JP2023069673A - Filter and chain saw - Google Patents

Abstract

To provide a technique that can firmly fit a filter member to a holding member, and can easily perform a fitting work for fitting the filter member to the holding member.SOLUTION: Disclosed is a filter. The filter comprises a filter member which has a substantially cylindrical shape and is elastically deformable in a radial direction, a holding member which includes a holding part having a substantially columnar shape and to which the filter member is fitted, and a flow channel through a fluid passes, and may comprise a flow channel member fixed to the holding member. An outermost diameter of the holding part may be larger than an inner diameter of the filter member during unloading. When the filter member is fitted to the holding member, an inner peripheral surface of the filter member and an outer peripheral surface of the holding part may partially contact each other, and the remainders may not contact. When the filter member is fitted to the holding member, the flow channel may open in the filter member.SELECTED DRAWING: Figure 6

Description

TECHNICAL FIELD The technology disclosed herein relates to filters and chainsaws.

Patent Literature 1 discloses a chain saw. The chain saw includes a saw chain, a guide bar to which the saw chain is attached, a sprocket for running the saw chain along the periphery of the guide bar, a motor comprising an output shaft connected to the sprocket, and the An oil pump connected to an output shaft, an oil tank for storing lubricating oil, an introduction pipe for sending the lubricating oil from the oil tank to the oil pump, and an outlet for sending the lubricating oil from the oil pump to the guide bar. and a filter mounted on the inlet pipe inside the oil tank. The filter includes a filter member, a support member having a holding portion capable of holding the filter member, and a channel through which fluid passes, and includes a channel member fixed to the support member. The channel communicates with the space inside the filter member when the filter member is attached to the support member.

JP-A-2000-317902

When manufacturing such a filter, it is required that the filter member can be firmly attached to the support member and that the filter member can be easily attached to the support member. The present specification provides a technique that enables the filter member to be firmly attached to the support member and the operation of attaching the filter member to the support member to be performed easily.

This specification discloses a filter. The filter has a substantially cylindrical shape and includes a radially elastically deformable filter member, a support member having a holding portion capable of holding the filter member, and a flow path through which a fluid passes, A channel member fixed to the support member may be provided. When the filter member is attached to the support member, the channel may communicate with the space inside the filter member. An outermost diameter of the holding portion may be larger than an inner diameter of the filter member when no load is applied. When the filter member is attached to the support member, the outer surface of the holding portion may partially contact the inner surface of the filter member in the circumferential direction, and the remaining portion may contact the inner surface of the filter member. They do not have to be in contact with each other.

In the above configuration, since the filter member is attached to the holding portion in a state in which the diameter of the filter member is expanded as compared to when no load is applied, the elastic restoring force of the filter member strongly presses the inner surface of the filter member against the outer surface of the holding portion. can be firmly attached to the support member. Further, in the above configuration, the outer surface of the holding portion is partially in contact with the inner surface of the filter member in the circumferential direction, and the remaining portion is not in contact with the inner surface of the filter member, so that the filter member is attached to the support member. In this case, the inner surface of the filter member can be brought into contact with the outer surface of the holding portion by partially expanding the diameter of the filter member without the need to expand the diameter of the filter member over the entire circumference. With such a configuration, the work of attaching the filter member to the support member can be easily performed.

This specification also discloses a chainsaw. The chain saw includes a saw chain, a guide bar to which the saw chain is attached, a sprocket for running the saw chain along the periphery of the guide bar, a motor comprising an output shaft connected to the sprocket, and the An oil pump connected to an output shaft, an oil tank for storing lubricating oil, an introduction pipe for sending the lubricating oil from the oil tank to the oil pump, and an outlet for sending the lubricating oil from the oil pump to the guide bar. There may be a tube and a filter provided in the inlet tube inside the oil tank. The filter has a substantially cylindrical shape and includes a radially elastically deformable filter member, a support member having a holding portion capable of holding the filter member, and a flow path through which a fluid passes, A channel member fixed to the support member may be provided. When the filter member is attached to the support member, the channel may communicate with the space inside the filter member. An outermost diameter of the holding portion may be larger than an inner diameter of the filter member when no load is applied. When the filter member is attached to the support member, the outer surface of the holding portion may partially contact the inner surface of the filter member in the circumferential direction, and the remaining portion may contact the inner surface of the filter member. They do not have to be in contact with each other.

