US20060186605A1 - Seal structure for relatively rotational members - Google Patents
Seal structure for relatively rotational members Download PDFInfo
- Publication number
- US20060186605A1 US20060186605A1 US11/408,398 US40839806A US2006186605A1 US 20060186605 A1 US20060186605 A1 US 20060186605A1 US 40839806 A US40839806 A US 40839806A US 2006186605 A1 US2006186605 A1 US 2006186605A1
- Authority
- US
- United States
- Prior art keywords
- seal
- seal structure
- bearing
- dust cover
- cylindrical member
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
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Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/72—Sealings
- F16C33/76—Sealings of ball or roller bearings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/72—Sealings
- F16C33/76—Sealings of ball or roller bearings
- F16C33/80—Labyrinth sealings
- F16C33/805—Labyrinth sealings in addition to other sealings, e.g. dirt guards to protect sealings with sealing lips
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D27/00—Magnetically- or electrically- actuated clutches; Control or electric circuits therefor
- F16D27/10—Magnetically- or electrically- actuated clutches; Control or electric circuits therefor with an electromagnet not rotating with a clutching member, i.e. without collecting rings
- F16D27/108—Magnetically- or electrically- actuated clutches; Control or electric circuits therefor with an electromagnet not rotating with a clutching member, i.e. without collecting rings with axially movable clutching members
- F16D27/112—Magnetically- or electrically- actuated clutches; Control or electric circuits therefor with an electromagnet not rotating with a clutching member, i.e. without collecting rings with axially movable clutching members with flat friction surfaces, e.g. discs
- F16D27/115—Magnetically- or electrically- actuated clutches; Control or electric circuits therefor with an electromagnet not rotating with a clutching member, i.e. without collecting rings with axially movable clutching members with flat friction surfaces, e.g. discs with more than two discs, e.g. multiple lamellae
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
- F16J15/3248—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings provided with casings or supports
- F16J15/3252—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings provided with casings or supports with rigid casings or supports
- F16J15/3256—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings provided with casings or supports with rigid casings or supports comprising two casing or support elements, one attached to each surface, e.g. cartridge or cassette seals
- F16J15/3264—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings provided with casings or supports with rigid casings or supports comprising two casing or support elements, one attached to each surface, e.g. cartridge or cassette seals the elements being separable from each other
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2300/00—Special features for couplings or clutches
- F16D2300/08—Details or arrangements of sealings not provided for in group F16D3/84
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D27/00—Magnetically- or electrically- actuated clutches; Control or electric circuits therefor
- F16D27/004—Magnetically- or electrically- actuated clutches; Control or electric circuits therefor with permanent magnets combined with electromagnets
Definitions
- the present invention relates to a seal structure for relatively rotational members to be employed between a rotary member, such as a coupling exposed to and connected to a propeller shaft of a four-wheel drive vehicle, and a stationary member that retains the rotary member to a vehicle body.
- the housing that forms the rotary member
- the aluminum alloy has a low hardness to cause a sliding portion between the seal member and the housing to be easily worn, resulting in an issue of an inability of easily determining the sliding portion.
- an object of the present invention to provide a seal structure which is disposed between a rotary member, which is located to be exposed outside, and a stationary member, and which has an increased sealing performance. It is another object of the present invention to provide a seal structure which enables the rotary member to be made of light material without increasing the number of component parts. It is another object of the present invention to provide a seal structure which is capable of miniaturizing a device involving the seal structure. It is a further object of the present invention to provide a seal structure which is capable of decreasing costs of a device involving the seal structure. It is a further object of the present invention to provide a seal structure which, when installed in a vehicle, enables fuel consumption to be improved.
- a seal structure for sealing a gap between a first member and a second member disposed to be rotational relative to the first member, the seal structure comprising: a cover member preventing foreign material from entering the gap; and a seal member fixedly secured to at least one of the first and second members and held in sliding contact with the cover member to seal the gap.
- seal structure With the seal structure according to the first aspect of the present invention, arranging the seal member to be held in sliding contact with the dust cover (cover) mounted to a rotary component (second member) of the rotary member prevents the rotary component from directly sliding with the seal member.
- the rotary member can be made of light metal to cause the rotary member to be light weighted to lower a momentum of inertia for thereby enabling a fuel consumption (drive power consumption) of an engine (prime mover) to be improved.
- the dust cover as a member with which the seal member slides enables the seal structure to be obtained, which is more simplified in structure than the related art seal structure (with no need for a specific consideration in design to form the sliding portion on the rotational member) while enabling reduction in the number of component parts.
- the seal structure is suffice to have a narrower mounting space than that of the structure in which the seal member and the dust cover are separately located, resulting in a compact structure and light weight of the entire structure of the rotary member involving the dust cover.
- the freedom of selecting material of the rotary member is increased and, therefore, it is possible for the rotary member, which is made free from sliding the seal member, to be made of, in addition to light metal such as aluminum alloy, other material such as plastic resin provided that a desired strength is obtained.
- a second aspect of the present invention concerns a seal structure for sealing a gap between a first member and a second member disposed to be rotational relative to the first member, the seal structure comprising: a seal member disposed between the first member and the case-like torque transmitting member; wherein the second member includes a case-like torque transmitting member; wherein the case-like torque transmitting member is supported with the first member via a bearing at a position in the vicinity of the seal member within an area axially inward of the first member along a rotational axis of the case-like torque transmitting member; and wherein the seal member has a sliding radius of curvature smaller than a rotating radius of curvature of the bearing.
- seal member is selected from general-purpose seal members for preference.
- selecting the sliding radius of curvature of the seal member to be in a small value enables a peripheral speed to be decreased with a resultant further improvement in the sealing capability.
- FIG. 1 is a skeleton structural view illustrating a power transmission system of a vehicle installed with an electromagnetic coupling employing a seal structure of a first embodiment according to the present invention.
- FIG. 2 is a cross sectional view illustrating the electromagnetic coupling employing at the seal structure of the first embodiment according to the present invention.
- FIG. 3 is a cross sectional view illustrating an essential part of the seal structure of the first embodiment shown in FIG. 1 .
- FIG. 4 is a cross sectional view illustrating an essential part of a seal structure of a second embodiment according to the present invention.
- FIG. 5 is a cross sectional view illustrating an essential part of a seal structure of a third embodiment according to the present invention.
- FIG. 6 is a cross sectional view illustrating an essential part of a seal structure of a fourth embodiment according to the present invention.
- FIG. 7 is a cross sectional view illustrating an essential part of a seal structure of a fifth embodiment according to the present invention.
- FIG. 8 is a cross sectional view illustrating an essential part of a seal structure of a sixth embodiment according to the present invention.
- FIG. 9 is a cross sectional view illustrating an essential part of a seal structure of a seventh embodiment according to the present invention.
- a seal structure of an embodiment according to the present invention is described below with reference to FIGS. 1 and 9 .
- FIG. 1 is a skeleton structural view illustrating a vehicle power transmission system incorporating an electromagnetic coupling that employs the seal structure of the embodiment according to the present invention.
- the vehicle power transmission system shown in FIG. 1 is shown as including a transversely installed engine (prime mover) 300 , a power transmission 301 , a transfer unit 303 , a directional change-over gear mechanism 304 disposed inside the transfer unit 303 , a front differential gear (differential unit for distributing a drive power output of the engine to right and left wheels) 305 , right and left front wheels 306 , 307 , a propeller shaft 308 , an electromagnetic coupling 1 , a drive pinion gear 309 , a rear differential gear 310 , a ring gear 311 , right and left rear wheels 312 , 313 and a differential carrier 314 .
- a transversely installed engine (prime mover) 300 a power transmission 301 , a transfer unit 303 , a directional change
- the drive power output of the engine 301 is transmitted to a differential case of the front differential unit 305 from an output gear of the power transmission 301 , from which the drive power output is distributed over the right and left front wheels 306 , 307 via front wheel axles.
- the drive power output of the engine 301 is transmitted through the propeller shaft 308 and a drive pinion 309 to the rear differential unit 310 , from which the drive power output is further distributed via the rear differential unit 310 to the right and left rear wheels 312 , 313 to render a vehicle to be operative in a four-wheel drive mode.
- the electromagnetic coupling 1 is uncoupled, the component parts subsequent to the propeller shaft 308 are disconnected to render the vehicle to be operative in a two-wheel drive mode.
- the electromagnetic coupling 1 serves as a clutch structure that is located in a rear power transmission line, closer to the rear wheels 312 , 313 , to be disconnected during a two-wheel drive mode in a four-wheel drive vehicle and executes control of coupling or uncoupling the power transmission line associated with the rear wheels 312 , 313 while performing control of the drive power output to be transferred to the rear wheels 312 , 313 .
- the propeller shaft 308 is shown in a simplified form in FIG.
- the propeller shaft that forms a part of the rear power transmission line, is connected through a joint portion to the electromagnetic coupling 1 which in turn is connected to a ring gear 313 of the rear differential gear 310 via a drive pinion gear 309 in meshing engagement.
- a left side of a structure shown in FIG. 2 corresponds to a front side (engine side) of such a vehicle.
- the electromagnetic coupling 1 has a bearing 25 and the seal structure of the present invention provided in a front direction of the vehicle.
- FIG. 2 is a cross sectional representation of the electromagnetic coupling incorporating the seal structure of the embodiment according to the present invention.
- the electromagnetic coupling 1 is shown as including a rotary case 3 (case-like torque transmitting member), an inner shaft 5 (shaft-like torque transmitting member), a multi-plate type main clutch 7 , a ball cam 9 , a pilot clutch 11 , an electromagnet 13 , a housing 14 (stationary member), a dust cover 15 , a seal (seal member) 17 , and a controller.
- the housing 14 is supported on a vehicle body by means of a support fixture, fixedly attached to a floor panel of the vehicle and a flexible support member.
- the rotary case 3 is comprised of a cylindrical member 19 (case-like torque transmitting member) formed with a bottom wall and made of aluminum alloy (non-magnetic material), and a rotor 21 , made of iron alloy (magnetic material), such as low carbon steel material, which is located at a rear side.
- the rotor 21 is screwed into a rearward opening portion of the cylindrical member 19 and is fixedly secured thereto by means of a locked nut function of a nut 23 .
- a front end of the cylindrical member 19 is supported with the housing 14 via the ball bearing 25 of a type sealed on both sides, and the rotor 21 is supported with the housing 14 via a ball bearing 27 of a type sealed on both sides and a core 29 of the electromagnet 13 .
- a companion flange is fixed to the front end of the cylindrical member 19 by means of a stud bolt 31 , with the companion flange being integrally formed with a joint fork of a coupling.
- the cylindrical member 19 is connected via this coupling to the transfer side propeller shaft to allow the drive power output of the engine to be transmitted through these power transmitting components to the cylindrical member 19 of the rotary case 3 .
- the inner shaft 5 is inserted through the cylindrical member 19 of the rotary case 3 from the rear side thereof, with a fore end of the inner shaft 5 being rotationally supported with the cylindrical member 19 via a bearing 33 while an aft end of the inner shaft 5 is supported with the rotor 21 via a needle bearing 35 . Further, the inner shaft 5 is axially positioned with respect to the rotary case 3 by means of snap rings 37 , 39 and the ball bearing 33 .
- a connecting shaft 41 (fore end of the drive pinion gear 309 ).
