JPH0220437Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a mounting structure for a temperature sensor in an internal combustion engine.

[Prior Art] For example, in an electronically controlled internal combustion engine, in addition to the amount of depression of an accelerator pedal, the temperature of a coolant or lubricating oil is converted into an electrical signal and input into the electronic control device. Conventionally, temperature sensors that detect the temperature of coolant or lubricating oil are generally embedded in holes in cylinder blocks or attached to bosses provided in the middle of piping.

By the way, even if internal combustion engines have the same basic dimensions, some are equipped with an electronic control device and others are not, so some have a temperature sensor mounting hole in the cylinder block and others do not, and some have different lubricating oil. Alternatively, it is necessary to manage the parts by sorting them into those with temperature sensors attached to the coolant piping and those without, which is a problem in that it is very time-consuming.

[Problems to be solved by the invention] In view of the above-mentioned problems, the purpose of the invention is to provide a temperature sensor that can be easily installed using conventionally used parts, and to eliminate the complicated management of parts as described above. An object of the present invention is to provide a mounting structure for a temperature sensor that solves the problem.

[Means for Solving the Problem] In order to achieve the above object, the structure of the present invention is such that a joint having an annular cavity connected to the end of the coolant pipe is superimposed on the outer wall of the internal combustion engine, and the hollow part is A hollow bolt that communicates with the annular cavity through a radial passage is passed through the joint and screwed into the coolant inlet/outlet of the outer wall, so that the heat-sensitive part protrudes into the hollow part through a screw hole provided in the head of the hollow bolt. A temperature sensor is screwed onto the

[Operation] The present invention uses a hollow bolt to connect an eyeball-shaped joint at the end of a pipe for cooling fluid, etc., to an inlet/outlet that communicates with a water chamber or a lubrication passage provided on the outer wall of an internal combustion engine. Therefore, regardless of whether an electronic control device is installed or not, by selectively attaching a temperature sensor or a screw plug to a common hollow bolt, piping can be connected, simplifying the management of processes and parts. Since lubricating oil lubricates and cools the sliding parts, it acts as a cooling fluid.

[Embodiment of the invention] FIG. 1 is an overall configuration diagram of an internal combustion engine to which the temperature sensor mounting structure of the invention is applied. Attached equipment 25 driven by the engine 26 is mounted on the outer wall of the engine 26,
For example, an air compressor or the like is installed, and in order to cool the cylinder head of the air compressor, cooling fluid is supplied from the engine 26 through piping 12, and is then returned to the engine 26 through piping (not shown). ing.

A known eyeball-like joint having an annular cavity is connected to one end of the pipe 12, and this joint is connected to the engine 26.
It is fixed by a hollow bolt 14 to a screw hole provided in the outer wall of the housing and communicating with a water chamber or a lubricating passage. The other end of the pipe 12 is also connected to an accessory 25 via a joint 5 and a hollow bolt 24 .

As shown in FIG. 2, according to the present invention, the engine 2
A temperature sensor 2 is attached to the hollow bolt 14 to detect the temperature of the coolant 6. A coolant inlet/outlet 18 is provided in the outer wall 10 of the engine and is connected to a water chamber or a lubricating passage. A hollow bolt 14 is screwed into a screw hole 8 formed in a coolant inlet/outlet 18, and a pair of annular seal members 9, 13 are interposed between the head 3 of the hollow bolt 14 and the outer wall 10 to connect the pipe 12 to the joint. 5
is pinched. The pipe 12 is connected to the annular cavity 19 of the joint 5.
It is communicated with a water chamber or a lubricating passage inside the engine through the radial passage 4 of the hollow bolt 14, the hollow part 6, and the coolant inlet/outlet 18.

According to the present invention, the head 3 of the hollow bolt 14 is provided with a screw hole 17 that communicates with the hollow portion 6, and the threaded portion of the temperature sensor 2 is screwed into the screw hole 17 via the sealing member 15. Two heat-sensitive parts 7 are projected into the hollow part 6. A lead wire 16 connected to the heat sensitive section 7 is led out from the head of the temperature sensor 2.

[Effects of the invention] As described above, the present invention overlaps the joint with the annular cavity connected to the end of the coolant pipe on the outer wall of the internal combustion engine, and the hollow part connects to the annular cavity through the radial passage. A communicating hollow bolt is passed through the joint and screwed into the coolant inlet/outlet of the outer wall, and a temperature sensor is screwed into the screw hole provided in the head of the hollow bolt so that the heat-sensitive part protrudes into the hollow part. Because of this, the piping in the engine body can be shared, and the temperature of the coolant flowing from the piping to the engine or from the engine to the piping can be accurately detected.

During the assembly process of an internal combustion engine, depending on whether an electronic control device is installed or not, it is sufficient to attach a temperature sensor or a threaded plug to the common hollow bolt used to connect the piping. Management becomes easier, installation work is simplified, and work efficiency is improved.

[Brief explanation of the drawing]

FIG. 1 is a side view of an internal combustion engine showing the mounting state of a temperature sensor to which the present invention is applied, and FIG. 2 is a side sectional view showing the mounting structure of the temperature sensor. 2: temperature sensor, 3: head, 4: radial passage,
6: Hollow part, 5: Joint, 7: Heat sensitive part, 10: Outer wall, 12: Piping, 14: Hollow bolt, 17: Screw hole, 18: Coolant inlet/outlet, 19: Annular hollow part.

Claims (1)

[Scope of utility model registration request] A joint having an annular cavity connected to the end of the coolant pipe is superimposed on the outer wall of the internal combustion engine, and a hollow bolt is provided, the hollow part communicating with the annular cavity through a radial passage.
Penetrate the joint and screw it into the coolant inlet/outlet on the outer wall,
A temperature sensor is screwed into a screw hole provided in the head of a hollow bolt so that the heat-sensitive part protrudes into the hollow part.
Mounting structure of temperature sensor for internal combustion engine.