JPH06241947A - Abrasion tester for engine valve and valve sheet - Google Patents

Abstract

PURPOSE:To perform abrasion test with an engine valve and a valve sheet in the same atmosphere as a real machine. CONSTITUTION:Since, at the top surface of a sheet holder 17 engaged with the top end of a valve holder 13, a heat insulating cover 26 bearing a tapered bore 26a is provided, a flame 25 jetted toward the surface of umbrella part 19a from a gas burner 24, instead of being diffused into outside, remain in the heat insulating cover 26, so, the umbrella part 19a and a valve sheet 18 are effectively heated in approximately same atmosphere as a real machine. Further, since the flame 25 is positively sucked into the gap formed between the umbrella part 19a and the valve sheet 18 through a flow channel 30 when a sucking means is activated, the engine valve 19 and the valve sheet 18 are, similar to the atmosphere on the exhaust side of the real machine, kept at a high temperature.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to an apparatus for testing the wear condition of engine valves and valve seats.

[0002]

2. Description of the Related Art A wear test of engine valves and valve seats is usually carried out by a bench test using an actual machine (engine). In this test method, the engine is disassembled after each test, They have to be reassembled, and the work is extremely troublesome, and the test efficiency is poor.

Therefore, recently, a wear test has been carried out using a test apparatus which replaces the actual machine test. FIG. 3 shows a conventional wear test device, in which (1) is a rectangular base frame, which is erected on the base plate (2) and at the front, rear, left and right ends thereof (the directions below refer to the drawings). It consists of a column (3) of books and a support plate (4) supported by the upper ends of the columns (3).

A motor (6) is mounted on a base plate (5) fixed to the left side of the upper surface of the base plate (2), and a crankshaft (eccentric shaft) (6a) facing the front-rear direction thereof is The circular lower end of the drive arm (7) is pivotally mounted in the vertical direction.

An intermediate part of a horizontal swing arm (9) is rotatably up and down in a horizontal direction at an intermediate part of a bracket (8) suspended from a central part of a lower surface of the support plate (4). Is pivotally attached to
The upper end of the drive arm (7) is rotatably connected to the left end thereof.

The motor (6), the crankshaft (6a),
The drive arm (7), the swing arm (9) and the like constitute a reciprocating drive means.

An adjusting screw (10) is screwed to the right end of the swing arm (9) so as to face in the vertical direction.

In the holding hole (4a) formed on the axis of the adjusting screw (10) in the support plate (4), the support cylinder (1
The lower end of 1) is press-fitted through a spacer (12) fitted on the outer periphery of the lower end.

A valve holder (13) having a stepped hole (13a) coaxial with the adjusting screw (10) is fitted in the support cylinder (11), and the valve holder (13) is , The outward flange (13b) of the support tube (11) outward flange (11a)
It is prevented from coming off by fastening the bolt (14) to it.

An annular water jacket (15) is formed at the upper end of the support cylinder (11) to circulate cooling water. (16)
Is an O-ring for sealing. A seat holder (17) is fitted on the upper surface of the valve holder (13), and a valve seat (18) as a test piece is press-fitted into a large-diameter fitting hole (17a) formed in the center of the seat holder (17). ing.

Reference numeral (19) is an engine valve which is a test piece, and is assembled in a vertically inverted manner with a valve operating mechanism of a normal engine.

That is, in the engine valve (19) with the umbrella portion (19a) facing upward, the shaft portion (19b) has a valve holder (13).
It is slidably held by the valve guide (20) press-fitted into the small diameter side of the stepped hole (13a), and the valve face portion (19c) formed on the umbrella portion (19a) contacts the valve seat (18). As a result, it is prevented from falling down.

There is a winding diameter between the spring retainer (21) fixed to the lower end of the shaft portion (19b) via a pair of cotters (not shown) and the lower end surface of the valve holder (13). Different size 2
The two valve springs (22) and (23) are contracted, and the elastic force of these springs always urges the engine valve (19) downward.

The lower end of the engine valve (19) is in contact with the upper end of the adjusting screw (10), and the motor (6)
Of the swing arm causes the drive arm (7) to move eccentrically.
When (9) rotates up and down, the engine valve (19) moves up and down by a required stroke.