It is the perspective view which looked at the chainsaw 2 of an Example from the back right upper part. It is the perspective view which looked at the chainsaw 2 of an Example from the front left lower part. It is the side view which looked at the chainsaw 2 of an Example from the right. Fig. 2 is a side view of the inside of the body housing 10 of the chain saw 2 of the embodiment, viewed from the left. Fig. 3 is a side view of the chain saw 2 of the embodiment, with the sprocket cover 20 removed, as viewed from the right. Fig. 3 is an exploded perspective view of the introduction pipe 42 and the filter 52 of the chain saw 2 of the embodiment as seen from the rear right upper side; Fig. 3 is a cross-sectional view of an oil tank 32 of the chain saw 2 of the embodiment; Fig. 3 is a perspective view of the filter mounting member 50 of the chain saw 2 of the embodiment as seen from the rear left upper side; Fig. 3 is a perspective view of the filter mounting member 50 of the chain saw 2 of the embodiment as seen from the rear right upper side; 4 is a longitudinal sectional view of an introduction pipe 42 and a filter 52 of the chain saw 2 of the embodiment; FIG. Fig. 3 is a cross-sectional view of the filter 52 of the chain saw 2 of the embodiment; It is a cross-sectional view of the filter 52 of the chain saw 2 of a modification.

Below, representative and non-limiting embodiments of the present invention will be described in detail with reference to the drawings. This detailed description is merely intended to provide those skilled in the art with details for implementing a preferred embodiment of the invention, and is not intended to limit the scope of the invention. Moreover, the additional features and inventions disclosed below can be used separately or in conjunction with other features and inventions to provide further improved filters, chainsaws, methods of making and using the same. can.

Moreover, any combination of features and steps disclosed in the following detailed description are not required to practice the invention in its broadest sense, but are specifically intended to illustrate representative embodiments of the invention only. is described. Moreover, various features of the exemplary embodiments described above and below, as well as those set forth in the independent and dependent claims, are described herein in providing additional and useful embodiments of the invention. They do not have to be combined in the exact order given or in the order listed.

All features set forth in the specification and/or claims, apart from the configuration of the features set forth in the examples and/or claims, are limitations on the original disclosure and claimed subject matter: They are intended to be disclosed separately and independently of each other. Moreover, all numerical ranges and groupings or populations are intended to disclose configurations intermediate therebetween as limitations on the original disclosure as well as the specific subject matter claimed.

In one or more embodiments, the filter has a substantially cylindrical shape and includes a radially elastically deformable filter member, a support member having a holding portion capable of holding the filter member, and a fluid. A channel member may be provided which has a channel therethrough and is fixed to the support member. When the filter member is attached to the support member, the channel may communicate with the space inside the filter member. An outermost diameter of the holding portion may be larger than an inner diameter of the filter member when no load is applied. When the filter member is attached to the support member, the outer surface of the holding portion may partially contact the inner surface of the filter member in the circumferential direction, and the remaining portion may contact the inner surface of the filter member. They do not have to be in contact with each other.

In the above configuration, since the filter member is attached to the holding portion in a state in which the diameter of the filter member is expanded as compared to when no load is applied, the elastic restoring force of the filter member strongly presses the inner surface of the filter member against the outer surface of the holding portion. can be firmly attached to the support member. Further, in the above configuration, the outer surface of the holding portion is partially in contact with the inner surface of the filter member in the circumferential direction, and the remaining portion is not in contact with the inner surface of the filter member, so that the filter member is attached to the support member. In this case, the inner surface of the filter member can be brought into contact with the outer surface of the holding portion by partially expanding the diameter of the filter member without the need to expand the diameter of the filter member over the entire circumference. With such a configuration, the work of attaching the filter member to the support member can be easily performed.

In one or more embodiments, the retainer may have at least two chamfers. In the at least two chamfered portions, the outer surface of the holding portion may not be in contact with the inner surface of the filter member.

In the above configuration, since the inner surface of the filter member and the outer surface of the holding portion do not abut on at least two chamfered portions, the work of attaching the filter member to the support member can be performed more easily.

