US20150240927A1 - Differential device - Google Patents
Differential device Download PDFInfo
- Publication number
- US20150240927A1 US20150240927A1 US14/628,647 US201514628647A US2015240927A1 US 20150240927 A1 US20150240927 A1 US 20150240927A1 US 201514628647 A US201514628647 A US 201514628647A US 2015240927 A1 US2015240927 A1 US 2015240927A1
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- United States
- Prior art keywords
- sleeve
- differential
- tube portion
- screwed
- differential case
- 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.)
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Classifications
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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
- F16H—GEARING
- F16H48/00—Differential gearings
- F16H48/38—Constructional details
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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
- F16H—GEARING
- F16H48/00—Differential gearings
- F16H48/38—Constructional details
- F16H48/40—Constructional details characterised by features of the rotating cases
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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
- F16H—GEARING
- F16H48/00—Differential gearings
- F16H48/06—Differential gearings with gears having orbital motion
- F16H48/08—Differential gearings with gears having orbital motion comprising bevel gears
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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
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/02—Gearboxes; Mounting gearing therein
- F16H57/029—Gearboxes; Mounting gearing therein characterised by means for sealing the gearboxes, e.g. to improve airtightness
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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
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/02—Gearboxes; Mounting gearing therein
- F16H57/037—Gearboxes for accommodating differential gearings
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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
- F16H—GEARING
- F16H48/00—Differential gearings
- F16H48/06—Differential gearings with gears having orbital motion
- F16H48/08—Differential gearings with gears having orbital motion comprising bevel gears
- F16H2048/082—Differential gearings with gears having orbital motion comprising bevel gears characterised by the arrangement of output shafts
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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
- F16H—GEARING
- F16H48/00—Differential gearings
- F16H48/38—Constructional details
- F16H2048/387—Shields or washers
Definitions
- the present invention relates to an improvement of a differential device comprising: a differential gear mechanism; and an integrated differential case housing the differential gear mechanism, the differential case including first and second bearing bosses formed integrally on one side portion and another side portion of the differential case and aligned on a same axis to be rotatably supported by a transmission case; a work window for inserting the differential gear mechanism, the work window being provided in a peripheral wall of the differential case; and a pair of sleeves fitted and inserted to the first and second bearing bosses from outer end sides thereof and respectively connected to a pair of left and right side gears of the differential gear mechanism, wherein oil seals are to be set between outer end portions of the sleeves which protrude from the first and second bearing bosses and the transmission case, and left and right drive shafts are to be fitted and inserted into the sleeves and to be spline-fitted to hubs of the pair of side gears.
- Such a differential device is known as disclosed in Japanese Patent No. 3751488 and Japanese Patent Application Laid-open No. 2013-72524.
- the sleeves are fitted and inserted into the first and second bearing bosses from the outside to be spline-fitted to the side gears.
- a total length thereof becomes longer than an inside diameter of the integrated differential case, and the side gear and the sleeve cannot be incorporated into the differential case.
- the sleeve is fastened to the side gear by pressure welding or fusion welding to prevent lubricating oil in the differential case from leaking out of a space between the side gear and the sleeve.
- a special process such as pressure welding or fusion welding is an obstacle to improving efficiency of assembly.
- the present invention has been made in view of the above-described circumstances, and an object of the present invention is to provide a differential device in which lubricating oil in a differential case is prevented from leaking out of a space between a side gear and a sleeve without performing a special process such as pressure welding or fusion welding during assembly and which has good ease of assembly.
- a differential device comprising: a differential gear mechanism; and an integrated differential case housing the differential gear mechanism, the differential case including first and second bearing bosses formed integrally on one side portion and another side portion of the differential case and aligned on a same axis to be rotatably supported by a transmission case; a work window for inserting the differential gear mechanism, the work window being provided in a peripheral wall of the differential case; and a pair of sleeves fitted and inserted to the first and second bearing bosses from outer end sides thereof and respectively connected to a pair of left and right side gears of the differential gear mechanism, wherein oil seals are to be set between outer end portions of the sleeves which protrude from the first and second bearing bosses and the transmission case, and left and right drive shafts are to be fitted and inserted into the sleeves and to be spline-fitted to hubs of the pair of side gears, wherein a tube portion is integrally provided in a protruding
- the sleeve can be integrally connected to the side gear by screwing and fastening the sleeve onto the side gear.
- the above-described screwing and fastening can bring the first and second sealing surfaces of the side gear and the sleeve into tight contact with each other, and makes a seal which shuts off communication between the inside of the differential case and a screwed portion between the tube portion of the side gear and the sleeve. Accordingly, a seal member is unnecessary, and liquid tightness between the side gear and the sleeve can be achieved by a simple structure. This can contributes to an improvement in ease of assembly.
