GB1595130A

GB1595130A - Strainer for thesuction pipe of a lubricant pump

Info

Publication number: GB1595130A
Application number: GB25764/78A
Authority: GB
Original assignee: Bayerische Motoren Werke AG
Current assignee: Bayerische Motoren Werke AG
Priority date: 1977-07-19
Filing date: 1978-05-31
Publication date: 1981-08-05
Also published as: DE2732474C3; FR2398256B1; FR2398256A1; DE2732474B2; IT1097522B; DE2732474A1; IT7825773A0

Description

NN (54) STRAINER FOR THE SUCTION PIPE OF A LUBRICANT PUMP (71) We, BAYERISCHE MOTOREN WERKE AKTIENGESELLSCHAFT, a German Body Corporate, of BMW-Haus, Petuelring 130, 8 Munched 40, German Federal Republic, do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement:- This invention relates to a strainer for the intake pipe of a lubricant pump in a lubricant-circulation system, the strainer having a sieve, an intake opening and a nonreturn valve.

A strainer of this construction is described in German Patent No. 459,328.

It comprises a non-return valve arranged on the strainer at the place where the suction pipe is connected, and an upstream cupshaped coarse sieve, the rim of which is secured to the housing of the non-return valve. In this construction, and particularly when the lubricant-collecting container is in an inclined position, a relatively large quantity of lubricant is necessary in order to ensure a sufficiently high level of lubricant for enabling it to be delivered, since the intake opening is disposed at a relatively great distance from the base of the strainer, and the strainer is at a minimum distance from the base of the lubricant-collecting container.

The aim of the present invention is to provide a strainer wherein delivery of the lubricant is ensured even when the container is inclined and the level of the lubricant is low.

According to the invention, this aim is achieved in that the intake opening is arranged in the base of the otherwise closed strainer, the non-return valve is arranged in the intake opening, the sieve is arranged between the non-return valve and a connecting part for attaching the suction pipe of a pump to the strainer, and the valve body of the non-return valve has a spherical surface and cooperates with a valve guide extending between the sieve and the base of the strainer.

This form of construction permits the intake opening to be arranged at the smallest possible distance from the base of the lubricant-collecting container so that, even when the level of the lubricant is very low, delivery of lubricant is fully ensured.

The invention will now be described in greater detail by reference to two forms of construction illustrated by way of example in the accompanying drawing, in which: Figure 1 shows a strainer with a non return valve for the intake pipe of a lubrcant pump in a lubricant-circulation system; and Figure 2 shows a modified form of the non-return valve arrangement in the strainer illustrated in Figure 1.

The strainer 1 shown in Figure 1 is for a lubricant pump in a lubricant-circulation system and consists mainly for a dished member 2 with a section port or passage 3, a circular coarse sieve 4, and a circular base 5 joined to, or integral with, an annular wall 6.

The upper edge 7 of the annular wall 6 is crimped round the- edge 8 of the dished member 2. The crimped edge 7 of the annular wall 6 also embraces the outer edge 9 of the coarse sieve 4 and thus secures these three main components of the strainer 1 to each other. The height of the annular wall 6 thus determines the distance be tween the base 5 and the coarse sieve 4.

Provided in the base 5 of the strainer 1 is a circular intake opening 10 in which is arranged a non-return valve 11.

The non-return valve 11 comprises a valve body 12 in the form of a section of a sphere, a valve seat 13 which is formed by the rim of the intake opening 10, and a valve guide or cage 14 which takes the form of a cylindrical perforated sheet-metal element secured to the coarse sieve 4. The spherical face of the valve body 12 co-operates with the valve seat 13 to open and close the valve intake opening 10.

Various positions of the valve body 12 are illustrated in Figure 1. The solid lines illustrate the valve body 12 when it rests on the valve seat 13 and closes the intake opening 10 in the base 5. The dash lines show the position of the valve body 12' when the non-return valve 11 is fully opened. The dash-dot lines, on the other hand, show the valve body 12" when it is held in the inclined position by the valve guide 14 and the coarse sieve 4 so that it is then able to rest fully on the valve seat 13 and close the intake opening 10 in the base 5. This is achieved by a particular choice of the dimensions of the valve body 12, the intake opening 10 or the valve seat 13, the valve guide 14 and the distance between the base 5 and the coarse sieve 4.

