JP3391102B2 - Engine cooling piping structure - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling pipe structure for an engine, and more particularly, to a method for protecting a crank angle sensor by using a cooling pipe for circulating cooling water for an engine. The present invention relates to a cooling pipe structure for an engine. 2. Description of the Related Art A vehicle is provided with a radiator for cooling cooling water heated by an engine. The radiator is connected to the other end of an engine water outlet pipe, which is an engine cooling water distribution pipe connected to an engine water outlet cap, which is an engine cooling water outlet cap attached to the engine. To guide the engine to
A so-called cooling pipe to which an engine water inlet pipe, which is another engine cooling water flow pipe connected to the water pump, is provided. Further, some of the upper parts of the engine are provided with a crank angle sensor at one of a front end part and a rear end part. That is, in FIGS. 4 and 5, reference numeral 102 denotes an engine, 104 denotes a cylinder block, 106 denotes a cylinder head, 108 denotes a cylinder head cover, and 110 denotes an oil pan. The cylinder head 106 is provided with a crank angle sensor 112 for detecting a crank angle by rotation of a cam shaft (not shown) at, for example, a rear end portion R. An engine outlet cap 114 for engine coolant is attached to the rear end portion R of the cylinder head 106. An engine outlet pipe (not shown) is connected to the engine outlet cap 114. Therefore, in this engine 102, a cooling pipe is provided at the rear. Further, an exhaust manifold 116 is attached to the cylinder head 106 in the traveling direction of the vehicle when the engine 102 is placed horizontally. Reference numeral 118 denotes a water pump, and F denotes a front end portion of the engine 2. [0004] As such a cooling pipe for an engine, for example, Japanese Utility Model Publication No. 5-17383, Japanese Utility Model Publication No.
It is disclosed in JP-A-13433. 5-173
No. 83 describes a cooling water hose connected to a cover of a thermostat case formed in a cylinder block, which is connected to a first auxiliary device and a second auxiliary device which are vertically arranged adjacent to the front of an exhaust manifold. A part of auxiliary equipment is interposed between the cooling water hose and the exhaust manifold to reduce the amount of heat received from the exhaust manifold to reduce the heat load. Accordingly, radiant heat from the exhaust manifold to the cooling water hose is blocked without using a special heat insulating material. Japanese Utility Model Publication No. Hei 3-13433 discloses that a radiator hose is piped so as to surround a rotary solenoid, and thereby, during driving, fine stones and the like that are jumped up collide with the radiator hose and fall, thereby damaging the rotary solenoid. It is to prevent that. [0005] However, conventionally, in the case of a vehicle having a horizontal engine, a crank angle sensor is disposed at one of a front end portion and a rear end portion of the engine. There is a problem that a broken or broken or the like occurs in the crank angle sensor due to a flying stone or the like during traveling. If the crank angle sensor is to be protected by a protective cover made of aluminum, sheet metal, or the like in order to solve this problem, the number of parts increases and the cost increases. [0007] Further, since the crank angle sensor is provided close to the exhaust manifold, there is an inconvenience that a protective cover such as a heat protector for blocking radiant heat from the exhaust manifold is required. SUMMARY OF THE INVENTION In order to eliminate the above-mentioned disadvantages, the present invention provides an engine in which a crank angle sensor is provided at one of a front end portion and a rear end portion of a vehicle. A radiator for cooling the cooling water heated by the engine is provided, and one end is connected to an engine cooling water outlet cap attached to the engine and the other end is connected to the radiator. In a cooling pipe structure of an engine provided with a pipe, the crank angle sensor and the engine cooling water outlet cap are disposed at a rear end portion of the engine, and the engine cooling water outlet cap and the engine cooling water flow pipe are connected to the vehicle. Is disposed so as to surround the crank angle sensor with respect to the traveling direction of the engine. The engine cooling water flow pipe extends between the exhaust manifold and the exhaust manifold. According to the structure of the present invention, even if there is a stepping stone or the like while the vehicle is running, the stepping stone or the like does not contact the crank angle sensor due to the presence of the cooling pipe, and the radiant heat of the exhaust manifold is reduced. Also, the crank angle sensor can be protected by the cooling pipe because the cooling pipe is also blocked, thereby eliminating the need for a separate protective cover for the crank angle sensor, preventing an increase in the number of parts, and simplifying the configuration. be able to. An embodiment of the present invention will be described below in detail with reference to the drawings. 1 to 3 show an embodiment of the present invention. 1 to 3, reference numeral 2 denotes an engine mounted horizontally on a vehicle (not shown), for example, 4 denotes a cylinder block, 6 denotes a cylinder head, 8 denotes a cylinder head cover, and 10 denotes an oil pan. As shown in FIG. 3, a crankshaft 12 is supported on the cylinder block 4. A crank pulley 14 is attached to an end portion of the crankshaft 12. Further, the engine 2 is provided with a plurality of auxiliary devices, for example, a water pump 16, an oil pump 18, an alternator 20, and a power steering pump 22. The water pump 16, the oil pump 18, the alternator 20, and the power steering pump 22 are driven by a drive belt 24 wound around the crank pulley 14. The drive belt 24 has first and second idlers 26, 2
