CN217125110U

CN217125110U - Marine propeller and thrust washer

Info

Publication number: CN217125110U
Application number: CN202123297896.9U
Authority: CN
Inventors: 王强; 陶师正; 万小康
Original assignee: Guangdong ePropulsion Technology Co Ltd
Current assignee: Guangdong ePropulsion Technology Co Ltd
Priority date: 2021-12-23
Filing date: 2021-12-23
Publication date: 2022-08-05
Anticipated expiration: 2031-12-23

Abstract

The application discloses marine propeller and thrust washer, marine propeller includes: the motor comprises a motor shell and a motor shaft, and the motor shaft extends out of the motor shell; the propeller is connected to the motor shaft; the thrust washer is sleeved on the motor shaft and positioned between the motor shell and the propeller; the side surface of the thrust washer is provided with a winding surface; a gap opening is formed between the propeller and the motor shell at the periphery, a gap shielding wall is arranged on the propeller, and the gap shielding wall is positioned between the gap opening and the winding surface; the gap shielding wall is used for shielding the gap opening. The marine propeller of this application is through setting up one on the screw and sheltering from the crack wall, and this hides the crack wall and can shelter from winding such as pasture and water, fish tape in the complicated waters, avoids it to be drawn into the gap between thrust washer and the screw and then is drawn into oil blanket department through the motor shaft and makes the oil blanket inefficacy. Therefore, the oil seal is effectively protected, the service life of the oil seal is greatly prolonged, and the maintenance cost of a product is reduced.

Description

Marine propeller and thrust washer

Technical Field

The application relates to the field of marine equipment, in particular to a marine propeller and a thrust washer.

Background

The existing marine propeller uses a propeller as a propulsion device for generating a propulsion power to advance a ship. When the underwater propulsion system of the marine propeller operates in a relatively complex water area environment, entanglement of aquatic plants, fish wires and other entanglement can be caused to influence the normal operation of the machine, even the machine is damaged, so that the machine cannot be used, and therefore, the marine propeller is needed to be designed to solve the problems.

SUMMERY OF THE UTILITY MODEL

The application provides a marine propeller and a thrust washer, which aim to solve the problem that when an underwater propulsion system of the marine propeller runs in a relatively complex water area environment, entanglement of aquatic plants, fish wires and the like can be wound to influence the normal running of a machine or even damage the machine, so that the machine cannot be used after being scrapped.

In order to solve the above technical problem, the present application provides a marine propeller, including: the motor comprises a motor shell and a motor shaft, and the motor shaft extends out of the motor shell; the propeller is connected to the motor shaft; the thrust washer is sleeved on the motor shaft and positioned between the motor shell and the propeller; the side surface of the thrust washer is provided with a winding surface; a gap opening is formed between the propeller and the motor shell at the periphery, a gap shielding wall is arranged on the propeller, and the gap shielding wall is positioned between the gap opening and the winding surface; the gap shielding wall is used for shielding the gap opening.

Preferably, the projection of the clearance opening falls completely on the blanking gap wall in a direction perpendicular to the central axis of the motor shaft.

Preferably, the thrust washer further comprises a first end face abutting against the propeller and a second end face abutting against the motor housing, and the side surface is connected between the first end face and the second end face; an inclined groove surface is connected between the winding surface and the first end surface.

Preferably, the chamfer surface is planar, and the circumference of the thrust washer at the chamfer surface decreases gradually along the direction from the first end surface to the second end surface.

Preferably, the winding surface is parallel to the central axis of the motor shaft, and the inclined groove surface is inclined to the central axis of the motor shaft.

Preferably, the thrust washer includes the wrapping post, connects in the global installation department of wrapping post and inclined plane board, and installation department and inclined plane board are located the both ends of wrapping post respectively, and the side surface of wrapping post is as the winding face, and the installation department is used for being connected with the motor casing, and the inclined plane board butt is in the screw, and the surface that the inclined plane board deviates from the screw is the chute face.

Preferably, the inclined plane plate includes a spacing groove provided along a circumferential direction of the winding post, and a projection of the mounting portion along a central axis direction of the motor shaft falls into the spacing groove.