In one or more embodiments, the filter member may be a coil spring.

According to the above configuration, the cost of manufacturing the filter can be further reduced by using the coil spring, which is inexpensive and readily available, as the filter member.

In one or more embodiments, the support member may further comprise a locking portion positioned adjacent to the holding portion with respect to the axial direction of the filter member. An outer diameter of the locking portion may be smaller than the outermost diameter of the holding portion.

In the above configuration, when the filter member is attached to the support member, part of the filter member enters the locking portion. At this time, since the outer diameter of the locking portion is smaller than the outermost diameter of the holding portion, the inner diameter of the filter member inserted into the locking portion is smaller than the outermost diameter of the holding portion. This causes engagement between the filter member and the support member. With such a configuration, it is possible to prevent the filter member from unexpectedly coming off the support member.

In one or more embodiments, the support member and the channel member may be integrally formed.

According to the above configuration, it is possible to reduce the number of parts of the filter.

In one or more embodiments, the fluid may be lubricating oil used in chain saws.

According to the above configuration, in the lubricating oil filter used in the chain saw, the filter member can be firmly attached to the support member, and the operation of attaching the filter member to the support member can be performed easily.

In one or more embodiments, a chain saw includes a saw chain, a guide bar to which the saw chain is attached, a sprocket for running the saw chain along the circumference of the guide bar, and a sprocket connected to the sprocket. an oil pump connected to the output shaft; an oil tank for storing lubricating oil; an introduction pipe for sending the lubricating oil from the oil tank to the oil pump; A lead-out pipe for sending the lubricating oil to the guide bar and a filter provided in the lead-in pipe inside the oil tank may be provided. The filter has a substantially cylindrical shape and includes a radially elastically deformable filter member, a support member having a holding portion capable of holding the filter member, and a flow path through which a fluid passes, A channel member fixed to the support member may be provided. When the filter member is attached to the support member, the channel may communicate with the space inside the filter member. An outermost diameter of the holding portion may be larger than an inner diameter of the filter member when no load is applied. When the filter member is attached to the support member, the outer surface of the holding portion may partially contact the inner surface of the filter member in the circumferential direction, and the remaining portion may contact the inner surface of the filter member. They do not have to be in contact with each other.

(Example)
As shown in FIGS. 1 and 2, the chain saw 2 of this embodiment includes a main body 4, a guide bar 6, and a saw chain 8. As shown in FIGS. The guide bar 6 is an elongated plate-like member attached to the main body 4 so as to protrude forward from the main body 4 . A saw chain 8 is provided with a plurality of interconnected cutters and is mounted along the circumference of the guide bar 6 . A battery pack B is detachably attached to the main body 4 . The chain saw 2 cuts an object to be cut such as wood by driving the saw chain 8 to rotate along the periphery of the guide bar 6 with electric power supplied from the battery pack B. As shown in FIG. In the following description, as shown in FIG. 3, when the chain saw 2 is placed on a horizontal mounting surface S such as the ground, the direction perpendicular to the mounting surface S is referred to as the vertical direction of the chain saw 2. The direction obtained by projecting the longitudinal direction of the guide bar 6 onto the mounting surface S is referred to as the front-rear direction of the chain saw 2 , and the direction orthogonal to the vertical direction and the front-rear direction of the chain saw 2 is referred to as the left-right direction of the chain saw 2 . In the drawings other than FIGS. 1 to 3, illustration of the saw chain 8 is omitted for clarity of illustration.

As shown in FIG. 1, the main body 4 includes a main body housing 10, a rear handle 12 that can be held by a user with one hand, and a user holding the rear handle 12. a rear hand guard 14 for protecting the hands of the user, a front handle 16 which is arranged in front of the rear handle 12 and can be gripped by the other hand of the user, and a hand of the user gripping the front handle 16. and a sprocket cover 20 detachably attached to the right front part of the body housing 10. - 特許庁A power button 22 is arranged on the upper surface near the front end of the rear handle 12 for the user to turn on/off the power of the chain saw 2 . A trigger lever 24 is arranged on the lower surface near the front end of the rear handle 12 for the user to operate the saw chain 8 to rotate. Further, on the upper surface of the rear handle 12, a lock lever 26 that switches between a state in which the user's operation of the trigger lever 24 is permitted and a state in which it is prohibited is arranged. When using the chain saw 2, the user holds the chain saw 2 by holding the rear handle 12 with the right hand and holding the front handle 16 with the left hand. From this state, when the user pushes down the lock lever 26 of the rear handle 12 with the palm of the right hand, the user is permitted to operate the trigger lever 24. In this state, the user pulls up the trigger lever 24 with the index finger of the right hand. By operating it, the saw chain 8 is rotationally driven.

