JPS6044606A - Vibrating fluid power motor - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates generally to fluid motors, and more particularly to fluid-operated vibratory reversing motors that provide reciprocating rotational motion during a fraction of a complete revolution.

This type of motor is particularly useful for pushing, pulling, or reciprocating a member, opening or closing a valve, transmitting force, imparting periodic motion, positioning, or other functions. It can be used for many purposes such as. Such actuators generally have a chamber in the housing head in which the blades are moved in one direction and then in the other.
is moved in the other direction to impart rotational motion to the cooperating shafts over a portion of one complete revolution. In such devices, the vanes are moved back and forth by applying fluid pressure to one side of the piston or vane within the chamber while simultaneously expelling fluid from the opposite side.

Previous constructions in such rotary actuators required frequent maintenance and replacement due to wear, especially under aggressive operating conditions.In particular, replacing seals was essential to minimizing fluid leakage. This means that the system can be operated satisfactorily by using the air system.
0.1 cubic feet per minute; in some cases the leakage rate is significantly higher.

Although there are various prior art devices, in such devices in pneumatic systems, the pressure required to move the shaft is excessive due to the friction created by the sealing device.

One prior art device is U.S. Pat. No. 3,12 B, 67
No. 9, this patent shows a rotating device having a vaned chamber and a sealing device that includes an internal seal formed around the inner end of a shaft bore through which the shaft passes through the head of the device.

A similar device is shown in US Pat. No. 2,735,406. In both devices, a shaft seal is positioned within a hole provided for the power shaft to pass through, and it is found that such devices create a leakage path for the working fluid, further increasing the resistance to movement of the shaft.

Other constructions of vane actuators are shown in U.S. Pat. No. 3.1'31,610 and U.S. Pat. No. 6,179,020; In this case, a seal is provided between each part of the split blade.

a cylindrical body with head means at each end, the head means including an opening for receiving the shaft of the actuator, and an annular seal provided on the inner surface of each head means to define an enlarged portion of the shaft and an edge of the vane. There is no prior art known to provide an actuator that abuts the end of a seal provided around the actuator. Still further, a seal for an actuator that does not require reinforcement or backing support to prevent the seal from rolling or twisting under dynamic conditions applied to vanes or stator members in rotary actuators. There is nothing in the prior art that shows this.

The present invention includes a shaft movable between the first and 20th positions over less than one complete revolution, and the present invention provides a fluid powered system that minimizes the amount of leakage from the device while minimizing the force required to move the shaft. A novel sealing device for an actuating device is provided.

More particularly, the present invention provides a fluid powered actuator having a cylindrical body with head means at each end.

Furthermore, the present invention provides a fluid powered actuator which has a leakage rate of significantly less than 0.1 cubic feet per minute and which requires less force for actuation, particularly less release torque. . Still further, the present invention has a cylindrical body defining a chamber and a central aperture disposed at each end of the body in sealing relationship therewith, each in aligned relationship with the longitudinal axis of the body, the apertures being spaced apart therefrom. first and second head members having a first annular groove surrounding the opening and a supporting inner surface on the side exposed to the chamber, a ring means disposed in the first annular groove, and an inner surface of the body; 1 including first and second ends positioned within the chamber and spaced apart from the bearing surfaces of the first and second heads 9, and an outer edge extending parallel to the longitudinal axis of the body. at least one elongate stator having a stator groove at first and second ends and around an outer edge; the first end and the second head opening received in the opening of the first head 9; a rotor including shaft means rotatably housed in the stator and including an enlarged portion forming a circumferential bearing surface extending generally between the first and second head members with a circular cross-section of a diameter greater than the diameter of the shaft, the bearing surface being a stator; a rotor in selectively spaced and parallel relationship with an outer edge of the enlarged portion, each end of the enlarged portion respectively contacting a portion of one of the ring sealing means of the first and second heads; at least one vane member extending and having a vane groove on its outer periphery and received in the vane groove for contacting the first and second heads, the inner surface of the body and a portion of the ring seal of each head to form a fluid seal; a vane sealing means adapted to contact the first and second heads and the enlarged portion and received in the stator groove for forming a fluid seal between the stator and the enlarged portion of the shaft and the head member; A vibratory fluid powered motor is provided which includes a stator sealing means as such and a fluid inlet and outlet extending into a chamber to selectively vary the pressure on either side of the vanes to move the vanes and rotate the shaft.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

Referring to FIG. 1, which shows an exploded view of one embodiment of a 90° rotation according to the invention, a cylindrical body 1 is shown exploded to form an interior chamber 2 for housing the components shown. .

