Filter and chainsaw

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

[0001] The technology disclosed in this specification relates to a filter and a chainsaw.

Background Art

[0002] Patent Document 1 discloses a chainsaw. The chainsaw includes a saw chain, a guide bar to which the saw chain is attached, a sprocket that runs the saw chain along the periphery of the guide bar, a prime mover having an output shaft connected to the sprocket, an oil pump connected to the output shaft, an oil tank for storing lubricating oil, an introduction pipe that sends the lubricating oil from the oil tank to the oil pump, a lead-out pipe that sends the lubricating oil from the oil pump to the guide bar, and a filter provided in the introduction pipe inside the oil tank. The filter includes a filter member, a support member having a holding portion capable of holding the filter member, a flow path through which 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 the space inside the filter member.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] When manufacturing a filter as described above, it is necessary that the filter member can be firmly attached to the support member and that the attachment work of the filter member to the support member can be easily performed. This specification provides a technology that can firmly attach the filter member to the support member and can easily perform the attachment work of the filter member to the support member.

Means for Solving the Problem

[0005] This specification discloses a filter. The filter includes a filter member having a substantially cylindrical shape and being elastically deformable in the radial direction, a support member having a holding portion capable of holding the filter member, and a flow path through which fluid passes, and may further include a flow path member fixed to the support member. When the filter member is attached to the support member, the flow path may communicate with the internal space of the filter member. The outermost diameter of the holding portion may be larger than the inner diameter of the filter member when it is unloaded. When the filter member is attached to the support member, a part of the outer surface of the holding portion may be in contact with the inner surface of the filter member in the circumferential direction, and the remaining part may not be in contact with the inner surface of the filter member.

[0006] In the above configuration, since the filter member is attached to the holding portion in a state where its diameter is expanded compared to when it is unloaded, the inner surface of the filter member is strongly pressed against the outer surface of the holding portion by the elastic restoring force of the filter member, and the filter member can be firmly attached to the support member. Also, in the above configuration, since a part of the outer surface of the holding portion is in contact with the inner surface of the filter member in the circumferential direction and the remaining part is not in contact with the inner surface of the filter member, when attaching the filter member to the support member, it is not necessary to expand the diameter of the filter member over the entire circumference, and by partially expanding the diameter of the filter member, the inner surface of the filter member can be brought into contact with the outer surface of the holding portion. By adopting such a configuration, the operation of attaching the filter member to the support member can be easily performed.

[0007] This specification also discloses a chainsaw. The chainsaw includes a saw chain, a guide bar to which the saw chain is attached, a sprocket that runs the saw chain along the periphery of the guide bar, a prime mover having an output shaft 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 from the oil pump to the guide bar, and a filter provided in the introduction pipe inside the oil tank. The filter may have a substantially cylindrical shape and include a filter member that is elastically deformable in the radial direction, a support member having a holding portion capable of holding the filter member, a flow path through which 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 may communicate with the space inside the filter member. The outermost diameter of the holding portion may be larger than the inner diameter of the filter member when no load is applied. When the filter member is attached to the support member, a part of the outer surface of the holding portion may be in contact with the inner surface of the filter member in the circumferential direction, and the remaining part may not be in contact with the inner surface of the filter member.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Mode for Carrying Out the Invention

[0009] Hereinafter, representative and non-limiting specific examples of the present invention will be described in detail with reference to the drawings. This detailed description is merely intended to show those skilled in the art the details for implementing preferred examples of the present invention and is not intended to limit the scope of the present invention. In addition, the additional features and inventions disclosed below can be used separately or together with other features and inventions in order to provide further improved filters, chain saws, their manufacturing methods, and usage methods.

[0010] Also, the combinations of features and steps disclosed in the following detailed description are not essential for implementing the present invention in the broadest sense and are described only for the purpose of explaining representative specific examples of the present invention in particular. Furthermore, the various features of the above and below representative specific examples, as well as the various features described in the independent and dependent claims, do not have to be combined as described in the specific examples here or in the order listed when providing additional and useful embodiments of the present invention.