Preferably, the motor casing further comprises an oil seal structure, and the oil seal structure is arranged between the motor shaft and the motor casing; the thrust washer cover is arranged on the oil seal structure.

Preferably, the motor casing is formed with an oil seal mounting groove and a gasket mounting groove, the oil seal structure is disposed in the oil seal mounting groove, and the thrust gasket is detachably mounted in the gasket mounting groove and covers the oil seal mounting groove.

Preferably, the thrust washer comprises a first end abutting the propeller and a second end abutting the motor housing, the winding surface being connected between the first end and the second end; the second end part is positioned in the gasket mounting groove, and the depth of the gasket mounting groove is greater than the height of the second end part; the propeller and the top end of the gasket mounting groove form a clearance opening.

In order to solve the technical problem, the application also provides a thrust washer, and the thrust washer is used between the motor and the propeller; the thrust washer includes a first end face and a second end face, and a side surface connecting the first end face and the second end face; the side surface is formed with a winding surface, and a chute surface is connected between the winding surface and the first end surface.

Preferably, the first end face is used for abutting against the propeller, and the second end face is used for abutting against the motor.

The beneficial effect of this application is: being different from the condition of prior art, this application discloses a marine propeller and thrust washer, marine propeller includes: the motor comprises a motor shell and a motor shaft, and the motor shaft extends out of the motor shell; the propeller is connected to the motor shaft; the thrust washer is sleeved on the motor shaft and positioned between the motor shell and the propeller; the side surface of the thrust washer is provided with a winding surface; a gap opening is formed between the propeller and the motor shell at the periphery, a gap shielding wall is arranged on the propeller, and the gap shielding wall is positioned between the gap opening and the winding surface; the gap shielding wall is used for shielding the gap opening. This application marine propeller's screw and motor casing are formed with the clearance mouth in the periphery, through set up on the screw and hide the crack wall for hide the crack wall and can avoid windings such as pasture and water, fish tape to be drawn into the gap between thrust washer and the screw and then be drawn into oil blanket department through the motor shaft and make the oil blanket inefficacy. Therefore, the oil seal is effectively protected, the service life of the oil seal is greatly prolonged, and the maintenance cost of the marine propeller is reduced.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without inventive efforts, wherein:

FIG. 1 is a schematic view of a marine propulsor of the present application;

FIG. 2 is a schematic cross-sectional view of the marine propulsor of FIG. 1 in the direction A-A;

FIG. 3 is an enlarged view of a portion of the marine propulsor of FIG. 2;

FIG. 4 is a schematic structural view of an embodiment of a thrust washer of the marine propulsor of the present application;

FIG. 5 is a front view of an embodiment of the thrust washer of FIG. 4;

FIG. 6 is a schematic cross-sectional view taken along the direction B-B of an embodiment of the thrust washer shown in FIG. 5;

FIG. 7 is a schematic cross-sectional view of yet another embodiment of the thrust washer of FIG. 5 taken along the direction B-B;

FIG. 8 is a schematic view of a thrust washer of the marine propeller of the present application;

FIG. 9 is a front view of an embodiment of the thrust washer of FIG. 8;

FIG. 10 is a schematic cross-sectional view of an embodiment of the thrust washer of FIG. 9 taken along the direction C-C.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

It should be noted that, if directional indications (such as upper, lower, left, right, front and rear … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are changed accordingly.

In addition, if there is a description relating to "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.

The present invention provides a marine propeller and a thrust washer, which will be described in detail with reference to the following embodiments.