Although the body 1 can be made of any suitable material, hardened anodized aluminum has been found to be a very satisfactory material.

Furthermore, it has been found that the unique sealing system of the present invention provides significant cost savings compared to prior art systems that require special tolerance tubes. A head 6.7 is provided at both ends of the main body 10 and includes an annular groove 8 (the corresponding annular groove and internal shape of the hendro are not shown, but the heads 6.7 are symmetrical to each other, and the head 6 receives the head 7. This annular groove is adapted to receive the sealing ring 16 (as it should be understood that it is adapted to be received at the opposite end of the body 1). A second internal groove 9 is provided in each of the heads 6.7, which groove accommodates a sealing ring 11, which will be described below. The inner groove 9 of each head forms an inner support surface 10 which accommodates the rotor and stator blade seals described below.

A center hole 16 is provided in each head 6.7 as shown, and when assembled these center holes 16 are arranged longitudinally to accommodate the ends of a shaft 610, which will be described below. Each of the central holes 16 of each head 6.7 is provided with an internal groove 60 for receiving a Q-ring seal filter QA to prevent the entry of bullets or other contaminants.

An annular groove 9 (shown in head 7) in each head 6.7 is arranged in spaced relation from the center hole 1. Aligned holes 17 in each head 6.7 accommodate columns arranged side by side in conjunction with the stator assembly, also described below. Each head 6.7 also has fluid inlets and outlets 15.- 15A is provided which communicates with chamber 2 when the components are assembled to allow selective entry and exit of the working fluid.
is shown communicating with the entrance/exit 15A'. Similar fluid inlets and outlets are provided in head 1, but only inlet 15 is shown in FIG.

The rotor assembly 66 is, for example, provided with vanes 67 which extend outwardly from the enlarged portion 64 of generally circular cross section and are supported by the shaft filter 1. Although FIG. 1 shows a specific example having two blades, a specific example having one blade is also within the scope of the present invention.

The surface of the enlarged portion 64 forms the stator vane sealing surface and extends along a portion of the length of the shaft filter 1 , the length of the enlarged portion 54 being approximately equal to the length of the body 1 , so that the enlarged portion 34
The ends 54A, 54B abut the seals 11 of the head 6.7 when the components are assembled, as will be described below. Each vane 7 includes a groove 8 around its free periphery and is adapted to accommodate a groove-shaped sealing member 28, which will be described later. In the illustrated embodiment, cross-over holes 24A-24B extend through enlarged filter 4 and shaft 61 to facilitate the application of fluid pressure, as will be described below.

A pair of stators 21 are fixed to both sides of the main body 1, and have free edges at both ends (these free edges are respectively positioned near the heads 6 and 7 in the assembled state), as shown in the figure. and an outer edge (positioned near the surface of the enlarged portion in the assembled state). Each stator 21 is positioned in a parallel relationship with the longitudinal axis of the main body 1 and is fixed to the main body 1 by a screw 3A.
is housed within. Each stator 21 has approximately the same length as the main body 1, and a gasket 22 is housed between the inner surface of the stator 21 and the main body 1 to prevent fluid from leaking from holes provided in the main body 1 to receive screws 6A in the main body 1. prevent. Each stator 21 is also provided with a peripheral groove 23 on its free edge and outer edge for receiving a groove-shaped sealing member 283 similar to the sealing member 28 accommodated in the groove 68 of the vane 67. Lengthwise extending grooves 25 are provided on each side of each stator 21, one groove 250 being positioned in line-up relationship with the head 6.70 one inlet/outlet 15A to selectively direct fluid into the chamber 2, as described below. Facilitate entry and exit. A post 26 is provided at the end of each stator and the alignment hole 1 of the head 6.7
7 (the hole 17 of the head 7 is not shown).

When the components are assembled as shown in FIG. 1, the threaded end 27A is screwed into the screw hole 7A of the head 7, and the body 1 is inserted between them, and the threaded end 27A extends between the navel 6.7. A nut 27B is screwed onto the attached end 27G.