- the connecting shaft 41 is connected via a drive pinion gear 309 to a ring gear 311 , in meshing engagement therewith, of a rear differential unit 310 to rotationally drive the same.
- An O-ring 43 is disposed between the cylindrical member 19 of the rotary case 3 and the rotor 21 .
- an X-ring 45 that is a seal with an X-shape in cross section, is disposed inwardly of the needle bearing 35 between the rotor 21 and the inner shaft 5 .
- the tightly sealed rotary case 3 is filled with oil through an oil bore 47 formed in the cylindrical member 19 , with the oil bore 47 being sealed with a check ball 49 tightly fitted thereto after the oil has been charged. Further, the cylindrical member 19 is internally formed with a space 51 , that serves as an oil flow passage, at a position associated with the oil bore 47 .
- the main clutch 7 is disposed between the rotary case 3 and the inner shaft 5 , with outer plates 53 of the main clutch 7 being coupled to a splined portion 55 internally formed in the rotary case 3 (cylindrical member 19 ) while inner plates 57 of the main clutch 7 are coupled to a splined portion 59 formed on an outer periphery of the inner shaft 5 .
- the ball cam 9 is disposed between a pressure plate 61 and a cam ring 63 .
- the pressure plate 61 has an inner periphery coupled to the splined portion 59 of the inner shaft 5 to urge the main clutch 7 toward the rotary case 3 by the action of a cam thrust force exerted by the ball cam 9 to be brought into a coupled condition.
- the cam ring 63 is disposed on an outer periphery of the inner shaft 5 for relatively rotational movement, and disposed between the cam ring 63 and the rotor 21 are a thrust bearing 65 and a washer 67 which bear a cam reaction force exerted by the ball cam 9 .
- the pilot clutch 11 is disposed between the cylindrical member 19 of the rotary case 3 and the cam ring 63 , with outer plates 69 of the pilot clutch 11 being coupled to the splined portion 55 of the cylindrical member 19 while inner plates 71 of the pilot clutch 11 are coupled to a splined portion 73 formed on an outer periphery of the cam ring 63 .
- a core 29 of the electromagnet 13 is press fitted to a cylindrical bore 77 formed in the housing 14 , which supports the rotor 21 via the ball bearing 27 as set forth above. Further, the core 29 is inserted into a concave portion 79 , formed in the rotor 27 , with an appropriate air gap and is axially positioned with respect to the rotor 21 by means of snap rings 81 , 83 and the ball bearing 27 .
- a retaining member 87 engages a recess 85 formed in the core 29 and also engages an engagement portion 89 formed in the cylindrical bore 77 of the housing 14 to hold the electromagnet 13 (core 29 ) for a non-rotary capability.
- a lead wire 91 of the electromagnet 13 is clipped with the retaining member 87 and extends through a grommet 93 outside the housing 14 to be connected to a battery installed on the vehicle.
- the controller performs excitation of the electromagnet 13 , control of an excitation current and interruption of excitation.
- the ball cam 9 When the pilot torque is produced, the ball cam 9 is exerted with a thrust force from the rotary case 3 via the pilot clutch 11 and the cam ring 63 at a level depending on the magnitude of the pilot torque, thereby causing the main clutch 7 to be urged and coupled via the pressure plate 61 to allow the electromagnetic coupling 1 to be brought into a coupled condition.
- the pilot clutch 11 is enabled to obtain a given pilot torque such that the electromagnetic coupling 1 obtains a given magnitude of coupling torque.
- the drive power output of the engine is transmitted from the inner shaft 5 to the rear differential unit via the rear-differential side propeller shaft whereupon the drive power output is distributed with the rear differential unit to the right and left rear wheels to allow the vehicle to be brought into the four-wheel drive condition, resulting in an improved rough road covering property and stability of the vehicle body.
- the distribution ratio of the drive power output between the front and rear wheels can be arbitrarily controlled such that, when implementing such a control during a turning travel, an improved drivability and stability of the vehicle can be obtained.
- the pilot clutch 11 is uncoupled to cause the thrust force of the ball cam 9 to be lost, with a resultant uncoupling of the main clutch 7 to cause the electromagnetic coupling 1 to be brought into the uncoupled condition.
- the electromagnetic coupling 1 is uncoupled, the rear-differential side propeller shaft and the rear wheels are disconnected from the front propeller shaft to allow the vehicle to be brought into the two-wheel drive condition for driving only the front wheels, resulting in an improved fuel consumption of the vehicle.
- the hollow inner shaft 5 is separated with a wall portion 101 to form a volume increasing space portion 103 for increasing a volume of oil to be charged.
- the volume increasing space portion 103 contains charged oil and air like in other areas inside the rotary case 3 .
- the volume increasing space portion 103 is in communication with the main clutch 7 via the space 51 between the inner shaft 5 and the cylindrical member 19 and the ball bearing 33 , or via four pieces of radial flow passages 105 formed in the inner shaft 5 .
- the inner plates 57 of the main clutch 7 are formed with oil apertures 107 , respectively, which promote the movement of oil toward the ball cam 9 , the pilot clutch 11 and the bearing 65 which are consequently lubricated and cooled at an increased efficiently.
- the pressure plate 61 is formed with a through bore 109 .
- the through bore 109 eliminates a moving resistance of the pressure plate 61 due to the oil to improve an operation response of the main clutch 7 while serving as a flow passage of oil to promote the flow of oil into the ball cam 9 and the pilot clutch 11 which are consequently lubricated and cooled at an improved efficiency.
- the housing 14 is comprised of a front housing 111 and a rear housing 113 which are made of iron alloy, respectively, with the front and rear housings 111 , 113 being positioned with respect to one another by means of a stud pin 115 and fixedly secured to one another by means of bolts. Also, the housing 14 may be formed of material made of aluminum alloy.
- the electromagnetic coupling 1 is protected with the housing 14 from being impinged upon foreign material such as stones flying during the travel or stepped portions and convex portions appearing during the travel.
- seal member 17 is disposed between the dust cover 15 and a fore end 111 a (on the stationary member at a position opposed to the dust cover) of the front housing 111 .
- a seal member 141 disposed between the rear housing 113 and the rotor 21 .
- the seal member 17 and the seal member 141 serve to prevent foreign material such as dusts and moisture from entering the gap between the housing 14 and the rotary case 3 .
- FIG. 3 is an enlarged cross sectional view illustrating an essential part of the seal structure of the embodiment according to the present invention for use in the electromagnetic coupling shown in FIG. 2 .
- the seal member 17 is comprised of a retaining fixture (retaining member) 121 and a seal member 123 that is integrally formed with a plurality of (three pieces in the first embodiment) lips 125 , 127 , 129 .
- the retaining fixture 121 is press fitted to the fore end 111 a of the front housing 111 by means of a base portion 124 of the seal member 123 .
- a press fitted portion may be additionally applied with sealing material.
- the lips 127 , 129 are held in sliding contact with the dust cover 15 .
- the lip 127 is held in sliding contact with a thrust surface 150 extending from a dust cover 15 concentric with a rotational axis of the cylindrical member 19 , and an annular sliding portion is formed between the thrust surface 150 and the seal portion 123 .
- the lip 129 is held in sliding contact with a radial surface (side wall) 117 of the dust cover 15 concentric with the rotational axis of the cylindrical member 19 , and an annular sliding portion is formed between the radial surface 117 and the seal portion 123 .
- the presence of sliding contact between the lip portion 129 and the radial surface 117 of the dust cover 15 concentric with the rotational axis of the cylindrical member 19 provides an expelling action by which foreign material is discharged radially outward of the rotary shaft of the cylindrical member 19 to enable foreign material to be effectively prevented from entering the sliding portions of the seal member 17 .
- the seal member 123 (at the lips 127 , 129 ) are held in sliding contact with the dust cover 15 , which is made of iron alloy to have a high hardness, and there is no probability for the seal member 123 to slide on the cylindrical member 19 , which is made of aluminum alloy with a low hardness, the cylindrical member 19 is avoided from being abnormally worn due to the sliding contact with the lips 127 , 129 .
- the dust cover 15 is made of material (such as general structural pressing steel material) with a hardness (normally higher than 350 HV) that is higher than that of material (such as aluminum alloy) selected to form the cylindrical member 19 , it is possible for the dust cover 15 , while remained in sliding contact with the seal portion 123 , to have an improved anticorrosive and heat resistant property. Accordingly, a desired sealing property of the seal member is favorably extended for a prolonged time period.
- conducting rustproof coating treatment onto the dust cover 15 provides a capability for further improving the anticorrosive property.
- the dust cover 15 made of the selected material set forth above, may be entirely or partly subjected to surface hardening treatment, such as tempering/hardening or carbonizing to obtain a further increased hardness.
- the material (such as general structural pressing steel material) selected for the dust cover 15 has a smaller thermal expansion rate than that of the material (such as aluminum alloy) selected for the cylindrical member 19 , the presence of sliding contact between the seal member 17 and the dust cover 15 enables dimensional change, caused by the coefficient of expansion of the dust cover 15 , in a drawing margin at the sliding portion in terms of the temperature rise of the cylindrical member 19 . Consequently, a favorable sealing property is maintained for a prolonged time period.
- the dust cover 15 has an axially extending overlapping portion 119 , which is radially displaced from the fore end 111 a of the housing 111 with a given distance, and is axially opened.
- the overlapping portion 119 is opened axially inward along the rotational axis of the cylindrical member 19 .
- the dust cover 15 is opened in a direction opposite to that in which the foreign material enters, resulting in a further increased effect for limiting the entry of the foreign material.
- an opening portion of the housing 111 has a radially inwardly bent portion 140 .
- the bent portion 140 is held in abutting engagement with one end of an outer race 160 of the bearing 25 and, therefore, the bearing 25 is positioned at the one side of the rotational axis of the cylindrical member 19 .
- a washer 200 is interposed between a nut 210 of the stud bolt 31 and a front distal end surface (fore end 19 a ) of the cylindrical member 19 to preclude the dust cover 15 from missing from the cylindrical member 19 .
- the dust cover 15 is also positioned to the one side of the rotational axis of the cylindrical member 19 .
- the presence of the cylindrical member 19 comprised of the case-like torque transmitting member made of aluminum alloy enables the cylindrical member 19 to be formed in a light weight while enabling reduction in moment of inertia of the rotary member, with a resultant decrease in load of the prime mover.
- the rotary member 19 that is the rotary side member free from sliding contact with the seal member 123 , may be made of, in addition to light metal such as aluminum alloy, other material such as plastic resin provided that a desired strength is obtained.
- cylindrical member 19 (case-like torque transmitting member) is supported with the front housing 111 by means of the bearing at the position close proximity to the seal member 17 and axially inward of the rotational axis of the rotary member 19 .
- a general-purpose seal member can be selected for preference to form the seal member 17 .
- a plurality of stud bolts 31 are located on the front distal end (fore end 19 a ) of the cylindrical member (case-like torque transmitting member) 19 at circumferentially spaced positions along the rotational axis of the cylindrical member 19 , with the seal member 17 being disposed in an area of the cylindrical member 19 at a position radially outward of the stud bolts 31 .
- the washer 200 is intended to prevent the dust cover 15 from missing from the cylindrical member 19 toward a radially outward area of the rotational axis of the cylindrical member 19
- a companion flange (see FIG. 8 ) or a joint fork (see FIG. 8 ) integrally formed with the companion flange may serve as means for preventing the dust cover 15 from missing from the cylindrical member 19 .
