JPH0711926A - Pressure adjuster for lubrication oil of engine - Google Patents

Abstract

PURPOSE:To prevent the generation of chattering noise from a pressure adjuster. CONSTITUTION:A branch passage 16 is arranged to the pressfeeding passage 6 of lubrication oil of an engine. A valve seat 19 and a valve chamber 20 are formed in order in the branch passage 16 and a ball valve body 22 inserted in the valve chamber 20 is elasticeally pressed to the valve seat 19 closingly by a coil spring 23. A spring receiver 25 is arranged between the end wall 20a of the valve chamber 20 and the coil spring 23. The vibration of the coil spring 23 in the radial direction is rgulated by bringing the projection part 25a of the spring receiver 25 in frictional contact with the inner periphery surface of the coil spring 23.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for adjusting the pressure of lubricating oil for an engine and is a technique for preventing chattering noise from being generated from a valve body.

[0002]

2. Description of the Related Art In this type of pressure adjusting device,
The one shown in FIG. 5 is known. This is provided with a branch passage 16 in the lubricating oil pressure feed passage 6 of the engine, and the branch passage 16
A valve seat 19 and a valve chamber 20 are sequentially formed in the valve seat 22, and a valve body 22 inserted in the valve chamber 20 is closed and elastically pressed against the valve seat 19 by a coil spring 23.

[0003]

In the pressure adjusting device having the above-mentioned conventional structure, when the engine is in a specific operating state such as a cold state (for example, when the temperature of the lubricating oil is up to 50 ° C),
There was a problem that chattering sound was generated. This chattering sound is considered to be caused by the following causes.

That is, when the engine is in operation, the pressure feed line 6 is affected by the pulsation of the oil pump and the temperature change of the lubricating oil.
The oil pressure inside fluctuates. When the pressure rises above the set value, the valve body 22 opens against the elastic force of the coil spring 23 (see the chain double-dashed line diagram), and the increased pressure is divided by the branch path 1
Escape from 6. When this release causes the pressure in the pressure feeding path 6 to fall below the set value, the coil spring 23 closes the valve body 22 (see the solid line diagram). Then, the pressure in the pressure feeding path 6 rises again, and the valve body 22 is opened. The valve body 22 repeats the above-mentioned opening / closing operation until the pressure in the pressure feeding path 6 stabilizes at a state lower than the set value.

During the above-mentioned opening / closing operation, the valve body 22 and the valve seat 1 are
The flow direction of the lubricating oil that escapes through the valve opening gap between the valve 9 and 9 periodically fluctuates. Due to the periodic fluctuation, the valve body 22 is periodically pressed in the radial direction of the valve chamber 20, so that the coil spring 23 easily resonates in the radial direction. As a result, the valve body 22 vibrates violently in the radial direction while repeating the opening / closing operation, and repeatedly collides with the peripheral wall 21 of the valve chamber 20 to generate chattering noise. An object of the present invention is to prevent chattering noise of a pressure adjusting device.

[0006]

In order to achieve the above object, the present invention provides a pressure adjusting device as follows, for example, as shown in FIG. 1 and FIG. 2, or FIG. 3 or FIG. Configured to. A branch passage 16 is provided in the lubricating oil pressure feed passage 6 of the engine 1, a valve seat 19 and a valve chamber 20 are sequentially formed in the branch passage 16, and a valve body 22 is inserted into the valve chamber 20 and the valve body 22 is inserted. Coil spring 23 for closing and elastically closing the valve seat 19 above
The coil spring 2 is provided between one end of the coil spring 23 and the other end of the coil spring 23.
3 is provided with a restraint portion A that restricts the movement of the valve chamber 3 in the radial direction of the valve chamber 20.

[0007]

The present invention operates as follows, for example, as shown in FIG. During the opening / closing operation of the valve body 22, the flow direction of the lubricating oil released through the valve opening gap between the valve body 22 and the valve seat 19 periodically fluctuates. It is vibrated periodically in the radial direction of 20. However, since the restraint A restricts the radial movement of the coil spring 23, the vibration of the valve body 22 described above is gradually attenuated. As a result, it is possible to prevent the valve body 22 from colliding violently with the peripheral wall 21 of the valve chamber 20, and it is possible to prevent the chattering noise from being generated due to the collision.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a vertical sectional view of a pressure adjusting device. Figure 2
[Fig. 4] is a lubrication system diagram of an engine provided with the above pressure adjusting device.

