JP4150176B2 - Propeller shaft structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a propeller shaft structure provided with a universal joint, which is suitable for use in power transmission from a prime mover to wheels in a vehicle such as a speed sprayer.
[0002]
[Prior art]
A propeller shaft is used to transmit power from a prime mover to wheels in a vehicle such as a speed sprayer or a tractor.
In general, there is no design deviation between the input and output shafts, and both shafts are held by a single housing and the shaft end distance is short. However, even when the shaft end distance is short, for example, when one shaft is a frame rigid and the other shaft is a floating mount made of anti-vibration rubber, it is compact and has a large allowable shaft misalignment. Is required.
[0003]
[Problems to be solved by the invention]
However, in a propeller shaft structure with a conventional universal joint, the shaft end distance, for example, between the output shaft (propeller shaft input shaft) side of the transmission and the input shaft (propeller shaft output shaft) on the axle (difference) side. When the distance is particularly short, a universal joint could not be applied.
In addition, joints other than universal joints (gear couplings, rubber couplings, disk couplings, etc.) cannot meet the required cost, detachability, misalignment and other tolerances, and strong power transmission. Not suitable for.
[0004]
The present invention has been made to solve the problems as described above, and the object of the present invention is to reduce the axial length as much as possible, and for the joint of eccentricity, deflection angle, end play and so on. An object of the present invention is to provide a propeller shaft structure that can absorb all of the three disadvantageous misalignment elements and that is easy to attach to and detach from the input / output shaft, and that is easy to assemble and maintain.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, a propeller shaft structure according to the present invention basically includes a universal joint that transmits rotational power between an input shaft and an output shaft arranged at a predetermined distance, The universal joint includes a first cross joint having a first plate-like portion, and a second cross joint having a second plate-like portion and a third plate-like portion, and the first plate-like portion and The second disk-shaped part is connected to each other, and a pocket hole is formed in at least one of the first to third disk-shaped parts.
[0006]
In this case, the first cross joint is connected to a first cross shaft including a first X axis and a first Y axis orthogonal to each other, and one of the input shaft and the output shaft so as to be integrally rotatable. A hub with a hub comprising a hub and a first X-axis yoke portion that rotatably supports the first X-axis, a first Y-axis yoke portion that rotatably supports the first Y-axis, and the first disc shape And a first flange yoke composed of a portion.
[0007]
The second cross joint includes a second cross axis composed of a second X axis and a second Y axis orthogonal to each other, a second Y axis yoke portion that rotatably supports the second Y axis, and the first cross axis. A second flange yoke composed of two disk-shaped parts, a second X-axis yoke part rotatably supporting the second X-axis and a third flange yoke composed of the third disk-shaped part, the input shaft and the output A second hub connected to the other of the shafts so as to be integrally rotatable, and a flange with a hub made of a fourth plate-like portion connected to the third plate-like portion.
[0008]
Further, as a specific aspect of the propeller shaft structure of the present invention, the first X-axis yoke portion is loosely inserted into the first pocket hole, and the second X-axis yoke portion is loosely inserted into the second pocket hole. In addition, the second Y-axis yoke portion is loosely inserted into the third pocket hole.
[0009]
Furthermore, in another preferred aspect of the propeller shaft structure of the present invention, the input shaft and the output shaft, and the first hub and the second hub are coupled so as to be integrally rotatable by spline fitting.
In still another preferred aspect, the first flange yoke and the second flange yoke, and the third flange yoke and the flange with hub are detachably connected to each other by a fixing member.
[0010]
In a preferred aspect of the propeller shaft structure according to the present invention configured as described above, the first X-axis yoke portion of the first cross shaft is provided on each of the plate-like portions of the first, second, and third flange yokes. Since the second X-axis yoke portion and the second Y-axis yoke portion are pocket-inserted, the yoke portion is a plate-like portion of the flange yoke even if each yoke portion is inclined and the propeller shaft is refracted. Since the tip end side of the yoke portion is loosely inserted into the pocket hole, the axial length can be reduced accordingly. Therefore, the present invention can be applied even when the shaft end distance of the input / output shaft is set short.
