Shaft seal unit

Abstract

To provide a shaft seal unit with excellent sealing properties, low friction, long life and simple structure. [Solution] A shaft seal unit 1 for a rotating body shaft comprising an outer peripheral part 2 with a cylindrical cavity 4 having a circular cross section, and a cylindrical rotating shaft driven member 6 arranged within the cylindrical cavity, wherein the outer peripheral part has a seal member 3 on the inner peripheral surface 5 of the cylindrical cavity, the inner peripheral surface 8 of the seal member abutting the outer peripheral surface of the cylindrical rotating shaft driven member, which has a rotating shaft insertion hole 9 at its center, and which is for regulating the movement of powder between the cylindrical rotating shaft driven member that follows the rotation of the rotating shaft and the outer peripheral part.

Description

Technical Field

[0001] This application relates to a shaft sealing mechanism and a shaft sealing unit for sealing the shaft end portion of a rotating body. For example, in a rotating device that handles powder, a cylindrical shaft sealing material that seals so that powder does not leak to the outside from the end portion of the rotating shaft of the rotating body, particularly, from the rotating shafts such as the toner supply roller and the agitation roller of an image forming apparatus in an electrophotographic apparatus, the present invention relates to a shaft sealing mechanism and a shaft sealing unit that seal the shaft end portion of the rotating body so that toner powder does not leak.

Background Art

[0002] In a rotating device that handles powder, leakage of powder to the outside from the end portion of the rotating shaft of the rotating body causes various problems. Then, it causes locking due to adhesion, an increase in rotational torque, a decrease in life, and the like. Therefore, as a cylindrical shaft sealing material for sealing so that powder does not leak to the outside, rubber-based sealing members such as oil seals, sponge-based sealing members, or felt-based sealing members have been used heretofore.

[0003] However, the rubber-based sealing member has viscoelasticity and a high coefficient of friction. Therefore, when it rotates at high speed, frictional heat is generated, the sealing performance deteriorates due to wear, and there has been a problem with the life. Further, in the case of powder made of resin such as toner in an electrophotographic apparatus, as the frictional heat is generated, the powder to be sealed softens due to the frictional heat and adheres to the rotating shaft, causing a problem of locking the apparatus. Also, in the case of a sealing member that contacts the rotating body on a surface, there has been a problem that the torque increases and the life of the apparatus is shortened.

[0004] Sponge-based sealing members have air bubble holes in the sealing member and are generally used after being compressed. However, if powder enters the air bubble holes of the sealing member, the sealing performance will deteriorate. Also, in the case of sponge-based sealing members, similar to the case of rubber sealing members, when the powder is toner, at high speeds of rotation, the resin of the toner that has entered the holes of the sealing member due to frictional heat softens and adheres to the rotating shaft, locking the rotating shaft of the rotating device. There was such a problem.

[0005] In felt-based sealing members, felt made by compressing fibers is used. Since the direction of the fibers is irregular, when powder begins to enter between the fibers inside the seal, it becomes difficult to regulate the entry of the powder, and there has been a problem that the sealing performance easily deteriorates.

[0006] Also, in a shaft seal material formed by shaping a pile knitted fabric into a cylindrical shape in the circumferential direction of the shaft, depending on the direction of the shaft inserted into the seal material, since the shaft is inserted so as to push the pile, it is likely that the desired pile direction cannot be maintained. Then, since the sealing property becomes unstable, there has been a problem that powder leakage cannot be stably prevented.

[0007] Furthermore, in a shaft seal material using a pile knitted fabric, when oil or grease is applied to the pile surface, the intrusion of powder can be suppressed. However, since the powder tends to aggregate due to the viscous effect of the oil or grease, there has been a problem that the aggregates enter the powder container.

[0008] Thus, the characteristics required for a sealing member applied to a device handling powder, especially for a sealing member applied to a rotating device handling powder of a resin with a low glass transition temperature such as an electrophotographic image processing device, are a sealing member and a sealing method having high sealing performance, low friction with the rotating shaft, low heat generation, having a long life, and being low cost, etc.

[0009] Therefore, the inventors of the present invention have previously proposed a sealing material for use in devices that handle toner. For example, a sealing material for a rotating body such as a developing roller that handles toner in an electrophotographic image processing apparatus is made of a pile fabric in which pile yarns are raised from the surface of a base fabric, and the cut pile is obliquely fluffed so as to follow the rotation direction of the shaft (see Patent Document 1).

[0010] Furthermore, a shaft sealing material in which a pile fabric is formed in a cylindrical shape has been proposed as a shaft seal for a rotating body that handles toner in an electrophotographic image processing apparatus (see Patent Document 2).

[0011] In addition, as a seal member composed of sponge and felt, felt is disposed on the surface of a foamed base material such as sponge, and the surface of the felt is brought into contact with the outer peripheral surface of a developing roller or a photosensitive drum to perform sealing, or a yarn made of hollow fiber or porous hollow fiber is used as a pile yarn to form a rotating body seal member (for example, see Patent Document 3).

[0012] In addition to the present inventors, there have been proposals for bearing devices with a sealing function. There is a bearing with a sealing function in which holes are formed in a resin sheet and integrated with a bearing portion. A shaft is inserted into the holes formed in the sheet, the sheet is formed into a lip shape, and the sheet is brought into contact with the shaft to perform powder sealing, and the shaft is received by the bearing portion so that the shaft can rotate. (For example, see Patent Document 4.)

[0013] However, when forming the resin sheet into a lip shape for sealing, the principle of sealing by contacting the surface is that the hole diameter of the sheet must be made smaller than the shaft diameter in order to form it into a lip shape. A material in which the sheet can stretch and the accuracy of the hole diameter is required. Furthermore, if the hole diameter is made too small in terms of the shaft diameter and the sheet hole diameter, there will be a problem that the shaft cannot be inserted, and if the hole diameter is made such that the shaft can be inserted due to the stretching of the sheet, the hole portion (edge portion) of the sheet is configured to contact the shaft. Due to this influence, there is no problem with a metal shaft, but in the case of a resin shaft, there is a problem of friction between the resins, and the resin shaft formed from the resin is scraped by the edge portion which is the inner surface of this sheet hole.

Prior Art Documents

Patent Documents

[0014]

Patent Document 1

Patent Document 2

Patent Document 3

Patent Document 4

Summary of the Invention

Problems to be Solved by the Invention

[0015] When a seal member is used for a rotating shaft, when the seal member is attached, the tip of the pile is likely to be disturbed by the rotating shaft or the like, and if the orientation of the tip of the pile is disturbed, the powder regulating effect may be reduced. Further, when frictional heat is generated by high-speed rotation, the softened resin powder may adhere to the rotating shaft or the device may be locked. In addition, the torque applied to the rotating shaft increases, and the life of the seal member and the rotating device is shortened.