As shown in FIG. 4 , a control unit 28 , a motor 30 , an oil tank 32 and an oil pump 34 are arranged inside the body housing 10 . The motor 30 is, for example, an inner rotor type DC brushless motor. The control unit 28 comprises an inverter circuit with switching elements and a control circuit for controlling the operation of each switching element. The control unit 28 controls the operation of the motor 30 by controlling the power supplied to the motor 30 according to the user's operation of the trigger lever 24 .

As shown in FIG. 5, a sprocket 38 is fixed to the output shaft 36 of the motor 30 . The sprocket 38 is exposed to the outside of the body housing 10 and is covered with a sprocket cover 20 (see FIG. 1). A saw chain 8 (see FIG. 1) is laid over the sprocket 38 from the guide bar 6 . When the motor 30 is driven, the sprocket 38 rotates with the output shaft 36 , causing the saw chain 8 to rotate about the sprocket 38 and the guide bar 6 .

The front hand guard 18 is rotatable with respect to the body housing 10 between a normal position raised upward and a stop position pushed forward. The front hand guard 18 is connected to a brake mechanism (not shown). The brake mechanism brakes the rotation of the saw chain 8 by mechanically braking the rotation of the output shaft 36 when the front handguard 18 is in the stop position.

Lubricating oil for lubricating the saw chain 8 is stored in the oil tank 32 shown in FIG. The oil tank 32 is formed with a replenishment opening 32a for replenishing lubricating oil. A cap 40 is detachably attached to the replenishment opening 32a. As shown in FIG. 2 , the cap 40 of the oil tank 32 is arranged on the front left surface of the body housing 10 and exposed to the outside of the body housing 10 .

As shown in FIG. 4, oil pump 34 is coupled to output shaft 36 of motor 30 . The oil pump 34 sucks out the lubricating oil from the oil tank 32 through the introduction pipe 42 in conjunction with the rotation of the motor 30 , and sends out the lubricating oil toward the guide bar 6 through the outlet pipe 44 . The introduction pipe 42 and the discharge pipe 44 are flexible tubular members made of a rubber material such as nitrile rubber or silicone rubber. The lead-out pipe 44 may be made of a resin material such as soft vinyl chloride. The lubricating oil sent to the lead-out pipe 44 is supplied to the guide bar 6 and the saw chain 8 (see FIG. 1). The discharge amount of lubricating oil supplied from the oil tank 32 to the guide bar 6 by the oil pump 34 can be adjusted via an adjusting pin 46 .

As shown in FIG. 2, the lower surface of the body housing 10 is formed with an adjustment opening 10a through which the adjustment pin 46 can be accessed from the outside. A user can adjust the amount of lubricating oil discharged from the oil pump 34 by inserting a tool through the adjustment opening 10 a and rotating the adjustment pin 46 . The adjustment opening 10 a is arranged near the left end of the main body housing 10 with respect to the left-right direction of the chain saw 2 .

