JP2005009622A - Shaft supporting device, shaft rotating device and automobile vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To secure a space between bearings while properly adjusting and positioning each bearing. <P>SOLUTION: This bearing device 12 for journaling an output shaft 9 of a transmission 6 by the first and second bearings 14, 15 axially separated from each other, comprises a positioning part 14b1 projected from a face at a second bearing 15 side, of the first bearing 14, an approximately ring-shaped cotter member 17 kept into contact with the positioning part 14b1 at a radial outer side of the output shaft 9 and fitted to a recessed groove 9a formed on an outer peripheral face of the output shaft, and a lock nut 18 engaged with the output shaft 9, and kept into contact with a face at a side opposite to the second bearing 15, of the first bearing 14. The positioning and the pressure adjustment of the first bearing 14 are performed by the cotter member 17 and the lock nut 18. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a shaft support device including a first bearing and a second bearing provided at intervals in the axial direction, a shaft rotation device in which a shaft member is supported by the shaft support device, and the shaft rotation device. The present invention relates to an automobile vehicle included in a transmission.
[0002]
[Prior art]
In general, automobiles, airplanes, railway vehicles, machine tools, construction machines, etc., which rotate the shaft member by the driving force of the prime mover, etc., and the power is transmitted to the drive unit via the shaft member are widely used. Are known. In an automobile vehicle, the driving force of a prime mover is transmitted to driving wheels via shaft members such as an input shaft and an output shaft of a transmission, a propeller shaft, and an input shaft and an output shaft of a differential gear.
[0003]
As a shaft support device that rotatably supports such a shaft member, the shaft support device includes a first bearing and a second bearing that are arranged at intervals in the axial direction and in which an inner ring is fixed to the shaft member. The first bearing and the second bearing It is common to have a spacer member along the outer peripheral surface of the shaft member (see, for example, Patent Document 1). The spacer member is sandwiched between the first bearing and the second bearing. The pressure adjustment and positioning of each bearing is performed by tightening each bearing with a fastening member or the like with the spacer member sandwiched between the bearings.
[Patent Document 1]
Japanese Unexamined Patent Publication No. 2000-161466 (second page, FIG. 1)
[0005]
[Problems to be solved by the invention]
However, in the shaft support device, since it is necessary to provide a spacer member for adjusting and positioning the pressure of each bearing, there is a problem that it is necessary to secure a space corresponding to the spacer member and the device becomes large. . In particular, when another structure is disposed adjacent to the shaft support device, the shaft member and the structure cannot be brought close to each other, which is inconvenient in practical use.
[0006]
The present invention has been made in view of the above circumstances, and an object thereof is to provide a shaft support device capable of ensuring a space between the bearings while accurately adjusting and positioning the pressures of the bearings. Another object of the present invention is to provide a shaft rotating device in which a shaft member is supported by the shaft supporting device, and an automobile vehicle having the shaft rotating device in a transmission.
[0007]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, the invention according to claim 1 includes a first bearing and a second bearing which have a concentric outer ring and an inner ring which are rotatable with respect to each other and are provided apart from each other in the axial direction. In the shaft support device for fixing the outer ring of the first bearing and the second bearing to a bearing fixing member, fixing the inner ring to the shaft member, and rotatably supporting the shaft member, the first bearing And a positioning portion that protrudes from the surface on the second bearing side, abuts the positioning portion on the radially outer side of the shaft member, and fits into a recessed groove formed on the outer peripheral surface of the shaft member. A ring-shaped cotter member, and a fastening member that is screwed with the shaft member and abuts against a surface of the first bearing opposite to the second bearing.
[0008]
According to the first aspect of the present invention, the second bearing side of the first bearing is positioned by the cotter member, and the opposite side of the first bearing to the second bearing is positioned by the fastening member. The first bearing side of the second bearing is positioned by a bearing fixing member, and the opposite side of the second bearing to the first bearing is positioned by a shaft member or the like. That is, positioning of each bearing can be performed accurately without disposing a spacer member for positioning in contact with each bearing side as in the prior art on the radially outer side of the shaft member. Further, the pressure of each bearing can be adjusted accurately by adjusting the thickness of the shim of the bearing.