[0016] The problem to be solved by the present invention is to provide a shaft seal unit for a shaft portion of a rotating body, which can appropriately regulate the movement of powder, that is, to suppress the intrusion of powder from the location of the rotating shaft into the device interior, to suppress the leakage from the location of the rotating shaft to the outside, and to achieve high sealing performance such as this. In particular, it is to provide a shaft seal unit suitable for preventing powder leakage suitable for shaft sealing in a rotating body such as a toner supply roller of a rotating device in an apparatus using powder or an electrophotographic image processing apparatus handling toner which is a resin powder.

[0017] In addition to excellent sealing performance, it is a shaft seal unit structure that is suitable for handling toner, which is a resin powder, has low frictional force, is difficult to generate heat, has a long service life, and can be easily laid at low cost. The tip does not get disturbed and exhibits excellent sealing performance. That is, to provide a shaft seal unit that has excellent sealing performance, is difficult to generate heat with low frictional force, has a long service life, and has a simple structure that is easy to install.

[0018] Furthermore, it is to provide a shaft seal unit that enables the selection of the coefficient of friction, reduces the rotational torque in the seal part, can prevent powder leakage even at high-speed rotation, and can suppress the temperature rise.

Means for Solving the Problems

[0019] The first means for solving the problem is a shaft seal unit for the shaft part of a rotating body, which includes an outer peripheral part having a cylindrical cavity with a circular cross-section and a cylindrical rotating shaft driven member arranged in the cylindrical cavity. The outer peripheral part has a seal member on the inner peripheral surface of the cylindrical cavity, the inner peripheral surface of the seal member is in contact with the outer peripheral surface of the cylindrical rotating shaft driven member, the cylindrical rotating shaft driven member has a rotating shaft insertion hole at its center, and it is a shaft seal unit for the shaft part of the rotating body for restricting the movement of powder between the cylindrical rotating shaft driven member that follows the rotation of the rotating shaft and the outer peripheral part.

[0020] The second means is the shaft seal unit for the shaft part of the rotating body according to the first means, characterized in that the seal member is made of a fabric arranged to substantially circle the inner peripheral surface of the cylindrical cavity of the outer peripheral part.

[0021] The third means is the shaft seal unit for the shaft part of the rotating body according to the second means, characterized in that the fabric of the seal member is made of a woven or knitted fabric.

[0022] The fourth means is the shaft seal unit for the shaft part of the rotating body according to the third means, characterized in that the fabric of the seal member is made of a pile fabric.

[0023] The fifth means is the rotary shaft seal unit for a rotating body shaft portion according to the fourth means, wherein the tip of the pile of the pile fabric of the seal member is tilted toward the side where the powder enters (the side to be restricted) and is in contact with the cylindrical rotary shaft driven member.

[0024] The sixth means is the rotary shaft seal unit for a rotating body shaft portion according to the fourth means, wherein the tip of the pile of the pile fabric of the seal member is inclined toward the side where the powder enters (the side to be restricted).

[0025] The seventh means is the rotary shaft seal unit for a rotating body shaft portion according to any one of the fourth to sixth means, wherein the tip of the pile of the pile fabric of the seal member is inclined in the axial direction of the cylindrical rotary shaft driven member.

[0026] The eighth means is the rotary shaft seal unit for a rotating body shaft portion according to any one of the fourth to sixth means, wherein the tip of the pile of the pile fabric of the seal member is inclined obliquely with respect to both the axial direction and the rotational direction of the cylindrical rotary shaft driven member.

[0027] The ninth means is the rotary shaft seal unit for a rotating body shaft portion according to any one of the first to eighth means, wherein the cylindrical rotary shaft driven member is made of a plastic resin.

[0028] The tenth means is the rotary shaft seal unit for a rotating body shaft portion according to any one of the first to ninth means, wherein the cylindrical rotary shaft driven member is inserted into the cylindrical cavity of the outer peripheral part.

[0029] The eleventh means is such that when the rotational load torque between the seal member and the cylindrical rotary shaft driven member in contact therewith is N1, and the rotational load torque between the rotary shaft inserted through the rotary shaft insertion hole and the cylindrical rotary shaft driven member driven by the rotary shaft is N2, the rotary shaft seal unit for a rotating body shaft portion according to any one of the first to tenth means is characterized in that these relationships satisfy N2 > N1.

[0030] The 12th means is a shaft seal unit for a rotating body shaft portion according to any one of the 1st to 11th means, characterized in that the outer peripheral part is made of a thin plate having a cylindrical shape with a straight cylindrical outer shape and has a slit in the generatrix direction on the side surface of the cylinder.

[0031] The 13th means is a shaft seal unit for a rotating body shaft portion according to any one of the 1st to 12th means, characterized in that an outer jacket support member is provided around the outer peripheral part and supports the rotating shaft.

[0032] The 14th means is a shaft seal unit for a rotating body shaft portion with a bearing according to any one of the 1st to 12th means, characterized in that at least one end of the outer peripheral part further includes a bearing portion of the rotating shaft.

[0033] The 15th means is a shaft seal unit for a rotating body shaft portion with a bearing according to the 14th means, characterized in that at least one end of the outer peripheral part is integral with the outer race of the bearing portion of the rotating shaft.

Advantages of the Invention

[0034] By using the means of the present invention, the disturbance of the pile during shaft insertion can be easily suppressed, the leakage of powder can be stably prevented, and the service life can be extended. In addition, since the sealing performance is high and the torque is suppressed to suppress heat generation due to friction, it is possible to cope with high-speed rotation and seal while suppressing heat generation even when using a resin rotating shaft member, so that the cost can be reduced. Further, when using piles with oblique hairs that are oblique in the rotational direction with respect to the axial direction, the powder is promoted to flow to the pile tip according to the sweeping effect due to the regulation angle of the pile during the rotational operation, so that the sealing performance is improved. Therefore, it is also possible to omit the application of oil.

Brief Description of the Drawings

[0035]

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MODE FOR CARRYING OUT THE INVENTION

[0036] The embodiment of the present invention will be described below with appropriate reference to the drawings and tables.

[0037] The fabric used for the seal member of the present invention refers to a woven fabric, a knitted fabric (hereinafter, when the woven fabric and the knitted fabric are collectively referred to, they are also referred to as a woven / knitted fabric), a non-woven fabric, and a felt-like material. Hereinafter, the woven fabric will be described as a representative example. Further, the seal member is substantially cylindrical, and by providing an aluminum plate as a base on the outer periphery of the back surface of the fabric, it is possible to easily maintain the shape and improve the handleability.

