JPH0141453Y2 - - 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 carry out reflux of oil, and a representative example is the one described in Japanese 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 outlet in the outflow side oil chamber with the full flow outlet is in a cantilevered state, and a bypass outlet passage is provided between the pipe and the nipple part. The pipe tends to become eccentric in order to form a bypass flow path that communicates with 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 periphery of the pipe is attached to the distal end of the plate. Therefore, due to the eccentricity of the pipe, the state of contact of the seal member to the outer periphery of the pipe becomes unstable, and the state of contact of the seal member to the outer periphery of the pipe becomes unstable due to the strength and dimensional accuracy of the plate. This makes it difficult to reliably partition the full flow side and the bypass side. Furthermore, since the inflow-side oil chamber and the bypass outflow path are partitioned by abutting a connecting piece and an upright part, this part cannot be reliably sealed, and unfiltered oil flows in. It may leak directly from the side oil chamber to the bypass outflow path.

This invention was made in view of the above points, and the object is to obtain a filter unit that can reliably partition and seal the full flow side and the bypass side.

Means for solving the problem An inflow oil chamber and an outflow oil chamber are formed in the case, which are partitioned by a full flow element and a bypass element, and a bracket is provided to cover the bottom of the case. An oil inlet communicating with the oil chamber, a full flow outlet and a bypass outlet are formed. A cylindrical nipple is fixed to the bracket, with 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 periphery of the nipple via a sealing member. A pipe is fixed within the nipple, and a nipple bypass passage is formed between the nipple and the pipe, one end of which communicates with the bypass outflow passage, and the other end of which communicates with the bypass outlet.

Function: One end of the bypass center pipe is brought into contact with the outer periphery of the nipple via the seal member, and the contact state of the seal member is stabilized, ensuring reliable sealing. Further, a pipe is fixed within the nipple to form a nipple bypass flow path, and the nipple portion is reliably partitioned into the full flow side and the bypass side.

Embodiment A first embodiment of this invention will be described based on FIG. 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. It is stored,
The inside of the case 1 is partitioned by these elements 4 and 7 into an inflow side oil chamber 8 at the outer periphery of the elements 4 and 7 and an outflow side oil chamber 9 at the inner periphery of the elements 4 and 7. In addition, on the inner peripheral part of the full flow element 4, there is a full flow inner pipe 10 whose upper and lower ends are bonded to the full flow end plates 2 and 3.
Furthermore, bypass end plates 5,
A bypass inner pipe 11 bonded to 6 is provided. A bypass center pipe 12 is provided in the outflow side oil chamber 9, and its upper and lower ends are bonded to the bypass end plates 5 and 6, and its lower end is pressed by a gasket, which will be described later. 9 is partitioned into a full flow outflow path 13 and a bypass outflow path 14. 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 gasket 17 is fixed to the periphery of the bottom of the case 1. A packing 18, which is a sealing member, is attached to the inner circumferential portion of the bypass end plate 6, and this packing 18 is in contact with the bypass center pipe 12, the cover 16, and the outer circumferential portion of a 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 bypass outlet 22, and this nipple 23 is further screwed into the screw hole 15. A cylindrical pipe 24 is caulked inside the nipple 23, and a nipple bypass passage 25 is formed between the outer peripheral surface of the pipe 24 and the inner peripheral surface of the nipple 23. One end of the nipple bypass flow path 23 is connected to the nipple 2.
3, a flow path hole 27 formed in the packing 18, and a flow path hole 28 formed in the bypass end plate 6, which communicate with the bypass outflow path 14. The other end of the nipple bypass passage 25 is communicated with the bypass outlet 22 via a passage hole 29 formed in the nipple 23 .

An O-ring 30 is interposed between the full flow end plate 3 and the bypass end plate 5. Further, a lower end portion of a full flow center pipe 31 extending upward is bonded to the full flow end plate 3.

In such a configuration, oil flowing from the oil inlet 20 flows into the inflow side oil chamber 8 from the flow path hole 32 formed in the cover 16, and most of the oil passes through the full flow element 4 and flows into the full flow outlet path 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 furthermore, the oil flows through the passage holes 28, 27,
26, 29 and the nipple bypass passage 25 from the bypass outlet 22 to the oil tank (not shown).
is refluxed to.