- the inner shaft 5 (shaft-like torque transmitting member) is disposed in an inner periphery of the cylindrical member (case-like torque transmitting member) 19 , with the main clutch 7 being interposed between these power transmitting members.
- the seal structure of the present invention has a favorable sealing property for a prolonged time period even when applied to a device in which the main clutch 7 , whose operating temperature is anticipated to rise, is mounted for connecting or disconnecting the drive power output.
- the electromagnet 13 disposed in axially close proximity to the pilot clutch 11 , produces a magnetic field for the pilot clutch 11 to attract the same for thereby uncoupling the pilot clutch 11
- the cylindrical member (case-like torque transmitting member) 19 it is possible for the cylindrical member (case-like torque transmitting member) 19 to be made of material to limit the generation of the magnetic field of the electromagnet 13 .
- the cylindrical member (case-like torque transmitting member) 19 of the electromagnet clutches 7 , 11 which are coupled or uncoupled with the electromagnet 13 , is made of non-magnetic material such as aluminum alloy or austenite stainless steel to avoid the leakage of the magnetic flux and, in an on-vehicle device, attempts have been made to decrease a loss in a battery, which serves as a power supply of the electromagnet, to improve fuel consumption of the prime mover, the presence of the dust cover, mounted to the case-like torque transmitting member in a manner as set forth above, provides a capability of avoiding the sliding contact between the case-like torque transmitting member and the seal member and, so, the present invention is particularly advantageous in such a structure employing the electromagnet clutch.
- the seal member 17 is fixed to the fore end 111 a of the front housing 111 , and the front housing 111 has the radially inwardly extending bent portion 140 formed at the opening of the front housing 111 such that a distance (r S2 ) between a center C of axis of the cylindrical member 19 and a fixed surface of the seal member 17 is smaller than a distance (r B2 ) (i.e., r S2 ⁇ r B2 ) between the center c of axis and an outer diametrical surface of the bearing 25 .
- Such a configuration also provides an improved assembling performance of the seal member 17 and the bearing 25 .
- the presence of the bent portion 140 allows the bearing 25 to be positioned at one side of the rotational axis of the cylindrical member 19 .
- the seal member 17 has a sliding radius (r s1 ) of curvature smaller than that of the rotational radius (r B1 ) of curvature of the bearing 25 (i.e., r S1 ⁇ r B1 ).
- Such a particular configuration enables a sliding speed to be reduced, resulting in a further improved sealing property.
- This may be similarly applied to the sliding surface of at least one of the sliding portions in the structure of the subsequent embodiments.
- the front housing 111 is the cover that is mounted to a distal end of the differential carrier 314 and the cylindrical member (case-like torque transmitting member) 19 has the front distal end exposed to the opening portion formed at the end of the front housing 111 to permit the drive power output to be connected to one of the input shaft and output shaft.
- the inner shaft (shaft-like torque transmitting member) 5 disposed in the inner peripheral side of the cylindrical member (case-like torque transmitting member) 19 is connected to one drive shaft of the input shaft and the output shaft via the clutches 7 , 11 which are coupled or uncoupled.
- seal structure embodying the present invention in such a drive power transmitting device mentioned above enables the device per se and associated structures to be formed in a compact configuration with a minimum layout space.
- the seal member 141 is comprised of a retaining fixture 135 and a seal portion 133 which are integrally formed with one another.
- the retaining fixture 135 is press fitted to an inner periphery of the rear housing 113 , with the seal portion 133 being held in sliding contact with the outer periphery of the rotor 21 . Since the rotor 21 is made of iron alloy to have a high hardness, there is less probability of wear due to the sliding contact with the seal portion 133 to have an extended durability.
- the dish spring 137 and the washer 139 disposed between the core 29 of the electromagnet 13 and the rear housing 113 , with the dish spring 137 exerting an urging force to the rotary case 3 and the inner shaft 5 which are consequently pressed forward to eliminate an axial clearance between the electromagnetic coupling 1 and the housing 14 .
- a plurality of cooling fins 139 which cools the space inside the housing 14 and the electromagnetic coupling 1 located in such a space.
- the electromagnetic coupling 1 concerns the presence of the seal portion 123 (lips 127 , 129 ) of the seal 17 held in sliding contact with the dust cover 15 made of iron alloy and having the high hardness whereby the cylindrical member 19 is avoided from sliding on the seal portion 123 to preclude the cylindrical portion 19 from being worn due to the sliding contact.
- the cylindrical member 19 it becomes possible for the cylindrical member 19 to be made of aluminum alloy, resulting in the electromagnetic coupling 1 with a remarkable light weight.
- the presence of the light weight of the electromagnetic coupling 1 renders the electromagnetic coupling 1 to have a minimized inertia of momentum with less unbalance in rotation and less vibration due to such unbalanced rotation while minimizing the fuel consumption of the engine.
- the utilization of the wear-resistant property of the dust cover 15 provides no need for a component specific for sealing, such as a collar, to improve the wear-resistance property to be additionally and newly prepared, avoiding an increase in the number of component parts and their costs, management costs of the component parts and working costs for assembly.
- the seal structure since the seal member 17 is disposed between the dust cover 15 and the front housing 111 (stationary member) (i.e., the dust cover 15 ad the seal member 17 are located in the same location), the seal structure has a narrower layout space than that of the related art coupling in which the seal and the dust cover are disposed in separate locations, resulting in a simplified structure of the electromagnetic coupling 1 involving the dust cover 15 .
- the presence of the cylindrical member 19 made of aluminum alloy (non-magnetic material) precludes the magnetic flux from being leaked for eliminating loss in the battery serving as the power supply of the electromagnet 13 , resulting in a further reduction in the fuel consumption of the engine.
- the present invention which enables the cylindrical member 19 to be made of the non-magnetic material, is particularly advantageous in a rotary member such as the electromagnetic coupling 1 that causes the clutch to be intermittently coupled or uncoupled with the electromagnet.
- the cylindrical member 19 may be made of austenite stainless steel with a relatively low hardness and, further, if a sufficient strength is obtained, the cylindrical member 19 may be made of plastic resin.
- the main clutch 7 functions as a mechanism to transmit the drive power output between the case-like torque transmitting member (rotary case 3 ) and the axial torque transmitting member (inner shaft 5 ).
- the outer plates 53 and the inner plates 57 has no meaning, and in addition to the respective plates 53 , 57 , the rotary case 3 and the inner shaft 5 similarly constitute essential components of the main clutch 7 .
- the pilot clutch 11 is comprised of the rotary case 3 , the cam ring 63 , the outer plates 69 and the inner plates 71 all of which serve as essential components.
- the ball cam 9 includes a cam mechanism, for converting the resulting drive torque into the urging force, which is comprised of not only the pressure plate 61 , the cam ring 63 , the cam surface formed thereon and a plurality of balls disposed between adjacent components, but also the inner shaft 5 to transmit the drive power output to the pressure plate 61 , the rotary case 3 for transmitting the drive power output to the cam ring 63 , and the pilot clutch 11 , all of which form essential components.
- a cam mechanism for converting the resulting drive torque into the urging force, which is comprised of not only the pressure plate 61 , the cam ring 63 , the cam surface formed thereon and a plurality of balls disposed between adjacent components, but also the inner shaft 5 to transmit the drive power output to the pressure plate 61 , the rotary case 3 for transmitting the drive power output to the cam ring 63 , and the pilot clutch 11 , all of which form essential components.
- main clutch 7 and the pilot clutch 11 may include clutches of any types involving, in addition to the multiple plate type clutches, frictional clutches, such as single plate clutches and cone type clutches. Also, these clutches may of wet types or dry types.
- the present invention is not limited to a particular structure shown in the presently filed embodiment in which the electromagnet clutch is structured with the pilot clutch and the cam mechanism to couple the main clutch, and may take the form of a structure wherein the main clutch is directly urged with an armature adapted to be moveably operated with an electromagnet or a spring.
- seal structure of the present invention may be widely applied to rotational members and may be applied to not only the coupling adapted to be coupled or uncoupled by means of the clutch as in the presently filed embodiment but also a coupling such as one of the related art which is operative to transmits torque by means of shearing resistance of a viscous fluid without coupling or uncoupling operations.
- FIG. 4 is an enlarged cross sectional view illustrating an essential part of a seal structure of a second embodiment according to the present invention.
- This embodiment is a modified form of the first embodiment and has the same structure as that of the first embodiment except in that a sliding area between a duct cover 15 b and a seal member 17 b is located in close proximity to the front housing 111 . Accordingly, like parts bear like reference numerals as those used in the first embodiment to omit description of the same parts.
- the seal member 17 b is comprised of a retaining fixture (support member) 121 b and a seal portion 123 b which are integrally formed, with the seal portion 123 b being formed with three pieces of lips 125 b, 127 b, 129 b.
- the retaining fixture 121 b is press fitted to an outer periphery of the fore end 19 a of the cylindrical member 19 via a base portion 124 b of the seal portion 123 b.
- a press fitted area may be additionally applied with sealing material.
- the lips 125 b, 127 b, 129 b are held in sliding contact with the dust cover 15 b.
- the lips 125 b, 127 b are held in contact with a thrust surface 150 b of the nose 111 a of the front housing 111 concentric with the rotational axis of the cylindrical member 19 , with an annular sliding portion being defined between the thrust surface 150 b and the seal portion 123 b.
- the lip 129 b is held in contact with a radial surface (side wall) 117 b of the dust cover 15 b concentric with the rotational axis of the cylindrical member 19 , with an annular sliding portion being formed between the thrust surface 117 b and the seal portion 123 b.
- the dust cover 15 b has an overlapping portion 119 b which is axially opened with a given space defined relative to the outer periphery of the fore end 19 a of the cylindrical member 19 and, in the second embodiment, the overlapping portion 119 b is opened outward with respect to the rotational axis of the cylindrical member 19 .
- seal structure of the second embodiment also has the same advantage as that of the first embodiment.
- FIG. 5 is an enlarged cross sectional view illustrating an essential part of a seal structure of a third embodiment according to the present invention.
- This embodiment has the same structure as that of the first embodiment except in that a seal member 17 c is also held in sliding contact with the cylindrical member 19 via a sliding surface 150 c of a hard sleeve member 155 c made of hard material. Accordingly, like parts bear like reference numerals as those used in the first embodiment to omit description of the same parts.
- the seal member 17 c is comprised of a retaining fixture (support member) 121 c and a seal portion 123 c which are integrally formed, with the seal portion 123 c being formed with two pieces of lips 125 c, 127 c.
- the retaining fixture 121 c is press fitted to an inner periphery of the fore end 111 a of the front housing 111 via a base portion 124 c of the seal portion 123 c.
- a press fitted area may be additionally applied with sealing material.
- the lips 125 c, 127 c are held in sliding contact with the hard member 155 c.
- the lips 125 c, 127 c are held in sliding contact with a sliding surface 150 c of the hard member 155 c concentric with the cylindrical member 19 , with an annular sliding portion being formed between the sliding surface 150 c and the seal portion 123 c.
- the presently filed embodiment has an advantage, in addition to the advantages achieved by the first embodiment, in that, in a case where material (aluminum alloy, stainless, brass or carbon) is selected for the cylindrical member (case-like member) 19 for the purpose of forming the cylindrical member 19 in a light weight and using non-magnetic material, the presence of the sliding portion formed between the fore end 19 a of the cylindrical member 19 and the hard member 155 c provides a capability for the seal member 17 c to have a sealing capability and sliding characteristic maintained under a favorable condition for a prolonged time period.