- an annular recessed portion facing an outer periphery of an outer end portion of the tube portion is provided on an inner periphery of the sleeve, and a locknut pressing the sleeve inward in an axial direction is screwed and fastened onto the outer periphery of the tube portion in the annular recessed portion.
- the locknut pressing the sleeve inward in the axial direction can suppress looseness of the screwed portion between the tube portion of the side gear and the sleeve.
- tapered surfaces pressing each other are formed in the annular recessed portion and the locknut, respectively, and the tapered surfaces are decentered from each other.
- the third aspect of the present invention by pressing the tapered surface of the locknut into the tapered surface of the sleeve, lateral pressure in such a direction that an amount of decentering reduces is generated on contact surfaces of the opposite tapered surfaces on one side, and frictional force on a screwed portion between the tube portion and the locknut on one side can be effectively increased.
- the first and second sealing surfaces are tapered.
- a wedge effect obtained by pressing the second sealing surface of the sleeve into the first sealing surface of the side gear can increase contact pressure between the first and second sealing surfaces and can improve sealability between the opposite sealing surfaces.
- FIG. 1 is a longitudinal sectional elevation view of a differential device according to a first embodiment of the present invention.
- FIG. 2 is an elevation view of a differential case of the above-described differential device.
- FIG. 3 is a longitudinal sectional elevation view of a differential device according to a second embodiment of the present invention.
- FIG. 4 is an enlarged longitudinal sectional elevation view of a differential device according to a third embodiment of the present invention.
- a differential device D is housed in a transmission case 1 of an automobile.
- This differential device D includes an integrated differential case 2 and a differential gear mechanism 3 housed in the differential case 2 .
- a first bearing boss 4 and a second bearing boss 5 aligned on a same axis X are formed integrally therewith. These first and second bearing bosses 4 , 5 are supported by the transmission case 1 via bearings 6 , 6 ′.
- the differential gear mechanism 3 includes a pinion shaft 9 held by the differential case 2 to pass through a center C of the differential case 2 while being orthogonal to the axis X, a pair of pinion gears 10 supported by the pinion shaft 9 , a pair of side gears 11 meshing with the pinion gears 10 , and a pair of sleeves 20 screwed and fastened onto the side gears 11 and rotatably supported by the first and second bearing bosses 4 , 5 , respectively.
- a back face of each gear is rotatably supported by a spherical inner surface of the differential case 2 .
- Helical lubrication grooves 21 are formed in inner peripheral surfaces of the first and second bearing bosses 4 , 5 .
- the pinion shaft 9 is held by a pair of supporting holes 12 in an outer peripheral portion of the differential case 2 .
- the outer peripheral portion of the differential case 2 is provided with a pin hole 13 laterally passing through the outer peripheral portion to be orthogonal to one of the supporting holes 12 .
- a falling-off prevention pin 14 press-fitted into the pin hole 13 passes through the pinion shaft 9 . This achieves prevention of the falling off of the pinion shaft 9 from the supporting holes 12 .
- the differential case 2 has an annular flange 15 formed integrally therewith on an intermediate portion which is offset from the center C thereof toward the second bearing boss 5 side.
- a ring gear 17 meshing with an output gear 16 of a gearbox is fastened to the flange 15 with bolts 22 .
- a pair of work windows 18 for machining the spherical inner surface of the differential case 2 and for facilitating insertion of the differential gear mechanism 3 into the differential case 2 are provided.
- the hub 11 a of the side gear 11 is formed in a shape of a bottomed cylinder having a bottom portion 11 a 1 facing toward the pinion shaft 9 .
- a tube portion 11 b is integrally provided in a protruding manner.
- an external thread 11 c onto which the sleeve 20 and the locknut 26 are screwed is formed.
- annular first sealing surface 11 d surrounding a base of the tube portion 11 b is formed in the hub 11 a.
- an internal thread 20 a is formed which is screwed onto the external thread 11 c .
- an annular recessed portion 20 b is provided from an outer end of the internal thread 20 a to an outer end of the sleeve 20 .
- a tapered surface 20 c is formed at a corner portion of an inner end of the annular recessed portion 20 b .
- An outer end side half portion of the tube portion 11 b which is exposed from an outer end of the external thread 20 a faces the annular recessed portion 20 b .
- annular protruding portion 20 d is provided which protrudes inward in an axial direction.
- annular second sealing surface 20 e facing the first sealing surface 11 d is formed.
- the inner end portion of the sleeve 20 is screwed and fastened onto the outer periphery of the tube portion 11 b of the side gear 11 to integrally connect the sleeve 20 to the side gear 11 .
- the above-described screwing and fastening brings the first and second sealing surfaces 11 d , 20 e of the side gear 11 and the sleeve 20 into tight contact with each other to shut off communication between an inside of the differential case 2 and a screwed portion S between the tube portion 11 b and the sleeve 20 .