As shown in FIG. 4, the leading end of the introduction pipe 42 is inserted into the oil tank 32 through a through hole 32b formed in the vicinity of the rear lower end of the oil tank 32. As shown in FIG. As shown in FIG. 6, the introduction pipe 42 is formed with a seal portion 42a, a skirt portion 42b, and a flange portion 42c. The seal portion 42a has a substantially cylindrical outer shape. The outer diameter of the seal portion 42a is slightly larger than the inner diameter of the through hole 32b of the oil tank 32 (see FIG. 4). The skirt portion 42b is arranged closer to the tip of the introduction tube 42 than the seal portion 42a. The skirt portion 42b has a substantially truncated cone-like outer shape whose diameter increases as the distance from the tip of the introduction pipe 42 increases. The maximum outer diameter of the skirt portion 42b is slightly larger than the outer diameter of the seal portion 42a. The flange portion 42c is arranged farther from the tip of the introduction pipe 42 than the seal portion 42a. The flange portion 42c has a substantially cylindrical outer shape. The outer diameter of the flange portion 42c is larger than the outer diameter of the seal portion 42a and larger than the maximum outer diameter of the skirt portion 42b. As shown in FIG. 7, when the tip of the introduction pipe 42 is inserted into the through-hole 32b from the outside to the inside of the oil tank 32, the skirt portion 42b is elastically deformed and passes through the through-hole 32b. The portion 42a elastically deforms and fits into the through hole 32b. As a result, the skirt portion 42b contacts the inner surface of the oil tank 32 and the flange portion 42c contacts the outer surface of the oil tank 32, and the through hole 32b is sealed by the seal portion 42a.

A filter 52 is attached to the tip of the introduction pipe 42 inside the oil tank 32 . Filter 52 includes filter member 48 and filter mounting member 50 . As shown in FIG. 6, the leading end of the introduction tube 42 is formed with a mounting portion 42d and a stepped portion 42e. The mounting portion 42d has a substantially truncated conical outer shape whose diameter increases with increasing distance from the tip of the introduction pipe 42. As shown in FIG. The stepped portion 42e is arranged farther from the tip of the introduction tube 42 than the mounting portion 42d. The stepped portion 42e has a substantially cylindrical outer shape. The outer diameter of the stepped portion 42e is slightly larger than the maximum outer diameter of the mounting portion 42d. The filter member 48 has a substantially cylindrical shape and is elastically deformable in radial and axial directions. The filter member 48 is a coil spring made of a metal material such as hard steel wire, piano wire, or stainless steel. suppress the passage of The axial dimension of the filter member 48 is, for example, about 5 to 50 mm, the radial dimension of the filter member 48 is, for example, about 3 to 10 mm, and the diameter of the wire material of the filter member 48 is, for example, about 0.5 mm. be. As shown in FIG. 7, when the filter 52 is attached to the tip of the introduction pipe 42, the filter member 48 is arranged in the vicinity of the rear lower end inside the oil tank 32 so that the axial direction extends in the left-right direction.

As shown in FIG. 8, the filter mounting member 50 includes an insertion portion 50a, a cylindrical portion 50b, an inflow portion 50c, a holding portion 50d, a locking portion 50e, and a disk portion 50f. The insertion portion 50a, the cylindrical portion 50b, the inflow portion 50c, the holding portion 50d, the locking portion 50e, and the disk portion 50f are seamlessly and integrally formed. The filter mounting member 50 is made of a resin material such as polyacetal. A plurality of retainers 50g are formed on the outer peripheral surface of the insertion portion 50a. A flow path 50h through which lubricating oil passes is formed inside the insertion portion 50a and the cylindrical portion 50b. The inflow portion 50c has a substantially cylindrical shape. The outer diameter of the inflow portion 50c is smaller than the outer diameter of the cylindrical portion 50b. An inflow space 50i is formed in the inflow portion 50c so as to penetrate the inflow portion 50c from one side surface to the other side surface. As shown in FIG. 9, the inflow space 50i communicates with the flow path 50h. As shown in FIG. 8, the holding portion 50d includes a substantially cylindrical cylindrical portion 50j and a chamfered portion 50k obtained by chamfering the cylindrical portion 50j. In this embodiment, the holding portion 50d has two chamfered portions 50k arranged symmetrically with respect to the central axis of the cylindrical portion 50j. The outer diameter of the cylindrical portion 50j is larger than the outer diameter of the cylindrical portion 50b. The locking portion 50e has a substantially cylindrical shape. The outer diameter of the locking portion 50e is smaller than the outer diameter of the cylindrical portion 50j. The width of the engaging portion 50e (that is, the dimension of the engaging portion 50e in the direction along the central axis) is larger than the diameter of the wire of the filter member 48, for example, 1.5 times the diameter of the wire of the filter member 48-2. It has about twice the size, for example, about 0.75 mm. The disk portion 50f has a substantially disk shape. The outer diameter of the disc portion 50f is larger than the outer diameter of the columnar portion 50b and larger than the outer diameter of the columnar portion 50j. In addition, hereinafter, the insertion portion 50a and the cylindrical portion 50b of the filter mounting member 50 will be collectively referred to as the flow path member 54, and the inflow portion 50c, the holding portion 50d, the locking portion 50e, and the The disc portion 50f is also generically referred to as a support member 56. As shown in FIG. The channel member 54 and the support member 56 are integrally formed.