Here, the nipple bypass channel 25 is formed by caulking and fixing the pipe 24 inside the nipple 23, and can reliably partition the full flow side and the bypass side with the pipe 24 in between. In addition, the nipple 23 has one end attached to the bracket 19.
The cover 16 is supported by being screwed into the cover 16, and the substantially middle part is screwed into and supported by the cover 16, so that a stable support state can be obtained without eccentricity. Therefore, the state of contact of the packing 18 with the outer circumferential surface of the nipple 23 is stabilized, and sealing between the full flow outlet passage 13 and the bypass outlet passage 14 at the outer circumference of the nipple 23 can be reliably performed. Furthermore, the contact between the packing 18 and the bypass center pipe 12 ensures the sealing between the full-flow outflow path 13 and the bypass outflow path 14 at the lower end of the bypass center pipe 12. Furthermore, the cover 16 of the packkin 18
The contact between the bypass outflow path 14 and the inflow side oil chamber 8 can be reliably sealed. In this way, the pipe 24 forming the nipple bypass flow path 25 is integrated with the nipple 23, and the seal between the full flow outflow path 13, the bypass outflow path 14, and the inflow side oil chamber 8 is created by one packing 18. Therefore, assembly can be easily performed when replacing the filter, etc.

Next, the upper end of the bypass center pipe 10 is bonded to the bypass end plate 5, thereby preventing oil leakage between the bypass outflow path 14 and the full flow outflow path 13 at the upper end of the bypass center pipe 12. Further, the O-ring 30 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 31. Therefore, when the engine is stopped, this full flow center pipe 3
The full-flow element 4 is immersed in oil up to a position equal to the height of 1, and the full-flow element 4 is prevented from drying.

Next, a second embodiment of this invention will be explained based on FIG. 2. Incidentally, the same parts as those explained in FIG. 1 are indicated by the same reference numerals, and the explanation thereof will be omitted. In this embodiment, first, the lower end of the bypass center pipe 12 is bonded to the inside of the bent portion of the bypass end plate 6, and the outside of this bent portion is brought into contact with the packing 18, thereby sealing the full flow outflow path 13 and the bypass outflow path 14. is being carried out. A pipe 33 is caulked into the flow passage hole 28 to prevent the flow passage hole 28 from being blocked by adhesive when the lower end of the bypass inner pipe 11 is bonded to the bypass end plate 6. Furthermore, this pipe 33
also serves as a guide for the bypass inner pipe 11. Further, the lower end of the full-flow center pipe 31 is spot-welded to the lower end of the full-flow inner pipe 10, and the full-flow center pipe 31 and the full-flow inner pipe 10 are integrally bonded to the full-flow end plate 3 together with the lower end of the full-flow element 4. ing.

In the first and second embodiments, the pipe 24 is fixed to the nipple 23 by caulking, but it may also be fixed by press-fitting or the like.

Effects of the invention This invention fixes the pipe inside the nipple as described above, and forms a nipple bypass passage that communicates the bypass outflow passage and the bypass outlet between the nipple and the pipe, so that the The full flow side and the bypass side can be reliably partitioned, and since the nipple and pipe are integrated, assembly when replacing the filter can be easily performed.Furthermore, one end of the bypass center pipe By contacting the outer periphery of the nipple fixed to the bracket via the sealing member, it is possible to achieve a reliable seal.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional front view showing a first embodiment of this invention, and FIG. 2 is a longitudinal sectional front view showing a second embodiment of this invention. 1...Case, 4...Full flow element,
5...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...Pipe, 2
5...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. A bracket is provided that forms an oil inlet communicating with the oil chamber and covers the bottom of the case, and the bracket has a cylindrical shape having one end extending into the outflow side oil chamber and the other end communicating with the full flow outlet. A bypass center pipe is provided for fixing the nipple and partitioning 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 periphery of the nipple via a sealing member, and is inserted into the nipple. A filter unit characterized in that a pipe is fixed, and a nipple bypass passage is formed between the nipple and the pipe, one end communicating with the bypass outflow passage and the other end communicating with the bypass outlet. .