Referring to fig. 1, 2 and 3, fig. 1 is a schematic view of a marine propeller according to the present invention; FIG. 2 is a schematic cross-sectional view of the marine propulsor of FIG. 1 in the direction A-A; fig. 3 is a partially enlarged view of the marine propeller of fig. 2. The application discloses marine propeller, this marine propeller includes: the motor comprises a motor shell 11 and a motor shaft 12, wherein the motor shaft 12 extends out of the motor shell 11; the propeller 2 is connected to the motor shaft 12; the thrust washer 3 is sleeved on the motor shaft 12 and is positioned between the motor shell 11 and the propeller 2; the side surface of the thrust washer 3 is formed with a winding surface 320; a gap opening 21 is formed at the periphery of the propeller 2 and the motor shell 11, a gap shielding wall 22 is arranged on the propeller 2, and the gap shielding wall 22 is positioned between the gap opening 21 and the winding surface 320; the gap shielding wall 22 is used for shielding the gap opening 21. This application marine propeller's screw 2 and motor casing 11 are formed with gapped mouth 21 in the periphery, through set up on screw 2 and hide gapped wall 22 for hide gapped wall 22 can avoid windings such as pasture and water, fish tape directly to be drawn into the gap between thrust washer 3 and screw 2 and then be drawn into oil blanket department through motor shaft 12 and make the oil blanket inefficacy. Therefore, the oil seal is effectively protected, the service life of the oil seal is greatly prolonged, and the maintenance cost of the marine propeller is reduced.

In particular, when the underwater propulsion system of the marine propeller operates in a relatively complicated water environment, the entanglement of aquatic plants, fish lines and other entanglement objects can affect the normal operation of the machine and even damage the machine, so that the machine is scrapped and cannot be used. The windings will be directed through the clearance gap 21 into the gap between the thrust washer 3 and the propeller 2 and be drawn into the oil seal causing the oil seal to fail. The present application therefore provides that by providing the baffle wall 22 on the side of the propeller 2 facing the oil seal, the baffle wall 22 is arranged to block those windings which enter the oil seal through the clearance gap 21 from entering the gap between the thrust washer 3 and the propeller 2. So, can effectively protect oil blanket structure, improve oil blanket life.

In some embodiments, with reference to fig. 2 and 3, the projection of the clearance opening 21 in a direction perpendicular to the central axis of the motor shaft 12 falls entirely on the blanking wall 22. In this way, most of the winding entering the marine propeller through the gap opening 21 contacts the gap shielding wall 22, so that the impact force of the winding can be buffered; on the other hand, it is possible to avoid the entanglement from directly entering the gap between the propeller 2 and the thrust washer 3 from the clearance port 21 to be caught in the oil seal so that the oil seal fails. It should be noted that the central axis may refer to a central line of an axisymmetric figure, a building, or other objects, and in this application, the dashed line L in fig. 2 may be simply regarded as the central axis of the marine propeller.

Referring to fig. 3, the length of the shielding gap wall 22 is generally equal to or greater than the projection length of the gap opening 21 in the direction perpendicular to the central axis of the motor shaft 12. Specifically, the length of the shielding gap wall 22 may be set to 1.2 times the projection length of the gap opening 21 in the vertical direction of the central axis of the motor shaft 12, and the extra length may be used to prevent errors.

With reference to fig. 6, the thrust washer 3 further comprises a first end face 32 abutting against the propeller 2 and a second end face 33 abutting against the motor casing 11, the side faces being connected between the first end face 32 and the second end face 33; a chamfered surface 310 is connected between the winding surface 320 and the first end surface 32. Thus, the thrust washer 3 forms a storage groove with the winding surface 320 and the chamfer surface 310 of the thrust washer 3. When the machine normally operates, the winding can contact the gap shielding wall 22 on the propeller hub of the propeller 2 through the gap opening 21 and fall into the wire storage groove, and when the winding of the wire storage groove is increased to a certain degree, regular maintenance can be carried out to take away the winding to avoid the failure of the oil seal; if the winding object directly twines propeller 2 and makes propeller 2 stall, then the user directly clear up the winding object can, also can protect the oil blanket effectively. The thrust washer 3 serves as an outer ring structure of the oil seal structure, and can well protect the oil seal structure. Further, the design of the wire storage groove formed by the thrust washer 3, the winding surface 320 and the chute surface 310 improves the environmental adaptability of the marine propeller, and effectively protects the normal operation of the marine propeller in a complex water area environment. The design of the chute surface 310 can also play a role in guiding, so that the winding can slide into the storage slot along the chute surface 310, and the winding is prevented from being drawn into the oil seal to damage the oil seal structure. In addition, the design of the wire storage groove can be set differently according to actual needs, and the embodiment does not limit the application in any way.