As shown in FIG. 10, a filter mounting member 50 is inserted into the filter member 48 from the right side. When the filter member 48 is attached to the filter attachment member 50 , the right end of the filter member 48 abuts the disk portion 50 f of the filter attachment member 50 . Since the outermost diameter of the holding portion 50d of the filter mounting member 50 (that is, the outer diameter of the cylindrical portion 50j) is larger than the inner diameter of the filter member 48, the filter member 48 is elastically moved in the vicinity of the holding portion 50d. In the expanded state, the inner surface of the filter member 48 is pressed against the outer surface of the cylindrical portion 50j. This allows the filter member 48 to be firmly attached to the filter attachment member 50 .

As shown in FIG. 11, the outer surface of the cylindrical portion 50j of the holding portion 50d contacts the inner surface of the filter member 48, but the outer surface of the chamfered portion 50k of the holding portion 50d does not contact the inner surface of the filter member 48. As shown in FIG. The ratio of the cylindrical portion 50j to the entire circumference of the filter mounting member 50, for example, the ratio of the angular range of the cylindrical portion 50j to the entire circumference of 360° of the filter mounting member 50 is, for example, 50% (equivalent to 180°)-78% (280°). °), for example 67% (corresponding to 240°). With such a configuration, the work of attaching the filter member 48 to the filter attachment member 50 can be easily performed. In addition, in FIG. 11, the filter member 48 is illustrated by an annular ring having a width in the radial direction for clarity of illustration.

As shown in FIG. 10, when the filter member 48 is attached to the filter attachment member 50, the right end of the filter member 48 enters the locking portion 50e between the holding portion 50d and the disk portion 50f, thereby Member 48 engages filter mounting member 50 . For example, when the filter member 48 is a coil spring and the width of the locking portion 50e (eg, 0.75 mm) is about 1.5 times the diameter of the wire of the filter member 48 (eg, 0.5 mm), , one wire rod at the end of the filter member 48 enters the engaging portion 50 e , and the filter member 48 engages with the filter mounting member 50 . Therefore, it is possible to prevent the filter member 48 from unintentionally coming off from the filter mounting member 50 .

In the filter mounting member 50 to which the filter member 48 is attached, the insertion portion 50a of the filter mounting member 50 is inserted into the mounting portion 42d from the right side, and the mounting portion 42d of the introduction pipe 42 is inserted into the filter member 48 from the left side. It is attached to the tip of the introduction tube 42 so that it can be inserted from the side. In the state shown in FIG. 10, the right end of the mounting portion 42d of the introduction pipe 42 is in contact with the cylindrical portion 50b of the filter mounting member 50, and the left end of the filter member 48 is in contact with the stepped portion 42e of the introduction pipe 42. there is

When the oil pump 34 (see FIG. 4) sucks the lubricating oil from the introducing pipe 42 with the filter member 48 and the filter mounting member 50 attached to the introducing pipe 42, the lubricating oil in the oil tank 32 is removed from the filter member 48. , into the inflow space 50i, and into the introduction pipe 42 through the flow path 50h. At this time, the filter member 48 can prevent impurities such as chips that have entered the oil tank 32 from flowing into the introduction pipe 42 .

(Modification)
The chainsaw 2 may be powered via the power cord without the battery pack B attached.

The motor 30 may be an outer rotor type DC brushless motor. Alternatively, motor 30 may be a brushed motor or other type of electric motor.

The chain saw 2 may be provided with an internal combustion engine instead of the motor 30 as a prime mover for rotating the sprocket 38 . In this case, the engine may be driven to rotate the output shaft 36 connected to the sprocket 38 .

As shown in FIG. 12, the holding portion 50d of the filter mounting member 50 may have three or more chamfered portions 50k. Also, the chamfered portion 50k may not be arranged symmetrically with respect to the central axis of the cylindrical portion 50j.