[0011] All features described in this specification and / or the claims are intended to be disclosed separately and independently of each other, as limitations to the original disclosure and the claimed subject matter, apart from the configuration of the features described in the embodiments and / or claims. Further, all descriptions regarding numerical ranges and groups or sets are made with the intention of disclosing intermediate configurations as limitations to the original disclosure and the claimed subject matter.

[0012] In one or more embodiments, the filter has a substantially cylindrical shape and includes a filter member that is elastically deformable in the radial direction, a support member having a holding portion capable of holding the filter member, and a flow path through which fluid passes, and may include a flow path member fixed to the support member. When the filter member is attached to the support member, the flow path may communicate with the space inside the filter member. The outermost diameter of the holding portion may be larger than the inner diameter of the filter member when it is unloaded. When the filter member is attached to the support member, a part of the outer surface of the holding portion may be in contact with the inner surface of the filter member in the circumferential direction, and the remaining part may not be in contact with the inner surface of the filter member.

[0013] In the above configuration, since the filter member is attached to the holding portion in a state where its diameter is expanded compared to when it is unloaded, the inner surface of the filter member is strongly pressed against the outer surface of the holding portion by the elastic restoring force of the filter member, and the filter member can be firmly attached to the support member. Also, in the above configuration, since a part of the outer surface of the holding portion is in contact with the inner surface of the filter member in the circumferential direction and the remaining part is not in contact with the inner surface of the filter member, when attaching the filter member to the support member, it is not necessary to expand the diameter of the filter member over the entire circumference, and by partially expanding the diameter of the filter member, the inner surface of the filter member can be brought into contact with the outer surface of the holding portion. By adopting such a configuration, the operation of attaching the filter member to the support member can be easily performed.

[0014] In one or more embodiments, the holding portion may have at least two chamfered portions. 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.

[0015] In the above configuration, in at least two chamfered portions, since the inner surface of the filter member and the outer surface of the holding portion are not in contact, the operation of attaching the filter member to the support member can be performed more easily.

[0016] In one or more embodiments, the filter member may be a coil spring.

[0017] According to the above configuration, by using an inexpensive and easily available coil spring as the filter member, the manufacturing cost of the filter can be further reduced.

[0018] In one or more embodiments, the support member may further include a locking portion disposed adjacent to the holding portion in the axial direction of the filter member. The outer diameter of the locking portion may be smaller than the outermost diameter of the holding portion.

[0019] In the above configuration, when the filter member is attached to the support member, a 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 that has entered the locking portion becomes smaller than the outermost diameter of the holding portion. As a result, the filter member and the support member are engaged. By adopting such a configuration, it is possible to prevent the filter member from accidentally coming off the support member.

[0020] In one or more embodiments, the support member and the flow path member may be integrally formed.

[0021] According to the above configuration, the number of parts of the filter can be reduced.

[0022] In one or more embodiments, the fluid may be a lubricating oil used in a chainsaw.

[0023] According to the above configuration, in a filter for a lubricating oil used in a chainsaw, the filter member can be firmly attached to the support member, and the attachment work of the filter member to the support member can be easily performed.

[0024] In one or more embodiments, the chainsaw may include a saw chain, a guide bar to which the saw chain is attached, a sprocket that runs the saw chain along the periphery of the guide bar, a prime mover having an output shaft 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 from the oil pump to the guide bar, and a filter provided in the introduction pipe inside the oil tank. The filter has a substantially cylindrical shape and includes a filter member that can be elastically deformed in the radial direction, a support member having a holding portion capable of holding the filter member, a flow path through which 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 may communicate with a space inside the filter member. The outermost diameter of the holding portion may be larger than the inner diameter of the filter member when no load is applied. When the filter member is attached to the support member, a part of the outer surface of the holding portion may be in contact with the inner surface of the filter member in the circumferential direction, and the remaining part may not be in contact with the inner surface of the filter member.