[0038] The pile fabric used for the seal member of the present invention refers to a pile fabric or a pile knitted fabric. Further, either a looped pile or a cut pile whose tip is cut at the tip of the loop can be used. Hereinafter, the cut pile will be described as a representative example. Note that as the pile fabric for sealing fine resin powder having a diameter of about 10 μm, a cut pile is more preferable. This is because the seal member of the pile fabric can uniformly apply a load and come into contact therewith by a restoring force when a certain load is applied. Further, it is more preferable that the pile is obliquely oriented toward the side where the powder enters and the side where the powder leaks out.

[0039] The cylindrical rotating shaft driven member referred to in the present invention can be applied to any of those made of plastic resin, metal, and slidable rubber member. In particular, a plastic resin product that is excellent in production cost and lightweight is suitable. Therefore, in the following configuration examples, an example using a plastic resin will be described.

[0040] The regulation of the powder in the present invention means suppressing the intrusion and leakage of the powder from the rotating shaft portion so that the powder does not enter the apparatus from the rotating shaft portion or the powder does not leak to the outside from the rotating shaft portion.

[0041] The tip of the pile of the seal member being tilted toward the side where the powder enters (the side to be regulated) means that the pile in contact with the cylindrical rotating shaft driven member is tilted toward the side where the powder is located so that the tip of the pile regulates the inflow and leakage of the powder. That is, the tip of the pile is tilted toward the direction in which the powder enters and is brought into contact with the cylindrical rotating shaft driven member, or the tip of the pile is tilted toward the direction in which the powder tends to leak and is brought into contact with the cylindrical rotating shaft driven member. Specifically, the tip of the pile is tilted in one direction in the axial direction of the rotating shaft. Alternatively, as shown in FIG. 14, it may be tilted in a direction between the axial direction and the rotational direction of the rotating shaft so as to be obliquely oriented so as not to oppose the rotation.

[0042] When inserting a cylindrical rotation shaft driven member into the cylindrical cavity of the outer peripheral part, the tip of the pile of the seal member provided on the inner peripheral surface of the cylindrical cavity of the outer peripheral part is knocked down by the inserted cylindrical rotation shaft driven member. Therefore, it is possible to form a state in which the tip of the pile is tilted with the tip facing in the axial direction, which is the insertion direction. When the cylindrical rotation shaft driven member is inserted along the grain with the tip tilted in advance in the direction between the axial direction and the rotation direction of the rotation shaft, the obliquely arranged pile is not particularly turned upside down and does not oppose rotation. As a result, the powder that has entered due to the rotational movement of the cylindrical rotation shaft driven member is naturally washed away to the tip of the pile, promoting discharge.

[0043] Also, when the tip of the pile of the seal member is obliquely haired on the side where the powder enters (the side to be restricted), it means that the tip of the pile does not stand upright upward from the base, but is oriented in advance in the direction in which the tip of the pile tries to restrict the powder, and is arranged so as to fall obliquely toward the powder intrusion side or leakage side.

[0044] (Configuration Example 1) Fig. 1 shows a schematic diagram of the shaft seal unit for the rotating body shaft portion of Configuration Example 1. Fig. 1(a) is a view before inserting a cylindrical rotation shaft driven member (6) with a flange (20) into the cylindrical cavity (4) of the outer peripheral part (2) provided with a seal member (3). Fig. 1(b) is a schematic cross-sectional view showing the configuration of the shaft seal unit (1) for the rotating body shaft portion in a state where the cylindrical rotation shaft driven member (6) is inserted into the cylindrical cavity (4) in the insertion direction (14).

[0045] The fabric (17) of the seal member (3) in Configuration Example 1 is a knitted fabric of cut pile fabric and is attached over substantially the entire circumference of the inner peripheral surface (5) of the cylindrical cavity (4) provided in the outer peripheral part (2). In this configuration example, as shown in Fig. 1(a), the tip (12) of the cut pile (18) of the seal member (3) is pre-tilted to the left in the drawing and is in an obliquely haired state.

[0046] Inside this cylindrical cavity (4), a cylindrical rotation shaft driven member (6) is inserted from the insertion direction (14). The tip (12) of the pile of the cylindrical seal member (3) abuts against the outer peripheral surface (7) of the cylindrical rotation shaft driven member (6), thereby restricting the movement of the rotating powder (11) and sealing it. A flange (20) is provided at one end of the cylindrical rotation shaft driven member (6) so that it does not come off in one direction. The cylindrical rotation shaft driven member (6) has a rotation shaft insertion hole (9) at its axis.

[0047] Therefore, when the rotating body shaft portion shaft seal unit (1) is in use, it is inserted so as to be in close contact with the rotation shaft (10) fitted in the rotation shaft insertion hole (9). When the rotation shaft (10) rotates, the cylindrical rotation shaft driven member (6) also follows and rotates in the same direction. The seal member (3) fixed to the non-rotating outer peripheral parts has the tip (12) of its pile (18) in contact with the rotating cylindrical rotation shaft driven member (6) to shield the gap, so the movement of the powder (10) is blocked. In particular, the movement of the powder from left to right in Fig. 1(b) is restricted (refer to the direction (13) in which the powder in Fig. 2(c) is restricted).

[0048] Fig. 2 shows an example of application to a container for storing resin powder such as toner. The shaft seal unit (1) of Configuration Example 1 of the present invention described in Fig. 1 is attached to the end of the container (21) containing powder as shown in Fig. 2(a), and the rotating shaft (10) with an impeller (22) is inserted into the rotation shaft insertion hole (9) at the axis of the cylindrical rotation shaft driven member (6) of the shaft seal unit (1) from inside the container as shown in Figs. 2(b) and (c). Then, following the rotation of the rotation shaft (10), the cylindrical rotation shaft driven member (6) slides and rotates while the pile (18) abuts against the outer peripheral surface (7) of the cylindrical rotation shaft driven member (6). Then, the fine toner resin powder (11) stirred by the impeller (22) is prevented from leaking by the pile (18) provided on the rotation shaft at the left end of the container, so the powder (11) does not leak out from near the rotation shaft to the outside. Note that the shape of the outer peripheral parts is not limited as long as it has a cylindrical cavity (4) inside, and it may be integral with the parts at the end of the container.

[0049] Note that since both the outer peripheral part (2) and the cylindrical rotary shaft driven member (6) of this shaft seal unit (1) can be manufactured from plastic resin, it is low-cost and can be used simply by press-fitting the rotary shaft (10) into the shaft center.

[0050] Now, the inner peripheral surface of the cylindrical rotary shaft driven member (6) is configured to have a region in close contact with the rotary shaft (10) by being press-fitted into the rotary shaft insertion hole (9) as shown in FIG. 3(c). Therefore, the cylindrical rotary shaft driven member (6) rotates following the rotation of the rotary shaft (10). When the rotational torque due to the close contact between the rotary shaft (10) and the inner surface of the cylindrical rotary shaft driven member (6) is defined as rotational torque N2, the relationship with the rotational load torque N1 due to the contact between the seal member (3) shown in FIG. 3(b) and the surface of the cylindrical rotary shaft driven member (6) is configured such that N2 > N1. Then, since the rotary shaft (10) and the cylindrical rotary shaft driven member (6) rotate in the same rotational direction at substantially the same rotational speed, the shaft is not damaged and powder leakage in the axial direction through the rotary shaft (10) can be prevented.