- material aluminum alloy, stainless, brass or carbon
- FIG. 6 is an enlarged cross sectional view illustrating an essential part of a seal structure of a fourth embodiment according to the present invention.
- This embodiment is a modified form of the third embodiment and has the same structure as that of the third embodiment except in that a hard sleeve member 155 d is disposed in the front housing 111 . Accordingly, like parts bear like reference numerals as those used in the third embodiment to omit description of the same parts.
- the seal member 17 d is comprised of a retaining fixture (support member) 121 d and a seal portion 123 d which are integrally formed with one another, with the seal portion 123 d being formed with three pieces of lips 125 d, 127 d, 129 d.
- the retaining fixture 121 d is press fitted to an outer periphery of the fore end 19 a of the cylindrical member 19 via a base portion 124 d of the seal portion 123 d.
- a press fitted area may be additionally applied with sealing material.
- the lips 125 d, 127 d are held in sliding contact with the sleeve 155 d.
- the lips 125 d, 127 d are held in sliding contact with the fore end 111 a of the front housing 111 via the hard member 155 d.
- the lips 125 d, 127 d are held in contact with a thrust surface 150 d of the hard member 155 d concentric with the rotational axis of the cylindrical member 19 , with an annular sliding portion being formed between the thrust surface 150 d and the seal portion 123 d.
- the lip 129 d is held in contact with a radial surface (side wall) 117 d of the dust cover 15 d concentric with the rotational axis of the cylindrical member 19 , with an annular sliding portion being formed between the radial surface 117 d and the seal portion 123 d.
- the dust cover 15 d has an overlapping portion 119 d which is axially opened with a given space defined relative to the outer periphery of the fore end 19 a of the cylindrical member 19 and, in the third embodiment, the overlapping portion 119 d is opened axially outward with respect to the rotational axis of the cylindrical member 19 .
- seal structure of the fourth embodiment also has the same advantage as that of the third embodiment.
- FIG. 7 is an enlarged cross sectional view illustrating an essential part of a seal structure of a fifth embodiment according to the present invention.
- This embodiment has the same structure as that of the third embodiment except in that a sliding portion is formed between a treated surface 200 and a seal member 17 e. Accordingly, like parts bear like reference numerals as those used in the third embodiment to omit description of the same parts.
- the seal member 17 e is comprised of a retaining fixture (support member) 121 e and a seal portion 123 e which are integrally formed with one another, with the seal portion 123 e being formed with two pieces of lips 125 e, 127 e.
- the lips 125 e, 127 e are held in sliding contact with a thrust surface (treated surface) 200 a, which is subjected to surface hardening treatment, of the fore end 19 a of the cylindrical member 19 , with an annular sliding portion being formed between the thrust surface 200 a and the seal portion 123 e.
- a thrust surface (treated surface) 200 a which is subjected to surface hardening treatment, of the fore end 19 a of the cylindrical member 19 , with an annular sliding portion being formed between the thrust surface 200 a and the seal portion 123 e.
- the retaining fixture 121 f is press fitted to the nose 111 a of the front housing 111 via a base portion 124 f of the seal portion 123 f.
- a press fitted area may be additionally applied with sealing material.
- the dust cover 15 f is secured to the centering portion 170 a of the joint fork 170 f formed with the companion flange 180 as the coupling. And, the lips 125 f, 127 f are held in sliding contact with the dust cover 15 f.
- the lips 125 f, 127 f are held in sliding contact with a thrust surface (treated surface) 150 f of the dust cover 15 f concentric with the rotational axis of the cylindrical member 19 , with an annular sliding portion being formed between the thrust surface 150 f and the seal portion 123 f.
- a thrust surface (treated surface) 150 f of the dust cover 15 f concentric with the rotational axis of the cylindrical member 19 , with an annular sliding portion being formed between the thrust surface 150 f and the seal portion 123 f.
- the cylindrical member (case-like torque transmitting member) 19 is structured with the inner shaft 5 and the joint fork (integrally formed with the companion flange 180 as the coupling) 170 f which is unitarily connected to the inner shaft 5 . And, the dust cover 15 f is secured to the centering portion 170 a of the joint fork 170 f.
- the retaining fixture 121 g is press fitted to the nose 111 a of the front housing 111 via a base portion 124 g of the seal portion 123 g.
- a press fitted area may be additionally applied with sealing material.
- the dust cover 15 g is secured to the centering portion 170 a ′ of the joint fork 170 g formed with the companion flange 180 as the coupling. And, the lips 125 g, 127 g are held in sliding contact with the dust cover 15 g.
- the joint fork 170 g is formed with a stepped portion 170 c ′ to allow the dust cover 15 g to be positioned to one side of the rotational axis and prevented from axially missing outward with respect to the rotational axis.
Abstract
A seal structure is disclosed as mounted in a coupling 1, exposed in the vicinity of a stationary member 14, with a dust cover 15 being mounted to a cylindrical member 19 for preventing foreign material from entering a gap between the coupling 1 and the stationary member 14, and a seal member 17 is disposed at a position opposed to the dust cover on the stationary member 14, with a seal portion 123 of the seal 17 being held in sliding contact with the dust cover 15.
Description
- This application is a division of application Ser. No. 10/254,400 filed on Sep. 25, 2002, the entire contents of which are incorporated herein by reference.
- The present invention relates to a seal structure for relatively rotational members to be employed between a rotary member, such as a coupling exposed to and connected to a propeller shaft of a four-wheel drive vehicle, and a stationary member that retains the rotary member to a vehicle body.
- In general, attempts have heretofore been made to propose structures as disclosed in Japanese Patent Application Laid-open No. 1-182633 and 10-292827 wherein a coupling (rotary member) is exposed to and connected to a propeller shaft of a four-wheel drive vehicle and wherein a rotary member is exposed outside and located in the vicinity of a stationary member. With the structure wherein the rotary member is exposed outside and located, as shown in Japanese Patent Application Laid-open No. 10-292827, an attempt has been made to dispose a seal structure, such as a dust cover or seal members, between the rotary member and the stationary member to prevent foreign material from entering a relatively rotational region between the stationary member and the rotary member.
- However, with the coupling (rotary member) disposed on the propeller shaft of the four-wheel drive vehicle in a way as proposed in the related art structure, there are requirements for a housing, that is the rotary member, to be made of aluminum alloy (light metal) because of needs for the rotary member to be light weighted to lower a momentum of inertia.
- But, in a case where the housing, that forms the rotary member, is made of aluminum alloy (light metal), the aluminum alloy has a low hardness to cause a sliding portion between the seal member and the housing to be easily worn, resulting in an issue of an inability of easily determining the sliding portion.
- Further, while another proposal has been made in the past to provide the dust cover to improve an effectiveness for preventing entry of foreign material, it has been a usual practice to have the dust cover and the seal member to be located at separate positions to need separate mounting spaces, causing a difficulty in structuring an entire structure of the coupling in a compact configuration.
- It is, therefore, an object of the present invention to provide a seal structure which is disposed between a rotary member, which is located to be exposed outside, and a stationary member, and which has an increased sealing performance. It is another object of the present invention to provide a seal structure which enables the rotary member to be made of light material without increasing the number of component parts. It is another object of the present invention to provide a seal structure which is capable of miniaturizing a device involving the seal structure. It is a further object of the present invention to provide a seal structure which is capable of decreasing costs of a device involving the seal structure. It is a further object of the present invention to provide a seal structure which, when installed in a vehicle, enables fuel consumption to be improved.
- According to a first aspect of the present invention, there is provided a seal structure for sealing a gap between a first member and a second member disposed to be rotational relative to the first member, the seal structure comprising: a cover member preventing foreign material from entering the gap; and a seal member fixedly secured to at least one of the first and second members and held in sliding contact with the cover member to seal the gap.
- With the seal structure according to the first aspect of the present invention, arranging the seal member to be held in sliding contact with the dust cover (cover) mounted to a rotary component (second member) of the rotary member prevents the rotary component from directly sliding with the seal member.
- Accordingly, even in case of the rotary component being made of light metal such as aluminum alloy, no probability occurs for the rotary component to be worn due to sliding with the seal member and, therefore, the rotary member can be made of light metal to cause the rotary member to be light weighted to lower a momentum of inertia for thereby enabling a fuel consumption (drive power consumption) of an engine (prime mover) to be improved.
- Further, using the dust cover as a member with which the seal member slides enables the seal structure to be obtained, which is more simplified in structure than the related art seal structure (with no need for a specific consideration in design to form the sliding portion on the rotational member) while enabling reduction in the number of component parts.
- Furthermore, since the seal member is disposed between the dust cover and the stationary member (at the same area in which both the dust cover and the seal member are located), the seal structure is suffice to have a narrower mounting space than that of the structure in which the seal member and the dust cover are separately located, resulting in a compact structure and light weight of the entire structure of the rotary member involving the dust cover.
- With the seal structure set forth above, moreover, the freedom of selecting material of the rotary member is increased and, therefore, it is possible for the rotary member, which is made free from sliding the seal member, to be made of, in addition to light metal such as aluminum alloy, other material such as plastic resin provided that a desired strength is obtained.
- From the foregoing description, it will be appreciated that remarkable reduction is achieved in costs such as part costs, management costs for component parts and assembling costs.
- A second aspect of the present invention concerns a seal structure for sealing a gap between a first member and a second member disposed to be rotational relative to the first member, the seal structure comprising: a seal member disposed between the first member and the case-like torque transmitting member; wherein the second member includes a case-like torque transmitting member; wherein the case-like torque transmitting member is supported with the first member via a bearing at a position in the vicinity of the seal member within an area axially inward of the first member along a rotational axis of the case-like torque transmitting member; and wherein the seal member has a sliding radius of curvature smaller than a rotating radius of curvature of the bearing.
- With such a structure, selection of bearings is made possible with a priority given to a supporting function for the case-like torque transmitting member. That is, there is no need for employing specified bearings involving a sealing function and, consequently, a designer becomes free from restriction in design and layout space, resulting in a remarkable reduction in costs.
- Thus, it becomes reasonable for the seal member to be selected from general-purpose seal members for preference.
- Further, selecting the sliding radius of curvature of the seal member to be in a small value enables a peripheral speed to be decreased with a resultant further improvement in the sealing capability.
