JP2007085476A - Spline coupling - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a spline coupling, which connects one rotating shaft 51 having a male spline part SP1 and second rotating shafts 41a, 42a, 50 having a female spline part SP2 engaged with the male spline part to transmit torque, and includes oil jacket parts 52a, 53 forming closed spaces S1, S2 communicating with the open end of a boundary surface between both spline parts SP1, SP2. <P>SOLUTION: In assembling the coupling, a gap between both spline parts SP1, PS2 is filled with a lubricant, and simultaneously the closed spaces S1, S2 in the oil jackets 52a, 53 are also filled with surplus lubricant, whereby even if the lubricant runs short, the lubricant is naturally supplied from the closed spaces S1, S2 in the oil jacket parts 52a, 53 to the boundary surface. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a spline joint in which one rotating shaft provided with a male spline portion and the other rotating shaft provided with a female spline portion meshing with the male spline portion are coupled so as to be able to transmit torque.

  As a document describing this type of spline joint, there is Patent Document 1 shown below as prior art document information related to the present invention. This patent document 1 relates to an invention of a rice transplanter including a self-propelled machine body having front and rear drive wheels driven by a driving force of an engine and a seedling planting device that can be moved up and down by a four-link mechanism.

  In the rice transplanter described in Patent Document 1, the output shaft of the engine is connected to one end of an input shaft of an HST (hydrostatic continuously variable transmission) disposed adjacent to one side surface of the transmission case via a transmission device. The output shaft of the HST is connected to the drive wheel via a gear transmission, and the other side surface of the transmission case is operated to raise and lower a power steering torque generator and a seedling planting device. A hydraulic pump for driving a hydraulic cylinder or the like is disposed adjacent to the hydraulic pump.

  The input shaft of the hydraulic pump obtains driving force from the extended end portion of the input shaft of the HST protruding from the opposite side of the HST toward the hydraulic pump side. The input shaft of the hydraulic pump and the input shaft of the HST are extended. The end portions are spaced apart from each other by a width dimension of the transmission case, and are thus connected to transmit torque via a rod-shaped intermediate joint member disposed in front of the transmission case.

  A spline joint is used between the input shaft of the HST and the intermediate joint member, and between the intermediate joint member and the input shaft of the hydraulic pump. The HST and the hydraulic pump use the transmission case as a hydraulic oil tank, but the intermediate joint members are arranged outside the transmission case, including the spline joints at both ends. Specifically, for example, a male sprocket portion is provided at the tip of the input shaft of the HST and the input shaft of the hydraulic pump, and a rod-like shape having a similar male sprocket portion at both ends is provided between these tips. An intermediate coupling member is provided, and further, an auxiliary coupling sleeve provided with female sprocket portions at both ends between the input shaft of the HST and the intermediate coupling member and between the intermediate coupling member and the input shaft of the hydraulic pump. Are connected so that torque can be transmitted. In order to suppress wear of the male and female sprockets due to torque transmission, a lubricant such as grease is filled in each boundary surface between the male spline part and the female spline part when the spline joint is assembled.

JP 2000-270621 A (paragraph numbers 0026 to 0030, FIGS. 4 and 5)

  However, in the spline joint described in Patent Document 1, the lubricant such as grease filled in the boundary surface of the male and female spline portions during assembly is gradually removed from the joint (auxiliary connection sleeve) based on long-term use. Since it slips out and becomes deficient, wear of the spline portion is likely to proceed. Moreover, in order to replenish the lubricant, a complicated operation of once disassembling the spline joint is required.

  Accordingly, an object of the present invention is to provide a spline joint in which wear hardly progresses by adopting a configuration in which a lubricant such as grease is difficult to come out in view of the above-described drawbacks of the spline joint according to the prior art exemplified above. Another object of the present invention is to provide a spline joint capable of replenishing lubricant without disassembling the spline joint.

A first characteristic configuration of the present invention is a spline in which one rotary shaft having a male spline portion and the other rotary shaft having a female spline portion meshing with the male spline portion are connected so as to be able to transmit torque. A joint,
An oil jacket that forms a sealed space communicating with the open end of the boundary surface between the two spline portions is provided.

  Therefore, in the spline joint according to the first characteristic configuration of the present invention, when the joint is assembled, the gap between the boundary surfaces of both spline portions is filled with a lubricant such as grease, and at the same time, an extra space is provided in the sealed space in the oil jacket. In addition, the lubricant can be filled in, and the lubricant does not escape from the oil jacket which is a sealed space. Therefore, even if the lubricant becomes deficient at the boundary surface between the two spline portions, there is an effect that the lubricant is naturally supplied from the sealed space in the oil jacket to the boundary surface through the open end.

  The second characteristic configuration of the present invention is that the oil jacket includes a nipple for filling the sealed space with a lubricant.

  With this configuration, even if the lubricant has run out of the joint due to unforeseen reasons, and even if the lubricant is insufficient in the oil jacket, by replenishing the lubricant from the nipple into the oil jacket, It can be used at least as soon as possible. Alternatively, even if the lubricant is insufficient at the interface between both splines due to the fact that the lubricant did not spread throughout the sealed space when the lubricant was initially filled, lubrication from the nipple into the oil jacket By replenishing the agent, the lubricant can be pushed out to the boundary surface between the two spline portions, and the lack of lubricant can be solved.