[0051] Of course, the gap between the outer peripheral part (2) and the cylindrical rotary shaft driven member (6) is tightly sealed by the seal member (3), so there is no leakage from this gap either. However, due to the high sealing performance, if it succumbs to that force, the cylindrical rotary shaft driven member (6) may slip on the rotary shaft (10), and if it seems to slip, it may cause problems such as damage to the shaft and easy invasion and leakage of powder there. Therefore, considering the relationship between the torques N2 and N1 between the cylindrical rotary shaft driven members (6) press-fitted into the rotary shaft (10), by configuring it such that N2 > N1, the cylindrical rotary shaft driven member (6) does not slip on the rotary shaft (10) and will rotate integrally and passively, so powder leakage from near the rotary shaft can also be avoided.

[0052] In order to satisfy the condition that the rotational load torque N1 is less than or equal to N2, the cylindrical rotary shaft driven member (6) is preferably a plastic resin molded member such as nylon, POM, or PFA, or a cylindrical metal member. From the perspective of cost and the handling property of press-fitting onto the rotary shaft, the cylindrical rotary shaft driven member (6) made of resin molding is more preferable.

[0053] (Configuration Example 2) As another configuration example, next, FIG. 4 shows a shaft seal unit (1) having a structure in which the shaft seal unit (1) is integrally formed with a housing portion having a bearing portion (15). In this configuration, since the rotary shaft (10) is supported by a resin-made bearing portion (15) integrated with the outer peripheral part (2), the cost can be suppressed. Thus, the function as a bearing can also be added to the shaft seal unit (1) of the present invention. The bearing portion (15) here may be any that supports the rotation of the rotary shaft (10), and a structurally simple one, for example, one that does not include a bearing and simply utilizes the sliding of a plastic resin that supports the rotary shaft (10) from the periphery with a cylindrical inner peripheral wall, can also be applied.

[0054] (Configuration Example 3) FIG. 5 shows another aspect provided with the bearing portion (15) of Configuration Example 2 in FIG. 4. In this configuration, a bearing (23) with good slidability is used for the bearing portion (15) when the rotational speed of the rotary shaft is high, and the generation of frictional heat due to friction with the bearing portion (15) is suppressed. It is a shaft seal unit (1) having a structure in which the housing portion of the outer race (16) of the bearing (23) and the outer peripheral part are integrally formed. By using the bearing (23) for the bearing portion (15), it is possible to cope with the high-speed rotation of the rotary shaft. By configuring it integrally in this way, a shaft seal unit (1) that also serves as a bearing portion (15) can be obtained, and it is a convenient shaft seal unit (1) that can also cope with high-speed rotation.

[0055] (Configuration Example 4) By making the sealing member (3) adhere to the outer peripheral surface (7) of the cylindrical rotary shaft driven member (6), it is possible to prevent the intrusion of powder, not damage the rotary shaft, and in addition to the cylindrical rotary shaft driven member (6) rotating in the same rotation direction as the inserted rotary shaft (10) at substantially the same rotational speed, in order to suppress the frictional heat with the cylindrical rotary shaft driven member (6), it is preferable that the frictional resistance of the material itself used for the sealing member (3) is low. And in order to prevent the intrusion and leakage of powder, it is desirable that the sealing member (3) continues to be in uniform contact on the outer peripheral surface (7) of the cylindrical rotary shaft driven member (6) in a state where powder is difficult to intrude. For this purpose, it is preferable that the tip of the pile is obliquely fallen toward the side where powder intrudes and leaks, and it is pre-set to be obliquely hairy, or habituated to be obliquely hairy, or tilted when the cylindrical rotary shaft driven member (6) is inserted.

[0056] Therefore, in Configuration Example 4 shown in FIG. 6, in FIG. 6(a), the pile woven sealing member (3) standing upright is tilted by the cylindrical rotary shaft driven member (6) inserted into the cylindrical cavity (4) from the insertion direction (14) so as to push down the tip portion (12) of the pile. In FIG. 6(b), the tip portion (12) is obliquely inclined to the upper left. In this way, simply by inserting the cylindrical rotary shaft driven member (6) into the cylindrical cavity (4), the tip portion (12) of the pile (18) is stably tilted in the desired direction.

[0057] When the cylindrical rotary shaft driven member (6) is inserted into the inner circumference of the sealing member (3), the fibers are obliquely hairy so as to be pushed down in the insertion direction, so the tips do not face in various directions as in the case of conventional piles. Therefore, there are no uneven hairy portions, and the movement of powder can be stably regulated. That is, the pile is tilted so as to overlap, and continues to be in uniform contact with the cylindrical rotary shaft driven member (6) in a state where powder does not intrude, and the intrusion of powder can be prevented. And since the inner peripheral surface (8) of the sealing member is in contact with the cylindrical rotary shaft driven member (6), the cylindrical rotary shaft driven member (6) slides and rotates with the pile (18).

[0058] The seal member (3) using a substantially cylindrical pile weave shown in Fig. 6 can be obtained as follows. First, place and bond the base (19) of the pile woven fabric with a planar shape on an aluminum thin plate serving as a base. After cutting it into a desired strip shape with the cut pile portion (18) of the opened straight hair fibers standing upright upward, bend and form this strip-shaped section into a cylindrical shape with the pile tips facing inward and the aluminum plate facing outward to obtain a seal member (3) with a substantially cylindrical shape. When using such a base of an aluminum thin plate, it becomes easy to maintain the cylindrical shape.

[0059] Fig. 7 shows a configuration diagram of a substantially cylindrical shaft seal member (3) composed of a seal member (3) made of a pile woven fabric and a base (24) of a metal thin plate member such as aluminum, which is an outer peripheral part (2) for holding this seal member (3) in a cylindrical shape. The seal member (3) composed of a pile configuration is formed into a substantially cylindrical shape by cutting into a strip shape a bonded product of the seal member (3) and a metal thin plate such as aluminum with an adhesive layer and performing bending processing with the seal member on the inside.

[0060] When forming into a cylindrical shape, the aluminum thin plate of the bent outer peripheral part (2) can be provided with a slit (26) in the generatrix direction on the side surface of the cylinder. Then, the gap due to the slit of the aluminum thin plate ring can be narrowed like a spring. And if the outer diameter of the aluminum thin plate ring of the outer peripheral part (2) is made the same as, or slightly larger than, the inner diameter of the mounting hole provided in the bearing member (15), outer race (16), container (21), or jacket support member (25), the outer peripheral part (2) can be press-fitted and mounted by narrowing the gap of the slit (26) in the mounting hole.