- the locknut 26 includes a threaded portion 26 b having the internal thread 26 a to be screwed onto the external thread 11 c and an operating portion 26 c continuous with an outer end of the threaded portion 26 b and more thick-walled than the threaded portion 26 b .
- a tool engagement hole 26 d is provided in an outer end surface of the operating portion 26 c .
- a tapered surface 26 e facing the tapered surface 20 c is formed on an outer periphery of an inner end portion of the threaded portion 26 b .
- the operating portion 26 c is operated with a tool to insert the locknut 26 into the annular recessed portion 20 b of the sleeve 20 from an outer end thereof and to screw and fasten the locknut 26 onto the outer periphery of the tube portion 11 b of the side gear 11 .
- the tapered surface 26 e of the locknut 26 is pressed into the tapered surface 20 c of the inner end portion of the sleeve 20 to lock the sleeve 20 .
- the sleeves 20 are configured such that outer end portions thereof protrude from the corresponding bearing bosses 4 , 5 outward, and oil seals 25 are interposed between the outer end portions and the transmission case 1 , respectively.
- Left and right drive shafts 7 , 8 respectively connected to unillustrated left and right axles pass through the locknuts 26 and the sleeves 20 and are fitted to inner peripheries of the hubs 11 a of the side gears 11 via splines 29 .
- the left and right side gears 11 and the pinion gears 10 are first incorporated into the differential case 2 through the work window 18 in order.
- the tube portions 11 b of the side gears 11 are made to face inner peripheries of the first and second bearing bosses 4 , 5 .
- the pinion shaft 9 for supporting the pinion gears 10 is fitted and inserted into the supporting holes 12 of the differential case 2 , and the falling-off prevention pin 14 is press-fitted into the differential case 2 and the pinion shaft 9 .
- the left and right sleeves 20 are fitted and inserted into the corresponding first and second bearing bosses 4 , 5 from the outer ends thereof.
- the internal thread 20 a of the sleeve 20 is screwed and fastened onto the external thread 11 c of the side gear 11 until the second sealing surface 20 e of the sleeve 20 comes in tight contact with the first sealing surface 11 d of the side gear 11 , so as to shut off communication between the inside of the differential case 2 and the screwed portion S between the tube portion 11 b and the sleeve 20 .
- locknut 26 is inserted into the annular recessed portion 20 b of the sleeve 20 from the outer end thereof.
- a tool inserted into the tool engagement hole 26 d of the locknut 26 is turned to screw and fasten the internal thread 26 a of the locknut 26 onto the external thread 11 c of the side gear 11 .
- the tapered surface 26 e of the threaded portion 26 b is pressed into the tapered surface 20 c of the sleeve 20 .
- the sleeve 20 can be integrally connected to the side gear 11 by screwing and fastening the internal thread 20 a of the sleeve 20 onto the external thread 11 b of the side gear 11 . Accordingly, ease of assembly is good. Also, since the above-described screwing and fastening brings the first and second sealing surfaces 11 d , 20 e of the side gear 11 and the sleeve 20 into tight contact with each other, a seal is made which shuts off communication between the inside of the differential case 2 and the screwed portion S between the tube portion 11 b and the sleeve 20 . This eliminates the need for a seal member. Accordingly, liquid tightness between the side gear 11 and the sleeve 20 can be achieved by a simple structure.
- the differential device D assembled as described above is incorporated into the transmission case 1 , and oil seals 25 are set between the outer end portions of the sleeves 20 and the transmission case 1 . Then, lubricating oil is injected into the transmission case 1 . Part of the lubricating oil flows into the differential case 2 through the work windows 18 to be used for lubrication between various portions of the differential gear mechanism 3 .
- the lubricating oil in the transmission case 1 is prevented from flowing out of the outer peripheries of the outer end portions of the sleeves 20 by the oil seals 25
- the lubricating oil in the differential case 2 is prevented from flowing out of screwed portions S between the side gears 11 and the sleeves 20 by the tight contact between the first and second sealing surfaces 11 d , 20 e of the side gears 11 and the sleeves 20 .
- This means that the lubricating oil in the transmission case 1 and the differential case 2 does not flow out even when the drive shafts 7 , 8 are removed from the side gears 11 .
- the left and right drive shafts 7 , 8 are fitted to the inner peripheries of the hubs 11 a of the corresponding side gears 11 via the splines 29 .
- FIG. 3 Next, a second embodiment of the present invention shown in FIG. 3 will be described.
- the hub 11 a of the side gear 11 is provided with an annular recessed portion 30 which surrounds the base of the tube portion 11 b .
- the recessed portion 30 has a tapered first sealing surface 30 a formed on an inner peripheral surface thereof on a large-diameter side.