-
FIG. 1 is a skeleton structural view illustrating a power transmission system of a vehicle installed with an electromagnetic coupling employing a seal structure of a first embodiment according to the present invention. -
FIG. 2 is a cross sectional view illustrating the electromagnetic coupling employing at the seal structure of the first embodiment according to the present invention. -
FIG. 3 is a cross sectional view illustrating an essential part of the seal structure of the first embodiment shown inFIG. 1 . -
FIG. 4 is a cross sectional view illustrating an essential part of a seal structure of a second embodiment according to the present invention. -
FIG. 5 is a cross sectional view illustrating an essential part of a seal structure of a third embodiment according to the present invention. -
FIG. 6 is a cross sectional view illustrating an essential part of a seal structure of a fourth embodiment according to the present invention. -
FIG. 7 is a cross sectional view illustrating an essential part of a seal structure of a fifth embodiment according to the present invention. -
FIG. 8 is a cross sectional view illustrating an essential part of a seal structure of a sixth embodiment according to the present invention. -
FIG. 9 is a cross sectional view illustrating an essential part of a seal structure of a seventh embodiment according to the present invention. - A seal structure of an embodiment according to the present invention is described below with reference to
FIGS. 1 and 9 . -
FIG. 1 is a skeleton structural view illustrating a vehicle power transmission system incorporating an electromagnetic coupling that employs the seal structure of the embodiment according to the present invention. The vehicle power transmission system shown inFIG. 1 is shown as including a transversely installed engine (prime mover) 300, apower transmission 301, atransfer unit 303, a directional change-overgear mechanism 304 disposed inside thetransfer unit 303, a front differential gear (differential unit for distributing a drive power output of the engine to right and left wheels) 305, right and leftfront wheels propeller shaft 308, anelectromagnetic coupling 1, adrive pinion gear 309, a reardifferential gear 310, aring gear 311, right and leftrear wheels differential carrier 314. - The drive power output of the
engine 301 is transmitted to a differential case of the frontdifferential unit 305 from an output gear of thepower transmission 301, from which the drive power output is distributed over the right and leftfront wheels - Further, as the directional change-over
gear mechanism 304 is coupled, rotation of the differential case is transmitted via thetransfer unit 303 to thepropeller shaft 308 through which the drive power output is further transferred to theelectromagnetic coupling 1. - As the
electromagnetic coupling 1 is coupled, the drive power output of theengine 301 is transmitted through thepropeller shaft 308 and adrive pinion 309 to the reardifferential unit 310, from which the drive power output is further distributed via the reardifferential unit 310 to the right and leftrear wheels - Furthermore, if the
electromagnetic coupling 1 is uncoupled, the component parts subsequent to thepropeller shaft 308 are disconnected to render the vehicle to be operative in a two-wheel drive mode. - Thus, the
electromagnetic coupling 1 serves as a clutch structure that is located in a rear power transmission line, closer to therear wheels rear wheels rear wheels propeller shaft 308 is shown in a simplified form inFIG. 1 , in actual practice, the propeller shaft, that forms a part of the rear power transmission line, is connected through a joint portion to theelectromagnetic coupling 1 which in turn is connected to aring gear 313 of the reardifferential gear 310 via adrive pinion gear 309 in meshing engagement. In this respect, it is to be noted that a left side of a structure shown inFIG. 2 corresponds to a front side (engine side) of such a vehicle. - The
electromagnetic coupling 1 has a bearing 25 and the seal structure of the present invention provided in a front direction of the vehicle. -
FIG. 2 is a cross sectional representation of the electromagnetic coupling incorporating the seal structure of the embodiment according to the present invention. - The
electromagnetic coupling 1 is shown as including a rotary case 3 (case-like torque transmitting member), an inner shaft 5 (shaft-like torque transmitting member), a multi-plate typemain clutch 7, aball cam 9, apilot clutch 11, anelectromagnet 13, a housing 14 (stationary member), adust cover 15, a seal (seal member) 17, and a controller. - The
housing 14 is supported on a vehicle body by means of a support fixture, fixedly attached to a floor panel of the vehicle and a flexible support member. - The
rotary case 3 is comprised of a cylindrical member 19 (case-like torque transmitting member) formed with a bottom wall and made of aluminum alloy (non-magnetic material), and arotor 21, made of iron alloy (magnetic material), such as low carbon steel material, which is located at a rear side. - The
rotor 21 is screwed into a rearward opening portion of thecylindrical member 19 and is fixedly secured thereto by means of a locked nut function of anut 23. - A front end of the
cylindrical member 19 is supported with thehousing 14 via the ball bearing 25 of a type sealed on both sides, and therotor 21 is supported with thehousing 14 via a ball bearing 27 of a type sealed on both sides and acore 29 of theelectromagnet 13. - A companion flange is fixed to the front end of the
cylindrical member 19 by means of astud bolt 31, with the companion flange being integrally formed with a joint fork of a coupling. - The
cylindrical member 19 is connected via this coupling to the transfer side propeller shaft to allow the drive power output of the engine to be transmitted through these power transmitting components to thecylindrical member 19 of therotary case 3. - The
inner shaft 5 is inserted through thecylindrical member 19 of therotary case 3 from the rear side thereof, with a fore end of theinner shaft 5 being rotationally supported with thecylindrical member 19 via abearing 33 while an aft end of theinner shaft 5 is supported with therotor 21 via a needle bearing 35. Further, theinner shaft 5 is axially positioned with respect to therotary case 3 by means ofsnap rings - Coupled to the
inner shaft 5 via a splined connection is a connecting shaft 41 (fore end of the drive pinion gear 309). - The connecting
shaft 41 is connected via adrive pinion gear 309 to aring gear 311, in meshing engagement therewith, of a reardifferential unit 310 to rotationally drive the same. - An O-
ring 43 is disposed between thecylindrical member 19 of therotary case 3 and therotor 21. Also, an X-ring 45, that is a seal with an X-shape in cross section, is disposed inwardly of the needle bearing 35 between therotor 21 and theinner shaft 5. Thus, the electromagnetic coupling 1 (rotary case 3) is tightly sealed with the O-ring 43 and the X-ring 45. - The tightly sealed
rotary case 3 is filled with oil through an oil bore 47 formed in thecylindrical member 19, with the oil bore 47 being sealed with acheck ball 49 tightly fitted thereto after the oil has been charged. Further, thecylindrical member 19 is internally formed with aspace 51, that serves as an oil flow passage, at a position associated with the oil bore 47. - The
main clutch 7 is disposed between therotary case 3 and theinner shaft 5, withouter plates 53 of themain clutch 7 being coupled to asplined portion 55 internally formed in the rotary case 3 (cylindrical member 19) whileinner plates 57 of themain clutch 7 are coupled to asplined portion 59 formed on an outer periphery of theinner shaft 5. - The
ball cam 9 is disposed between apressure plate 61 and acam ring 63. - The
pressure plate 61 has an inner periphery coupled to thesplined portion 59 of theinner shaft 5 to urge themain clutch 7 toward therotary case 3 by the action of a cam thrust force exerted by theball cam 9 to be brought into a coupled condition. - The
cam ring 63 is disposed on an outer periphery of theinner shaft 5 for relatively rotational movement, and disposed between thecam ring 63 and therotor 21 are athrust bearing 65 and awasher 67 which bear a cam reaction force exerted by theball cam 9. - The
pilot clutch 11 is disposed between thecylindrical member 19 of therotary case 3 and thecam ring 63, withouter plates 69 of thepilot clutch 11 being coupled to thesplined portion 55 of thecylindrical member 19 while inner plates 71 of thepilot clutch 11 are coupled to a splined portion 73 formed on an outer periphery of thecam ring 63. - Disposed between the
pilot clutch 11 and thepressure plate 61 is anarmature 75, whose outer periphery is coupled to thesplined portion 5 of therotary case 3 for freely axial movements. - A
core 29 of theelectromagnet 13 is press fitted to acylindrical bore 77 formed in thehousing 14, which supports therotor 21 via the ball bearing 27 as set forth above. Further, thecore 29 is inserted into a concave portion 79, formed in the rotor 27, with an appropriate air gap and is axially positioned with respect to therotor 21 by means of snap rings 81, 83 and the ball bearing 27. - Further, a retaining
member 87 engages arecess 85 formed in thecore 29 and also engages anengagement portion 89 formed in the cylindrical bore 77 of thehousing 14 to hold the electromagnet 13 (core 29) for a non-rotary capability. - A
lead wire 91 of theelectromagnet 13 is clipped with the retainingmember 87 and extends through agrommet 93 outside thehousing 14 to be connected to a battery installed on the vehicle. - The
rotor 21, thepilot clutch 11 and thearmature 75 form a magnetic flux path of theelectromagnet 13. - The
rotor 21 is divided into radially outer and inner halves with a ring 95 made of austenite stainless steel. Also, each of theplates 69, 71 of thepilot clutch 11 is formed with circumferentially spaced cutouts 97 at a radial position corresponding to the ring 95 and associated bridge portions interconnecting these cutouts 97 with one another. The ring 95 and the cutouts 97 avoid the magnetic flux from being shorted on the magnetic flux path. - The controller performs excitation of the
electromagnet 13, control of an excitation current and interruption of excitation. - As the
electromagnet 13 is excited, amagnetic flux loop 99 is established in the magnetic flux path to attract thearmature 75, causing thepilot clutch 11 to be urged into the coupled condition to produce a pilot torque. - When the pilot torque is produced, the
ball cam 9 is exerted with a thrust force from therotary case 3 via thepilot clutch 11 and thecam ring 63 at a level depending on the magnitude of the pilot torque, thereby causing themain clutch 7 to be urged and coupled via thepressure plate 61 to allow theelectromagnetic coupling 1 to be brought into a coupled condition. - Also, as set forth above, since the
cylindrical member 19 of therotary case 3 is made of aluminum alloy of the non-magnetic material to preclude the magnetic flux from being leaking from themagnetic flux path 99 to thecylindrical member 19 to allow the magnetic flux to be efficiently directed to thearmature 75, thepilot clutch 11 is enabled to obtain a given pilot torque such that theelectromagnetic coupling 1 obtains a given magnitude of coupling torque. - As the
electromagnetic coupling 1 is coupled, the drive power output of the engine is transmitted from theinner shaft 5 to the rear differential unit via the rear-differential side propeller shaft whereupon the drive power output is distributed with the rear differential unit to the right and left rear wheels to allow the vehicle to be brought into the four-wheel drive condition, resulting in an improved rough road covering property and stability of the vehicle body. - During such operation, if the excitation current of the
electromagnet 13 is regulated with the controller to control the density of the magnetic flux, the slip rate of thepilot clutch 11 is varied to change the pilot torque and, therefore, it is possible for the coupling force (the magnitude of the drive power output to be transmitted to the rear wheels via the electromagnetic coupling 1) of themain clutch 7 to be adjusted. - With such an adjustment of the coupling force, the distribution ratio of the drive power output between the front and rear wheels can be arbitrarily controlled such that, when implementing such a control during a turning travel, an improved drivability and stability of the vehicle can be obtained.