In some embodiments, referring to fig. 4-6, the chute surface 310 is a flat surface that can guide the winding to slide along the chute surface 310 into the storage slot. The circumference of the thrust washer 3 at the ramp surface 310 decreases in the direction from the first end surface 32 to the second end surface 33. Therefore, the winding can be guided to fall into the wire storage groove, and the oil seal structure is protected. Specifically, the design that the inclined groove surface 310 is a plane facilitates the manufacturing of the thrust washer 3, and the winding object can fall on the bottom surface of the wire storage groove as much as possible; the design of the thrust washer 3 with a decreasing circumference at the chute face 310 can also play a role in guiding the chute face 310 such that the windings are drawn into the storage slots. It will be appreciated that the thrust washer 3 may also be provided with mounting locations 360 for mounting the thrust washer 3 to a marine propeller.

Referring to fig. 6, separately, the bevel face 310 is in a truncated cone shape as a whole, and in order to ensure that the change from the bevel face 310 to the second end face 33 is large enough, it is required to ensure that the included angle between the bevel face 310 and the first end face 32 is small enough. In this embodiment, the included angle may be designed to be 60 °.

Further, referring to fig. 6, the winding surface 320 is parallel to the central axis of the motor shaft 12, and the inclined groove surface 310 is inclined to the central axis of the motor shaft 12. Therefore, the winding can be guided to fall into the wire storage groove, and the oil seal structure is protected.

Further, referring to fig. 7, the inclined groove surface 310 is inclined with respect to the motor shaft 12, and the winding surface 320 is parallel with respect to the central axis of the motor shaft 12, it can be understood that the overall design of the wire storage groove may be different according to actual requirements, for example, an inclined surface may also be formed on the thrust washer 3 opposite to the inclined groove surface 310 to concentrate the winding object at the middle position of the wire storage groove.

Referring to fig. 8 to 10, the thrust washer 3 may include a winding post 31, and a mounting part 36 and a slope plate 311 attached to a circumferential surface of the winding post 31, the mounting part 36 and the slope plate 311 being respectively located at both ends of the winding post 31. The mounting part 36 is located at one end of the thrust washer 3, which is in contact with the motor casing 11, and is used for being connected with the motor casing 11; the bevel plate 311 is located at one end of the thrust washer 3 contacting the propeller 2 and abuts against the propeller 2. The surface of the bevel board 311 facing away from the propeller 2 is a bevel surface 310. Here, the side surface of the winding post 31 may be used as the winding surface 320, and the mounting portion 36 in this embodiment corresponds to the mounting portion 360 in the first embodiment described above, for mounting the thrust washer 3 to the marine propeller. The bevel plate 311 includes the above-described bevel groove surface 310.

The inclined plate 311 includes a spacing groove 312 provided along the circumferential direction of the winding post 31, and the projection of the mounting portion 36 along the central axis direction of the motor shaft 12 falls into the spacing groove 312. In this manner, the user is facilitated to install the mounting portion 36.

Specifically, the present embodiment uses the mounting portion 36 of the thrust washer 3 for connection with the motor case 11, and provides the bevel plate 311 for abutting against the propeller 2. Thus, the winding post 31 is formed, and the area of the winding surface 320 is increased, thereby increasing the protection area against winding. Further, in order to facilitate mounting the mounting portion 36, the inclined plate 311 is provided with a spacing groove 312, so as to form a space for avoiding the mounting portion 36, and the spacing groove 312 can also be used for collecting the winding object. In addition, a concave design can be added in the thrust washer 3, so that the wound can be accommodated conveniently, the storage effect is formed, and the anti-winding effect can be enhanced.

Specifically, in this embodiment, during normal operation of the marine propeller, the winding in water enters through the gap 21 formed between the propeller 2 and the motor housing 11 at the outer periphery, first contacts the gap wall 22 on the hub of the propeller 2, and then falls into the wire storage groove formed between the wire winding surface 320 and the propeller 2, when the winding in the wire storage groove becomes more, the winding winds around the thrust washer 3, the machine may report the rotation jam due to friction, and the user may go to maintenance after the rotation jam is reported. Therefore, the environmental adaptability of the product is greatly improved, and the normal operation of the product in a complex water area environment is effectively protected; the oil seal is effectively protected, the service life of the oil seal is greatly prolonged, and the maintenance cost of the product is reduced.