- a second sealing surface 20 f facing the first sealing surface 30 a is formed on an outer edge of an inner end of the protruding portion 20 d of the sleeve 20 .
- a wedge effect obtained by pressing the second sealing surface 20 f of the sleeve 20 into the first sealing surface 30 a of the side gear 11 can increase contact pressure between the first and second sealing surfaces 30 a , 20 f and can improve sealability between the opposite sealing surfaces 30 a , 20 f.
- FIG. 4 Next, a third embodiment of the present invention shown in FIG. 4 will be described.
- an axis A of the tapered surface 20 c of the sleeve 20 is matched with the axis X of each of the first and second bearing bosses 4 , 5 , and an axis B of a tapered surface 26 e of a locknut 26 ′ is decentered from the axis A by a certain amount e.
- the configuration of this embodiment is similar to that of the second embodiment. Accordingly, portions corresponding to those of the second embodiment are denoted by the same reference numerals in FIG. 4 , and explanations which have already been made in the second embodiment will be omitted.
- the present invention is not limited to the above-described embodiments, but various design changes can be made without departing from the gist thereof.
- the fastening of the ring gear 17 and the flange 15 with bolts may be replaced by joining by welding.
- plugs may be press-fitted to the inner peripheries of the hubs 11 a in a liquid tight manner instead of the bottom portions 11 a 1 of the hubs 11 a.
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Abstract
Description
- 1. Field of the Invention
- The present invention relates to an improvement of a differential device comprising: a differential gear mechanism; and an integrated differential case housing the differential gear mechanism, the differential case including first and second bearing bosses formed integrally on one side portion and another side portion of the differential case and aligned on a same axis to be rotatably supported by a transmission case; a work window for inserting the differential gear mechanism, the work window being provided in a peripheral wall of the differential case; and a pair of sleeves fitted and inserted to the first and second bearing bosses from outer end sides thereof and respectively connected to a pair of left and right side gears of the differential gear mechanism, wherein oil seals are to be set between outer end portions of the sleeves which protrude from the first and second bearing bosses and the transmission case, and left and right drive shafts are to be fitted and inserted into the sleeves and to be spline-fitted to hubs of the pair of side gears.
- 2. Description of the Related Art
- Such a differential device is known as disclosed in Japanese Patent No. 3751488 and Japanese Patent Application Laid-open No. 2013-72524.
- In the above-described differential device, after the differential gear mechanism including the side gears is incorporated into the integrated differential case through the work window, the sleeves are fitted and inserted into the first and second bearing bosses from the outside to be spline-fitted to the side gears. In other words, if the side gear and the sleeve are integrated, a total length thereof becomes longer than an inside diameter of the integrated differential case, and the side gear and the sleeve cannot be incorporated into the differential case.
- In the above-described conventional differential device, the sleeve is fastened to the side gear by pressure welding or fusion welding to prevent lubricating oil in the differential case from leaking out of a space between the side gear and the sleeve. However, during assembly, a special process such as pressure welding or fusion welding is an obstacle to improving efficiency of assembly.
- The present invention has been made in view of the above-described circumstances, and an object of the present invention is to provide a differential device in which lubricating oil in a differential case is prevented from leaking out of a space between a side gear and a sleeve without performing a special process such as pressure welding or fusion welding during assembly and which has good ease of assembly.
- In order to achieve the object, according to a first aspect of the present invention, there is provided a differential device comprising: a differential gear mechanism; and an integrated differential case housing the differential gear mechanism, the differential case including first and second bearing bosses formed integrally on one side portion and another side portion of the differential case and aligned on a same axis to be rotatably supported by a transmission case; a work window for inserting the differential gear mechanism, the work window being provided in a peripheral wall of the differential case; and a pair of sleeves fitted and inserted to the first and second bearing bosses from outer end sides thereof and respectively connected to a pair of left and right side gears of the differential gear mechanism, wherein oil seals are to be set between outer end portions of the sleeves which protrude from the first and second bearing bosses and the transmission case, and left and right drive shafts are to be fitted and inserted into the sleeves and to be spline-fitted to hubs of the pair of side gears, wherein a tube portion is integrally provided in a protruding manner at an outer end of the hub of each of the side gears, the sleeve is screwed and fastened onto an outer periphery of the tube portion, and in the side gear and the sleeve, first and second sealing surfaces are formed respectively to be brought into tight contact with each other by such screwing and fastening so as to shut off communication between an inside of the differential case and a screwed portion between the tube portion and the sleeve.
- According to the first aspect of the present invention, ease of assembly of the differential device is good, and, even when the drive shafts are removed from the differential device, lubricating oil in the transmission case and the differential case does not flow out and good ease of maintenance can be ensured.