[0025] (Example) As shown in FIGS. 1 and 2, the chainsaw 2 of this embodiment includes a main body 4, a guide bar 6, and a saw chain 8. The guide bar 6 is an elongated plate-shaped member attached to the main body 4 so as to protrude forward from the main body 4. The saw chain 8 includes a plurality of cutters connected to each other and is attached along the peripheral edge of the guide bar 6. A battery pack B is detachably attached to the main body 4. The chainsaw 2 cuts a workpiece such as wood by rotationally driving the saw chain 8 along the peripheral edge of the guide bar 6 with the power supplied from the battery pack B. In the following description, as shown in FIG. 3, when the chainsaw 2 is placed on a horizontal placement surface S such as the ground, the direction perpendicular to the placement surface S is referred to as the vertical direction of the chainsaw 2, the direction in which the longitudinal direction of the guide bar 6 is projected onto the placement surface S is referred to as the front-rear direction of the chainsaw 2, and the direction perpendicular to the vertical direction and the front-rear direction of the chainsaw 2 is referred to as the left-right direction of the chainsaw 2. In addition, in the drawings other than FIGS. 1-3, the illustration of the saw chain 8 is omitted for clarity of illustration.

[0026] As shown in FIG. 1, the main body 4 includes a main body housing 10, a rear handle 12 disposed behind the main body housing 10 and grippable by the user with one hand, a rear hand guard 14 for protecting the hand of the user holding the rear handle 12, a front handle 16 disposed in front of the rear handle 12 and grippable by the user with the other hand, a front hand guard 18 for protecting the hand of the user holding the front handle 16, and a sprocket cover 20 detachably attached to the front right portion of the main body housing 10. On the upper surface near the front end of the rear handle 12, a power button 22 for the user to switch the on / off of the power of the chainsaw 2 is disposed. Also, on the lower surface near the front end of the rear handle 12, a trigger lever 24 for the user to operate the rotational drive of the saw chain 8 is disposed. Further, on the upper surface of the rear handle 12, a lock lever 26 that switches between a state allowing the user to operate the trigger lever 24 and a prohibited state is disposed. When using the chainsaw 2, the user holds the rear handle 12 with the right hand and the front handle 16 with the left hand to hold the chainsaw 2. From this state, when the user presses down the lock lever 26 of the rear handle 12 with the palm of the right hand, the operation of the trigger lever 24 by the user is permitted. In this state, when the user pulls up the trigger lever 24 with the index finger of the right hand, the saw chain 8 is rotationally driven.

[0027] As shown in FIG. 4, inside the main body housing 10, a control unit 28, a motor 30, an oil tank 32, and an oil pump 34 are disposed. The motor 30 is, for example, an inner rotor type DC brushless motor. The control unit 28 includes an inverter circuit having 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 in response to the operation of the trigger lever 24 by the user.

[0028] As shown in FIG. 5, a sprocket 38 is fixed to the output shaft 36 of the motor 30. The sprocket 38 is exposed outside the main body housing 10 and is covered on the outside by a sprocket cover 20 (see FIG. 1). A timing chain 8 (see FIG. 1) is bridged from the guide bar 6 to the sprocket 38. When the motor 30 is driven, the sprocket 38 rotates together with the output shaft 36, whereby the timing chain 8 rotates around the sprocket 38 and the guide bar 6.

[0029] The front hand guard 18 is rotatable relative to the main 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 mechanically brakes the rotation of the output shaft 36 when the front hand guard 18 is in the stop position, thereby braking the rotation of the timing chain 8.

[0030] The oil tank 32 shown in FIG. 4 stores lubricating oil for lubricating the timing chain 8. The oil tank 32 is formed with a replenishing opening 32a for replenishing the lubricating oil. A cap 40 is detachably attached to the replenishing opening 32a. As shown in FIG. 2, the cap 40 of the oil tank 32 is disposed on the left surface of the front portion of the main body housing 10 and is exposed outside the main body housing 10.

