JPH0222659Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field This invention relates to a device for measuring the surface temperature of a structural member, in which a sliding member such as a piston ring slides on the surface of a structural member such as a cylinder liner, This device is designed to accurately measure the surface temperature of the friction surface of objects that wear out due to friction.

Prior Art Conventionally, when measuring the surface temperature of this type of structural member, it was impossible to attach the measuring member to the sliding contact surface of the surface, and if the thermal contact was exposed on the surface, the surface would wear out. A problem arises when you do this. Therefore, they are often of the embedded type, but in this case it is not possible to accurately measure the surface temperature, and
It also has the disadvantage of poor responsiveness.

Purpose of the invention This invention aims to solve the above-mentioned drawbacks of the conventional technology.It has good thermal conductivity and a temperature-sensitive member with a hardness equal to or lower than that of the structural members. The temperature-sensitive member is worn out at the same time as the member is worn, so that the heat conductive material is always exposed on the surface of the structural member, so that the surface temperature can be measured accurately.

Structure of the Device In order to achieve the above object, this device is a device for measuring the surface temperature of a structural member in a sliding contact area with a sliding surface. A hole is provided, and a temperature-sensitive member having a thinner rectangular shape that has better thermal conductivity than the structural member, has a hardness equal to or lower than the structural member, and is attached to the hole, and the tip of the temperature-sensitive member is inserted into the hole. The thermocouple is placed in the opening and is exposed to the sliding surface of the structural member, and is attached with one side of the pair of thermocouples in contact with both sides of the temperature-sensitive member, and the other side is insulated. The present invention provides a surface temperature measuring device for a structural member, characterized in that the device is embedded together with the temperature-sensitive member into a hole of the structural member through a material.

Embodiments Hereinafter, a diesel engine cylinder liner surface temperature measuring device of this invention shown in the drawings will be described in detail.

A piston ring (not shown) that is a sliding contact member is placed at the location where the surface temperature of the cylinder liner 1 is to be measured.
The temperature measuring device mounting hole 2 is formed to penetrate in the radial direction from the surface S that comes into sliding contact with the outer circumferential surface. The mounting hole 2 has a step-like shape consisting of a small diameter hole 2a with a circular cross section that opens on the surface S side, and a large diameter hole 2b that communicates with the outer end of the small diameter hole 2a and opens on the outer peripheral surface of the cylinder liner. There is.

A temperature measuring device 3 as shown in the figure is inserted into the mounting hole 2, and a nut 5 is screwed into a threaded portion 4a carved on the outer periphery of the housing 4 of the device 3, and then tightened and fixed to the cylinder liner 1. ing. In the device 3, an inner small diameter portion 14a of a main body 14 made of Fc, which has better thermal conductivity than the cylinder liner 1, is fitted into the small diameter hole 2a of the mounting hole 2. The small diameter portion 14a is recessed with a narrow temperature sensing portion embedding groove portion 14b having an open end surface and a circumferentially long rectangular cross section.
In b, there is a thin rectangular shape (in the figure, width l ₁ 0.5 mm, height 3 mm,
3 mm wide) and the wide surface 6a of the temperature sensing member 6.
The inner surfaces of the thermocouples 7, 7 are placed in contact with each other in the center of both sides of the thermocouples 7, 7, and an insulating material is placed so as to wrap the outer surfaces, top surfaces, and side surfaces of the thermocouples 7, 7, and abut against the side surfaces of the temperature-sensitive member 6. 8,8 are arranged and embedded. The temperature sensing member 6
The distal end surface 6b is located at the opening surface of the attachment hole 2, and is disposed continuously with the inner circumferential surface of the liner 1. The outer end surface of the temperature-sensitive member 6, the outer part of the thermocouple, and the outer part of the insulating material 8 are fixed together with an inorganic adhesive 9.
The temperature sensing member 6 is made of a material that has better thermal conductivity than the cylinder liner 1 and has a hardness equal to or lower than that of the cylinder liner 1, such as Ag, Mg, and Al, and both circumferential sides 6c and 6d thereof are small diameter holes. The surface 6b abuts against the circumferential inner surface of the liner 2a, and the surface 6b wears simultaneously with the wear of the surface of the liner 1, so that it always faces the surface of the liner 1.