- In particular, the sleeve can be integrally connected to the side gear by screwing and fastening the sleeve onto the side gear. Moreover, the above-described screwing and fastening can bring the first and second sealing surfaces of the side gear and the sleeve into tight contact with each other, and makes a seal which shuts off communication between the inside of the differential case and a screwed portion between the tube portion of the side gear and the sleeve. Accordingly, a seal member is unnecessary, and liquid tightness between the side gear and the sleeve can be achieved by a simple structure. This can contributes to an improvement in ease of assembly.
- According to a second aspect of the present invention, in addition to the first aspect, an annular recessed portion facing an outer periphery of an outer end portion of the tube portion is provided on an inner periphery of the sleeve, and a locknut pressing the sleeve inward in an axial direction is screwed and fastened onto the outer periphery of the tube portion in the annular recessed portion.
- According to the second aspect of the present invention, the locknut pressing the sleeve inward in the axial direction can suppress looseness of the screwed portion between the tube portion of the side gear and the sleeve.
- According to a third aspect of the present invention, in addition to the second aspect, tapered surfaces pressing each other are formed in the annular recessed portion and the locknut, respectively, and the tapered surfaces are decentered from each other.
- According to the third aspect of the present invention, by pressing the tapered surface of the locknut into the tapered surface of the sleeve, lateral pressure in such a direction that an amount of decentering reduces is generated on contact surfaces of the opposite tapered surfaces on one side, and frictional force on a screwed portion between the tube portion and the locknut on one side can be effectively increased. This strengthens a locking function of the locknut with respect to the tube portion and the sleeve, and can effectively prevent the looseness of a screwed portion between the sleeve and the tube portion.
- According to a fourth aspect of the present invention, in addition to the first aspect, the first and second sealing surfaces are tapered.
- According to the fourth aspect of the present invention, a wedge effect obtained by pressing the second sealing surface of the sleeve into the first sealing surface of the side gear can increase contact pressure between the first and second sealing surfaces and can improve sealability between the opposite sealing surfaces.
- The above and other objects, characteristics and advantages of the present invention will be clear from detailed descriptions of the preferred embodiments which will be provided below while referring to the attached drawings.
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FIG. 1 is a longitudinal sectional elevation view of a differential device according to a first embodiment of the present invention. -
FIG. 2 is an elevation view of a differential case of the above-described differential device. -
FIG. 3 is a longitudinal sectional elevation view of a differential device according to a second embodiment of the present invention. -
FIG. 4 is an enlarged longitudinal sectional elevation view of a differential device according to a third embodiment of the present invention. - Hereinafter, embodiments of the present invention will be described based on the accompanying drawings.
- First, a first embodiment of the present invention shown in
FIGS. 1 and 2 will be described. InFIG. 1 , a differential device D is housed in a transmission case 1 of an automobile. This differential device D includes an integrateddifferential case 2 and a differential gear mechanism 3 housed in thedifferential case 2. On a right side portion and a left side portion of thedifferential case 2, a first bearingboss 4 and a second bearingboss 5 aligned on a same axis X are formed integrally therewith. These first and second bearingbosses bearings - The differential gear mechanism 3 includes a pinion shaft 9 held by the
differential case 2 to pass through a center C of thedifferential case 2 while being orthogonal to the axis X, a pair of pinion gears 10 supported by the pinion shaft 9, a pair ofside gears 11 meshing with the pinion gears 10, and a pair ofsleeves 20 screwed and fastened onto theside gears 11 and rotatably supported by the first and second bearingbosses differential case 2.Helical lubrication grooves 21 are formed in inner peripheral surfaces of the first and second bearingbosses - The pinion shaft 9 is held by a pair of supporting
holes 12 in an outer peripheral portion of thedifferential case 2. The outer peripheral portion of thedifferential case 2 is provided with apin hole 13 laterally passing through the outer peripheral portion to be orthogonal to one of the supportingholes 12. A falling-offprevention pin 14 press-fitted into thepin hole 13 passes through the pinion shaft 9. This achieves prevention of the falling off of the pinion shaft 9 from the supportingholes 12. - Moreover, the
differential case 2 has an annular flange 15 formed integrally therewith on an intermediate portion which is offset from the center C thereof toward the second bearingboss 5 side. A ring gear 17 meshing with anoutput gear 16 of a gearbox is fastened to the flange 15 withbolts 22. - As shown in
FIG. 2 , in portions of a peripheral wall of thedifferential case 2 which face each other on a diametral line orthogonal to the axis X, a pair ofwork windows 18 for machining the spherical inner surface of thedifferential case 2 and for facilitating insertion of the differential gear mechanism 3 into thedifferential case 2 are provided. - Referring again to