[0031] As shown in FIG. 4, the oil pump 34 is connected to the output shaft 36 of the motor 30. The oil pump 34 sucks out the lubricating oil inside the oil tank 32 through the inlet 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 inlet pipe 42 and the outlet pipe 44 are flexible tubular members made of a rubber material such as nitrile rubber or silicone rubber. Note that the outlet pipe 44 may be made of a resin material such as soft vinyl chloride. The lubricating oil sent to the outlet pipe 44 is supplied to the guide bar 6 and the saw chain 8 (see FIG. 1). The discharge amount of the lubricating oil supplied from the oil tank 32 to the guide bar 6 by the oil pump 34 can be adjusted via the adjustment pin 46.

[0032] As shown in FIG. 2, an adjustment opening 10a through which the adjustment pin 46 can be accessed from the outside is formed on the lower surface of the main body housing 10. The user can adjust the discharge amount of the lubricating oil in the oil pump 34 by inserting a tool through the adjustment opening 10a and rotating the adjustment pin 46. In the left-right direction of the chainsaw 2, the adjustment opening 10a is disposed near the left end of the main body housing 10.

[0033] As shown in FIG. 4, the tip of the introduction pipe 42 penetrates through a through hole 32b formed near the lower rear end of the oil tank 32 and is inserted into the oil tank 32. As shown in FIG. 6, a seal portion 42a, a skirt portion 42b, and a flange portion 42c are formed on the introduction pipe 42. 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 (see FIG. 4) of the oil tank 32. The skirt portion 42b is disposed closer to the tip of the introduction pipe 42 than the seal portion 42a. The skirt portion 42b has a substantially frustum-shaped outer shape that expands in diameter as it moves away from the tip of the introduction pipe 42. 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 disposed 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 elastically deforms and passes through the through hole 32b, and then the seal portion 42a elastically deforms and fits into the through hole 32b. As a result, the skirt portion 42b abuts against the inner surface of the oil tank 32, and the flange portion 42c abuts against the outer surface of the oil tank 32, and the through hole 32b is sealed by the seal portion 42a.

[0034] Inside the oil tank 32, a filter 52 is attached to the tip of the introduction pipe 42. The filter 52 includes a filter member 48 and a filter attachment member 50. As shown in FIG. 6, at the tip of the introduction pipe 42, an attachment portion 42d and a step portion 42e are formed. The attachment portion 42d has a substantially frustum-shaped outer shape that expands in diameter as it moves away from the tip of the introduction pipe 42. The step portion 42e is disposed on the side farther from the tip of the introduction pipe 42 than the attachment portion 42d. The step portion 42e has a substantially cylindrical outer shape. The outer diameter of the step portion 42e is slightly larger than the maximum outer diameter of the attachment portion 42d. The filter member 48 has a substantially cylindrical shape and is elastically deformable in the radial and axial directions. The filter member 48 is, for example, a coil spring made of a metal material such as hard steel wire, piano wire, or stainless steel, and suppresses the passage of impurities larger than the gaps between the wire rods when the lubricating oil passes through the gaps between the wire rods wound in a spiral shape. The axial dimension of the filter member 48 is, for example, about 5-50 mm, the radial dimension of the filter member 48 is, for example, about 3-10 mm, and the diameter of the wire rod of the filter member 48 is, for example, about 0.5 mm. As shown in FIG. 7, when the filter 52 is attached to the tip of the introduction pipe 42, the filter member 48 is disposed near the rear lower end inside the oil tank 32 such that the axial direction is along the left-right direction.

[0035] 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 disc portion 50f. The insertion portion 50a, the cylindrical portion 50b, the inflow portion 50c, the holding portion 50d, the locking portion 50e, and the disc portion 50f are integrally formed without joints. The filter mounting member 50 is made of a resin material such as polyacetal. A plurality of anti-slip portions 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 penetrating the inflow portion 50c from one side surface to the other side surface is formed in the inflow portion 50c. 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 the present embodiment, the holding portion 50d includes two chamfered portions 50k symmetrically arranged 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 locking portion 50e (i.e., the dimension in the direction along the central axis of the locking portion 50e) is larger than the diameter of the wire of the filter member 48, and has a dimension of about 1.5 to 2 times the diameter of the wire of the filter member 48, for example, about 0.75 mm. The disc portion 50f has a substantially disc shape. The outer diameter of the disc portion 50f is larger than the outer diameter of the cylindrical portion 50b and larger than the outer diameter of the cylindrical portion 50j. Hereinafter, the insertion portion 50a and the cylindrical portion 50b of the filter mounting member 50 are also collectively referred to as a flow path member 54, and the inflow portion 50c, the holding portion 50d, the locking portion 50e, and the disc portion 50f of the filter mounting member 50 are also collectively referred to as a support member 56. The flow path member 54 and the support member 56 are integrally formed.