[0011]
In addition, since two cross joints are used and the input shaft and output shaft are connected by spline fitting, the two cross joints can be slid in the axial direction, so that eccentricity, declination, It can absorb all three misalignment elements of end play that are inconvenient for the joint.
[0012]
Furthermore, the two cross joints are connected to the input shaft and the output shaft by spline fitting, and the first flange yoke and the second flange yoke, and the third flange yoke and the flange with the hub are for fixing bolts or the like, respectively. Since the members are detachably connected to each other, the propeller shaft of the present invention can be easily disassembled and attached even if the input shaft and the output shaft are already fixed. Therefore, the assembly and maintenance of the axle are improved.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
1 is a partially cutaway side view showing an embodiment of a propeller shaft structure according to the present invention, FIG. 2 is an enlarged sectional view of the propeller shaft portion of FIG. 1, and FIG. 3 is an exploded perspective view of the propeller shaft portion of FIG. .
[0014]
The propeller shaft structure 1 according to the present embodiment includes a universal joint 5 including a first cross joint 10 and a second cross joint 20. For example, a speed change of a speed sprayer in a power transmission path from a prime mover (not shown). It is applied between the output shaft (propeller shaft input shaft 4) of the machine 3 and the input shaft (propeller shaft output shaft 6) on the axle side (diff 7). In this case, the shaft end distance L between the input shaft 4 and the output shaft 6 is set to be considerably short (for example, about 145 mm) due to the demand for shortening the vehicle longitudinal dimension (vehicle length shortening). Propeller shafts with joints are not applicable.
[0015]
The first cross joint 10 is a first cross composed of a first X axis 15a and a first Y axis 15b orthogonal to each other, as can be understood by referring to FIG. 4, in addition to FIGS. A hub-equipped yoke comprising a shaft 15, a first hub 12 connected to the input shaft 4 so as to be integrally rotatable, and a U-shaped first X-axis yoke portion 13 which rotatably supports the first X-axis 15a. 11 and a first flange yoke 16 composed of a first Y-axis yoke portion 17 and a first plate-like portion 18 that rotatably support the first Y-axis 15b.
[0016]
The input shaft 4 is formed with a spline shaft end 4a, and the first hub 12 is formed with a spline receiving portion 12a. The input shaft 4 and the hub-equipped yoke 11 (the first hub 12) are These are connected so as to be slidable in the axial direction by spline fitting and to be integrally rotatable.
[0017]
Both ends of the first X-axis 15a and the first Y-axis 15b of the first cross shaft 15 are a pair of mounting holes 13a formed in the first X-axis yoke portion 13 and the first Y-axis yoke portion 17. , 13a, 17a, and 17a are rotatably supported by needle bearings 44, 44,.
A rectangular first pocket hole 19 that is long along the first X axis 15a direction is formed in the central portion of the first disk-shaped part 18 and into which the first X axis yoke part 13 is loosely inserted. Yes.
[0018]
On the other hand, the second cross joint 20 has a second X axis 25a and a second Y axis 25b which are orthogonal to each other, as can be understood by referring to FIGS. 5 and 6 in addition to FIGS. A second cross shaft 25, a second Y-axis yoke portion 22 that rotatably supports the second Y-axis 25 b, and a second disc-like portion 23 connected to the first disc-like portion 18. The flange yoke 21, the third flange yoke 31 including the second X-axis yoke portion 32 and the third disc-like portion 33 that rotatably supports the second X-axis 25 a, and the spline shaft end portion 6 a of the output shaft 6. A flange with a hub comprising a second hub 37 and a fourth plate portion 38 connected to the third plate portion 33 so as to be axially slidable and coupled so as to be integrally rotatable. 36.
[0019]
Both ends of the second X axis 25 a and the second Y axis 25 b of the second cross shaft 25 are a pair of mounting holes formed in the second X axis yoke portion 32 and the second Y axis yoke portion 22. 32a, 32a, 22a, and 22a are rotatably supported by needle bearings 44, 44,.