[0061] After the contracted slit (26) is inserted into the mounting hole, it has a reaction force like a spring and is fixed in such a way that the outer peripheral part (2) is firmly press-fitted into the bearing member (15) or the outer sleeve support member (25). Therefore, when the rotary shaft (10) is inserted into the cylindrical rotary shaft driven member (6) and rotated, the seal member (3) and the outer peripheral part (2) do not rotate around the rotary shaft (10) following it, and the seal member (3) does not rotate. Only the cylindrical rotary shaft driven member (6) rotates in the same direction following the rotary shaft (10).

[0062] Fig. 8 shows a partially enlarged view of a cut pile structure composed of opened straight hair fibers. This pile fabric will be bonded onto the outer peripheral part (2) made of an aluminum thin plate as a base (24). As shown in Fig. 8, the cut pile fibers are opened upward from the base (19) bonded to the base (24), and the opening angles of the piles are densely configured so as to overlap each other. Therefore, no gap is generated, and it is suitable for appropriately excluding the intrusion of powders and the like.

[0063] Fig. 9 is a view showing a state in which the tip (12) of the pile contacts the cylindrical rotary shaft driven member (6) while tilting when the cylindrical rotary shaft driven member (6) is inserted into the cavity inside the seal member (3) of the pile fabric composed of opened straight hair fibers. When the cylindrical rotary shaft driven member (6) is inserted from the right direction to the left direction in the drawing, the cut piles (18) opened so as to overlap each other are pushed down by the cylindrical rotary shaft driven member (6), and the piles are densely folded over each other and contact the outer peripheral surface of the cylindrical rotary shaft driven member (6) while tilting to the left direction in the drawing. Therefore, the seal member (3) continuously contacts uniformly without the intrusion of powders. Therefore, by simply inserting the cylindrical rotary shaft driven member (6) into the cavity in the seal member (3), a tight contact without a gap between the pile tip (12) of the seal member (3) and the outer peripheral surface (7) of the cylindrical rotary shaft driven member (6) can be easily formed. Since the pile tips are not disturbed or scattered, it is possible to easily and stably prevent the intrusion of powders.

[0064] (Configuration Example 5) In the shaft seal unit (1) of Configuration Example 5 in FIG. 10, before the cylindrical rotary shaft driven member (6) is inserted, a seal member (3) made of a pile knitted fabric in which the tip (12) of the pile (18) of the seal member (3) is obliquely fluffed in advance in the direction in which powder enters (the direction to be regulated) is used. The oblique fluff can be positioned so as to fall naturally by the knitting or weaving method of the pile. Also, it can be made into oblique fluff by processing to give a bias so that the pile falls obliquely.

[0065] Then, when the cylindrical rotary shaft driven member (6) is inserted into the internal cavity (4) of the seal member (3), it is inserted from the right to the left in the drawing of FIG. 10(a) along the grain, without going against the grain of the oblique fluff. Then, as shown in FIG. 10(b), the state where the pile (18) is obliquely fluffed is maintained. In addition, since the tip portion (12) of the pile (18) is compressed and pushed down more to the left in the drawing, the cylindrical rotary shaft driven member (6) rotates while continuously contacting the cylindrical rotary shaft driven member (6) uniformly in a state where powder does not enter. Therefore, a stable effect can be obtained for preventing the intrusion of powder.

[0066] FIG. 11 shows a configuration in which a seal member (3) having a pre-angled pile structure is bonded to an outer peripheral part (2) of a thin metal plate such as aluminum for maintaining a cylindrical shape. The seal member (3) having a pile structure is formed into a cylindrical shape by bending a strip-shaped section bonded to the outer peripheral part (2) of the thin metal plate such as aluminum and the seal member (3) with a double-sided tape, hot melt, or an adhesive for maintaining the cylindrical shape. When formed into a cylindrical shape, the outer peripheral part (2) is provided with a reducible slit (26), and the slit can be reduced like a spring to reduce the outer diameter. When attaching to the bearing member (15) in FIG. 4 or the outer jacket support member (25) in FIG. 17, the outer diameter size of the aluminum thin plate cylinder of the outer peripheral part (2) is set to be the same as or slightly larger than the mounting hole diameter. The slit (26) is reduced, and the aluminum thin plate ring diameter is reduced while inserting and press-fitting it into the mounting hole for attachment. With this configuration, since the outer peripheral part (2) is fixed by being press-fitted into the bearing member (15), the outer race (16), the container (21), or the outer jacket support member (25), when the rotating shaft (10) is inserted into the cylindrical rotating shaft driven member (6) and rotated, the seal member (3) bonded to the outer peripheral part (2) does not rotate with the rotating shaft, and the cylindrical rotating shaft driven member (6) slides on the surface of the pile tip part (12) of the seal member (3) with the same rotational movement as the rotating shaft.

[0067] FIG. 12 is an enlarged view of a pre-angled pile structure. (a) is a view of a part of the pile from above, (b) is a top-down view of the entire pile, and (c) is a view shown from the side direction. On the outer peripheral part (2) made of an aluminum thin plate in FIG. 12(c), a pile angling is provided so as to overlap in the same direction. Further, as shown in FIG. 12(a), if a pile opening angle is provided, as shown in FIG. 12(b), the piles will be inclined so as to closely overlap each other, resulting in a denser state and improved sealing performance.

[0068] FIG. 13 is a view showing the state of the pile when the cylindrical rotation shaft driven member (6) is inserted into the seal member (3) made of a pile fabric with obliquely standing piles. The tip portions (12) of the piles (18) that are fibrillated so as to overlap each other are further pushed down at the tips (12) by the insertion of the cylindrical rotation shaft driven member (6) from the right to the left in the drawing, so that the tips (12) of the piles (18) closely overlap each other, and the seal member (3) can continuously contact uniformly on the outer peripheral surface of the cylindrical rotation shaft driven member (6) in a state where powder hardly penetrates. Therefore, it is possible to prevent the intrusion of powder from the outer peripheral surface (7) of the seal member (3) and the cylindrical rotation shaft driven member (6). By previously tilting the piles before inserting the cylindrical rotation shaft driven member (6), the obliquely standing state of the piles is easily maintained when the cylindrical rotation shaft driven member (6) is inserted. Therefore, when the piles are compressed and pushed down in the powder storage direction by further insertion, the tips of the piles are not disturbed. Thus, the gaps between the piles become dense without being disturbed, and the piles can continuously contact uniformly with the cylindrical rotation shaft driven member (6) in a state where powder does not penetrate. Therefore, a stable effect can be obtained for preventing the intrusion of powder.