[0036] As shown in FIG. 10, a filter mounting member 50 is inserted into the filter member 48 from the right. In a state where the filter member 48 is attached to the filter mounting member 50, the right end of the filter member 48 abuts against the disk portion 50f of the filter mounting member 50. Since the outermost diameter of the holding portion 50d of the filter mounting member 50 (i.e., the outer diameter of the cylindrical portion 50j) is larger than the inner diameter of the filter member 48, in the vicinity of the holding portion 50d, the inner surface of the filter member 48 is pressed against the outer surface of the cylindrical portion 50j in a state where the filter member 48 is elastically expanded in diameter. Thereby, the filter member 48 can be firmly attached to the filter mounting member 50.

[0037] As shown in FIG. 11, although the outer surface of the cylindrical portion 50j of the holding portion 50d abuts against the inner surface of the filter member 48, the outer surface of the chamfered portion 50k of the holding portion 50d does not abut against the inner surface of the filter member 48. The ratio occupied by the cylindrical portion 50j in the entire circumference of the filter mounting member 50, for example, the ratio of the angular range of the cylindrical portion 50j with respect to the entire circumference of 360° of the filter mounting member 50, is within a range of, for example, 50% (corresponding to 180°) - 78% (corresponding to 280°), and is, for example, 67% (corresponding to 240°). With such a configuration, the operation of attaching the filter member 48 to the filter mounting member 50 can be easily performed. In FIG. 11, for clarity of illustration, the filter member 48 is illustrated by an annular ring having a width in the radial direction.

[0038] As shown in FIG. 10, in a state where the filter member 48 is attached to the filter mounting 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, whereby the filter member 48 engages with the filter mounting member 50. For example, when the filter member 48 is a coil spring and the width of the locking portion 50e (for example, 0.75 mm) is about 1.5 times the diameter of the wire of the filter member 48 (for example, 0.5 mm), one wire at the end of the filter member 48 enters the locking portion 50e, and the filter member 48 engages with the filter mounting member 50. Therefore, it is possible to prevent the filter member 48 from accidentally coming off the filter mounting member 50.

[0039] The filter mounting member 50 to which the filter member 48 is attached is attached to the tip of the introduction pipe 42 such that the insertion portion 50a of the filter mounting member 50 is inserted into the inside of the mounting portion 42d from the right, and the mounting portion 42d of the introduction pipe 42 is inserted into the inside of the filter member 48 from the left. In the state shown in FIG. 10, the right end of the mounting portion 42d of the introduction pipe 42 abuts against the cylindrical portion 50b of the filter mounting member 50, and the left end of the filter member 48 abuts against the stepped portion 42e of the introduction pipe 42.

[0040] When the oil pump 34 (see FIG. 4) sucks lubricating oil from the introduction pipe 42 with the filter member 48 and the filter mounting member 50 attached to the introduction pipe 42, the lubricating oil in the oil tank 32 passes through the filter member 48 and flows into the inflow space 50i, and then flows into the introduction pipe 42 through the flow path 50h. At this time, the filter member 48 can suppress impurities such as chips that have entered the oil tank 32 from flowing into the introduction pipe 42.

[0041] (Modification example) The chainsaw 2 may be supplied with power via a power cord without attaching the battery pack B.

[0042] The motor 30 may be an outer rotor type DC brushless motor. Alternatively, the motor 30 may be a brushed motor or another type of electric motor.