FIG. 1 , the hub 11 a of theside gear 11 is formed in a shape of a bottomed cylinder having a bottom portion 11 a 1 facing toward the pinion shaft 9. At an outer end of the hub 11 a, atube portion 11 b is integrally provided in a protruding manner. On an outer periphery of thetube portion 11 b, anexternal thread 11 c onto which thesleeve 20 and thelocknut 26 are screwed is formed. - Moreover, an annular
first sealing surface 11 d surrounding a base of thetube portion 11 b is formed in the hub 11 a. - On an inner periphery of an inner end portion of the
sleeve 20, aninternal thread 20 a is formed which is screwed onto theexternal thread 11 c. Moreover, on an inner periphery of thesleeve 20, an annular recessedportion 20 b is provided from an outer end of theinternal thread 20 a to an outer end of thesleeve 20. At a corner portion of an inner end of the annular recessedportion 20 b, atapered surface 20 c is formed. An outer end side half portion of thetube portion 11 b which is exposed from an outer end of theexternal thread 20 a faces the annular recessedportion 20 b. Moreover, on an inner periphery side of an inner end of thesleeve 20, an annular protrudingportion 20 d is provided which protrudes inward in an axial direction. At a tip end of the protrudingportion 20 d, an annularsecond sealing surface 20 e facing thefirst sealing surface 11 d is formed. - Thus, the inner end portion of the
sleeve 20 is screwed and fastened onto the outer periphery of thetube portion 11 b of theside gear 11 to integrally connect thesleeve 20 to theside gear 11. Moreover, the above-described screwing and fastening brings the first andsecond sealing surfaces side gear 11 and thesleeve 20 into tight contact with each other to shut off communication between an inside of thedifferential case 2 and a screwed portion S between thetube portion 11 b and thesleeve 20. - The
locknut 26 includes a threadedportion 26 b having theinternal thread 26 a to be screwed onto theexternal thread 11 c and anoperating portion 26 c continuous with an outer end of the threadedportion 26 b and more thick-walled than the threadedportion 26 b. Atool engagement hole 26 d is provided in an outer end surface of theoperating portion 26 c. On an outer periphery of an inner end portion of the threadedportion 26 b, atapered surface 26 e facing thetapered surface 20 c is formed. - Thus, the
operating portion 26 c is operated with a tool to insert thelocknut 26 into the annular recessedportion 20 b of thesleeve 20 from an outer end thereof and to screw and fasten thelocknut 26 onto the outer periphery of thetube portion 11 b of theside gear 11. The taperedsurface 26 e of thelocknut 26 is pressed into the taperedsurface 20 c of the inner end portion of thesleeve 20 to lock thesleeve 20. - Moreover, the
sleeves 20 are configured such that outer end portions thereof protrude from the correspondingbearing bosses oil seals 25 are interposed between the outer end portions and the transmission case 1, respectively. - Left and
right drive shafts 7, 8 respectively connected to unillustrated left and right axles pass through thelocknuts 26 and thesleeves 20 and are fitted to inner peripheries of the hubs 11 a of the side gears 11 viasplines 29. - Next, operations of this embodiment will be described.
- When the differential device D is assembled, the left and right side gears 11 and the pinion gears 10 are first incorporated into the
differential case 2 through thework window 18 in order. Thetube portions 11 b of the side gears 11 are made to face inner peripheries of the first andsecond bearing bosses holes 12 of thedifferential case 2, and the falling-off prevention pin 14 is press-fitted into thedifferential case 2 and the pinion shaft 9. Then, the left andright sleeves 20 are fitted and inserted into the corresponding first andsecond bearing bosses internal thread 20 a of thesleeve 20 is screwed and fastened onto theexternal thread 11 c of theside gear 11 until thesecond sealing surface 20 e of thesleeve 20 comes in tight contact with thefirst sealing surface 11 d of theside gear 11, so as to shut off communication between the inside of thedifferential case 2 and the screwed portion S between thetube portion 11 b and thesleeve 20. - Finally, the
locknut 26 is inserted into the annular recessedportion 20 b of thesleeve 20 from the outer end thereof. A tool inserted into thetool engagement hole 26 d of thelocknut 26 is turned to screw and fasten theinternal thread 26 a of thelocknut 26 onto theexternal thread 11 c of theside gear 11. The taperedsurface 26 e of the threadedportion 26 b is pressed into the taperedsurface 20 c of thesleeve 20. - In this way, the
sleeve 20 can be integrally connected to theside gear 11 by screwing and fastening theinternal thread 20 a of thesleeve 20 onto theexternal thread 11 b of theside gear 11. Accordingly, ease of assembly is good. Also, since the above-described screwing and fastening brings the first and second sealing surfaces 11 d, 20 e of theside gear 11 and thesleeve 20 into tight contact with each other, a seal is made which shuts off communication between the inside of thedifferential case 2 and the screwed portion S between thetube portion 11 b and thesleeve 20. This eliminates the need for a seal member. Accordingly, liquid tightness between theside gear 11 and thesleeve 20 can be achieved by a simple structure. - Moreover, when the operating