[0069] (Configuration Example 6) FIG. 14 shows the sweeping effect of the seal member (3) of a pile fabric obliquely fluffed in the rotational direction with respect to the axial direction (the same direction as the direction of (14) in FIG. 1). Before the insertion of the cylindrical rotary shaft follower member (6), the pile is fluffed obliquely in advance and punched at an angle (that is, not at a position where the pile tips face in the axial direction, but a rectangular pile fabric that is obliquely oriented), so that it can be made to have an angle in the direction of the oblique fluffing and be obliquely oriented with respect to the axial direction. Further, by angling it in a direction where the pile pattern does not oppose the rotational direction of the cylindrical rotary shaft follower member (6), that is, instead of making the tip (12) of the oblique fluff perpendicular to the rotational direction, the tip (12) is obliquely oriented with respect to the rotational direction so as not to oppose the rotational direction and fluffed in the direction of the regulated angle shown in FIG. 14. That is, it is obliquely fluffed in the rotational direction with respect to the axial direction, and the tip of the pile is tilted at an angle intermediate between the axial direction of the rotary shaft and the rotational direction. Then, when the powder enters from the tip (12) of the pile, the contact surface between the angled pile tip portion and the cylindrical rotary shaft follower member (6) slides, and the powder moves on the surface of the pile fluffed obliquely by the rotation of the cylindrical rotary shaft follower member (6), is pushed downstream along the flow of the pile fibers to the tip side, and is pushed out in the tip direction along the pile pattern that is slightly inclined in the rotational direction, so that a sweeping effect due to the rotational operation can be provided.

[0070] FIG. 15 shows the configuration of the seal member (3) made of a pile woven or knitted fabric with an obliquely oriented pile tip (12) having a sweeping effect and an outer peripheral part (2) made of a thin metal plate such as aluminum for maintaining a cylindrical shape. The seal member (3) made of a pile configuration is bonded to the outer peripheral part (2) of a metal member such as aluminum with an adhesive layer to maintain a cylindrical shape and is formed into a cylindrical shape. When formed into a cylindrical shape, the outer peripheral part (2) is provided with a slit (26) so that its diameter can be reduced. When attaching it to the bearing member (15) in Fig. 4 or the outer sleeve support member (25) in Fig. 17, since the outer diameter of the outer peripheral part (2) is the same as or slightly larger than the mounting hole, it is press-fitted and attached with the slit in the mounting hole reduced. With this configuration, after the seal member (3) is inserted into the bearing member (15) or the outer sleeve support member (25), it is press-fitted and fixed. Therefore, even when the cylindrical rotating shaft driven member (6) with the rotating shaft (10) inserted rotates, the seal member (3) does not rotate with the rotating shaft, and the cylindrical rotating shaft driven member (6) rotates in the same direction as the rotating shaft inside the seal member (3).

[0071] The pile fabric is punched into a rectangle with the pile inclined and angled (obliquely with respect to the axial direction). The seal member (3) made of straight pile fibers with a regulated angle of the pile is compressed when the cylindrical rotating shaft driven member (6) is inserted, and the piles overlap each other. The seal member (3) continuously contacts uniformly on the outer peripheral surface of the cylindrical rotating shaft driven member (6) without powder intrusion. The powder that intrudes during rotation due to the regulated angle of the pile is pushed along the inclined pile by the sliding of the contact surface between the angled pile tip portion and the cylindrical rotating shaft driven member (6), and can be pushed out in the direction of the tip of the inclined pile, achieving a high effect in preventing powder intrusion. Since it is inclined and angled in advance, the cylindrical rotating shaft driven member (6) can be inserted while maintaining the regulated angle of the pile, and it has a function of naturally promoting powder discharge while maintaining the regulated angle. It is a cylindrical shaft seal material of the shaft seal unit (1) configured to prevent powder intrusion from the surface of the cylindrical rotating shaft driven member (6).

[0072] When the portion in contact with the cylindrical rotating shaft driven member (6) is a pile, compared with the surface contact of the conventional rubber seal material, the pile becomes a line contact where the tip (12) abuts. Therefore, the frictional resistance due to rotation is kept low.

[0073] Examples of materials for the seal member (3) that can continuously and uniformly contact the cylindrical rotating shaft driven member (6) include fiber members having a pile structure, felts made of fiber members, foams, and the like. Fig. 16 shows an example of the shaft seal unit (1) when a foam is used for the seal member (3). When a foam is used for the seal member (3), it is preferably a closed-cell structure in which the foams are independent to prevent powder from passing through. A member that covers to form the outer peripheral part (2) can also be combined with the outer part of the bearing that is integral with the outer peripheral part around the seal member (3) in Fig. 16. When the cylindrical rotating shaft driven member (6) is inserted into the inner diameter part of the foam punched out in a cylindrical shape, if the friction coefficient between the cylindrical rotating shaft driven member (6) and the foam is high and frictional heat or rotation occurs, it is possible to apply grease for improving slidability and use it. The grease for improving slidability is desirably highly viscous such as silicone-based or fluorine-based in consideration of sliding with the cylindrical rotating shaft driven member (6) having a resin material structure and not flowing out to the outside due to long-term rotational movement.

[0074] (Configuration Example 8) Figure 17 shows a configuration example of a shaft seal unit when using a cylindrical rotating shaft driven member (6) without a flange. The seal member (3) is fixed to the inner surface of the outer jacket support member (25) with a double-sided tape, adhesive, or the like. This is a configuration example of a shaft seal unit in which a cylindrical rotating shaft driven member (6) without a flange is elastically deformed and inserted inside the seal member (3). In Figure 17, after inserting the cylindrical rotating shaft driven member (6) inside the seal member (3), when the rotating shaft (10) is inserted, claws (27) are provided at both ends of the outer jacket support member (25) so that the cylindrical rotating shaft driven member (6) does not come out of the shaft seal unit (1). The elastically deformable cylindrical rotating shaft driven member (6) is deformed during insertion and then inserted inside the seal member (3). After that, the claws (27) serve as a retaining means to prevent the cylindrical rotating shaft driven member (6) from falling out even after the rotating shaft (10) is inserted. By providing claws on the outer jacket support member in this way to prevent the cylindrical shaft driven member (6) from coming out, a cylindrical shaft driven member (6) can be manufactured by cutting a pipe-shaped member to a desired width using a cylindrical forming member or a pipe-shaped member. By cutting the pipe-shaped member, a shaft seal unit can be provided at a lower cost.

[0075] (Configuration Example 9) The configuration example of Figure 18 is an example of a shaft seal unit configuration in which, after inserting a cylindrical rotating shaft driven member (6) without a flange into the seal member (3), the outer jacket support member (25) sandwiches the outer peripheral part (2), the seal member (3), and the cylindrical rotating shaft driven member (6), and claws (27) provided on the two left and right outer jacket support members prevent the cylindrical rotating shaft driven member (6) from falling out even after the rotating shaft is inserted. That is, it is a shaft seal unit (1) composed of the outer peripheral part (2) and the seal member (3) inside the outer jacket support member (25) and the cylindrical rotating shaft driven member (6) without a flange that slides and rotates inside the seal member (3), surrounded so as to be sandwiched by the left and right outer jacket support members. By configuring it to be divided into left and right parts, it can also be a shaft seal unit having a bearing, and thereby the rotating shaft (10) can be supported.