Filter member 48 may not be a coil spring. The filter member 48 has a substantially cylindrical shape and may be another type of filter member that is elastically deformable in the radial direction.

As described above, in one or more embodiments, the filter 52 has a generally cylindrical shape and includes a radially elastically deformable filter member 48 and a holding portion 50d capable of holding the filter member 48. and a flow path 50h through which lubricating oil (an example of fluid) passes, and a flow path member 54 fixed to the support member 56 is provided. When the filter member 48 is attached to the support member 56, the channel 50h communicates with the inflow space 50i inside the filter member 48. As shown in FIG. The outermost diameter of the holding portion 50d is larger than the inner diameter of the filter member 48 when no load is applied. When the filter member 48 is attached to the support member 56, the outer surface of the holding portion 50d is partially in contact with the inner surface of the filter member 48 (for example, the cylindrical portion 50j) in the circumferential direction, and the remaining portion (for example, the chamfered portion 50k) is in contact with the inner surface of the filter member 48. ) is not in contact with the inner surface of the filter member 48 .

In the above configuration, the filter member 48 is attached to the holding portion 50d in a state in which the diameter of the filter member 48 is expanded as compared to when no load is applied. , so that the filter member 48 can be firmly attached to the support member 56 . In the above configuration, the outer surface of the holding portion 50d is partially in contact with the inner surface of the filter member 48 in the circumferential direction, and the remaining portion is not in contact with the inner surface of the filter member 48. When the filter member 48 is attached to the support member 56, it is not necessary to expand the diameter of the filter member 48 over the entire circumference. be able to. With such a configuration, the work of attaching the filter member 48 to the support member 56 can be easily performed.

In one or more embodiments, the retaining portion 50d has at least two chamfers 50k. The outer surface of the holding portion 50d does not contact the inner surface of the filter member 48 at at least two chamfered portions 50k.

In the above configuration, since the inner surface of the filter member 48 and the outer surface of the holding portion 50d do not abut on at least two chamfered portions 50k, the work of attaching the filter member 48 to the support member 56 can be performed more easily.

In one or more embodiments, filter member 48 is a coil spring.

According to the above configuration, by using a coil spring that is inexpensive and readily available as the filter member 48, the manufacturing cost of the filter 52 can be further reduced.

In one or more embodiments, support member 56 further comprises a stop 50e positioned axially of filter member 48 adjacent retainer 50d. The outer diameter of the locking portion 50e is smaller than the outermost diameter of the holding portion 50d.

In the above configuration, when the filter member 48 is attached to the support member 56, part of the filter member 48 enters the locking portion 50e. At this time, since the outer diameter of the engaging portion 50e is smaller than the outermost diameter of the holding portion 50d, the inner diameter of the filter member 48 that has entered the engaging portion 50e is smaller than the outermost diameter of the holding portion 50d. This causes the filter member 48 and support member 56 to engage. With such a configuration, it is possible to prevent the filter member 48 from unexpectedly coming off the support member 56 .

In one or more embodiments, support member 56 and channel member 54 are integrally formed.

According to the above configuration, the number of parts of the filter 52 can be reduced.

In one or more embodiments, the fluid is lubricating oil used in chainsaw 2 .

According to the above configuration, in the lubricating oil filter 52 used in the chain saw 2, the filter member 48 can be firmly attached to the support member 56, and the work of attaching the filter member 48 to the support member 56 can be facilitated. It can be carried out.