portion 26 c is operated with a tool to insert thelocknut 26 into the annular recessedportion 20 b of thesleeve 20 from the outside in the axis direction and to screw and fasten thelocknut 26 onto the outer periphery of thetube portion 11 b of theside gear 11, and the taperedsurface 26 e of thelocknut 26 is pressed into the taperedsurface 20 c of the inner end portion of thesleeve 20 to lock thesleeve 20, a wedge effect of the taperedsurface 26 e of thelocknut 26 on the taperedsurface 20 c of the inner end portion of thesleeve 20 increases contact pressure between the oppositetapered surfaces side gear 11 and thesleeve 20. - The differential device D assembled as described above is incorporated into the transmission case 1, and
oil seals 25 are set between the outer end portions of thesleeves 20 and the transmission case 1. Then, lubricating oil is injected into the transmission case 1. Part of the lubricating oil flows into thedifferential case 2 through thework windows 18 to be used for lubrication between various portions of the differential gear mechanism 3. - Thus, the lubricating oil in the transmission case 1 is prevented from flowing out of the outer peripheries of the outer end portions of the
sleeves 20 by the oil seals 25, and the lubricating oil in thedifferential case 2 is prevented from flowing out of screwed portions S between the side gears 11 and thesleeves 20 by the tight contact between the first and second sealing surfaces 11 d, 20 e of the side gears 11 and thesleeves 20. This means that the lubricating oil in the transmission case 1 and thedifferential case 2 does not flow out even when thedrive shafts 7, 8 are removed from the side gears 11. - After the transmission case 1 housing the differential device D is mounted on an automobile, the left and
right drive shafts 7, 8 are fitted to the inner peripheries of the hubs 11 a of the corresponding side gears 11 via thesplines 29. - When the differential device D is activated, rotating torques of the side gears 11 are transmitted to the
drive shafts 7, 8 via thesplines 29. At this time, thesleeves 20 rotate together with the side gears 11, and the outer peripheral surfaces of thesleeves 20 are lubricated with the lubricating oil held in thelubrication grooves 21 of the first andsecond bearing bosses - Next, a second embodiment of the present invention shown in
FIG. 3 will be described. - In this second embodiment, the hub 11 a of the
side gear 11 is provided with an annular recessedportion 30 which surrounds the base of thetube portion 11 b. The recessedportion 30 has a tapered first sealingsurface 30 a formed on an inner peripheral surface thereof on a large-diameter side. Moreover, asecond sealing surface 20 f facing thefirst sealing surface 30 a is formed on an outer edge of an inner end of the protrudingportion 20 d of thesleeve 20. Except for the above-described points, the configuration of this embodiment is substantially the same as that of the previous embodiment. Accordingly, portions corresponding to those of the first embodiment are denoted by the same reference numerals inFIG. 3 , and explanations which have already been made in the first embodiment will be omitted. - According to this second embodiment, a wedge effect obtained by pressing the
second sealing surface 20 f of thesleeve 20 into thefirst sealing surface 30 a of theside gear 11 can increase contact pressure between the first and second sealing surfaces 30 a, 20 f and can improve sealability between the opposite sealing surfaces 30 a, 20 f. - Next, a third embodiment of the present invention shown in
FIG. 4 will be described. - In this third embodiment, an axis A of the tapered
surface 20 c of thesleeve 20 is matched with the axis X of each of the first andsecond bearing bosses surface 26 e of alocknut 26′ is decentered from the axis A by a certain amount e. Except for the above-described points, the configuration of this embodiment is similar to that of the second embodiment. Accordingly, portions corresponding to those of the second embodiment are denoted by the same reference numerals inFIG. 4 , and explanations which have already been made in the second embodiment will be omitted. - According to this third embodiment, when the
locknut 26′ is screwed and fastened onto thetube portion 11 b of theside gear 11 to press the taperedsurface 26 e of thelocknut 26′ into the taperedsurface 20 c of thesleeve 20, lateral pressure in such a direction that the amount e of decentering reduces is generated at contact surfaces of the oppositetapered surfaces tube portion 11 b and thelocknut 26′ on one side effectively increases, because the taperedsurface 26 e of thelocknut 26′ is decentered with respect to the taperedsurface 20 c of thesleeve 20 by the certain amount e. This can strengthen a locking function of thelocknut 26′ with respect to thetube portion 11 b and thesleeve 20, effectively prevent the looseness of the screwed portion S between thesleeve 20 and thetube portion 11 b, and maintain for a long time a state in which thefirst sealing surface 30 a of theside gear 11 and thesecond sealing surface 20 f of thesleeve 20 are in tight contact with each other. - It should be noted that in this third embodiment, a similar effect can also be obtained when the axis B of the tapered
surface 26 e of thelocknut 26′ is matched with the axis X of each of the first andsecond bearing bosses surface 20 c of thesleeve 20 is decentered from the axis B by the certain amount e. - The present invention is not limited to the above-described embodiments, but various design changes can be made without departing from the gist thereof. For example, the fastening of the ring gear 17 and the flange 15 with bolts may be replaced by joining by welding. Moreover, to prevent the lubricating oil in the
differential case 2 from flowing out into the hubs 11 a of the side gears 11, plugs may be press-fitted to the inner peripheries of the hubs 11 a in a liquid tight manner instead of the bottom portions 11 a 1 of the hubs 11 a.