Accordingly, the space between the bearings can be ensured while accurately adjusting and positioning the bearings, and the apparatus can be reduced in size and can be prevented from interfering with other structures.
[0009]
According to a second aspect of the present invention, in the shaft support device according to the first aspect, the cotter member is composed of a plurality of divided members divided in the circumferential direction.
[0010]
According to the second aspect of the invention, in addition to the operation of the first aspect, since the cotter member is composed of a plurality of divided members, the assembly of the cotter member to the shaft member is easy and easy. Therefore, it is easy to avoid contact between the cotter member and surrounding parts during assembly, and the burden on the assembly operator can be reduced.
[0011]
According to a third aspect of the present invention, there is provided a shaft comprising the shaft support device according to the first or second aspect, and a substantially cylindrical shaft member to which the inner rings of the first bearing and the second bearing are fixed. In the rotating device, a space between the first bearing and the second bearing in the shaft member is formed narrower than a fixed portion of the inner ring.
[0012]
According to the third aspect of the present invention, the shaft member is formed thinly between the bearings, as well as the effects of the first or second aspect, so that a larger space between the bearings is ensured. This is effective in avoiding interference with other structures.
[0013]
According to a fourth aspect of the present invention, there is provided an automobile vehicle comprising the transmission having the shaft rotation device according to the third aspect and a structure adjacent to the shaft member of the shaft rotation device in the transmission. To do.
[0014]
According to the fourth aspect of the invention, not only the effect of the third aspect can be obtained, but also a space between the bearings in the transmission can be secured, and the structure adjacent to the shaft member is arranged close to the transmission. can do. Thereby, the circumference | surroundings of a transmission can be comprised more compactly and a design freedom improves greatly.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
1 to 4 show an embodiment of the present invention. FIG. 1 is an explanatory side view of an automobile, FIG. 2 is an explanatory side sectional view of a shaft rotating device, and FIG. 3 is an AA sectional view of FIG. FIG. 4 is an explanatory view when the cotter member is moved along the outer peripheral surface of the output shaft.
[0016]
As shown in FIG. 1, the automobile vehicle 1 is configured such that an engine 3 is arranged vertically in an engine room 2 defined in a front portion of the vehicle so that the direction of the crankshaft is front and rear. The automobile vehicle 1 is a so-called four-wheel drive vehicle, and the driving force of the engine 3 as a prime mover is transmitted to the front wheels and the rear wheels. In this automobile vehicle 1, a transmission 6 that shifts and transmits a driving force from the engine 3 is disposed in a floor tunnel portion 5 formed by projecting a floor panel 4 upward. The power output from the transmission 6 is distributed to the front wheels and the rear wheels via a transfer (not shown). In the present embodiment, since the engine 3 is placed vertically, the engine 3 and the transmission 6 are arranged side by side. In the present embodiment, an automatic transmission (AT) is used as the transmission 6. A steering gear box 7 is disposed below the transmission 6 as a structure extending in the left-right direction.
[0017]
In the present embodiment, the transmission 6 is an automatic type, and as shown in FIG. 1, an input shaft 8 to which power from the engine 3 is transmitted, an output shaft 9 to transmit power of the input shaft 8 rearward, A transmission mechanism 10 that shifts the rotation of the input shaft 8 and transmits it to the output shaft 9, and a case body 11 in which the input shaft 8, the output shaft 9, and the transmission mechanism 10 are accommodated.
[0018]
The transmission 6 includes a shaft support device 12 that rotatably supports a substantially columnar output shaft 9. That is, the shaft support device 12 and the output shaft 9 form a shaft rotation device 13. The shaft support device 12 includes a first bearing 14 and a second bearing 15 that are provided apart from each other in the axial direction. The first bearing 14 as the first bearing and the second bearing 15 as the second bearing rotate relative to the inner rings 14b and 15b and the outer rings 14c and 15c via rolling members 14a and 15a such as balls and rollers. Is configured to be acceptable. As shown in FIG. 2, the outer rings 14 c and 15 b are fixed to a bearing retainer 16 as a bearing fixing member, and the inner rings 14 b and 15 b are fixed to the output shaft 9.