- Further, when interrupting the excitation of the
electromagnet 13, thepilot clutch 11 is uncoupled to cause the thrust force of theball cam 9 to be lost, with a resultant uncoupling of themain clutch 7 to cause theelectromagnetic coupling 1 to be brought into the uncoupled condition. - If the
electromagnetic coupling 1 is uncoupled, the rear-differential side propeller shaft and the rear wheels are disconnected from the front propeller shaft to allow the vehicle to be brought into the two-wheel drive condition for driving only the front wheels, resulting in an improved fuel consumption of the vehicle. - The hollow
inner shaft 5 is separated with awall portion 101 to form a volume increasingspace portion 103 for increasing a volume of oil to be charged. The volume increasingspace portion 103 contains charged oil and air like in other areas inside therotary case 3. - The volume increasing
space portion 103 is in communication with themain clutch 7 via thespace 51 between theinner shaft 5 and thecylindrical member 19 and theball bearing 33, or via four pieces ofradial flow passages 105 formed in theinner shaft 5. - When the electromagnetic coupling 1 (inner shaft 5) is rotated, the oil in the volume increasing
space portion 103 is caused to flow through thespace 51, theball bearing 33 and theradial flow passages 105 to lubricate and cools thebearing 33, themain clutch 7, theball cam 9, thepilot clutch 11, thebearing 65 and thewasher 67. - Further, since the
inner plates 57 of themain clutch 7 are formed withoil apertures 107, respectively, which promote the movement of oil toward theball cam 9, thepilot clutch 11 and thebearing 65 which are consequently lubricated and cooled at an increased efficiently. - Furthermore, the
pressure plate 61 is formed with a throughbore 109. The throughbore 109 eliminates a moving resistance of thepressure plate 61 due to the oil to improve an operation response of themain clutch 7 while serving as a flow passage of oil to promote the flow of oil into theball cam 9 and thepilot clutch 11 which are consequently lubricated and cooled at an improved efficiency. - The
housing 14 is comprised of afront housing 111 and arear housing 113 which are made of iron alloy, respectively, with the front andrear housings stud pin 115 and fixedly secured to one another by means of bolts. Also, thehousing 14 may be formed of material made of aluminum alloy. - The
electromagnetic coupling 1 is protected with thehousing 14 from being impinged upon foreign material such as stones flying during the travel or stepped portions and convex portions appearing during the travel. - The
dust cover 15 is made of iron alloy and press fitted to afore end 19 a of thecylindrical member 19. - Further, the
seal member 17 is disposed between thedust cover 15 and afore end 111 a (on the stationary member at a position opposed to the dust cover) of thefront housing 111. - Furthermore, formed between the
dust cover 15 and thefront housing - Moreover, disposed between the
rear housing 113 and therotor 21 is aseal member 141. - The
seal member 17 and theseal member 141 serve to prevent foreign material such as dusts and moisture from entering the gap between thehousing 14 and therotary case 3. - Accordingly, there is no probability for water and dusts from entering an air gap between the core 29 of the
electromagnet 13 and therotor 21 to prevent the rotor 21 (rotary case 3) from being locked due to biting of dusts, freezing of water and generation of rusts to maintain a function of theelectromagnetic coupling 1 in its normal condition. - Further, such a protective ability to prevent entry of water and dusts enables non-seal type ball bearings to be employed instead of the both-side
seal type bearings 25, 27, enabling manufacturing costs to be reduced to that extent. -
FIG. 3 is an enlarged cross sectional view illustrating an essential part of the seal structure of the embodiment according to the present invention for use in the electromagnetic coupling shown inFIG. 2 . - The
seal member 17 is comprised of a retaining fixture (retaining member) 121 and aseal member 123 that is integrally formed with a plurality of (three pieces in the first embodiment)lips - The retaining
fixture 121 is press fitted to thefore end 111 a of thefront housing 111 by means of abase portion 124 of theseal member 123. Such a press fitted portion may be additionally applied with sealing material. Also, thelips dust cover 15. In particular, thelip 127 is held in sliding contact with a thrust surface 150 extending from adust cover 15 concentric with a rotational axis of thecylindrical member 19, and an annular sliding portion is formed between the thrust surface 150 and theseal portion 123. Also, thelip 129 is held in sliding contact with a radial surface (side wall) 117 of thedust cover 15 concentric with the rotational axis of thecylindrical member 19, and an annular sliding portion is formed between theradial surface 117 and theseal portion 123. - Thus, the presence of sliding contact between the
lip portion 129 and theradial surface 117 of thedust cover 15 concentric with the rotational axis of thecylindrical member 19 provides an expelling action by which foreign material is discharged radially outward of the rotary shaft of thecylindrical member 19 to enable foreign material to be effectively prevented from entering the sliding portions of theseal member 17. - Further, since the seal member 123 (at the
lips 127,129) are held in sliding contact with thedust cover 15, which is made of iron alloy to have a high hardness, and there is no probability for theseal member 123 to slide on thecylindrical member 19, which is made of aluminum alloy with a low hardness, thecylindrical member 19 is avoided from being abnormally worn due to the sliding contact with thelips - Furthermore, since the
dust cover 15 is made of material (such as general structural pressing steel material) with a hardness (normally higher than 350 HV) that is higher than that of material (such as aluminum alloy) selected to form thecylindrical member 19, it is possible for thedust cover 15, while remained in sliding contact with theseal portion 123, to have an improved anticorrosive and heat resistant property. Accordingly, a desired sealing property of the seal member is favorably extended for a prolonged time period. - Moreover, conducting rustproof coating treatment onto the
dust cover 15 provides a capability for further improving the anticorrosive property. - Also, the
dust cover 15, made of the selected material set forth above, may be entirely or partly subjected to surface hardening treatment, such as tempering/hardening or carbonizing to obtain a further increased hardness. - In addition, even in a case where the material (such as general structural pressing steel material) selected for the
dust cover 15 has a smaller thermal expansion rate than that of the material (such as aluminum alloy) selected for thecylindrical member 19, the presence of sliding contact between theseal member 17 and thedust cover 15 enables dimensional change, caused by the coefficient of expansion of thedust cover 15, in a drawing margin at the sliding portion in terms of the temperature rise of thecylindrical member 19. Consequently, a favorable sealing property is maintained for a prolonged time period. - Further, the
dust cover 15 has an axially extending overlappingportion 119, which is radially displaced from thefore end 111 a of thehousing 111 with a given distance, and is axially opened. In the presently filed embodiment, the overlappingportion 119 is opened axially inward along the rotational axis of thecylindrical member 19. With such a particular configuration, thedust cover 15 is opened in a direction opposite to that in which the foreign material enters, resulting in a further increased effect for limiting the entry of the foreign material. - Furthermore, an opening portion of the
housing 111 has a radially inwardlybent portion 140. Thebent portion 140 is held in abutting engagement with one end of anouter race 160 of thebearing 25 and, therefore, thebearing 25 is positioned at the one side of the rotational axis of thecylindrical member 19. - Moreover, a
washer 200 is interposed between anut 210 of thestud bolt 31 and a front distal end surface (fore end 19 a) of thecylindrical member 19 to preclude thedust cover 15 from missing from thecylindrical member 19. Simultaneously, thedust cover 15 is also positioned to the one side of the rotational axis of thecylindrical member 19. - Also, the presence of the
cylindrical member 19 comprised of the case-like torque transmitting member made of aluminum alloy enables thecylindrical member 19 to be formed in a light weight while enabling reduction in moment of inertia of the rotary member, with a resultant decrease in load of the prime mover. - Further, the
rotary member 19, that is the rotary side member free from sliding contact with theseal member 123, may be made of, in addition to light metal such as aluminum alloy, other material such as plastic resin provided that a desired strength is obtained. - Furthermore, the cylindrical member 19 (case-like torque transmitting member) is supported with the
front housing 111 by means of the bearing at the position close proximity to theseal member 17 and axially inward of the rotational axis of therotary member 19. - With such a configuration, it is enabled to select the bearing with a priority given to the support mechanism of the
cylindrical member 19. That is, there is no need for using a specific bearing involving the sealing function, resulting in a capability of being liberated from restriction in designing and in a layout space to enable remarkable reduction in the manufacturing cost. - Naturally, a general-purpose seal member can be selected for preference to form the
seal member 17. - Further, a plurality of
stud bolts 31 are located on the front distal end (fore end 19 a) of the cylindrical member (case-like torque transmitting member) 19 at circumferentially spaced positions along the rotational axis of thecylindrical member 19, with theseal member 17 being disposed in an area of thecylindrical member 19 at a position radially outward of thestud bolts 31. - With such particular arrangement, related components are enabled to be connected to one another through the use of the
stud bolts 31, which also enable theseal member 17 to be located at a desired position. - Also, while, in the presently filed embodiment, the
washer 200 is intended to prevent thedust cover 15 from missing from thecylindrical member 19 toward a radially outward area of the rotational axis of thecylindrical member 19, a companion flange (seeFIG. 8 ) or a joint fork (seeFIG. 8 ) integrally formed with the companion flange may serve as means for preventing thedust cover 15 from missing from thecylindrical member 19. - Further, in conjunction with
FIG. 2 , the inner shaft 5 (shaft-like torque transmitting member) is disposed in an inner periphery of the cylindrical member (case-like torque transmitting member) 19, with themain clutch 7 being interposed between these power transmitting members. With this configuration, the seal structure of the present invention has a favorable sealing property for a prolonged time period even when applied to a device in which themain clutch 7, whose operating temperature is anticipated to rise, is mounted for connecting or disconnecting the drive power output. - Furthermore, in conjunction with
FIG. 2 , while theelectromagnet 13, disposed in axially close proximity to thepilot clutch 11, produces a magnetic field for thepilot clutch 11 to attract the same for thereby uncoupling thepilot clutch 11, it is possible for the cylindrical member (case-like torque transmitting member) 19 to be made of material to limit the generation of the magnetic field of theelectromagnet 13. - While the cylindrical member (case-like torque transmitting member) 19 of the
electromagnet clutches electromagnet 13, is made of non-magnetic material such as aluminum alloy or austenite stainless steel to avoid the leakage of the magnetic flux and, in an on-vehicle device, attempts have been made to decrease a loss in a battery, which serves as a power supply of the electromagnet, to improve fuel consumption of the prime mover, the presence of the dust cover, mounted to the case-like torque transmitting member in a manner as set forth above, provides a capability of avoiding the sliding contact between the case-like torque transmitting member and the seal member and, so, the present invention is particularly advantageous in such a structure employing the electromagnet clutch. - According to the presently filed embodiment, further, the
seal member 17 is fixed to thefore end 111 a of thefront housing 111, and thefront housing 111 has the radially inwardly extendingbent portion 140 formed at the opening of thefront housing 111 such that a distance (rS2) between a center C of axis of thecylindrical member 19 and a fixed surface of theseal member 17 is smaller than a distance (rB2) (i.e., rS2<rB2) between the center c of axis and an outer diametrical surface of thebearing 25. - Consequently, it becomes possible to select a fixing surface with a diameter in a further smaller value without a restriction in which the fixing surface of the
seal member 17 becomes larger than a radius of curvature of the outer peripheral surface of the bearing. - Further, such a configuration also provides an improved assembling performance of the
seal member 17 and thebearing 25. - Furthermore, the presence of the
bent portion 140 allows the bearing 25 to be positioned at one side of the rotational axis of thecylindrical member 19. - This advantage is similarly obtained in the structures of subsequent embodiments.
- Also, the
seal member 17 has a sliding radius (rs1) of curvature smaller than that of the rotational radius (rB1) of curvature of the bearing 25 (i.e., rS1<rB1). - Such a particular configuration enables a sliding speed to be reduced, resulting in a further improved sealing property.
- This may be similarly applied to the sliding surface of at least one of the sliding portions in the structure of the subsequent embodiments.
- Moreover, in conjunction with
FIG. 1 , thefront housing 111 is the cover that is mounted to a distal end of thedifferential carrier 314 and the cylindrical member (case-like torque transmitting member) 19 has the front distal end exposed to the opening portion formed at the end of thefront housing 111 to permit the drive power output to be connected to one of the input shaft and output shaft. And, the inner shaft (shaft-like torque transmitting member) 5 disposed in the inner peripheral side of the cylindrical member (case-like torque transmitting member) 19 is connected to one drive shaft of the input shaft and the output shaft via theclutches - The use of the seal structure embodying the present invention in such a drive power transmitting device mentioned above enables the device per se and associated structures to be formed in a compact configuration with a minimum layout space.