As shown in FIG. 2, a diesel engine 1
An oil pan 3 is provided below the engine body 2.
The lubricating oil L stored in the oil pan 3 is supplied to a lubricating oil pressure feed passage 6 by an oil pump 5 via a strainer 4, and from the pressure feed passage 6, a gear mechanism 7, a crank shaft 8, a fuel injection cam shaft 9 ,. It is sent to the valve operating camshaft 10. Reference numeral 12 is a piston, reference numeral 13 is a valve mechanism, and reference numeral 14 is a fuel injection pump. A relief branch passage 16 is provided at the starting end of the lubricating oil pressure feed passage 6, and a relief 17 valve is provided in the branch passage 16.

As shown in FIG. 1, the relief valve 17 is constructed as follows. The branch passage 16 is formed in a part of the engine body 2, and the valve seat 19 and the valve chamber 20 are sequentially formed in the branch passage 16 from the upstream side. The valve seat 19 has a sleeve 21 that forms a peripheral wall of the valve chamber 20.
It is provided on the left side of the cylindrical hole. The sleeve 21
The ball valve body 22 is inserted into the cylindrical hole of the ball valve body 22, and the ball valve body 22 is elastically closed by the coil spring 23 against the valve seat 19.

Further, the right end portion 23 of the coil spring 23 is
A spring receiver 25 is provided between a and the end wall 20a of the valve chamber 20. The protruding portion 25 of the spring receiver 25
a is fitted in the coil spring 23, and the spring 23
Is configured as a restraint portion A for restricting the movement of the valve chamber 20 in the radial direction of the valve chamber 20. That is, the spring 23 is restricted from vibrating in the radial direction of the valve chamber 20 due to the frictional force applied from the outer peripheral surface of the projecting portion 25 a to the inner peripheral surface of the coil spring 23.

3 and 4 each show a modified example, in which members having the same configurations as those of the above-mentioned embodiment are designated by the same reference numerals.

In the modification of FIG. 3, another coil spring 27 is inserted in the coil spring 23, and these two springs 2 are
A sleeve 28, which is the restraint portion A, is fitted between 3 and 27. The elastic force of the other coil spring 27 is transmitted to the ball valve body 22 via the sleeve 28. The elastic pressures of the two springs 23 and 27 are selected so as to be a relief setting pressure when the sleeve 28 contacts the end wall 20a of the valve chamber 20.

In the modification of FIG. 4, the left end portion 23b of the coil spring 23 is fixed to the peripheral surface of the ball valve body 22 by welding. The welded portion constitutes the restraint portion A.
This restricts the coil spring 23 from vibrating in the radial direction. In addition, in the above-described embodiments and modifications, the valve body 22 does not have to be ball-shaped.

[0015]

According to the present invention, even if the valve body vibrates due to periodic fluctuations in the flow direction of the lubricating oil or the like, the coil spring can be restricted from vibrating in the radial direction by the restraint portion. The vibration of the body is gradually attenuated. Therefore, the valve body is suppressed from colliding with the peripheral wall of the valve chamber violently, and chattering noise due to the collision is prevented.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of an embodiment of a pressure adjusting device.

FIG. 2 is a lubrication system diagram of an engine provided with the pressure adjusting device.

FIG. 3 is a diagram showing a modified example and corresponding to FIG. 1 described above.

FIG. 4 is a partial view showing another modification example and corresponding to FIG. 1 above.

FIG. 5 is a view showing a conventional example and corresponding to FIG. 1 above.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Engine, 6 ... Pumping passage, 16 ... Branch passage, 19 ... Valve seat, 20 ... Valve chamber, 22 ... Valve body, 23 ... Coil spring, A ...
Restraint portion (25a ... Projection portion of spring receiver 25, 28 ... Sleeve).

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Tatsuyuki Nakamura 64 Ishizukita-machi, Sakai City, Osaka Prefecture Kubota Sakai Co., Ltd. (72) Kozo Yoshida 64, Ishizukita-machi, Sakai City, Osaka Prefecture Kubota Sakai Co., Ltd.

Claims (1)

[Claims] 1. A pumping passage (6) for lubricating oil of an engine (1)
A branch passage (16) is provided in the branch passage (16), and a valve seat (19) is provided in the branch passage (16).
And a valve chamber (20) are formed in that order, and the valve body is placed in the valve chamber (20).
(22) is inserted, and a coil spring (23) for closing the valve body (22) to the valve seat (19) is provided.
3) From the one end to the other end of the valve body (22), the coil spring (23) of the coil chamber (20)
A lubricating oil pressure adjusting device for an engine, characterized in that it is provided with a restraining portion (A) for restricting its movement in the radial direction.