Reference numeral (24) is a gas burner provided above the umbrella portion (19a). Engine valve (19) and valve seat
When carrying out the wear test of (18), the motor (6) is operated at a rotation speed corresponding to a certain number of revolutions of the engine to move the engine valve (19) up and down, and at the same time, the flame from the gas burner (24) The (25) is radiated toward the umbrella section (19a) to bring the ambient temperature of the peripheral surface thereof close to the temperature in the cylinder of the engine.

After leaving for a predetermined time in this state, the test is stopped and the engine valve (19) and valve seat are removed from the equipment.
(18) is removed, and the wear state of the valve face (19c) and the seating surface of the valve seat (18) with which it abuts is measured.

[0017]

In the conventional wear test apparatus described above, the flame (25) of the gas burner (24) radiated to the umbrella surface of the engine valve (19) is directed outward as indicated by an arrow in the figure. There is a problem that the heat escapes and the heat diffuses to the surroundings, and the valve (19) is not heated effectively.

In addition, the flame (2
Since the amount of 5) is extremely small, in particular, as a wear test of the engine valve (19) and the valve seat (18) on the exhaust side where the combustion gas passes through the exhaust port, since it is significantly different from the combustion atmosphere of the actual machine, Not good.

The present invention has been made in order to solve the above problems, and provides a wear test apparatus capable of performing a wear test of an engine valve and a valve seat in substantially the same atmosphere as an actual machine. Has an aim.

[0020]

In order to achieve the above object, the present invention is directed to axially sliding a shaft portion of an engine valve, which is always biased by a biasing means toward a shaft end, by a valve holder. While holding it freely, the umbrella portion of the engine valve is brought into contact with the valve seat press-fitted into the fitting hole of the valve holder, and the engine valve is reciprocally moved by the reciprocating drive means while the flame is directed toward the surface of the umbrella portion. In an abrasion test device for an engine valve and a valve seat, the valve face portion and the valve seat formed on the umbrella portion are inspected for wear condition by radiating heat. On the end face of the valve holder where the seat is press-fitted, the diameter gradually increases toward the valve seat side, and the inner diameter of the end on the valve seat side is The heat insulating cover comprising a tapered hole that is substantially equal to or larger than the outer diameter of the umbrella portion of the lube is characterized by comprising a contact form.

[0021]

By providing the heat insulating cover having the tapered hole on the end surface of the valve holder, for example, the flame radiated toward the surface of the umbrella portion from the gas burner or the like is not diffused to the outside and is kept in the heat insulating cover. Since it remains, the umbrella portion and the valve seat are effectively heated in an atmosphere similar to that of the actual machine.

Further, when the suction means is operated, the flame is positively sucked through the gap formed between the umbrella portion and the valve seat, so that the engine valve and the valve seat are kept at a high level like the atmosphere on the exhaust side of the actual machine. It can be maintained at temperature.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. It should be noted that the same members as those in the conventional example described above are denoted by the same reference numerals, and detailed description thereof will be omitted.

In FIG. 1, a sheet holder having the same shape as the conventional one
On the upper end face of (17), a plurality of heat insulating covers (26) are provided on the central axis, each of which has a tapered hole (26a) having a C-shaped cross section that gradually increases in diameter toward the lower end (valve seat side). It is fixed tightly with the bolt (27) of.

The inner diameter of the upper end of the tapered hole (26a) and the opening continuous with it is smaller than the outer diameter of the umbrella portion (19a), and the lower end has its inner diameter outside the umbrella portion (19a). The space is larger than the diameter, and the space surrounded by the upper surface of the sheet holder (17) and the umbrella surface serves as a greenhouse (28).

On the peripheral walls of the support cylinder (11), the spacer (12) and the valve holder (13), there are a plurality of connecting holes which are vertically formed around the valve guide (20) of the valve holder (13). A plurality of flow paths (30) communicating with the fitting hole (17a) into which the valve seat (18) is press-fitted and the stepped hole (13a) below the umbrella portion (19a) are formed through the passage (29). There is. A suction pipe (32) connected to the suction device (31) is connected to the outlet end of each flow path (30).