FIG. 2 shows the apparatus shown in FIG. 1 in an end view with the head 6 omitted, so that the stator assembly 21 is shown in a vertical position and the end of the assembled rotor 6 is connected to the vanes 67.
is shown in horizontal position.

FIG. 2 shows one embodiment of the present invention in which fluid pressure within chamber 2 aids in sealing.
Two characteristics are indicative. In FIG. 2, chambers A, B, G, and D formed by the blade filter 7 and the stator 21 are shown. In the illustrated structure (*), for purposes of illustration, fluid is supplied from the inlet/outlet 15A to the chamber A as indicated by the arrow E, is extracted through the cross-hole 24A, and then fluid enters the chamber as indicated by the arrow E1. It is assumed that the blade roller 7 is rotated counterclockwise.

A valve seal 28 is disposed along the outer periphery of the seal, which will be described later, with lips 28A-28B pressed against the body 1.

The action of the seal is indicated by arrow E2. Seal 28, described below, includes grooves 28A1, 28B1 forming lips or wings 28A on its outer surface.

The blade 67 is rounded with a space from the inner surface of the main body 1 L7
edge 67A (having the same radius as the radius of the main body 1)
, so that fluid flows between the main body 1 and the blade edge 67A to generate fluid pressure, for example, between the groove 28B1 and the lip 28B.
It will also be appreciated that the underside of the body 1 forms a flange which brings the lip 28 into sealing relation to the surface of the body 1. A similar relationship is established in the chamber of the lip 28AS of the stator 21.
This also occurs in sealing the lip 28BS of the seal 28S of the stator 21 in the chamber A and also in sealing the lip 28A of the vane 67 in the chamber A. It will also be understood that when fluid is applied to chambers B and C and the blades are rotated clockwise, the two seals facing each other become hermetically sealed.

Another feature of the invention is that a base 2 for each vane seal 28 is provided.
9 is provided which engages a portion of a ring seal 11 (Hendro's seal 11 is shown in dotted lines in FIG. 2) to seal as shown in FIG.

FIG. 2 also shows that the ring seal 11 engages the base 29 of the seal 2B of the vane 37 and a portion of the enlarged portion of the vane assembly slot 6.

FIG. 2 also shows the relative positions of the grooves 25 provided to allow fluid to flow into the chambers A and B in order to move the vanes 37 and rotate the shaft filter 1.

Referring to FIG. 6, the engagement between the vane seal 2B, head 6 and body 1 is shown. In FIG. 6, the lip 28A of the seal 28 of the vane 67 is located at
0 is shown in a sealed relationship.

FIG. 6 also shows a hole 9 in spaced relation to the hole 16.
The engagement between the ring seal 11 housed therein and the base 29 of each seal 28 is shown. FIG. 6 also shows ring seal 11 engaging a portion of the end of enlarged portion 34 of rotor assembly 66 to form a seal, thus
It is also shown that there is no need to form a seal directly around the shaft 61 as in the prior art. 60 can also be provided in the head 6.7.

As can be seen in FIG. 4, the end 2 of the stator assembly 21
1A is located near the enlarged portion 64 of the shaft filter 1.

As described above, the seal 11 is connected to the outer periphery of the shaft assembly 66 and the lip 28A of the stator seal 28S of the stator 21.
This indicates that the government will collide with S and 28BS to conduct secret control.

FIG. 4 is a partial longitudinal cross-sectional view taken along line 4--4 in FIG.
The outer surface of the main body 1 and the head 6 are shown engaged with each other.

The main body 1 is shown positioned within the groove 12 of the head 6 together with the stator 21 as shown. Also shown, ring seal 11 is shown disposed within groove 9 of head 6 with stator seal 288 pressing lip 28AS against enlarged portion 64 of shaft assembly 66. The seal 283 is shown engaged with the inner surface of the head 6 and the inner surface of the body 1 at their connections. Furthermore, the ring seal 11 is connected to the lip 28 of the seal 283.
It can be seen that it is involved in AS.

FIG. 5 is an enlarged view of the seal 28 of the present invention described above to show the lips 28A, 28B in detail.

It should be recognized that seal 283 is similar to seal 28 and has been given a different number for clarity of explanation. Furthermore, base 29 is shown including a surface 41 on which ring seal 11 (and head 6.7 when seal 28S is used in a stator) engages as described above.