[0043] The chainsaw 2 may be provided with an engine having an internal combustion engine as a prime mover for rotating the sprocket 38 instead of the motor 30. In this case, the output shaft 36 connected to the sprocket 38 may be rotated by driving the engine.

[0044] As shown in FIG. 12, the holding portion 50d of the filter mounting member 50 may include three or more chamfered portions 50k. Further, the chamfered portions 50k may not be arranged symmetrically with respect to the central axis of the cylindrical portion 50j.

[0045] The filter member 48 does not have to be a coil spring. The filter member 48 may be another type of filter member having a substantially cylindrical shape and being elastically deformable in the radial direction.

[0046] As described above, in one or more embodiments, the filter 52 includes a filter member 48 having a substantially cylindrical shape and being elastically deformable in the radial direction, a support member 56 having a holding portion 50d capable of holding the filter member 48, a flow path 50h through which lubricating oil (an example of a fluid) passes, and a flow path member 54 fixed to the support member 56. When the filter member 48 is attached to the support member 56, the flow path 50h communicates with an inflow space 50i inside the filter member 48. The outermost diameter of the holding portion 50d is larger than the inner diameter of the filter member 48 when it is unloaded. When the filter member 48 is attached to the support member 56, a part (for example, the cylindrical portion 50j) of the outer surface of the holding portion 50d is in contact with the inner surface of the filter member 48 in the circumferential direction, and the remaining part (for example, the chamfered portion 50k) is not in contact with the inner surface of the filter member 48.

[0047] In the above configuration, since the filter member 48 is attached to the holding portion 50d in a state where its diameter is expanded more than when it is unloaded, the inner surface of the filter member 48 is strongly pressed against the outer surface of the holding portion 50d by the elastic restoring force of the filter member 48, and the filter member 48 can be firmly attached to the support member 56. Further, in the above configuration, since a part of the outer surface of the holding portion 50d is in contact with the inner surface of the filter member 48 in the circumferential direction and the remaining part is not in contact with the inner surface of the filter member 48, when attaching the filter member 48 to the support member 56, it is not necessary to expand the diameter of the filter member 48 over the entire circumference, and by partially expanding the diameter of the filter member 48, the inner surface of the filter member 48 can be brought into contact with the outer surface of the holding portion 50d. By adopting such a configuration, the work of attaching the filter member 48 to the support member 56 can be easily performed.

[0048] In one or more embodiments, the holding portion 50d has at least two chamfered portions 50k. In the at least two chamfered portions 50k, the outer surface of the holding portion 50d does not contact the inner surface of the filter member 48.

[0049] In the above configuration, in the at least two chamfered portions 50k, since the inner surface of the filter member 48 and the outer surface of the holding portion 50d do not contact each other, the work of attaching the filter member 48 to the support member 56 can be performed more easily.

[0050] In one or more embodiments, the filter member 48 is a coil spring.

[0051] According to the above configuration, by using an inexpensive and easily available coil spring as the filter member 48, the manufacturing cost of the filter 52 can be further reduced.

[0052] In one or more embodiments, the support member 56 further includes a locking portion 50e disposed adjacent to the holding portion 50d in the axial direction of the filter member 48. The outer diameter of the locking portion 50e is smaller than the outermost diameter of the holding portion 50d.

[0053] In the above configuration, when the filter member 48 is attached to the support member 56, a part of the filter member 48 enters the locking portion 50e. At this time, since the outer diameter of the locking 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 locking portion 50e becomes smaller than the outermost diameter of the holding portion 50d. As a result, the filter member 48 and the support member 56 are engaged. By adopting such a configuration, it is possible to prevent the filter member 48 from accidentally coming off the support member 56.

[0054] In one or more embodiments, the support member 56 and the flow path member 54 are integrally formed.

[0055] According to the above configuration, the number of parts of the filter 52 can be reduced.

[0056] In one or more embodiments, the fluid is a lubricating oil used in the chainsaw 2.

[0057] According to the above configuration, in the filter 52 for the lubricating oil used in the chainsaw 2, the filter member 48 can be firmly attached to the support member 56, and the attachment operation of the filter member 48 to the support member 56 can be easily performed.