A hole 14c having a small diameter in cross section is formed in the small diameter portion 14a continuously to the outer end of the groove portion 14b, and a metal sheath 10 connected to the outer end of the inorganic adhesive 9 is fitted into the hole 14c. The thermocouple 7 is connected to a thermocouple wire 12 inserted into the sheath 10 via an insulating material 11. The metal sheath 10 is connected to a conductive material (not shown) in the large diameter portion 14d of the main body 14 that fits into the large diameter hole 2b of the mounting hole 2, and the cord 15 connected to the conductive material is connected to the housing 4. It is guided outward from the liner 1 through the inside and connected to a device (not shown) that electrically measures and displays the temperature. In the above temperature measuring device, the temperature sensing member 6 is always exposed on the surface of the liner 1, and the temperature sensing member 6 is in contact with the inner surface of the small diameter hole 2a provided on the surface of the liner 1. Surface temperature can be measured accurately and with good responsiveness. Furthermore, even when the liner 1 wears out, the temperature-sensitive member 6 also wears out at the same time, so there is no problem caused by wear such as only the temperature-sensitive member protruding, and the surface of the liner 1 and the surface of the temperature-sensitive member 6 are always connected. As a result, the surface temperature of the liner 1 can be accurately measured, and the amount of wear on the liner 1 can be measured from the measured temperature. That is, as shown in FIG. 4, the temperature decreases as shown in the figure from the surface (inner diameter surface) to the outer surface (outer diameter surface) of the liner 1, and the surface temperature measurement results indicate that the surface temperature decreases as shown in the figure. The amount of wear can be monitored, and abnormal wear can be detected immediately if the surface temperature suddenly drops.

It should be noted that this invention is not limited to the above-mentioned embodiments, and the seventh embodiment
As shown in FIGS. 8 and 9, the temperature sensing member 6'
It is also possible to make only one portion protrude from the main body 14'. That is, the mounting hole 2' provided in the cylinder liner 1' communicates with the outer end of the small hole 2'c, which is narrow and long in the circumferential direction and has a rectangular cross section and is open on the surface S side. The cylinder liner has a stepped shape including a small diameter hole 2'a having a circular cross section and a large diameter hole 2'b communicating with the outer end of the small diameter hole 2'a and opening on the outer peripheral surface of the cylinder liner.

A temperature measuring device 3' as shown in the figure is fitted into the mounting hole 2', and the device 3 has a thin rectangular shape at its tip to be embedded in the small hole 2'c of the mounting hole 2'. (In the figure, width l ₁ 0.5 mm, length 3 mm, width 3 mm) Temperature sensing member 6'
The inner surfaces of the thermocouples 7', 7' are placed in contact with the central portions of both sides of the wide surface 6'a of the temperature sensing member 6', and the outer, upper and side surfaces of the thermocouples 7', 7' Insulating materials 8', 8' are placed so as to enclose the temperature-sensitive member 6' and abut against the side surface of the temperature-sensitive member 6'. The distal end surface 6'b of the temperature sensing member 6' is located at the opening surface of the mounting hole 2, and is disposed continuously with the inner circumferential surface of the liner 1, and is connected to the thermocouple 7'. The insulating material 8' that wraps the tip of the temperature-sensitive member 6' is
It is arranged to extend toward the outer end from an outer position (lower position in the figure) that is a certain distance apart. Since the other configurations are the same as those of the previous embodiment, the explanation will be omitted.

In the case of the above embodiment, the entire upper part of the temperature sensing member 6' is in contact with the cylinder liner, increasing the heat transfer area and improving heat conduction.

Effects As is clear from the above explanation, the device for measuring the surface temperature of a structural member according to this invention can accurately and quickly measure the surface temperature of a structural member that wears out due to friction with a sliding member. Surface wear conditions can be continuously monitored based on temperature, and abnormal wear can be detected immediately. Moreover, since the structure is extremely simple and the number of parts is small, it has the advantage of being inexpensive and easy to implement.

[Brief explanation of the drawing]

Figure 1 is a sectional view showing an embodiment of this invention, Figure 2 is a sectional view showing an embodiment of this invention.
The figure is a - line sectional view of Fig. 1, Fig. 3 is a sectional view of the main part of Fig. 1, Fig. 4 is a - line sectional view of Fig. 3,
Fig. 5 is a perspective view of the main part, Fig. 6 is a temperature distribution diagram of the cylinder liner, Fig. 7 is a sectional view showing a modification of this invention, Fig. 8 is a sectional view of the main part of Fig. 7, and Fig. 9 7 is a perspective view of the main part of FIG. 7. FIG. 1...Cylinder liner, 2...Mounting hole, 2a...
...Small hole, 6...Temperature-sensitive member, 7...Thermocouple, 8...
…Insulating material.

Claims (1)

[Claims for Utility Model Registration] A device for measuring the surface temperature of a structural member in a sliding contact area, which includes a small hole at the location where the surface temperature of the sliding surface is to be measured. Inside,
A temperature-sensitive member having better thermal conductivity than the above-mentioned structural member, having the same or lower hardness, and having a thin rectangular shape is attached, and the tip of the temperature-sensitive member is placed in the hole opening. One side of a pair of thermocouples is exposed on the sliding surface and is attached to both sides of the temperature-sensitive member in contact with the other side of the thermocouple, and the other side of the thermocouple is attached to the above-mentioned thermocouple through an insulating material. A surface temperature measuring device for a structural member, characterized in that the device is embedded together with the temperature-sensitive member in a hole in the structural member.