Grooves 28A1, 28B1 are formed below the lips 28A, 28B, respectively, to form a seal of the character described above. It will be appreciated that similar results can be obtained in stator and vane applications to seal the lips to sludge. With the structure shown in the figure, a uniform load is applied to the seal in six directions.
It has been found that the vanes 67 shown in the figure provide a uniform and effective seal between the head 6.7 and the body 1, while the stator 21 shown in FIG. 4 provides a honeymoon between the enlarged portion 64 and the head 6.7.

Furthermore, a sealing beat ''46 is provided on the underside of the seal 28 as shown in detail in FIG.
6 seals the groove 68 of the blade 67 shown in FIG.
This facilitates sealing the groove 28 of the stator 21 shown in the figure.

To operate the device for 900 revolutions as shown in FIGS. 1 and 2, a working fluid is allowed to flow between the opposite sides of the chamber formed by the body 1 and the transverse holes 24. It is necessary in some applications to provide means. If the shaft is of the type with enlarged portions as described above, the shaft itself can form a leakage path for conducting pressurized fluid between the cross-holes.

FIG. 6 shows the shaft assembly in a perspective exploded view with the shaft 31 provided with a knurled portion 51. In FIG. 6, the vane assembly 36 is shown removed and the vane assembly, including the enlarged portion 64 supporting the vane 67, is shown on the shaft 3.
Press fit around 1. The shaft 61 is also provided with a groove 62 containing a "0" ring (not shown) to prevent fluid from flowing laterally between the cross-holes 24 (if provided) so that these cross-holes are enlarged. Perforations are provided across portion 64 and shaft 61 to extract fluid from one side of the vane assembly to the other in some applications, as described above.

Accordingly, in accordance with another feature of the invention, it has been found that a shaft assembly of the type shown in FIG. 6 satisfactorily prevents such leakage of fluid.

An example of the use of a shaft of the type shown in FIG. 6 in a device of the type shown in FIG. 1 is shown in FIGS. 7A-7B. 7th
In the example shown in Figures A-7B, a shaft assembly 62 including a body 61 and vanes 66 is shown generally vertically oriented, as is the stator assembly 64.64A previously described. In the moat 9 shown in FIG. 7A, a pressurized fluid, for example air, is supplied to the cooperating chamber G to rotate the blade assembly 62 including the enlarged portion 66 in the direction shown by the arrow H, and the air is supplied to the shaft 62. It flows through the cross hole 62A into the chamber (2) and rotates the shaft in the direction shown, increasing the area where the force is exerted. Air is exhausted from the chamber 6o between the vanes 66 and the stator 64 through a conduit 68.

In the mode shown in FIG. 7B, pressurized air is supplied to chamber J by conduit 68 and air is supplied to chamber J by another bleed hole 68 as shown.
The flow blade assembly is rotated in the direction shown by the arrow.

In the specific example described above and the specific example described later, when air is supplied to the chamber and the blade is rotated in one direction, a means (not shown) is provided for discharging the air from the chamber on the low pressure side of the moving blade. (I can understand that.

FIG. 8A shows one embodiment of the present invention that rotates through an angle of less than 6600, or 27o0, in which only one vane 71 is provided on one stator member 72.
A shaft 76 having an enlarged portion 73A is attached to the main body 7.
It is located within 4. Fluid is co-supplied in the direction indicated by arrow M, causing the vanes 71 to rotate in this direction, and then supplied to the opposite side of the stator 72 as shown in Figure 8B (in this example, fluid is supplied to the heads on both sides of the stator 720) (It will be recognized that the blades can be rotated in both directions)
.

9A-9B show an example in which the main body 81 rotates over 18o0, and in this example, the main body 81 is provided with stators 82, 86. A shaft 84 is provided having the aforementioned enlarged portion 86 supporting a vane 87 having a seal 88 . An inlet 89 is provided in stator 82, a fluid inlet 89A is provided in stator 86, and
The vanes 87 thus rotate in a direction determined by the inlet receiving pressurized fluid.

It has been found that the moon device of the present invention, as described above, maximizes the peeling torque and thus reduces the fluid pressure and allows for a smaller amount of leakage than in the prior art, thereby providing efficient rotational movement of the blades.