Further, the motor housing 11 further includes an oil seal structure, and the oil seal structure is disposed between the motor shaft 12 and the motor housing 11; the thrust washer 3 covers the oil seal structure. It can be understood that motor casing 11 still includes oil seal structure, and oil seal structure has been protected to thrust washer 3 lid, the technical scheme of this application.

Further, the motor housing 11 is formed with an oil seal mounting groove 111 and a gasket mounting groove 112, the oil seal structure is disposed in the oil seal mounting groove 111, and the thrust washer 3 is detachably mounted in the gasket mounting groove 112 and covers the oil seal mounting groove 111. It can be understood that the motor case 11 is formed with the oil seal mounting groove 111 and the washer mounting groove 112, and since the oil seal structure is provided in the oil seal mounting groove 111 and the thrust washer 3 is detachably mounted in the washer mounting groove 112, the shape and size of the oil seal mounting groove 111 and the washer mounting groove 112 can be set to be adapted to the oil seal structure and the thrust washer 3. The thrust washer 3 is designed to protect the oil seal structure, so the thrust washer 3 covers the oil seal installation groove 111.

Further, the thrust washer 3 includes a first end 34 abutting against the propeller 2 and a second end 35 abutting against the motor housing 11, and the winding surface 320 is connected between the first end 34 and the second end 35; the second end 35 is positioned in the gasket installation groove 112, and the depth of the gasket installation groove 112 is greater than the height of the second end 35; the propeller 2 forms a clearance gap 21 with the tip of the washer-mounting groove 112.

Be different from prior art, when considering that boats and ships navigation is in the waters environment of relative complicacy, probably have the entanglement to influence the operation of machine and destroy the machine even and make the machine scrap unable use, the application discloses a marine propeller and thrust washer 3, marine propeller includes: the motor comprises a motor shell 11 and a motor shaft 12, wherein the motor shaft 12 extends out of the motor shell 11; the propeller 2 is connected to the motor shaft 12; the thrust washer 3 is sleeved on the motor shaft 12 and is positioned between the motor shell 11 and the propeller 2; the side surface of the thrust washer 3 is formed with a winding surface 320; a gap opening 21 is formed at the periphery of the propeller 2 and the motor shell 11, a gap shielding wall 22 is arranged on the propeller 2, and the gap shielding wall 22 is positioned between the gap opening 21 and the winding surface 320; the gap shielding wall 22 is used for shielding the gap opening 21. Based on this, the winding will pass through the gap 21 formed on the outer periphery of the propeller 2 and the motor housing 11, contact the shielding gap wall 22 on the hub of the propeller 2 first, and then fall into the storage slot, and the shielding gap wall 22 is designed to avoid the winding from being directly caught in the gap between the thrust washer 3 and the propeller 2, so that the oil seal fails. When the winding in the wire storage groove is increased to a certain degree, regular maintenance is needed to avoid the winding from being involved in the oil seal to burn the oil seal, so that the sealing is invalid; if the winding object directly twines propeller 2 and makes propeller 2 stall and shut down, then follow-up direct clearance winding object can, also can protect the oil blanket effectively. In addition, on the specific design of the ship propeller, the design can be different according to the actual situation, and the embodiment does not limit the application in any way.

In order to solve the problems of the prior art, the embodiment also provides a thrust washer 3, wherein the thrust washer 3 is used between the motor and the propeller 2; the thrust washer 3 includes a first end face 32 and a second end face 33, and a side surface connecting the first end face 32 and the second end face 33; the side surface is formed with a winding surface 320, and a chute surface 310 is connected between the winding surface 320 and the first end surface 32. The thrust washer 3 is designed mainly for protecting an oil seal, a wire storage groove is formed by the winding surface 320 and the propeller 2, and a winding object can slide into the designed wire storage groove through the guiding action of the inclined groove surface 310, so that the phenomenon that the winding object is involved in the oil seal in the running state of the machine to cause the burning of the oil seal to cause sealing failure is avoided. For details, please refer to the foregoing description, which is not repeated herein.

