JPH0141458Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field This invention relates to a filter unit having a full flow channel and a bypass channel.

BACKGROUND ART Conventionally, in a filter unit, the inside of the case is generally partitioned into an inflow side oil chamber and an outflow side oil chamber by a filter housed in the case. In addition, a full-flow element and a bypass element are used as filters to partition the oil chamber on the outflow side into a full-flow outflow path and a bypass outflow path, and oil is supplied from the full-flow outflow path to the engine section and from the bypass outflow path to the oil tank. There are some that recirculate the oil.
A typical example is the one described in Publication of Utility Model Publication No. 12566/1983.

Problems to be Solved by the Invention In order to partition the outflow side oil chamber into a full flow outflow path and a bypass outflow path, partition members and sealing members must be used, and each of these members must be maintained in a stable installation state. According to Utility Model Publication No. 60-12566, the pipe inside the nipple part that communicates the full-flow outflow path in the outflow side oil chamber with the full-flow outlet is in a cantilevered state, and furthermore, the pipe and the nipple part are in a cantilevered state. The pipe tends to be eccentric because it forms a bypass flow path that communicates the bypass outflow path and the bypass outlet. Further, a plate for partitioning the full flow outflow path and the bypass outflow path is inclined downward, and a sealing member that comes into contact with the outer circumferential surface of the pipe is attached to the distal end of the plate.
Therefore, due to the eccentricity of the pipe, the contact state of the seal member to the outer peripheral surface of this pipe becomes unstable,
Further, the strength and dimensional accuracy of the plate also make the contact state of the seal member against the outer circumferential surface of the pipe unstable, making it difficult to reliably partition the full flow side and the bypass side. Furthermore, since the partition between the inflow side oil chamber and the bypass outflow path is achieved by abutting a connecting piece or an upright part, it is not possible to reliably seal this part, and unfiltered oil leaks out. In some cases, oil may leak directly from the inflow side oil chamber to the bypass outflow path.

Means for solving the problem The inside of the case is partitioned into an inflow oil chamber and an outflow oil chamber by a full flow element and a bypass element, and an oil inlet communicating with the full flow outlet, the bypass outlet, and the inflow oil chamber is formed. A bracket covers the bottom of the case, and a cylindrical nipple is secured to the bracket, one end extending into the outflow oil chamber and the other end communicating with the full flow outlet. A bypass center pipe is provided to partition the outflow side oil chamber into a full flow outflow path and a bypass outflow path, and one end of the bypass center pipe is brought into contact with the outer peripheral surface of the nipple via a sealing member. A nipple bypass channel is formed in the peripheral wall of the nipple, one end communicating with the bypass outflow channel and the other end communicating with the bypass outlet.

Function: One end of the bypass center pipe is brought into contact with the outer peripheral surface of the nipple via the seal member, and the nipple is fixed to the bracket, so that the contact state of the seal member is stable and sealing is performed reliably. In addition, the nipple bypass flow path is formed in the peripheral wall of the nipple, which reduces the number of parts needed to form the nipple bypass flow path, and facilitates assembly.

Embodiment An embodiment of this invention will be described based on the drawings. Inside the case 1 with an opening at the bottom, there are a full flow element 4 whose upper and lower ends are bonded to a pair of upper and lower full flow end plates 2 and 3, and a bypass element 7 whose upper and lower ends are bonded to a pair of upper and lower bypass end plates 5 and 6. The inside of the case 1 is partitioned by these elements 4 and 7 into an inflow side oil chamber 8 on the outer periphery of the elements 4 and 7 and an outflow side oil chamber 9 on the inner periphery of the elements 4 and 7. In addition, the inner peripheral part of the full flow element 4 has full flow end plates 2 and 3 at both upper and lower ends.
A full flow inner pipe 10 is provided which is bonded to the bypass element 7, and a bypass inner pipe 11 which has both upper and lower ends bonded to the bypass end plates 5 and 6 is also provided on the inner peripheral portion of the bypass element 7. A bypass center pipe 12 whose upper and lower ends are bonded to the bypass end plates 5 and 6 is provided in the outflow side oil chamber 9, and the bypass center pipe 12 allows the outflow side oil chamber 9 to be connected to a full flow outflow path 13 and a bypass outflow path. 1
It is divided into 4. Note that the lower end of the bypass center pipe 12 is connected to the bypass end plate 6.
It is glued to the inside surface of the upwardly bent part. A cover 16 having a large diameter screw hole 15 formed in the center is fixed to the bottom of the case 1, and a packing 17 is fixed to the periphery of the bottom of the case 1. The bypass end plate 6
A gasket 18, which is a sealing member, is attached to the inner circumferential portion of the nipple, and this gasket 18 is in contact with the cover 16 and the outer circumferential portion of the nipple, which will be described later.

Next, a bracket 19 is provided which is detachably attached to the bottom of the case 1, and this bracket 19 is formed with an oil inlet 20, a full flow outlet 21, and a bypass outlet 22. A cylindrical nipple 23 is screwed into the full flow outlet 21, and this nipple 23 is further screwed into the screw hole 15. Said nipple 23
The upper end extends into the full flow outflow passage 13, and the packing 18 is in contact with the outer peripheral surface of the upper end of the nipple 23.