[0019]
A positioning portion 14b1 protruding toward the second bearing 15 side is formed on the surface of the inner ring 14b of the first bearing 14 on the second bearing 15 side. The positioning portion 14b1 is formed with a receiving portion 14b2 for receiving the cotter member 17 that fits into the concave groove 9a of the input shaft 9. The concave groove 9a is formed in the circumferential direction on the second bearing 15 side at the position where the first bearing 14 on the outer peripheral surface of the input shaft 9 is fixed.
[0020]
As shown in FIG. 3, the cotter member 17 is formed in a substantially ring shape, and in this embodiment, the cotter member 17 is divided into a plate-like upper cotter 17 a and a lower cotter 17 b. In the present embodiment, the upper cotter 17a and the lower cotter 17b have a shape obtained by substantially dividing the cotter member 17 into two so as to be vertically symmetrical. As shown in FIG. 3, the upper cotter 17 a and the lower cotter 17 b are assembled to the input shaft 9 with their end portions having a predetermined gap.
[0021]
As shown in FIG. 3, the cotter member 17 is formed with substantially the same radial dimension over the circumferential direction. Further, the upper cotter 17a and the lower cotter 17b have inner peripheral edges 17a1 and 17b1 on the side in the circumferential direction formed in a cutout shape whose radial dimension decreases toward the end. In the present embodiment, the inner peripheral edges 17a1 and 17b1 on the end sides in the circumferential direction of the cotters 17a and 17b are formed by chamfering.
[0022]
In addition, a lock nut 18 that is screwed into the input shaft 9 is disposed on the side of the first bearing 14 opposite to the second bearing 15 of the inner ring 14b. That is, by tightening the lock nut 18 as a fastening member to the inner ring 14b side, the inner ring 14b is pinched by the cotter member 17 and the lock nut 18, and positioning and pressure adjustment of the first bearing 14 are performed.
[0023]
The second bearing 15 side of the outer ring 14 c in the first bearing 14 is in contact with the first wall surface 16 a of the bearing retainer 16. On the second bearing 15 side of the bearing retainer 16, a second wall surface 16 b is formed that contacts the surface of the outer ring 15 c of the second bearing 15 on the first bearing 14 side. That is, by tightening the lock nut 18, the fastening force is transmitted to the second bearing 15 via the first bearing 14 and the bearing retainer 16.
[0024]
Here, as shown in FIG. 2, the surface of the second bearing 15 opposite to the first bearing 14 of the inner ring 15 b comes into contact with the wall surface 9 b formed on the output shaft 9. As a result, the surface of the second bearing 15 opposite to the first bearing 14 is supported. As a result, when the lock nut 18 is tightened, the second bearing 15 is clamped by the bearing retainer 16 and the wall surface 9b of the output shaft 9. Is done.
[0025]
The bearing retainer 16 is formed such that a portion corresponding to each of the bearings 14 and 15 is recessed radially inward. Each of the aforementioned wall surfaces 16a and 16b is formed using this concave portion. In the present embodiment, a pair of front and rear seal members 19 provided to keep the bearing retainer 16 and the output shaft 9 airtight are disposed between the bearings 14 and 15. Each seal member 19 is formed in a ring shape and is in close contact with the output shaft 9 and the bearing retainer 16. Wall surfaces 16c and 16d for positioning the seal members 19 are formed on the bearing retainer 16. In the present embodiment, the bearing retainer 16 is disposed at the lower part of the transmission 6, and the lower side of the corresponding part between the bearings 14 and 15 forms a curved portion 16 e that is curved so as to be concave upward. Yes.
[0026]
Here, between the bearings 14 and 15 of the output shaft 9, a small diameter portion 9 c is formed that is thinner than the portion fixed to the bearings 14 and 15. As shown in FIG. 2, the curved portion 16 e of the bearing retainer 16 is disposed in a space generated by forming the output shaft 9 thin. A steering gear box 7 is disposed below the bending portion 16e at a predetermined interval.
[0027]
An assembly procedure on the first bearing 14 side of the shaft support device 12 configured as described above will be described.