[0076] (Configuration Example 10) In the configuration example of FIG. 19, after inserting a cylindrical rotary shaft driven member (6) without a flange into the shaft seal material, the outer peripheral part (2) and the seal member (3) and the cylindrical rotary shaft driven member (6) are sandwiched from above and below by an outer jacket support member (25), and a claw (27) provided on the outer jacket support member (25) prevents the cylindrical rotary shaft driven member (6) from falling out even after the rotary shaft is inserted. That is, it is surrounded so as to be sandwiched by the upper and lower outer jacket support members (25), and is composed of an outer peripheral part (2) and a seal member (3) inside the outer jacket support member (25), and a cylindrical rotary shaft driven member (6) without a flange that slides and rotates inside the seal member (3). The shaft seal unit (1) can be configured to be divided into upper and lower parts to form a shaft seal unit having a bearing, and thereby the rotary shaft (10) can be supported.

[0077] In the configuration examples of FIGS. 17, 18, and 19, a cylindrical rotary shaft driven member (6) without a flange is provided with a claw (27) or the like on the outer jacket support member (25) to prevent the cylindrical rotary shaft driven member (6) from coming off. In the configuration examples of FIGS. 18 and 19, the cylindrical rotary shaft driven member (6) is sandwiched from both sides so that it does not come out of the outer jacket support member (25) when the rotary shaft (10) is inserted. There is no need to provide a flange on the cylindrical rotary shaft driven member (6), and it is a configuration example of a bearing that can maintain the state in which the cylindrical rotary shaft driven member (6) is arranged inside the seal member (3) even after the rotary shaft (10) is inserted. In the above configuration examples, the cylindrical rotary shaft driven member (6) without a flange is held inside the seal member (3) with the rotary shaft (10) inserted, and it is an example of a shaft seal unit (1) configured to perform the same rotational movement when the rotary shaft (10) rotates.

[0078] In the configuration of the present invention, as shown in FIG. 3, let the rotational load torque due to the close contact between the seal member (3) and the surface of the cylindrical rotary shaft driven member (6) be N1, and the rotational load torque due to the close contact between the rotary shaft (10) and the inner surface of the cylindrical rotary shaft driven member (6) be N2. A configuration that satisfies the condition N2 > N1 is the configuration condition of the present invention. By making the inner diameter of the cylindrical rotary shaft driven member (6) less than the outer diameter of the rotary shaft and configuring to press-fit the rotary shaft (10) during insertion, the rotational load torque N2 due to close contact can be obtained, the gap between the rotary shaft (10) and the cylindrical rotary shaft driven member (6) can be eliminated, and the intrusion of powder through the rotary shaft (10) can be prevented. In order to obtain the rotational load torque due to the close contact of the rotary shaft (10), the inner diameter of the cylindrical rotary shaft driven member (6) is made less than the outer diameter of the rotary shaft and press-fitted, and the press-fitting conditions are appropriately selected under the condition that N2 > N1 is satisfied.

[0079] FIG. 20 shows a shape in which a protrusion (28) is provided in part inside the cylindrical rotary shaft driven member (6) so as to eliminate the gap with the rotary shaft, and thus the rotational load torque N2 can be sufficiently obtained when the rotary shaft is inserted. By providing a shape having a protrusion (28) inside the cylindrical rotary shaft driven member (6) and making the inner diameter formed by the protrusion (28) smaller than the rotary shaft diameter, the rotational load torque N2 can be obtained when the rotary shaft is inserted. Compared with the configuration in which the inner diameter of the cylindrical rotary shaft driven member (6) is made less than the outer diameter of the rotary shaft and the rotary shaft is press-fitted during insertion, the area to be press-fitted on the rotary shaft (10) is reduced, the load during rotary shaft insertion is reduced, and when the rotary shaft is detached, only the cylindrical rotary shaft driven member (6) can be easily removed without coming off. If the rotational load torque N2 due to the close contact of the inner surface of the cylindrical rotary shaft driven member (6) is equal to or greater than the rotational load torque N1 due to the close contact between the seal material and the surface of the cylindrical rotary shaft driven member (6), there is no limitation on the shape of the protrusion (28). When a flange (20) is provided on the cylindrical rotary shaft driven member (6), since the rigidity tends to be high at the location of the flange (20), the load during rotary shaft insertion is higher at this location than at other locations even with the same protrusion shape. Therefore, the location where the protrusion (28) is provided is preferably a location other than the flange as shown in FIG. 20.

[0080] Figure 21 shows a shape that can obtain the rotational load torque N2 when inserting the rotating shaft by making a part of the inside of the cylindrical rotating shaft driven member (6) into a tapered shape (29). Similar to the protrusion shape (28) in the previous section, by making a part of the inner diameter of the cylindrical rotating shaft driven member (6) less than the outer diameter of the rotating shaft, the rotational load torque N2 on the rotating shaft (10) can be obtained, and the load of inserting the rotating shaft can be reduced by reducing the press-fitting area. By making it into a tapered shape (29), the area in contact with the rotating shaft (10) increases compared to the protrusion shape (28), and by changing the angle and length of the taper (29), the rotational load torque N2 can be set to an optimal value with respect to the material and shape of the seal member (3) and the rotating shaft.

[0081] Figure 22 shows that by applying rotation stopping to the rotating shaft (10) by D-cut and making the inner side of the cylindrical rotating shaft driven member (6) into a similar fitting convex portion shape (31) facing each other, the rotational load torque N2 can be obtained when inserting the rotating shaft (10), and the cylindrical rotating shaft driven member (6) and the rotating shaft (10) can perform a rotational movement in substantially the same rotational direction. In the case of the configuration example in Figure 22, in order to prevent the intrusion of powder from the gap between the cylindrical rotating shaft driven member (6) and the rotating shaft (10), it is preferable to provide a region in close contact with the rotating shaft (10). In addition to the D-cut shape (30), the shape of the rotating shaft can be made to correspond to various shapes by changing the inner diameter shape of the cylindrical rotating shaft driven member (6).

[0082] Figure 23 shows another usage example of the shaft seal unit for the rotating body shaft portion. It shows a usage example in which the shaft seal unit (1) including the bearing (15) is attached to a housing having the attachment portion (32) under the condition that the shaft seal unit (1) does not fall off from the attachment portion (32). It shows a usage example in which it is used at the end of the rotating shaft (10) that stirs the powder (11) with the impeller (22) for the purpose of preventing the powder (11) from leaking from the inside.