[0058] 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 periphery of the guide bar 6, a motor 30 (an example of a prime mover) including an output shaft 36 connected to the sprocket 38, an oil pump 34 connected to the output shaft 36, an oil tank 32 that stores lubricating oil, an introduction pipe 42 that sends the lubricating oil from the oil tank 32 to the oil pump 34, a discharge pipe 44 that sends the 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. The filter 52 has a substantially cylindrical shape and includes a filter member 48 that is elastically deformable in the radial direction, a support member 56 that can hold the filter member 48, a flow path 50h through which the lubricating oil (an example of a fluid) passes, and a flow path member 54 fixed to the support member 56. When the filter member 48 is attached to the support member 56, the flow path 50h communicates with the inflow space 50i inside the filter member 48. The outermost diameter of the holding portion 50d is larger than the inner diameter of the filter member 48 when it is unloaded. When the filter member 48 is attached to the support member 56, the outer surface of the holding portion 50d is in contact with the inner surface of the filter member 48 in part (for example, the cylindrical portion 50j) in the circumferential direction, and the remaining portion (for example, the chamfered portion 50k) is not in contact with the inner surface of the filter member 48.

Description of Reference Numerals

[0059] 2: Chainsaw 4: Main body 6: Guide bar 8: Saw chain 10: Body housing 10a: Adjustment opening 12: Rear handle 14: Rear handle guard 16: Front handle 18: Front handle guard 20: Sprocket cover 22: Power button 24: Trigger lever 26: Lock lever 28: Control unit 30: Motor 32: Oil tank 32a: Refill opening 32b: Through hole 34: Oil pump 36: Output shaft 38: Sprocket 40: Cap 42: Introduction pipe 42a: Seal part 42b: Skirt part 42c: Flange part 42d: Mounting part 42e: Step part 44: Outlet pipe 46: Adjustment pin 48: Filter member 50: Filter mounting member 50a: Insertion part 50b: Cylindrical part 50c: Inlet part 50d: Holding part 50e: Locking part 50f: Disk part 50g: Anti-drop 50h: Flow path 50i: Inlet space 50j: Cylindrical part 50k: Chamfered part 52: Filter 54: Flow path member 56: Support member

Claims

1. A filter comprising: a filter member having a substantially cylindrical shape and being elastically deformable in the radial direction; a support member having a holding portion capable of holding the filter member; 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, the outermost diameter of the holding portion is larger than the inner diameter of the filter member when no load is applied, a filter in which, when the filter member is attached to the support member, a part of the outer surface of the holding portion is in contact with the inner surface of the filter member in the circumferential direction, and the remaining part is not in contact with the inner surface of the filter member.

2. the holding portion has at least two chamfered portions, the filter according to claim 1, wherein in the at least two chamfered portions, the outer surface of the holding portion is not in contact with the inner surface of the filter member.

3. the filter according to claim 1 or 2, wherein the filter member is a coil spring.

4. the support member further comprises a locking portion disposed adjacent to the flow path member of the holding portion on the side opposite to the axial direction of the filter member, the filter according to any one of claims 1 to 3, wherein the outer diameter of the locking portion is smaller than the outermost diameter of the holding portion.

5. the filter according to any one of claims 1 to 4, wherein the support member and the flow path member are integrally formed.

6. the filter according to any one of claims 1 to 5, wherein the fluid is a lubricating oil used in a chainsaw.

7. A chainsaw comprising: a saw chain, A guide bar to which the saw chain is attached, A sprocket that runs the saw chain along the periphery of the guide bar, A prime mover including an output shaft 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 from the oil pump to the guide bar, Comprising 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 the radial direction, A support member including a holding portion capable of holding the filter member, Comprising a flow path through which 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 the space inside the filter member, The outermost diameter of the holding portion is larger than the inner diameter of the filter member when there is no load, A chainsaw in which, when the filter member is attached to the support member, a part of the outer surface of the holding portion is in contact with the inner surface of the filter member in the circumferential direction, and the remaining part is not in contact with the inner surface of the filter member.

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