[0028]
First, the second bearing 15 and the respective seal members 19 on the second bearing 15 side are assembled to the output shaft 9 and the bearing retainer 16. In this state, the upper cotter 17a and the lower cotter 17b are moved to the second bearing 15 side along the outer peripheral surface of the output shaft 9, and are fitted into the concave groove 9a.
[0029]
Here, when the upper cotter 17a and the lower cotter 17b are moved along the output shaft 9, as shown in FIG. 4A, the inner peripheral edges 17a1, 17b1 on the circumferential end side of the cotters 17a, 17b. Thus, the output shaft 9 is moved in parallel in the axial direction on the radially outer side of the output shaft 9 so as not to contact the outer peripheral surface of the output shaft 9. At this time, since the inner peripheral edges 17a1 and 17b1 of the cotters 17a and 17b are cut out, the cotters 17a and 17b are compared with those not formed as shown in FIG. 4B. As a whole, it can be moved parallel to the output shaft 9, and as a result, the trajectory drawn by the outer peripheral edges of the cotters 17 a and 17 b is also close to the output shaft 9. That is, as shown in FIG. 2, even if the gap between the bearing retainer 16 and the output shaft 9 is made small, the assembly of the cotter member 17 is not hindered.
[0030]
After the cotter member 17 is assembled to the output shaft 9 in this manner, the first bearing 14 is subsequently assembled, and the lock nut 18 is further tightened. Thereby, the second bearing 15 side of the first bearing 14 is positioned by the cotter member 17, and the opposite side of the first bearing 14 to the second bearing 15 is positioned by the lock nut 18. Further, the first bearing 14 side of the second bearing 15 is positioned by the bearing retainer 16, and the opposite side of the second bearing 15 from the first bearing 14 is positioned by the output shaft 9. That is, the positioning of the bearings 14 and 15 can be performed accurately without disposing a spacer member for positioning in contact with each bearing side on the radially outer side of the output shaft 9 as in the prior art. Further, by adjusting the shim thickness between the rolling member 14a of the bearing 14 and the positioning portion 14b1, the pressure of each of the bearings 14 and 15 can be accurately adjusted.
[0031]
Accordingly, the space between the bearings 14 and 15 can be ensured while accurately adjusting and positioning the pressures of the bearings 14 and 15, and the shaft support device 12 can be reduced in size and can be connected to other structures. Interference can be avoided.
[0032]
Further, according to the shaft support device 12 of the present embodiment, since the cotter member is composed of a plurality of divided members, the assembly of the cotter member to the shaft member is easy and easy. Therefore, it is easy to avoid contact between the cotter member and surrounding parts during assembly, and the burden on the assembly operator can be reduced.
[0033]
Further, according to the shaft rotating device 13 of the present embodiment, since the output shaft 9 is formed thinly between the bearings 14 and 15, a large space between the bearings 14 and 15 can be ensured. Accordingly, it is possible to form a curved portion 16e formed in a concave shape on the bearing retainer 16, and as a result, it is possible to effectively avoid interference with the steering gear box 7.
[0034]
Further, according to the automobile vehicle 1 of the present embodiment, a space between the bearings 14 and 15 in the transmission 6 can be ensured, and the steering gear box 7 adjacent to the output shaft 9 is arranged close to the transmission 6. be able to. Thereby, the circumference | surroundings of the transmission 6 can be comprised more compactly and a design freedom improves greatly.
That is, the area occupied by the transmission 6 and the steering gear box 7 disposed below the floor panel 4 can be reduced, and it is easy to ensure the ground clearance of each part. It is also possible to lower the center of gravity of the vehicle by lowering.
[0035]
In the embodiment, the output shaft 9 of the transmission 6 is supported by the shaft support device 12. However, the input shaft 8 may be supported by the shaft support device 12. Further, a propeller shaft, a drive shaft, an input / output shaft of a differential gear, and the like may be supported. Furthermore, the shaft support member 10 may of course support a shaft member such as an aircraft, a railway vehicle, a machine tool, or a construction machine instead of the automobile vehicle 1.