FIG. 1 shows an L-shaped banno ξ9 as another feature of the present invention.
1.92 is shown with the bumper 92 placed within the groove 25. The second bumper 91 is shown separated from the groove 25A to show the shape of the bumper. Bumpers 91,92 are made of a resilient nystomeric material, for example grooves 25'
A can be placed at the open end of the groove 25A and held in slight compression within the groove and then moved longitudinally within the groove 25A to the desired location. Bumpers 91,92 are shown contained within the stator to retard the movement of the blades 67 at the end of their movement and to absorb the kinetic energy of the blades and prevent damage to the blades, stator, or both. Furthermore,
Using a bumper as shown allows the device to operate noiselessly.

Those skilled in the art will understand that what has been described above is merely illustrative of the present invention, and upon reading the above description, other embodiments may be made within the scope of the present invention.

[Brief explanation of drawings]

FIG. 1 is an exploded view of a motor according to one specific example of the present invention;
2 is an elevational view of the motor of FIG. 1 shown in an assembled state with the head 6 omitted, FIG. 6 is a sectional view taken along line 6-6 in FIG. 2, and FIG. 2 is a cross-sectional view taken along line 4-4 in FIG. 2, FIG. 5 is a partial cross-sectional perspective view of a vane seal according to the present invention, and FIG. 6 is an isometric view of an example of a rotor according to the present invention. The perspective exploded view, FIGS. 7A-7B, shows the 90 according to the present invention.
Figures 3A-8B are sequential diagrams illustrating the operation of the device of the invention for rotating the shaft by 270°; Figures 9A-9B are for rotating the shaft by 180° or less; 1 is a sequential diagram of the device of the invention; FIG. 1... Main body, 2... Chamber, 6, 7... Head member,
8... First annular groove, 10... Support surface, 11...
Ring means, 16...center opening, 15A-15B-.
- Inlet and outlet, 21... Stator, 28... Vane seal, 288... Stator seal, 31...
Shaft, 64... Enlarged part, 36... Rotor, 6
7...Blade member, filter 8...Blade groove. Patent applicant Berel 2-M Netherlands Sheep Bestroten Fuenotschaft (4 others) J Ail AN Engraving of drawings (no change in content) Mori ζ IG3 IG 4 Procedural amendment January 1982/ / Day 2, Name of the invention: Vibratory Fluid Dynamic Camotalo, Relationship to the case of the person making the amendment Patent applicant's address name: Haelpaem Neetherlands Bestroten Fennotschaft 4, Agent 5, Subject of the amendment

Claims (1)