[0020]
The first plate-like portion 18 of the first flange yoke 16 has four bolt insertion holes 41 formed at intervals of 90 degrees, and the second plate-like portion 23 of the second flange yoke 21 has A female screw portion 42 is formed at a position corresponding to the bolt insertion hole 41 of the first plate-like portion 18, and a bolt 40 is screwed into the female screw portion 42 as a fixing member from the first plate-like portion 18 side. The first flange yoke 16 and the second flange yoke 21 are integrally and detachably connected by screwing. In addition, crescent-shaped fitting protrusions 18a and 18a are provided above and below the long side of the first pocket hole 19 in the first plate-like portion 18, and the second plate-like portion 23 is provided with the above-mentioned Fitting recesses 23a and 23a into which the fitting protrusions 18a and 18a are fitted are provided to prevent mutual displacement.
[0021]
Similar to the first pocket hole 19, the second X-axis yoke portion 32 is loosely inserted in the center of the second disk-shaped portion 23, and is long and rectangular along the second X-axis 25a direction. The second pocket hole 24 is formed, and the second disc-shaped portion 33 is inserted into the second Y-axis yoke portion 22 in a loose and long rectangular shape along the second Y-axis 25b direction. A third pocket hole 34 is formed.
[0022]
The third and fourth plate-like portions 33 and 38 of the third flange yoke 31 and the hub-equipped flange 36 are formed with four bolt insertion holes 47 and 48 at intervals of 90 degrees. The bolt insertion holes 47, 48 are bolts 45, which are fixing members, inserted from the side of the fourth plate-like portion 38, and nuts 46, which are fixing members screwed to the tip side thereof, and the third and fourth plates. The shape portions 33 and 38 are integrally and detachably connected by screwing. In addition, crescent-shaped fitting convex portions 33a and 33a protrude from the left and right sides of the long side of the third pocket hole 34 in the third disc-shaped portion 33, and the fourth disc-shaped portion 38 has the above-mentioned Fitting recesses 38a and 38a into which the fitting protrusions 33a and 33a are fitted are provided to prevent mutual displacement.
[0023]
The output shaft 6 is formed with the spline shaft end portion 6a, the second hub 37 is formed with a spline receiving portion 37a, and the output shaft 6 and the hub-equipped flange 36 (second hub 37 thereof) Are connected so as to be slidable in the axial direction by spline fitting and to be integrally rotatable. Further, as shown in FIG. 2, an axial position adjusting bolt in which a locking plate 52 for restricting the position of the flange 36 with hub is loosely fitted to the spline shaft end portion 6a of the output shaft 6. 51 is screwed together.
[0024]
In the propeller shaft structure 1 of the present embodiment having such a configuration, the first X, second, and third flange yokes 16, 21, 31 have the first X Since the pocket holes 19, 24, and 34 into which the shaft yoke portion 13, the second X-axis yoke portion 22, and the second Y-axis yoke portion 32 are loosely inserted are formed, the yoke portions 13, 22, and 32 are inclined to be propellers. Even if the shaft (universal joint 5) is refracted, the yoke parts 13, 22, and 32 do not interfere with the disk-like parts 18, 23, and 33 of the flange yokes 16, 21, and 31, and the tips of the yoke parts 13, 23, and 33 Since the side is loosely inserted into the pocket holes 19, 24, 34, the axial length (shaft end distance L) can be shortened accordingly. Therefore, the present invention can be applied even when the shaft end distance of the input / output shaft is set short.
[0025]
Further, since the two cross joints 10 and 20 are used and the input shaft 4 and the output shaft 6 are connected by spline fitting, the two cross joints 10 and 20 can be slid in the axial direction. Therefore, it is possible to absorb all three misalignment elements which are inconvenient for the joint, such as eccentricity, declination and end play.
[0026]
Further, the two cross joints 10, 20 and the input shaft 4 and the output shaft 6 are connected by spline fitting, and the first flange yoke 16, the second flange yoke 21, the third flange yoke 31, and the hub flange 36 are connected. Are detachably connected with bolts 40, 45, 46, respectively, so that even if the input shaft 4 and the output shaft 6 are already fixed, the propeller shaft structure 1 of the present invention can be easily disassembled and detached. Axle assembly and maintenance are improved.
[0027]
Although one embodiment of the present invention has been described in detail above, the present invention is not limited to the above-described embodiment, and various designs can be used without departing from the spirit of the invention described in the claims. Can be changed.