8 are wound around each. An exhaust manifold 30 is attached to the cylinder head 6 on a side surface in the traveling direction of the vehicle when the engine 2 is mounted horizontally on the vehicle. At the rear end portion R of the cylinder head 6 of the engine 2, there is provided a crank angle sensor 32 for detecting the rotation of a cam shaft (not shown) as a crank angle. An engine outlet cap 34, which is an engine cooling water outlet cap, is attached by a mounting flange 34a. The engine outlet cap 34 has an engine outlet pipe 3 serving as an engine coolant flow pipe.
6 is connected to one end. These engine outlet caps 34
In addition, one end of the engine outlet pipe 36 is disposed so as to be entirely curved so as to surround the crank angle sensor 32 in the traveling direction of the vehicle. The engine outlet pipe 36
Is located between the crank angle sensor 32 and the exhaust manifold 30 and extends to a front end portion F in the traveling direction of the vehicle. A radiator 38 for cooling the cooling water heated by the engine 2 is provided at a front end portion F of the engine 2. The other end of the engine outlet pipe 36 is connected to the upper tank 40 of the radiator 38. The lower tank 42 of the radiator 38 is connected to one end of an engine inlet pipe 44 serving as another engine cooling water flow pipe. The other end of the engine inlet pipe 44 is connected to the water pump 16. A thermo case 46 containing a thermo valve (not shown) is provided between the engine inlet pipe 44 and the water pump 16, that is, between the water pump 16 and the exhaust manifold 30. Note that FIG.
In the figure, reference numeral 48 denotes a cooling fan. Next, the operation of this embodiment will be described. A crank angle sensor 32 and an engine outlet cap 34 are provided at a rear end portion R of the engine 2 so that the engine outlet cap 34 and the engine outlet pipe 36 surround the crank angle sensor 32 with respect to the traveling direction of the vehicle. The engine outlet pipe 36 extends between the crank angle sensor 32 and the exhaust manifold 30. Therefore, the crank angle sensor 32 can be protected by using the cooling pipe of the engine 2 and thereby, In addition, the crank angle sensor 32 is protected by the cooling pipe even if there is a flying stone or the like while the vehicle is traveling, and the radiant heat of the exhaust manifold 30 can be cut off by the cooling pipe. Therefore, a separate protective cover for the crank angle sensor 32 is not required, the number of components can be reduced, the configuration can be simplified, and the cost can be reduced. Further, since the engine outlet pipe 36 extends from the rear end portion R of the engine 2 to the front end portion F, even when the engine 2 is mounted vertically or horizontally on a vehicle, the same cooling pipe is used. Layout is possible, which is practically advantageous. Further, since the thermo case 46 is arranged between the water pump 16 and the exhaust manifold 30,
Even when the engine 2 is placed vertically or horizontally, the cooling pipe on the engine 2 side can be commonly used. As is apparent from the above detailed description, according to the present invention, the crank angle sensor and the engine cooling water outlet cap are provided at the rear end of the engine, and the engine cooling water outlet cap and the engine are provided. A cooling water circulation pipe is arranged to surround the crank angle sensor with respect to the traveling direction of the vehicle,
By extending the engine coolant flow pipe between the crank angle sensor and the exhaust manifold attached to the engine,
Even if there is a stepping stone while the vehicle is running, there is no danger that the stepping stone will hit the crank angle sensor due to the presence of the cooling pipe, and the radiant heat of the exhaust manifold will be cut off by the cooling pipe. It can be protected by a pipe, thereby eliminating the need for a separate protective cover for the crank angle sensor, preventing an increase in the number of parts, simplifying the configuration, and reducing the cost.

[Brief description of the drawings] FIG. 1 is a rear view of an engine. FIG. 2 is a side view of the engine. FIG. 3 is a front view of the engine. FIG. 4 is a side view of a conventional engine. FIG. 5 is a rear view of a conventional engine. [Explanation of symbols] 2 Engine 16 Water pump 30 Exhaust manifold 32 crank angle sensor 34 engine outlet cap 36 Engine outlet pipe 38 Radiator 46 Thermo case

Continuation of the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F01P 11/04 F02B 67/00 F02D 35/00

Claims (1)

Claims: 1. An engine provided with a crank angle sensor at one of a front end portion and a rear end portion mounted on a vehicle, and cooling water heated by the engine. A radiator for cooling the engine, an engine cooling water flow pipe connected at one end to an engine cooling water outlet cap attached to the engine and the other end connected to the radiator. An angle sensor and the engine cooling water outlet cap are disposed at a rear end portion of the engine, and the engine cooling water outlet cap and the engine cooling water flow pipe surround the crank angle sensor with respect to the traveling direction of the vehicle. The engine cooling water flow pipe is disposed between the crank angle sensor and an exhaust manifold attached to the engine. Cooling pipe structure for an engine, characterized in that the set.