the force to rotate back and forth across the sensor cover 140 is provided, this becomes a cushion and the concentration of the load to the site where the gravel etc. collided can be avoided. That is, the sensor cover 140 is hardly damaged, and as a result, the temperature sensor 132 can be protected.

In this case, since the plate-shaped member 144 constituting the sensor cover 140 is supported by the rod-shaped member 142, the sensor cover 140 has sufficient durability and is damaged by collision of gravel or the like while driving. It becomes difficult to do it. In other words, since the durability as the sensor cover 140 is maintained even if the thickness of the plate-shaped member 144 is somewhat thin, the sensor cover 140 itself can be made lightweight.

In addition, even if there is a slight deviation in the thickness of each portion of the plate-shaped member 144, as described above, the plate-shaped member 144 is supported by the rod-shaped member 142, so that it is sufficient as the sensor cover 140. Durability can be obtained. That is, the plate member 144 does not necessarily have to be high precision, and can be manufactured easily and inexpensively.

In addition, since the plate-shaped member 144 is formed to be bent toward the front of the cylinder 74 to the rear and bent substantially in an L shape, the front and the bottom of the cylinder 74 are covered, and the side and the rear are opened. That is, the temperature sensor 132 is protected because the front and the bottom with the highest possibility of collision of gravel or the like are covered. On the other hand, since the sides and the rear are open, the area of the wind received by the running in contact with the cylinder 74 and the temperature sensor 132 becomes large, so that both can be cooled optimally.

4 and 6, the mounting boss 170 is buried between the cooling fins 161 formed on both sides of the cylinder 74, and the tip 160 of the mounting plate 146 is formed. ) Corresponds to the shape between the cooling fins 161, so that the tip portion 60 is fitted to the cooling fins 161 to be positioned, whereby rotation of the sensor cover 140 is prevented. Therefore, the number of bolts 157 for fixing both can be reduced, and the attachment work to the cylinder 74 of the sensor cover 140 can also be made easy.

In addition, as shown in FIG. 4, the direction of the screw insertion holes l72 and 172 formed in each mounting boss 170 and 170 is made substantially perpendicular to the front-back direction of the cylinder 74, and each screw insertion hole is carried out. Since 172 and 172 are formed coaxially, when gravel etc. collide, the load is substantially equally applied to the bolts 157 at both ends of the cylinder 74. Therefore, the torsion of the bolt l57 is avoided, and the durability of the cylinder 74 can be improved.

4 and 5, because the cutout portion 156 is formed at one end of the bent portion 154 of the plate-like member 144, the wind received by traveling causes the cutout portion 156. ), It flows into the sensor cover 140 and can directly cool the temperature sensor 132. In addition, as shown in FIG. 3, even when the internal combustion engine 30 is covered with the under cover 58, by providing the notch 156, the sensor cover 140 and the under cover 58 are provided. Since a sufficient space can be secured in between, the flow of wind received at the time of travel is ensured, and the temperature sensor 132 and the cylinder 74 can be efficiently cooled by this wind.

In addition, since the rod-shaped member 142, the plate-shaped member 144, and the mounting plate 146 constituting the sensor cover 140 are all made of metal, heat from the internal combustion engine 30 is transferred to the sensor cover ( 140) can be delivered to the side. Therefore, heat is released from the surface of the sensor cover 140 by the heat radiation effect, and the internal combustion engine 30 can be cooled optimally.

In addition, the sensor which detects the operating state of the internal combustion engine 30 is not limited to the temperature sensor 132 which detects the temperature of the oil mentioned above, For example, a water temperature sensor and a knocking sensor are also included. It goes without saying that the sensor cover 140 can protect these sensors in the same way as the temperature sensor 132.

In addition, although the said embodiment is related to a motorcycle, it is not limited to this, It goes without saying that it is applicable also to a motorcycle, for example.

As mentioned above, according to this invention, the sensor which detects the operating state of an internal combustion engine can be protected.

In addition, the sensor cover is high in durability and light in weight, and is easy to attach to the internal combustion engine, and further, the sensor and the internal combustion engine can be cooled efficiently.

Claims (7)

In the internal combustion engine having a sensor for detecting the operating state of the internal combustion engine in the lower portion of the internal combustion engine arranged approximately horizontally, An internal combustion engine having a sensor cover for protecting the sensor and holding the sensor cover at both sides of a cylinder constituting the internal combustion engine. The method of claim 1, And the sensor cover includes a plate-shaped member which is bent in front of the cylinder from the front to the rear and is bent in an approximately L shape, and a rod-shaped member which supports the plate-shaped member. The method of claim 2, An internal combustion engine, wherein the mounting portion on the cylinder side is formed between the cooling fins formed on the side portion of the cylinder, while the shape of at least a part of the mounting portion on the sensor cover side corresponds to the shape between the cooling fins. The method of claim 3, An internal combustion engine, characterized in that the screw insertion shaft of each bolt is substantially perpendicular to the front-back direction of the cylinder, and the screw insertion shaft is set coaxially to fix the mounting portions with bolts. The method according to any one of claims 2 to 4, An internal combustion engine, characterized in that a cutout is provided at at least one end of the bent portion of the plate member. The method according to any one of claims 1 to 4, And the sensor cover is formed of a metal. The method according to any one of claims 1 to 4, An internal combustion engine, wherein a cutout is provided at at least one end of the bent portion of the plate member, and the sensor cover is made of metal.