[0036]
In the above-described embodiment, the transmission 6 uses an automatic transmission (AT). However, the transmission 6 may be a manual transmission (MT), a continuously variable transmission (CVT), or the like. Of course. In addition, the structure in which the steering gear box 7 is disposed is shown as a structure adjacent to the shaft member of the transmission 6, but this is only an example, and this structure is, for example, a catalyzer, an exhaust pipe, or the like. Also good.
[0037]
Moreover, in the said embodiment, although what used the lock nut 18 as a fastening member was shown, you may use the volt | bolt etc. which screw-engage with the output shaft 9, and other concrete detailed structure. Of course, it can be appropriately changed.
[0038]
【The invention's effect】
As described above in detail, according to the first aspect of the present invention, the second bearing side of the first bearing is positioned by the cotter member, and the opposite side of the first bearing to the second bearing is positioned by the fastening member. Since it did in this way, positioning of each bearing can be performed exactly, without arrange | positioning the spacer member for positioning which contact | abuts to each bearing side like the prior art on the radial direction outer side of a shaft member. Further, the pressure adjustment of each bearing can be accurately performed by adjusting the shim thickness.
Accordingly, the space between the bearings can be ensured while accurately adjusting and positioning the bearings, and the apparatus can be reduced in size and can be prevented from interfering with other structures.
[0039]
According to the second aspect of the present invention, in addition to the effect of the first aspect, since the assembly of the cotter member to the shaft member is easy and easy, contact between the cotter member and the surrounding parts during assembly is avoided. It is easy to do, and the burden on the assembly operator can be reduced.
[0040]
In addition, according to the invention described in claim 3, since the shaft member is formed thinly between the bearings, the space between the bearings is further secured, as well as the effects of claim 1 or 2. This is effective in avoiding interference with other structures.
[0041]
Further, according to the invention described in claim 4, since the structure adjacent to the shaft member can be arranged close to the transmission as well as the effect of claim 3, the periphery of the transmission can be made more compact. The degree of freedom in design is greatly improved.
[Brief description of the drawings]
FIG. 1 is a side explanatory view of an automobile vehicle showing an embodiment of the present invention.
FIG. 2 is a side cross-sectional explanatory view of a shaft rotating device.
3 is a cross-sectional view taken along the line AA in FIG.
FIGS. 4A and 4B are explanatory views when the cotter member is moved along the outer peripheral surface of the output shaft, wherein FIG. 4A shows the cotter member having the shape according to the present embodiment, and FIG. This shows a cotter member whose inner peripheral edge is not formed in a notch shape.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Automobile vehicle 6 Transmission 7 Steering gear box 9 Output shaft 9a Concave groove 12 Shaft support device 13 Shaft rotation device 14 First bearing 14b Inner ring 14b1 Positioning part 14c Outer ring 15 Second bearing 15b Inner ring 15c Outer ring 16 Bearing retainer 17 Cotta member 17a Top Cotter 17b Lower cotter 18 Lock nut

Claims (4)

The first and second bearings have a first bearing and a second bearing, respectively, having concentric outer rings and inner rings that are rotatable with respect to each other and spaced apart in the axial direction. In a shaft support device that is fixed to a fixing member, the inner ring is fixed to a shaft member, and the shaft member is rotatably supported.
A positioning portion formed to project from the surface of the first bearing on the second bearing side;
A substantially ring-shaped cotter member that abuts the positioning portion on the radially outer side of the shaft member and fits into a groove formed on the outer peripheral surface of the shaft member;
A shaft support device comprising: a fastening member screwed to the shaft member and abutting against a surface of the first bearing opposite to the second bearing. The shaft support device according to claim 1, wherein the cotter member is constituted by a plurality of divided members divided in a circumferential direction. A shaft support device according to claim 1 or 2,
A shaft rotation device comprising: a substantially cylindrical shaft member to which the inner ring of the first bearing and the second bearing is fixed;
A shaft rotation device characterized in that a space between the first bearing and the second bearing in the shaft member is formed narrower than a fixed portion of the inner ring. A transmission having the shaft rotation device according to claim 3;
An automobile vehicle comprising: a shaft member of the shaft rotation device in the transmission; and an adjacent structure.

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