Because of the flat form of the valve body 12, the strainer 1 can be very shallow. The valve body 12 is expediently made of a suitable synthetic plastics material. If required, a spring can be fitted between the valve body 12 and the coarse sieve 4 so that the increased pressure-applying force thereby provided ensures a satisfactory seal at the non-return valve 11.

The form of construction shown in Figure 2 corresponds substantially to that of Figure 1. The only difference is that, in the Figure 2 construction, a non-return valve arrangement, consisting of two non-return valves 15, is provided instead of a single non-return valve 11. Formed in the base 5 are two intake openings 16 which correspond to the two non-return valves 15, and the rims of which form two valve seats.

The valve bodies 18 are spheres which are guided in guides or cages 19 secured to the coarse sieve 4. The guides or cages 19 are of cup-like construction and each has a slotted peripheral wall 20. The spherical valve bodies 18 are made of a suitable synthetic plastics material.

In both forms of construction, the main advantage is that the intake openings are considerably below the level of the lubricant, and functioning of the strainer is ensured when the amount of lubricant present is small. Furthermore, the coarse sieve has a large area and therefore offers little resistance on the suction side of the oil pump.

WHAT WE CLAIM IS: 1. A strainer for. the suction pipe of a lubricant pump in a lubricant-circulation system, the strainer having a sieve, an intake opening and a nonreturn valve, in which the intake opening is arranged in the base of the otherwise closed strainer, the non-return valve is arranged in the intake opening, the sieve is arranged between the non-return valve and a connecting part for attaching the suction pipe of a pump to the strainer, and the valve body of the non-return valve has a spherical surface and cooperates with a valve guide extending between the sieve and the base of the strainer.

2. A strainer according to claim 1, in which the valve body cooperates with a valve seat formed by the rim of the in-take opening.

3. A strainer according to claim 1 or claim 2, in which the valve guide is a cup-shaped sheet-metal part which has a slotted peripheral wall.

4. A strainer according to claim 3, in which the valve guide is secured by its base to the sieve.

5. A strainer according to any preceding claim, in which the valve body is a section of a sphere, the planar face of which is presented to the sieve.

6. A strainer for the suction pipe of a lubricant pump substantially as described herein with reference to the accompanying drawings.

**WARNING** end of DESC field may overlap start of CLMS **.

Claims

**WARNING** start of CLMS field may overlap end of DESC **. when the non-return valve 11 is fully opened. The dash-dot lines, on the other hand, show the valve body 12" when it is held in the inclined position by the valve guide 14 and the coarse sieve 4 so that it is then able to rest fully on the valve seat 13 and close the intake opening 10 in the base 5. This is achieved by a particular choice of the dimensions of the valve body 12, the intake opening 10 or the valve seat 13, the valve guide 14 and the distance between the base 5 and the coarse sieve 4. Because of the flat form of the valve body 12, the strainer 1 can be very shallow. The valve body 12 is expediently made of a suitable synthetic plastics material. If required, a spring can be fitted between the valve body 12 and the coarse sieve 4 so that the increased pressure-applying force thereby provided ensures a satisfactory seal at the non-return valve 11. The form of construction shown in Figure 2 corresponds substantially to that of Figure 1. The only difference is that, in the Figure 2 construction, a non-return valve arrangement, consisting of two non-return valves 15, is provided instead of a single non-return valve 11. Formed in the base 5 are two intake openings 16 which correspond to the two non-return valves 15, and the rims of which form two valve seats. The valve bodies 18 are spheres which are guided in guides or cages 19 secured to the coarse sieve 4. The guides or cages 19 are of cup-like construction and each has a slotted peripheral wall 20. The spherical valve bodies 18 are made of a suitable synthetic plastics material. In both forms of construction, the main advantage is that the intake openings are considerably below the level of the lubricant, and functioning of the strainer is ensured when the amount of lubricant present is small. Furthermore, the coarse sieve has a large area and therefore offers little resistance on the suction side of the oil pump. WHAT WE CLAIM IS:

1. A strainer for. the suction pipe of a lubricant pump in a lubricant-circulation system, the strainer having a sieve, an intake opening and a nonreturn valve, in which the intake opening is arranged in the base of the otherwise closed strainer, the non-return valve is arranged in the intake opening, the sieve is arranged between the non-return valve and a connecting part for attaching the suction pipe of a pump to the strainer, and the valve body of the non-return valve has a spherical surface and cooperates with a valve guide extending between the sieve and the base of the strainer.