Here, a nipple bypass channel 2 is provided in the peripheral wall of the nipple 23 in parallel with the center line of the nipple 23.
4 is formed by drilling. The upper end of this nipple bypass passage 24 is connected to the packing 1.
8 and a flow path hole 26 formed in the bypass end plate 6 . In addition,
A pipe 27 is caulked to the flow passage hole 26 to prevent the flow passage hole 26 from being blocked by adhesive when the lower end of the bypass inner pipe 11 is bonded to the bypass end plate 6. Further, the other end of the nipple bypass passage 24 is communicated with the bypass outlet 22.

An O-ring 28 is interposed between the full flow end plate 3 and the bypass end plate 5. Further, a full flow center pipe 29 is provided above the bypass center pipe 12.
is arranged, and this full flow center pipe 29
The lower end is spot welded to the lower end of the full flow inner pipe 10.

In such a configuration, oil flowing from the oil inlet 20 flows into the inflow side oil chamber 8 from the flow passage hole 30 formed in the cover 16, and most of the oil passes through the full flow element 4 and flows into the full flow outlet passage 13. The water then passes through the nipple 23 and is supplied to each part of the engine from the full flow outlet 21. Further, a part of the oil that has flowed into the inflow side oil chamber 8 passes through the bypass element 7 and reaches the bypass outflow passage 14, and further passes through the passage holes 26, 25 and the nipple bypass passage 24 to the bypass outlet 22. The oil is then returned to the oil tank (not shown) from the bypass outlet 22.

Here, the nipple bypass flow path 25 is formed by drilling a hole in the peripheral wall of the nipple 23, and the nipple 23 is connected to the bracket 19 and the cover 1.
By screwing into the threaded hole 15 of No. 6, the nipple bypass flow path 24 brings the bypass outflow path 14 and the bypass outlet 22 into communication. Therefore, assembly is simplified and the number of parts required to form the bypass outflow passage 24 is reduced. Furthermore, the nipple 23 can be reliably partitioned into the full flow side and the bypass side. Also, nipple 2
3 is supported by screwing its lower end into a bracket 19, and its approximately middle portion is screwed into a screw hole 15 of a cover 16, so that a stable support state can be obtained without eccentricity. For this reason, Patsukin 18
The state of contact with the outer peripheral surface of the nipple 23 is stabilized, and sealing between the full flow side and the bypass side with the gasket 18 in between can be reliably performed. Also, Patsukin 1
8 to the cover 16 is also stabilized, and leakage of oil from the inflow side oil chamber 8 to the bypass side is prevented.

Next, the upper end of the bypass center pipe 12 is bonded to the bypass end plate 5, and leakage of oil between the bypass outflow path 14 and the full flow outflow path 13 at the upper end of the bypass center pipe 12 is prevented. Further, the O-ring 28 prevents oil from leaking between the full flow end plate 3 and the bypass end plate 5. The oil that has passed through the full-flow element 4 and reached the outflow-side oil chamber 9 reaches the inside of the full-flow outflow path 13 from the upper end of the full-flow center pipe 29 . Therefore, when the engine is stopped, this full flow center pipe 2
The full-flow element 4 is immersed in oil up to a position equal to the height of 9, and the full-flow element 4 is prevented from drying.

Although this embodiment has been described with one nipple bypass flow path 24 formed, the number of nipple bypass flow paths 24 is not limited to one, and a plurality of nipple bypass flow paths 24 may be formed.

Effects of the invention This invention reduces the number of parts required to form the nipple bypass flow path and simplifies assembly work by forming the nipple bypass flow path on the peripheral wall of the nipple as described above. Moreover, it is possible to reliably partition the full flow side and the bypass side at the nipple part, and furthermore, one end of the bypass center pipe can be brought into contact with the outer peripheral surface of the nipple fixed to the bracket via a sealing member. This has the effect of ensuring reliable sealing.

[Brief explanation of the drawing]

The drawing is a longitudinal sectional front view showing an embodiment of this invention. 1...Case, 4...Full flow element,
7...Bypass element, 8...Inflow side oil chamber, 9...Outflow side oil chamber, 12...Bypass center pipe, 13...Full flow outflow path, 14
...Bypass outlet, 18...Packing (sealing member), 19...Bracket, 20...Oil inlet, 21...Full flow outlet, 22...Bypass outlet, 23...Nipple, 24...Nipple bypass flow path.

Claims (1)

[Scope of utility model registration request] A case with an opening at the bottom is provided, which is partitioned by a full flow element and a bypass element into an inflow side oil chamber on the outer periphery of these elements and an outflow side oil chamber on the inner periphery of these elements, and a full flow outlet, a bypass outlet, and the inflow side. An oil inlet communicating with the oil chamber is formed, and a bracket is provided to cover the bottom of the case, and a cylindrical nipple has one end extending into the outflow side oil chamber and the other end communicating with the full flow outlet. is fixed to the bracket, and a bypass center pipe is provided which partitions the outflow side oil chamber into a full flow outflow path and a bypass outflow path, and one end of this bypass center pipe is brought into contact with the outer circumferential surface of the nipple via a sealing member. A filter unit characterized in that a nipple bypass passage is formed in a peripheral wall of the nipple, the nipple bypass flow passage communicating with the bypass outflow passage and having the other end communicating with the bypass outlet.