Claims (4)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2014-034364 | 2014-02-25 | ||
JP2014034364A JP2015158256A (en) | 2014-02-25 | 2014-02-25 | Differential device |
Publications (2)
Publication Number | Publication Date |
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US9115796B1 US9115796B1 (en) | 2015-08-25 |
US20150240927A1 true US20150240927A1 (en) | 2015-08-27 |
Family
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US14/628,647 Expired - Fee Related US9115796B1 (en) | 2014-02-25 | 2015-02-23 | Differential device |
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US (1) | US9115796B1 (en) |
JP (1) | JP2015158256A (en) |
CN (1) | CN104864065A (en) |
DE (1) | DE102015203298A1 (en) |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP6487664B2 (en) * | 2014-10-22 | 2019-03-20 | 武蔵精密工業株式会社 | Differential |
JP6565524B2 (en) * | 2015-09-17 | 2019-08-28 | 株式会社ジェイテクト | Vehicle differential |
JP6178882B2 (en) * | 2015-10-23 | 2017-08-09 | 本田技研工業株式会社 | Power transmission device and vehicle equipped with the same |
DE102017107219A1 (en) * | 2016-04-07 | 2017-10-12 | Jtekt Corporation | differential device |
JP2020159443A (en) * | 2019-03-26 | 2020-10-01 | 武蔵精密工業株式会社 | Differential device |
JP7405523B2 (en) * | 2019-06-28 | 2023-12-26 | 武蔵精密工業株式会社 | transmission device |
CN110594394A (en) * | 2019-09-03 | 2019-12-20 | 精进电动科技股份有限公司 | Electric drive assembly of dry differential mechanism and new energy automobile |
KR20230101063A (en) * | 2021-12-29 | 2023-07-06 | 현대자동차주식회사 | Differential gear device for vehicle |
DE102022201875A1 (en) | 2022-02-23 | 2023-08-24 | Magna Pt B.V. & Co. Kg | Sealed side gear differential and assembly procedures |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3208306A (en) * | 1962-04-05 | 1965-09-28 | Robert P Lewis | Differential gearing |
US3673889A (en) * | 1971-11-10 | 1972-07-04 | Foote Foundry Co J B | Differential |
US3956945A (en) * | 1973-03-07 | 1976-05-18 | County Commercial Cars Limited | Driving transmissions for motor vehicles |
US4207780A (en) * | 1976-07-28 | 1980-06-17 | Rockwell International Corporation | Multi-speed planetary drive axle assembly |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3751488B2 (en) | 1999-11-17 | 2006-03-01 | 株式会社ユニバンス | Differential device for FF vehicle transmission |
JP5404727B2 (en) | 2011-09-28 | 2014-02-05 | ジヤトコ株式会社 | Seal structure with differential |
-
2014
- 2014-02-25 JP JP2014034364A patent/JP2015158256A/en active Pending
-
2015
- 2015-02-13 CN CN201510079319.2A patent/CN104864065A/en active Pending
- 2015-02-23 US US14/628,647 patent/US9115796B1/en not_active Expired - Fee Related
- 2015-02-24 DE DE102015203298.1A patent/DE102015203298A1/en not_active Withdrawn
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3208306A (en) * | 1962-04-05 | 1965-09-28 | Robert P Lewis | Differential gearing |
US3673889A (en) * | 1971-11-10 | 1972-07-04 | Foote Foundry Co J B | Differential |
US3956945A (en) * | 1973-03-07 | 1976-05-18 | County Commercial Cars Limited | Driving transmissions for motor vehicles |
US4207780A (en) * | 1976-07-28 | 1980-06-17 | Rockwell International Corporation | Multi-speed planetary drive axle assembly |
Also Published As
Publication number | Publication date |
---|---|
CN104864065A (en) | 2015-08-26 |
US9115796B1 (en) | 2015-08-25 |
JP2015158256A (en) | 2015-09-03 |
DE102015203298A1 (en) | 2015-08-27 |
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