Further, the first end face 32 is adapted to abut against the propeller 2, and the second end face 33 is adapted to abut against the motor. For details, reference is made to the foregoing description, which is not repeated herein.

Further, the chamfered surface 310 is a flat surface, and the circumference of the thrust washer 3 at the chamfered surface 310 is gradually reduced along the direction from the first end surface 32 to the second end surface 33. For details, please refer to the foregoing description, which is not repeated herein.

The above description is only for the purpose of illustrating embodiments of the present application and is not intended to limit the scope of the present application, and all modifications of equivalent structures and equivalent processes, which are made by the contents of the specification and the drawings of the present application or are directly or indirectly applied to other related technical fields, are also included in the scope of the present application.

Claims

1. A marine propulsor, characterized in that it comprises:

the motor comprises a motor shell and a motor shaft, and the motor shaft extends out of the motor shell;

a propeller connected to the motor shaft;

the thrust washer is sleeved on the motor shaft and positioned between the motor shell and the propeller; the side surface of the thrust washer is provided with a winding surface;

a gap is formed between the propeller and the motor shell at the periphery, a gap covering wall is arranged on the propeller, and the gap covering wall is positioned between the gap and the winding surface; the gap shielding wall is used for shielding the gap opening.

2. Marine propulsor in accordance with claim 1, wherein the projection of the clearance opening in the direction perpendicular to the central axis of the motor shaft falls entirely on the blanking wall.

3. The marine propulsor of claim 1 wherein said thrust washer further includes a first end surface abutting said propeller and a second end surface abutting said motor housing, said side surfaces being connected between said first and second end surfaces; an inclined groove surface is connected between the winding surface and the first end surface.

4. A marine propulsor as claimed in claim 3 wherein said slash face is planar and the circumference of said thrust washer at said slash face decreases in a direction from said first end face to said second end face.

5. A marine propulsor as claimed in claim 3 wherein said wire winding surface is parallel to the central axis of the motor shaft and said ramp surface is inclined to the central axis of the motor shaft.

6. The marine propeller of claim 3, wherein the thrust washer includes a winding post, an installation part connected to the periphery of the winding post, and an inclined plane plate, the installation part and the inclined plane plate are respectively located at two ends of the winding post, the side surface of the winding post serves as the winding surface, the installation part is used for being connected with the motor casing, the inclined plane plate abuts against the propeller, and the surface of the inclined plane plate departing from the propeller serves as the inclined groove surface.

7. The marine propeller of claim 6, wherein the inclined plate includes a spacing groove provided along a circumferential direction of the winding post, and a projection of the mounting portion along a central axis direction of the motor shaft falls into the spacing groove.

8. A marine propulsor in accordance with claim 1 wherein said motor housing further includes an oil seal structure disposed between said motor shaft and said motor housing; the thrust washer cover is arranged on the oil seal structure.

9. The marine propulsor of claim 8 wherein the motor housing is formed with an oil seal mounting groove and a gasket mounting groove, the oil seal structure being disposed in the oil seal mounting groove, the thrust gasket being removably mounted in the gasket mounting groove and covering the oil seal mounting groove.

10. The marine propulsor of claim 9 wherein said thrust washer includes a first end abutting said propeller and a second end abutting said motor housing, said wire winding surface being connected between said first end and said second end; the second end portion is located in the gasket mounting groove, and the depth of the gasket mounting groove is greater than the height of the second end portion; the propeller and the top end of the gasket mounting groove form the clearance opening.

11. A thrust washer for use between a motor and a propeller; the thrust washer includes a first end face and a second end face, and a side surface connecting the first end face and the second end face; the side surface is formed with a winding surface, and a chute surface is connected between the winding surface and the first end surface.

12. The thrust washer of claim 11, wherein said first end face is for abutting said propeller and said second end face is for abutting said motor.

13. The thrust washer of claim 11, wherein the chamfer face is planar, and wherein a circumference of the thrust washer at the chamfer face decreases in a direction from the first end face to the second end face.