In one or more embodiments, the chainsaw 2 includes a saw chain 8, a guide bar 6 to which the saw chain 8 is attached, a sprocket 38 that runs the saw chain 8 along the circumference of the guide bar 6, and a sprocket A motor 30 (example of prime mover) having an output shaft 36 connected to 38, an oil pump 34 connected to the output shaft 36, an oil tank 32 that stores lubricating oil, and lubrication from the oil tank 32 to the oil pump 34. An introduction pipe 42 for sending oil, an introduction pipe 44 for sending lubricating oil from the oil pump 34 to the guide bar 6, and a filter 52 provided in the introduction pipe 42 inside the oil tank 32 are provided. The filter 52 has a substantially cylindrical shape and includes a radially elastically deformable filter member 48, a support member 56 having a holding portion 50d capable of holding the filter member 48, and lubricating oil (example of fluid). A channel member 54 fixed to a support member 56 is provided with a channel 50h passing therethrough. When the filter member 48 is attached to the support member 56, the channel 50h communicates with the inflow space 50i inside the filter member 48. As shown in FIG. The outermost diameter of the holding portion 50d is larger than the inner diameter of the filter member 48 when no load is applied. When the filter member 48 is attached to the support member 56, the outer surface of the holding portion 50d is partially in contact with the inner surface of the filter member 48 (for example, the cylindrical portion 50j) in the circumferential direction, and the remaining portion (for example, the chamfered portion 50k) is in contact with the inner surface of the filter member 48. ) is not in contact with the inner surface of the filter member 48 .

2: Chain saw 4: Body 6: Guide bar 8: Saw chain 10: Body housing 10a: Adjustment opening 12: Rear handle 14: Rear hand guard 16: Front handle 18: Front hand guard 20: Sprocket cover 22: Power supply Button 24 : Trigger lever 26 : Lock lever 28 : Control unit 30 : Motor 32 : Oil tank 32a : Replenishment opening 32b : Through hole 34 : Oil pump 36 : Output shaft 38 : Sprocket 40 : Cap 42 : Introduction pipe 42a : Seal Portion 42b: Skirt portion 42c: Flange portion 42d: Mounting portion 42e: Stepped portion 44: Outlet pipe 46: Adjustment pin 48: Filter member 50: Filter mounting member 50a: Insertion portion 50b: Cylindrical portion 50c: Inflow portion 50d: Holding portion 50e: Locking portion 50f: Disk portion 50g: Retainer 50h: Flow path 50i: Inflow space 50j: Cylindrical portion 50k: Chamfered portion 52: Filter 54: Flow path member 56: Support member

Claims (7)

is a filter,
a filter member having a substantially cylindrical shape and being elastically deformable in a radial direction;
a support member including a holding portion capable of holding the filter member;
comprising a flow path through which a fluid passes, and a flow path member fixed to the support member;
When the filter member is attached to the support member, the flow path communicates with a space inside the filter member,
an outermost diameter of the holding portion is larger than an inner diameter of the filter member when no load is applied;
When the filter member is attached to the support member, the outer surface of the holding portion is partially in contact with the inner surface of the filter member and the remaining portion is in contact with the inner surface of the filter member in the circumferential direction. No filters. the retainer has at least two chamfers,
2. The filter of claim 1, wherein the outer surface of the retaining portion does not abut the inner surface of the filter member at the at least two chamfers. 3. The filter of claim 1 or 2, wherein said filter member is a coil spring. The support member further includes a locking portion arranged adjacent to the holding portion in the axial direction of the filter member,
4. The filter according to any one of claims 1 to 3, wherein the locking portion has an outer diameter smaller than the outermost diameter of the holding portion. 5. The filter according to any one of claims 1 to 4, wherein said support member and said channel member are integrally formed. 6. A filter according to any preceding claim, wherein the fluid is lubricating oil used in chain saws. is a chainsaw,
a saw chain;
a guide bar to which the saw chain is attached;
a sprocket for running the saw chain along the periphery of the guide bar;
a prime mover comprising an output shaft coupled to the sprocket;
an oil pump coupled to the output shaft;
an oil tank that stores lubricating oil;
an introduction pipe for sending the lubricating oil from the oil tank to the oil pump;
a lead-out pipe for sending the lubricating oil from the oil pump to the guide bar;
A filter provided in the introduction pipe inside the oil tank,
the filter is
a filter member having a substantially cylindrical shape and being elastically deformable in a radial direction;
a support member including a holding portion capable of holding the filter member;
comprising a flow path through which a fluid passes, and a flow path member fixed to the support member;
When the filter member is attached to the support member, the flow path communicates with a space inside the filter member,
an outermost diameter of the holding portion is larger than an inner diameter of the filter member when no load is applied;
When the filter member is attached to the support member, the outer surface of the holding portion is partially in contact with the inner surface of the filter member and the remaining portion is in contact with the inner surface of the filter member in the circumferential direction. No chainsaw.

Images