When an abrasion test was carried out using the apparatus of the above-mentioned embodiment, as shown in the enlarged view of FIG. 2, the flame (25) radiated from the burner (24) immediately above the heat insulating cover (26) was exposed to the outside. Since it stays in the greenhouse (28) of the insulation cover (26) without diffusing into the inside, the interior of the greenhouse (28) is kept at the same high temperature as the atmosphere in the cylinder of the actual machine, and the engine valve (19) It is possible to effectively heat the umbrella portion.

At the moment when the umbrella portion (19a) is separated from the valve seat (18), the hot air in the greenhouse (28) flows downward through these gaps, so that the valve seat (18) is also effectively heated. To be done.

The above is the description of the test procedure in the state where the suction device (31) is not operated, and is suitable for the wear test of the engine valve (19) for intake and the valve seat (18) therefor, for example. .

Exhaust engine valve (19) in which high temperature combustion gas passes between the umbrella portion (19a) and the valve seat (18).
During the abrasion test of the valve seat (18) and the valve seat (18) for it, the suction device (31) is always operated during the test.

In this way, the pressure below the umbrella portion (19a) is reduced, so that the hot air in the greenhouse (28) is trapped in the umbrella portion (19a).
The test piece is positively sucked through the gap formed between the valve face portion (19c) and the valve seat (18), and both of the test pieces are kept in a high temperature state as in the actual machine.

As described above, in the above embodiment, the flame (25) of the gas burner (24) can be effectively used only for heating the test piece without letting it escape to the outside. Therefore, the engine valve (19) The wear test of the valve seat (18) and the valve seat (18) can be performed under almost the same conditions as the actual machine, and the reliability of the test data increases.

In the above embodiment, the valve seat (18)
Although the seat holder (17) was press-fitted, the seat holder (17) like this may be abolished and press-fitted into the upper end of the valve holder (13). The means for reciprocally driving the engine valve (19) may be a rotating cam or the like.

[0034]

According to the present invention, the flame can be prevented from escaping to the outside, and the engine valve and the valve seat can be effectively heated. Therefore, a wear test should be performed in an atmosphere substantially similar to the actual machine. This improves the reliability of the test data.

When the suction means is operated to perform the test, the flame is positively sucked through the gap formed between the valve face portion and the valve seat, and both test pieces are maintained at a high temperature. Good results have been obtained as a test of the engine valve and its valve seat.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view showing an embodiment of the present invention.

FIG. 2 is likewise an enlarged vertical sectional front view of a main part.

FIG. 3 is a partially cutaway front view showing a conventional example.

[Explanation of symbols]

(1) Base frame (2) Base plate (3) Post (4) Support plate (4a) Holding hole (5) Base plate (6) Motor (6a) Crankshaft (7) Drive arm (8) Bracket (9) Swing arm (10) Adjust screw (11) Support cylinder (12) Spacer (13) Valve holder (13a) Stepped hole (15) Water jacket (16) O-ring (17) Seat holder (17a) Fitting hole ( 18) Valve seat (19) Engine valve (19a) Head part (19b) Shaft part (19c) Valve face part (20) Valve guide (21) Spring retainer (22) (23) Valve sprinkle (24) Gas burner (25) Flame (26) Heat insulation cover (26a) Tapered hole (28) Greenhouse (29) Communication path (30) Flow path (31) Aspirator (32) Suction tube

Claims (2)

[Claims] 1. A shaft holder of an engine valve, which is constantly urged by an urging means toward an axial end direction, is held by a valve holder so as to be slidable in the axial direction. Formed on the umbrella portion by abutting against the valve seat press-fitted into the fitting hole of the holder and reciprocally moving the engine valve by the reciprocating driving means while radiating and heating the flame toward the surface of the umbrella portion. In an engine valve and valve seat wear test device for inspecting the wear state of the contact surfaces of the valve face portion and the valve seat, the valve seat is attached to the end surface of the valve holder on the side where the valve seat is press-fitted. The inner diameter of the valve seat side end is made to be about the same as or larger than the outer diameter of the engine valve umbrella while gradually increasing the diameter toward the side. The heat insulating cover comprising a chromatography path hole, the engine valves and wear test apparatus of the valve seat, characterized in that provided as an adhesive like. 2. The engine valve and valve according to claim 1, wherein the valve holder is provided with a flow path communicating with the fitting hole into which the valve seat is press fitted, and the flow path is linked to the suction means. Seat abrasion tester.