[0028]
【The invention's effect】
As can be understood from the above description, according to the present invention, the axial length can be shortened as much as possible, and all three elements that are inconvenient for the joint of eccentricity, declination, and end play misalignment are absorbed. In addition, it is possible to provide a propeller shaft structure that can be easily attached to and detached from the input / output shaft and has good axle assembly and maintenance.
[Brief description of the drawings]
FIG. 1 is a partially cutaway side view showing an embodiment of a propeller shaft structure according to the present invention.
FIG. 2 is an enlarged cross-sectional view of the propeller shaft portion of FIG.
3 is an exploded perspective view showing a propeller shaft portion of FIG. 1. FIG.
4 is a partially cutaway perspective view of the first cross joint portion of FIG. 2 as viewed obliquely from the upper right.
5 is a partially cutaway perspective view of the second cross joint portion (excluding a flange with a hub) in FIG.
6 is a partially cutaway perspective view of the second cross joint portion (excluding the flange with a hub) in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Propeller shaft structure 4 ... Input shaft 5 ... Universal joint 6 ... Output shaft 10 ... First cross joint 11 ... Yoke 12 with hub ... First hub 13 ... First X-axis yoke 15 ... first cross shaft 15a ... first X-axis 15b ... first Y-axis 16 ... first flange yoke 17 ... first Y-axis yoke 18 ... 1st plate-like part 19 ... 1st pocket hole 20 ... 2nd cross joint 21 ... 2nd flange yoke 22 ... 2nd Y-axis yoke part 23 ... 2nd board shape Portion 24 ... Second pocket hole 25 ... Second cross shaft 25a ... Second X axis 25b ... Second Y axis 31 ... Third flange yoke 32 ... Second X axis yoke Part 33 ... Third disc part 34 ... Third pocket hole 36 ... Flange 37 with hub ... Second hub 38 ... fourth plate-shaped portion 40, 45, and 46 ... bolts (fixing member)

Claims (3)

A universal joint (5) for transmitting rotational power between the input shaft (4) and the output shaft (6) arranged at a predetermined distance is provided, and the universal joint (5) is a first plate-like portion. A first cross joint (10) having (18) and a second cross joint (20) having a second disk-like part (23) and a third disk-like part (33), A propeller shaft structure in which one plate-like portion (18) and the second plate-like portion (23) are connected, wherein the first to third plate-like portions (18), (23), (33 ) Are formed with pocket holes (19), (24), (34) ,
The first cross joint (10) includes a first cross shaft (15) including a first X axis (15a) and a first Y axis (15b) orthogonal to each other, the input shaft (4), and the output shaft. (6) A hub-attached yoke comprising a first hub (12) connected to one of the first X-axis yoke portion (13) and a first X-axis yoke portion (13) rotatably supporting the first X-axis (15a). 11) and a first flange yoke (16) comprising a first Y-axis yoke portion (17) and a first plate-like portion (18) for rotatably supporting the first Y-axis (15b). ,
The second cross joint (20) rotates a second cross axis (25) composed of a second X axis (25a) and a second Y axis (25b) orthogonal to each other, and the second Y axis (25b). A second flange yoke (21) composed of a second Y-axis yoke portion (22) and a second plate-like portion (23) that are freely supported, and a second X-axis (25a) that rotatably supports the second X-axis (25a). A third flange yoke (31) composed of an X-axis yoke portion (32) and the third disc-like portion (33) and the other of the input shaft (4) and the output shaft (6) are connected to be rotatable together. A hub-attached flange (36) comprising a second hub (37) and a fourth disc-like portion (38) connected to the third disc-like portion (33),
The first X-axis yoke portion (13) is loosely inserted into the first pocket hole (19), the second X-axis yoke portion (32) is loosely inserted into the second pocket hole (24), and The propeller shaft structure , wherein the second Y-axis yoke portion (22) is loosely inserted into the third pocket hole (34) . The input shaft (4) and the output shaft (6) are connected to the first hub (12) and the second hub (37) so as to be integrally rotatable by spline fitting. The propeller shaft structure according to claim 1 . The first flange yoke (16), the second flange yoke (21), the third flange yoke (31) and the flange with hub (36) can be attached and detached by fixing members (40, 45, 46), respectively. propeller shaft structure according to claim 1 or 2, characterized in that it is connected to.

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