- Also, the
seal member 141 is comprised of a retainingfixture 135 and aseal portion 133 which are integrally formed with one another. The retainingfixture 135 is press fitted to an inner periphery of therear housing 113, with theseal portion 133 being held in sliding contact with the outer periphery of therotor 21. Since therotor 21 is made of iron alloy to have a high hardness, there is less probability of wear due to the sliding contact with theseal portion 133 to have an extended durability. - Further, disposed between the core 29 of the
electromagnet 13 and therear housing 113 are thedish spring 137 and thewasher 139, with thedish spring 137 exerting an urging force to therotary case 3 and theinner shaft 5 which are consequently pressed forward to eliminate an axial clearance between theelectromagnetic coupling 1 and thehousing 14. - With the axial clearance being reduced, an axial vibration is removed from associated sliding regions between the
respective seal members seal members cylindrical member 19 and rotor 21), resulting in a remarkable increase in the durability of the sliding regions. - Further, formed at an outer periphery of the
front housing 111 forming the housing 14 a plurality of coolingfins 139 which cools the space inside thehousing 14 and theelectromagnetic coupling 1 located in such a space. - In such a way, the essential part of the seal structure of the first embodiment according to the present invention for use in the
electromagnet coupling 1 is structured. - As set forth above with reference to the first embodiment of the present invention, with such a seal structure, the
electromagnetic coupling 1 concerns the presence of the seal portion 123 (lips 127, 129) of theseal 17 held in sliding contact with thedust cover 15 made of iron alloy and having the high hardness whereby thecylindrical member 19 is avoided from sliding on theseal portion 123 to preclude thecylindrical portion 19 from being worn due to the sliding contact. - Accordingly, it becomes possible for the
cylindrical member 19 to be made of aluminum alloy, resulting in theelectromagnetic coupling 1 with a remarkable light weight. - The presence of the light weight of the
electromagnetic coupling 1 renders theelectromagnetic coupling 1 to have a minimized inertia of momentum with less unbalance in rotation and less vibration due to such unbalanced rotation while minimizing the fuel consumption of the engine. - Further, the utilization of the wear-resistant property of the
dust cover 15 provides no need for a component specific for sealing, such as a collar, to improve the wear-resistance property to be additionally and newly prepared, avoiding an increase in the number of component parts and their costs, management costs of the component parts and working costs for assembly. - Furthermore, with the seal structure set forth above, since the
seal member 17 is disposed between thedust cover 15 and the front housing 111 (stationary member) (i.e., thedust cover 15 ad theseal member 17 are located in the same location), the seal structure has a narrower layout space than that of the related art coupling in which the seal and the dust cover are disposed in separate locations, resulting in a simplified structure of theelectromagnetic coupling 1 involving thedust cover 15. - Moreover, the presence of the
cylindrical member 19 made of aluminum alloy (non-magnetic material) precludes the magnetic flux from being leaked for eliminating loss in the battery serving as the power supply of theelectromagnet 13, resulting in a further reduction in the fuel consumption of the engine. Thus the present invention, which enables thecylindrical member 19 to be made of the non-magnetic material, is particularly advantageous in a rotary member such as theelectromagnetic coupling 1 that causes the clutch to be intermittently coupled or uncoupled with the electromagnet. - In addition to an attempt to prepare the
cylindrical member 19 made of light metal such as aluminum alloy, thecylindrical member 19 may be made of austenite stainless steel with a relatively low hardness and, further, if a sufficient strength is obtained, thecylindrical member 19 may be made of plastic resin. - Further, with the embodiment discussed above, the main clutch 7 functions as a mechanism to transmit the drive power output between the case-like torque transmitting member (rotary case 3) and the axial torque transmitting member (inner shaft 5). Thus, only the presence of the
outer plates 53 and theinner plates 57 has no meaning, and in addition to therespective plates rotary case 3 and theinner shaft 5 similarly constitute essential components of themain clutch 7. - Furthermore, in the same reason, the
pilot clutch 11 is comprised of therotary case 3, thecam ring 63, theouter plates 69 and the inner plates 71 all of which serve as essential components. - Moreover, the
ball cam 9 includes a cam mechanism, for converting the resulting drive torque into the urging force, which is comprised of not only thepressure plate 61, thecam ring 63, the cam surface formed thereon and a plurality of balls disposed between adjacent components, but also theinner shaft 5 to transmit the drive power output to thepressure plate 61, therotary case 3 for transmitting the drive power output to thecam ring 63, and thepilot clutch 11, all of which form essential components. - Further, the
main clutch 7 and thepilot clutch 11 may include clutches of any types involving, in addition to the multiple plate type clutches, frictional clutches, such as single plate clutches and cone type clutches. Also, these clutches may of wet types or dry types. - Furthermore, the present invention is not limited to a particular structure shown in the presently filed embodiment in which the electromagnet clutch is structured with the pilot clutch and the cam mechanism to couple the main clutch, and may take the form of a structure wherein the main clutch is directly urged with an armature adapted to be moveably operated with an electromagnet or a spring.
- Further, the seal structure of the present invention may be widely applied to rotational members and may be applied to not only the coupling adapted to be coupled or uncoupled by means of the clutch as in the presently filed embodiment but also a coupling such as one of the related art which is operative to transmits torque by means of shearing resistance of a viscous fluid without coupling or uncoupling operations.
-
FIG. 4 is an enlarged cross sectional view illustrating an essential part of a seal structure of a second embodiment according to the present invention. This embodiment is a modified form of the first embodiment and has the same structure as that of the first embodiment except in that a sliding area between aduct cover 15 b and aseal member 17 b is located in close proximity to thefront housing 111. Accordingly, like parts bear like reference numerals as those used in the first embodiment to omit description of the same parts. - The
seal member 17 b is comprised of a retaining fixture (support member) 121 b and aseal portion 123 b which are integrally formed, with theseal portion 123 b being formed with three pieces oflips - The retaining
fixture 121 b is press fitted to an outer periphery of thefore end 19 a of thecylindrical member 19 via abase portion 124 b of theseal portion 123 b. A press fitted area may be additionally applied with sealing material. Also, thelips dust cover 15 b. In particular, thelips thrust surface 150 b of thenose 111 a of thefront housing 111 concentric with the rotational axis of thecylindrical member 19, with an annular sliding portion being defined between thethrust surface 150 b and theseal portion 123 b. Moreover, thelip 129 b is held in contact with a radial surface (side wall) 117 b of thedust cover 15 b concentric with the rotational axis of thecylindrical member 19, with an annular sliding portion being formed between thethrust surface 117 b and theseal portion 123 b. - Further, the
dust cover 15 b has an overlappingportion 119 b which is axially opened with a given space defined relative to the outer periphery of thefore end 19 a of thecylindrical member 19 and, in the second embodiment, the overlappingportion 119 b is opened outward with respect to the rotational axis of thecylindrical member 19. In this case, although the opening of the overlappingportion 119 b is directed in the same direction as that in which the foreign material enters, since the opening of the overlappingportion 119 b is closed with thewasher 200, which is described in connection with the first embodiment, interposed between thenuts 210 of thestud bolts 31 and the distal end (fore end 19 a) of thecylindrical member 19, it is possible to obtain an adequate effect for limiting the entry of the foreign material. Of course, such a structure is also capable of preventing thedust cover 15 b from missing from thefront housing 111. - Also, such a limiting effect is obtained by closing the opening of the overlapping
portion 119 b with the companion flange (seeFIG. 8 ) or the joint fork (seeFIG. 8 ) integrally formed with the companion flange in place of thewasher 200. - From the foregoing description, it is to be noted that the seal structure of the second embodiment also has the same advantage as that of the first embodiment.
-
FIG. 5 is an enlarged cross sectional view illustrating an essential part of a seal structure of a third embodiment according to the present invention. This embodiment has the same structure as that of the first embodiment except in that aseal member 17 c is also held in sliding contact with thecylindrical member 19 via a slidingsurface 150 c of ahard sleeve member 155 c made of hard material. Accordingly, like parts bear like reference numerals as those used in the first embodiment to omit description of the same parts. - The
seal member 17 c is comprised of a retaining fixture (support member) 121 c and aseal portion 123 c which are integrally formed, with theseal portion 123 c being formed with two pieces oflips - The retaining
fixture 121 c is press fitted to an inner periphery of thefore end 111 a of thefront housing 111 via abase portion 124 c of theseal portion 123 c. A press fitted area may be additionally applied with sealing material. Also, thelips hard member 155 c. In particular, thelips surface 150 c of thehard member 155 c concentric with thecylindrical member 19, with an annular sliding portion being formed between the slidingsurface 150 c and theseal portion 123 c. - The presently filed embodiment has an advantage, in addition to the advantages achieved by the first embodiment, in that, in a case where material (aluminum alloy, stainless, brass or carbon) is selected for the cylindrical member (case-like member) 19 for the purpose of forming the
cylindrical member 19 in a light weight and using non-magnetic material, the presence of the sliding portion formed between thefore end 19 a of thecylindrical member 19 and thehard member 155 c provides a capability for theseal member 17 c to have a sealing capability and sliding characteristic maintained under a favorable condition for a prolonged time period. -
FIG. 6 is an enlarged cross sectional view illustrating an essential part of a seal structure of a fourth embodiment according to the present invention. This embodiment is a modified form of the third embodiment and has the same structure as that of the third embodiment except in that ahard sleeve member 155 d is disposed in thefront housing 111. Accordingly, like parts bear like reference numerals as those used in the third embodiment to omit description of the same parts. - The
seal member 17 d is comprised of a retaining fixture (support member) 121 d and aseal portion 123 d which are integrally formed with one another, with theseal portion 123 d being formed with three pieces oflips - The retaining
fixture 121 d is press fitted to an outer periphery of thefore end 19 a of thecylindrical member 19 via abase portion 124 d of theseal portion 123 d. A press fitted area may be additionally applied with sealing material. Also, thelips sleeve 155 d. In particular, thelips fore end 111 a of thefront housing 111 via thehard member 155 d. In particular, thelips thrust surface 150 d of thehard member 155 d concentric with the rotational axis of thecylindrical member 19, with an annular sliding portion being formed between thethrust surface 150 d and theseal portion 123 d. Further, thelip 129 d is held in contact with a radial surface (side wall) 117 d of thedust cover 15 d concentric with the rotational axis of thecylindrical member 19, with an annular sliding portion being formed between theradial surface 117 d and theseal portion 123 d. - Further, the
dust cover 15 d has an overlappingportion 119 d which is axially opened with a given space defined relative to the outer periphery of thefore end 19 a of thecylindrical member 19 and, in the third embodiment, the overlappingportion 119 d is opened axially outward with respect to the rotational axis of thecylindrical member 19. In this case, although the opening of the overlappingportion 119 d is directed in the same direction as that in which the foreign material enters, since the opening of the overlappingportion 119 d is closed with thewasher 200, which is described in connection with the first embodiment, interposed between thenuts 210 of thestud bolts 31 and the distal end (fore end 19 a) of thecylindrical member 19, it is possible to obtain an adequate effect for limiting the entry of the foreign material. Of course, such a structure is also capable of preventing thedust cover 15 d from missing from thefront housing 111. - Also, such a limiting effect is obtained by closing the opening of the overlapping
portion 119 d with the companion flange (seeFIG. 8 ) or the joint fork (seeFIG. 8 ) integrally formed with the companion flange in place of thewasher 200. - From the foregoing description, it is to be noted that the seal structure of the fourth embodiment also has the same advantage as that of the third embodiment.