[0083] FIG. 24(a) shows a shaft seal unit for a rotating body shaft portion which is a comparative example, and the pile tips at the tip (12) of the pile (18) face in the reverse direction. In this comparative example, since the pile is pushed into the insertion direction (14) when the rotating shaft (10) is inserted, the pile tips are disturbed and, when powder is filled, it enters the area that has been pushed in. And if powder enters the pushed-in location, there is a risk that this location will rub against the rotating shaft, generating frictional heat. Also, when the rotating shaft is inserted into the cylindrical shaft seal material having an inclined pile structure, the pile is pushed in the insertion direction and the inclined pile state and the regulated angle cannot be maintained, resulting in a decrease in the powder intrusion prevention performance.

[0084] In contrast, the shaft seal unit (1) of the present invention in FIG. 24(b) is configured such that the pile tip portion (12) is inclined in the powder (11) storage direction by the cylindrical rotating shaft driven member (6) before the insertion of the rotating shaft (10). Since the rotating shaft (10) does not come into contact with the seal member (3) at all, the regulated angle can be maintained during the insertion of the rotating shaft, and stable powder intrusion prevention performance can be achieved when performing a rotational movement in a state where the powder (11) is filled. Therefore, even if the shaft seal unit of the present invention is applied to the end of a container that contains a large amount of fine powder such as a toner cartridge, it can be stably used without powder leakage.

[0085] Under the conditions of the seal member of the materials and shapes described in Table 1 and Table 2, the cylindrical rotating shaft driven member, the material of the rotating shaft, the direction of the inclined pile, and the torques N1 and N2, it was confirmed whether the upper powder (11) leaks downward from the device sealed by the shaft seal unit (1) of the present invention due to the rotation of the rotating shaft (10) (see FIG. 25). The results are shown in Tables 1 and 2. A case of excellent sealing performance and resistance to temperature rise is indicated by ○, a fair case by △, and a poor evaluation by ×.

[0086]

Table 1

[0087]

Table 2

[0088] As shown in Table 1, in the combinations of the configurations of Examples 1 to 7, all had good sealing performance and were less likely to experience temperature rise, resulting in excellent results in both aspects.

[0089] As shown in Table 2, in Comparative Examples 2 to 4, the N1 torque exceeded N2, resulting in poor sealing performance. As a result, powder invaded and the temperature rose. In Comparative Example 1, since the tips of the pile were in the reverse direction, powder invasion was observed, so it is considered to be inferior in long-term sealing performance.

[0090] As described in the above Examples and Comparative Examples of Table 1 and Table 2, by setting the relationship between the rotational load torque N1 of the seal member and the cylindrical rotating shaft driven member and the rotational load torque N2 of the cylindrical rotating shaft driven member and the rotating shaft as N2 > N1, a sealing performance without powder leakage can be achieved, and the temperature rise due to the rotation of the shaft can be suppressed, resulting in a shaft seal unit that is unprecedented.

Explanation of Reference Signs

[0091] 1 Shaft seal unit 2 Outer peripheral parts 3 Seal member 4 Cylindrical cavity 5 Inner peripheral surface of the cylindrical cavity 6 Cylindrical rotating shaft driven member 7 Outer peripheral surface 8 Inner peripheral surface part 9 Rotating shaft insertion hole 10 Rotating shaft 11 Powder 12 Tip 13 Regulation direction 14 Insertion direction 15 Bearing part 16 Outer race 17 Fabric 18 Pile 19 Base 20 Flange 21 Container 22 Impeller 23 Bearing 24 abutment 25 jacket support member 26 slit 27 claw 28 protrusion 29 taper 30 rotation prevention by D-cut 31 fitting convex portion shape 32 mounting portion

Claims

1. An outer peripheral part having a cylindrical cavity with a circular cross-section, and A shaft seal unit for a rotating body shaft portion, comprising a cylindrical rotary shaft driven member disposed within the cylindrical cavity, The outer peripheral part is provided with a seal member on the inner peripheral surface of the cylindrical cavity thereof, The seal member is made of a fabric arranged so as to substantially encircle the inner peripheral surface of the cylindrical cavity of the outer peripheral part, and the fabric is a woven or knitted fabric made of a pile fabric, The inner peripheral surface portion of the seal member is in contact with the outer peripheral surface of the cylindrical rotary shaft driven member, The cylindrical rotary shaft driven member has a rotary shaft insertion hole at its center, For restricting the movement of powder between the cylindrical rotary shaft driven member that follows the rotation of the rotary shaft and the outer peripheral part, A shaft seal unit for a rotating body shaft portion.

2. The shaft seal unit for a rotating body shaft portion according to claim 1, characterized in that the tip portions of the piles of the pile fabric of the seal member are tilted toward the side (the side to be restricted) where powder intrudes and are in contact with the cylindrical rotary shaft driven member.

3. Characterized in that the tip portions of the piles of the pile fabric of the seal member are fluffed toward the side (the side to be restricted) where powder intrudes, The shaft seal unit for a rotating body shaft portion according to claim 1.

4. The shaft seal unit for a rotating body shaft portion according to any one of claims 1 to 3, characterized in that the tip portions of the piles of the pile fabric of the seal member are inclined in the axial direction of the cylindrical rotary shaft driven member.

5. The shaft seal unit for a rotating body shaft portion according to any one of claims 1 to 3, characterized in that the tip portions of the piles of the pile fabric of the seal member are inclined obliquely with respect to both the axial direction and the rotational direction of the cylindrical rotary shaft driven member.

6. The shaft seal unit for a rotating body shaft portion according to any one of claims 1 to 5, characterized in that a cylindrical rotation shaft driven member is inserted into a cylindrical cavity of an outer peripheral part.

7. Let the rotational load torque between the seal member and the cylindrical rotation shaft driven member in contact therewith be N1, When the rotational load torque between the rotating shaft inserted through the rotating shaft insertion hole and the cylindrical rotation shaft driven member driven by the rotating shaft is N2, The relationship between them is N2 > N1, The shaft seal unit for a rotating body shaft portion according to any one of claims 1 to 6, characterized by this.

8. The outer peripheral part is made of a thin plate having a cylindrical shape with a straight cylindrical outer shape, and has a slit in the generatrix direction on the side surface of the cylinder, The shaft seal unit for a rotating body shaft portion according to any one of claims 1 to 7, characterized by this.

9. The shaft seal unit for a rotating body shaft portion according to any one of claims 1 to 8, characterized in that an outer jacket support member is provided around the outer peripheral part and supports the rotating shaft.

10. The shaft seal unit for a rotating body shaft portion with a bearing according to any one of claims 1 to 8, characterized in that a bearing portion of the rotating shaft is further provided at at least one end of the outer peripheral part.

11. The shaft seal unit for a rotating body shaft portion with a bearing according to claim 10, characterized in that at least one end of the outer peripheral part is integral with the outer race of the bearing portion of the rotating shaft.

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