[Scope of Claims] (1) A cylindrical body forming a chamber;
a first annular groove having a central aperture arranged one after the other, each aligned with the longitudinal axis of the body, each central aperture surrounding it in spaced relation; first and second head members having inner bearing surfaces exposed to the chamber; ring means disposed within a first annular groove; and ring means positioned on an inner surface of the body and extending into the chamber. 1 including first and second ends and an outer edge extending parallel to the longitudinal axis of the body spaced apart from the bearing surfaces of the first and second head members;
and at least one elongated stator having a stator groove disposed about the second end and an outer edge thereof, the first end and the second head received in the opening of the first head member. a second end rotatably received in the opening of the member and a peripheral bearing surface extending generally between the first and second head members with a circular cross section and a diameter greater than the diameter of the shaft; an enlarged portion forming an enlarged portion, the bearing surface being in a selectively spaced parallel relationship with an outer edge of the stator such that each end of the enlarged portion contacts a ring sealing means of the first and second head members, respectively; at least one vane member extending radially from said enlarged portion having a vane groove in its outer periphery; first and second vane members disposed on bearing surfaces of first and second head members; a second head member; vane seal means adapted to be received in a vane groove forming a fluid seal for contacting the inner surface of the body and a portion of the ring seal of each head member near the enlarged portion of the stator; Stator seal means adapted to be received in the stator groove for contacting the first and second head members and the enlarged portion of the shaft to form a fluid seal between the stator, the enlarged portion of the shaft and both head members. and a fluid inlet and a fluid outlet extending into the chamber to selectively vary fluid pressure on opposite sides of the vanes to move the vanes and rotate the shaft. the bearing surface of the head member being flat, the vane means being rectangular in shape, and vane seals extending outwardly from each other at opposite ends of the web portion and spaced apart from each other and being received in the vane grooves; a piece of channel-shaped molded nidistomer material having a second leg portion, the outer surfaces of the first and second leg portions contacting the bearing surfaces of the first and second head members and the web portion; The motor according to claim 1, wherein the outer surface of the motor is in contact with the inner surface of the main body. 3. The motor of claim 4, wherein the first and second leg portions of the vane seals have enlarged portions at their free ends that engage ring seals of the respective head members. (4) Each of the first and second head members includes second groove means spaced apart from the first annular groove and adapted to receive opposite ends of the body. Section motor. (5) The motor according to claim 6, wherein each supporting surface of the first and second head members is formed between the second groove and the central opening. (6) The motor of claim 1, wherein the first and second vanes extend from the shaft through the chamber and into the main body. (7) the vane seal has a generally rectangular cross-section and engages the outer surfaces of the first and second leg portions with the bearing surfaces of the first and second head members and the web portion with the inner surface of the body; 3. A motor according to claim 2, including at least one outwardly extending lip-like means. (8) Bead means provided on one side of at least one of the vane seals received in the vane grooves so as to engage one side of the vane grooves to form a seal.
Section motor. (9) first groove means disposed on the side of the vane seal in the vicinity of the lip-like means, the first groove means receiving fluid at a selected pressure to cause the lip-like means to co-operate in the vicinity; 2. A motor according to claim 1, wherein the motor is adapted to be brought into sealing relationship with the surfaces thereof. 00) The head member has a flat bearing surface, the stator means has a rectangular cross-section, and the vane means extend outwardly from the web portion and the ends of the web portion at a distance from each other and are received in the stator grooves. and a second leg portion, the channel-shaped piece of molded elastomeric material having a first
The motor of claim 1, wherein the outer surfaces of the second leg portions contact the supporting surfaces of the first and second head members, respectively, and the outer surfaces of the web portions contact the inner surface of the main body. 11. The motor of claim 10, wherein the first and second legs of the stator seal include enlarged portions at their ends that engage the inner surfaces of the body and head members at the junction of the heads. (12) a stator seal having at least one outer surface having a generally rectangular cross section that engages the head member on outer surfaces of the first and second leg portions, respectively, and that engages a surface of the bearing surface around the enlarged portion on the web portion; 12. A motor according to claim 11, further comprising heat-containing lip-like means extending toward the motor. 03) The motor of claim 10, further comprising beat 9 means provided on at least one surface of a stator seal housed in the stator groove and engaging one side of the stator groove to form a seal. (14) a seal member adapted to be received in a circumferential groove in the outer surface of a generally planar vane of a selected geometry which is received in a casing of similar interior geometry; the sealing member has a generally rectangular cross-section and at least one lip-like means extending outwardly to engage an inner surface of the casing and a lip-like means adapted to receive fluid supplied to the casing at a selected pressure. and at least one lip-like means for sealingly engaging the means with the casing. (15) The seal member of claim 14 including outwardly extending bead means extending along one side of the seal received in the groove of the vane to form a seal between the groove and the seal member. . α6) The seal member of claim 14, wherein the vanes are generally rectangular and the seal is channel shaped with first and second leg portions supported at opposite ends of a selected length of web portion. lη The stator includes second groove means extending longitudinally along a portion of one side of the stator having a fluid inlet near one of the first and second head members; 18. The sealing member of claim 17, wherein the head member has fluid flow opening means in communication with the inlet means of the second groove.08) The stator means is located on the opposite side of the stator from the second groove means. a sixth groove means positioned at and extending longitudinally along a portion of the stator; bin means received in one end of the sixth groove and extending longitudinally therefrom;
or a hole means provided in the second head and accommodating a hole means for arranging the stator with respect to the first or second head member. α9) Claims comprising energy absorbing pad means supported on at least one of the second and sixth groove means such that the vane means engage when the rotor rotates to one limit of motion. Seal member according to paragraph 18. (2) The rotor has at least two radial holes extending in intersecting relationship between the enlarged portion and the shaft in longitudinally spaced relation along the shaft and positioned on opposite sides of the nucleation. The motor according to claim 1, comprising shaft groove means and rOJIJ seal means positioned in the groove means, and wherein the portion of the shaft having the hole is covered by an enlarged portion. (21) Covered by the enlarged portion. 21. The motor of claim 20, wherein the shaft portion is provided with straight serrations oriented parallel to the longitudinal axis of the shaft.