-
FIG. 7 is an enlarged cross sectional view illustrating an essential part of a seal structure of a fifth embodiment according to the present invention. This embodiment has the same structure as that of the third embodiment except in that a sliding portion is formed between a treatedsurface 200 and aseal member 17 e. Accordingly, like parts bear like reference numerals as those used in the third embodiment to omit description of the same parts. - The
seal member 17 e is comprised of a retaining fixture (support member) 121 e and aseal portion 123 e which are integrally formed with one another, with theseal portion 123 e being formed with two pieces oflips - The retaining
fixture 121 e is press fitted to an inner periphery of thefore end 111 a of thefront housing 111 via abase portion 124 e of theseal portion 123 e. A press fitted area may be additionally applied with sealing material. Also, thelips fore end 19 a of thecylindrical member 19. In particular, thelips fore end 19 a of thecylindrical member 19, with an annular sliding portion being formed between thethrust surface 200 a and theseal portion 123 e. - According to this embodiment, the seal structure has, in addition to the effects of the third embodiment, an improved strength of the sliding portion while enabling the corrosion resistant property, the heat-resistant property and the anti-wearing property to be further improved.
- Also, the surface hardening treatment involves heat treatment such as tempering/quenching or carbonizing and anode oxidizing treatment and, in addition to these treatments, further involves PTFE coating providing a self-lubricating property, nickel dispersion plating, chrome plating and electroless nickel plating.
- Further, a stepped
portion 200 c formed between adjacent treatedsurfaces fore end 19 a of thecylindrical member 19 such that the steppedportion 200 c permits thedust cover 15 e to be positioned at one side of the rotational axis of thecylindrical member 19. -
FIG. 8 is an enlarged cross sectional view illustrating an essential part of a seal structure of a sixth embodiment according to the present invention. This embodiment has the same structure as that of the first embodiment except in that adust cover 15 f is fixed to a centeringportion 170 a of ajoint fork 170 f integrally formed with acompanion flange 180 as a coupling. Accordingly, like parts bear like reference numerals as those used in the first embodiment to omit description of the same parts. - The
seal member 17 f is comprised of a retaining fixture (support member) 121 f and aseal portion 123 f which are integrally formed with one another, with theseal portion 123 f being formed with two pieces oflips - The retaining
fixture 121 f is press fitted to thenose 111 a of thefront housing 111 via abase portion 124 f of theseal portion 123 f. A press fitted area may be additionally applied with sealing material. Thedust cover 15 f is secured to the centeringportion 170 a of thejoint fork 170 f formed with thecompanion flange 180 as the coupling. And, thelips dust cover 15 f. In particular, thelips dust cover 15 f concentric with the rotational axis of thecylindrical member 19, with an annular sliding portion being formed between thethrust surface 150 f and theseal portion 123 f. - Thus, the cylindrical member (case-like torque transmitting member) 19 is structured with the
inner shaft 5 and the joint fork (integrally formed with thecompanion flange 180 as the coupling) 170 f which is unitarily connected to theinner shaft 5. And, thedust cover 15 f is secured to the centeringportion 170 a of thejoint fork 170 f. - Further, the
joint fork 170 f is formed with a steppedportion 170 c to allow thedust cover 15 f to be positioned to one side of the rotational axis. - According to this embodiment, the seal structure has, in addition to the effects of the first embodiment, the provision of an additional shaft member such as the joint fork (or companion flange 180) 170 f results in an ease of assembling and fixing the
dust cover 15 f. Accordingly, an assembling capability with respect to theseal member 17 f is highly improved. - Furthermore, the freedom of designing a shape of the shaft member and selecting the seal member is highly improved.
-
FIG. 9 is an enlarged cross sectional view illustrating an essential part of a seal structure of a seventh embodiment according to the present invention. This embodiment is a modified form of the sixth embodiment and has the same structure as that of the sixth embodiment except in that a structure is provided to position adust cover 15 g at one side of the rotational axis and to prevent thedust cover 15 g from missing with thewasher 200. Accordingly, like parts bear like reference numerals as those used in the sixth embodiment to omit description of the same parts. - The
seal member 17 g is comprised of a retaining fixture (support member) 121 g and aseal portion 123 g which are integrally formed with one another, with theseal portion 123 g being formed with three pieces oflips 125 g, 127 g, 129 g. - The retaining
fixture 121 g is press fitted to thenose 111 a of thefront housing 111 via abase portion 124 g of theseal portion 123 g. A press fitted area may be additionally applied with sealing material. Thedust cover 15 g is secured to the centeringportion 170 a′ of thejoint fork 170 g formed with thecompanion flange 180 as the coupling. And, the lips 125 g, 127 g are held in sliding contact with thedust cover 15 g. In particular, the lips 125 g, 127 g are held in sliding contact with a thrust surface (treated surface) 150 g of thedust cover 15 g concentric with the rotational axis of thecylindrical member 19, with an annular sliding portion being formed between the thrust surface 150 g and theseal portion 123 g. - Thus, the cylindrical member (case-like torque transmitting member) 19 is structured with the
inner shaft 5 and the joint fork (integrally formed with thecompanion flange 180 as the coupling) 170 g which is unitarily connected to theinner shaft 5. And, thedust cover 15 g is secured to the centeringportion 170 a of thejoint fork 170 g. - When securing the
dust cover 15 g in a fixed place, thewasher 200 is interposed between thejoint fork 170 g and the distal end (fore end 19 a) of thecylindrical member 19 and fixed in place with thenuts 210 tightened to thebolts 31. - Further, in the presently filed embodiment, the
joint fork 170 g is formed with a steppedportion 170 c′ to allow thedust cover 15 g to be positioned to one side of the rotational axis and prevented from axially missing outward with respect to the rotational axis. - From the foregoing description, it appears that the seventh embodiment also has various effects similar to those of the sixth embodiment.
- Although the present invention has been described above by reference to certain embodiments of the invention, the invention is not limited to the embodiments described above and modifications will occur to those skilled in the art, in light of the teachings. The scope of the invention is described with reference to the following claims.
Claims (11)
1. A seal structure, separated from a race portion of a bearing structure, for sealing a gap between a first member and a second member disposed to be rotational relative to the first member, the seal structure comprising:
a cover member preventing foreign material from entering the gap; and
a seal member fixedly secured to at least one of the first and second members and held in sliding contact with the cover member to seal the gap,
wherein the seal member is held in sliding contact with a sliding surface of the other of the first and second members and the sliding surface is formed with hard material.
2. The seal structure according to claim 1 , wherein the first member has a bent portion positioning the bearing structure from a direction opposite to the seal member.
3. The seal structure according to claim 1 , wherein a distance between a fixed surface of the seal member and a center of a rotational axis of the second member is smaller than a distance between an outer diametrical surface of the bearing structure and the center of the rotational axis of the second member.
4. A seal structure for sealing a gap between a first member and a second member disposed to be rotational relative to the first member, the seal structure comprising:
a cover member preventing foreign material from entering the gap; and
a seal member fixedly secured to at least one of the first and second members, disposed between the cover member and a bearing, and held in sliding contact with a sliding surface of the other of the first and second members,
wherein a distance between a fixed surface of the seal member and a center of a rotational axis of the second member is smaller than a distance between an outer diametrical surface of the bearing and the center of the rotational axis of the second member.
5. The seal structure according to claim 4 , wherein the sliding surface is formed with hard material.
6. The seal structure according to claim 4 , wherein the sliding surface is subjected to a surface hardening treatment.
7. The seal structure according to claim 4 , wherein the first member has a bent portion positioning the bearing from a direction opposite to the seal member.
8. The seal structure according to claim 7 , wherein the bent portion has an inner periphery surface fixed with the seal member and an end surface fixedly secured to the bearing.
9. The seal structure according to claim 4 , wherein the seal member has a sliding radius of curvature smaller than a rotating radius of curvature of the bearing.
10. The seal structure according to claim 4 , the seal member is provided in an area close to the bearing.
11. The seal structure according to claim 4 , wherein the cover member has a bending portion extending along the rotational axis of the second member.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/408,398 US20060186605A1 (en) | 2002-09-25 | 2006-04-20 | Seal structure for relatively rotational members |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/254,400 US7063193B2 (en) | 2002-09-25 | 2002-09-25 | Seal structure for relatively rotational members |
US11/408,398 US20060186605A1 (en) | 2002-09-25 | 2006-04-20 | Seal structure for relatively rotational members |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/254,400 Division US7063193B2 (en) | 2002-09-25 | 2002-09-25 | Seal structure for relatively rotational members |
Publications (1)
Publication Number | Publication Date |
---|---|
US20060186605A1 true US20060186605A1 (en) | 2006-08-24 |
Family
ID=31993360
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/254,400 Expired - Lifetime US7063193B2 (en) | 2002-09-25 | 2002-09-25 | Seal structure for relatively rotational members |
US11/408,398 Abandoned US20060186605A1 (en) | 2002-09-25 | 2006-04-20 | Seal structure for relatively rotational members |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
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US10/254,400 Expired - Lifetime US7063193B2 (en) | 2002-09-25 | 2002-09-25 | Seal structure for relatively rotational members |
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US (2) | US7063193B2 (en) |
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US20130119615A1 (en) * | 2005-08-01 | 2013-05-16 | Aktiebolaget Skf | Sealing device and method of producing the same |
US10883552B2 (en) | 2019-04-10 | 2021-01-05 | Warner Electric Technology Llc | Rotational coupling device with flux conducting bearing shield |
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US7063193B2 (en) * | 2002-09-25 | 2006-06-20 | Tochigi Fuji Sangyo Kabushiki Kaisha | Seal structure for relatively rotational members |
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US20110278801A1 (en) * | 2010-05-11 | 2011-11-17 | Morgan Construction Company | Neck seal |
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CN103203271B (en) * | 2013-04-19 | 2014-10-01 | 昆山聚贝机械设计有限公司 | Dust-proof structure of bearing for classification wheel of jet mill |
US10533608B2 (en) | 2017-02-07 | 2020-01-14 | General Electric Company | Ring seal for liquid metal bearing assembly |
CN107061742A (en) * | 2017-03-30 | 2017-08-18 | 深圳市创为安防有限公司 | A kind of power transmission shaft waterproof sealing structure |
US20190226584A1 (en) * | 2018-01-19 | 2019-07-25 | American Axle & Manufacturing, Inc. | Lip seal with air-side spring |
US10907689B2 (en) | 2018-06-21 | 2021-02-02 | Freudenberg-Nok General Partnership | Heavy duty wheel seal with dry running resistance |
US20230417191A1 (en) * | 2022-06-27 | 2023-12-28 | Pratt & Whitney Canada Corp. | Bearing-supported shaft assembly |
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US10883552B2 (en) | 2019-04-10 | 2021-01-05 | Warner Electric Technology Llc | Rotational coupling device with flux conducting bearing shield |
Also Published As
Publication number | Publication date |
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US20040056428A1 (en) | 2004-03-25 |
US7063193B2 (en) | 2006-06-20 |
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Legal Events
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AS | Assignment |
Owner name: TOCHIGI FUJI SANGYO KABUSHIKI KAISHA, JAPAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:YOSHIDA, SHOUJI;REEL/FRAME:017801/0535 Effective date: 20020920 |
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STCB | Information on status: application discontinuation |
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