  According to a third characteristic configuration of the present invention, the oil jacket is a cylindrical jacket that is externally fitted and fixed to an outer periphery of a case member that externally fits the other rotation shaft, and the cylindrical jacket and the case member The sealing means for restricting the escape of the lubricant is interposed between them.

  With this configuration, the lubricant can be reliably prevented from slipping out from the boundary between the oil jacket and the case member by the elastic sealing means. Further, since the rotation of the oil jacket with the rotating shaft is prevented by fixing to the case member, the lubricant in the vicinity of the boundary surface between the two spline portions is caused by the centrifugal force accompanying the rotation of the rotating shaft, and the outer diameter direction of the oil jacket. It is possible to suppress inconveniences such as moving to

  According to a fourth characteristic configuration of the present invention, any one of the rotating shafts is an intermediate joint member that couples two rotating shafts separated from each other so that torque can be transmitted, and the intermediate joint member is externally fitted. A second oil jacket is provided that surrounds and forms a continuous sealed space communicating with the sealed space at an outer peripheral portion of the intermediate joint member.

  With this configuration, it is possible to fill a larger volume of lubricant as a spare lubricant by filling the second oil jacket with a lubricant when the joint is assembled. Become. Further, since the sealed spaces at both ends of the intermediate joint member are in communication with each other through the continuous sealed space formed by the second oil jacket, either one of the first oil jackets or the second oil jacket is provided. If one nipple is provided, all of the spline portions separated from the nipple along the axial direction can be replenished with the lubricant. Further, for example, when adopting a configuration in which the intermediate joint member and the rotation shaft are spline-connected by the sleeve-like auxiliary rotating body, the open end of the boundary surface of the spline portion is formed on both of the two end surfaces of the auxiliary rotating body. In this configuration, since these two open ends are both in communication with the continuous sealed space, the lubricant is surely prevented from coming out of the open end, and at the same time, Therefore, the lubricant can enter the boundary surface between the two spline portions.

  According to a fifth characteristic configuration of the present invention, the one rotary shaft includes the female spline portions at both ends in order to connect two rotary shafts separated from each other so that torque can be transmitted, and both the female shafts. The spline part is a hollow intermediate joint member communicating with each other.

  With this configuration, it is possible to fill a larger volume of lubricant as a spare lubricant by filling the hollow intermediate joint member with a lubricant when the joint is assembled. Become. In addition, since the boundary surfaces at both ends of the intermediate joint member are in communication with each other through the hollow portion in the intermediate joint member, if one nipple is provided on the side surface of the hollow intermediate joint member, The lubricant can be replenished to the boundary surfaces at both ends separated along the axial direction.

  According to a sixth characteristic configuration of the present invention, there is provided a second oil jacket that externally surrounds the intermediate joint member and forms a continuous sealed space communicating with the sealed space at an outer peripheral portion of the intermediate joint member. And a through hole is formed in the side surface of the intermediate joint member to communicate the hollow portion of the intermediate joint member with the continuous sealed space.

  With this configuration, it is possible to fill a larger volume of lubricant as a spare lubricant by filling the second oil jacket with the lubricant. Further, since the sealed spaces at both ends of the intermediate joint member are in communication with each other through the continuous sealed space formed by the second oil jacket, either one of the first oil jackets or the second oil jacket is provided. If one nipple is provided, all of the spline portions separated from the nipple along the axial direction can be replenished with the lubricant. In addition, since the lubricant filled from the second oil jacket in this way also reaches the hollow portion of the intermediate joint member through the through hole formed in the side surface of the intermediate joint member, the first oil Both ends of the intermediate joint member are passed through two completely opposite paths: a first inward path toward the boundary surface through the jacket and an outward second path toward the boundary surface through the hollow portion of the intermediate joint member. It becomes possible to efficiently replenish the boundary surface of the lubricant.

  A seventh characteristic configuration of the present invention is that a notch that forms a fracture surface extending in a radial direction is provided in a part of an end surface of the one rotating shaft.

  According to this configuration, the notch fracture surface formed on the end surface of the one rotating shaft acts to stir lubricant such as grease located in the first oil jacket according to the rotation of the rotating shaft. As a result, the lubricant can easily enter the boundary surface between the two spline portions, and the lack of lubricant can be effectively eliminated.

  According to an eighth characteristic configuration of the present invention, at least one of the fractured surfaces has a flange for scraping the lubricant in the sealed space radially inward in accordance with the rotation of the one rotation shaft with respect to the radial direction. It is in the point that makes a (rake) corner.

  If it is this structure, the notch fracture surface formed in the end surface of a rotating shaft not only stirs the lubricant located in a 1st oil jacket, but also scrubs the lubricant positively, Therefore, the lubricant is forced to enter the boundary surface between the two spline portions, and the lack of the lubricant is more effectively eliminated.

The best mode for carrying out the present invention will be described below with reference to the drawings.
FIG. 1 shows a rice transplanter as an example of a working machine using a spline joint according to the present invention.
This rice transplanter includes a riding-type self-propelled machine body 3 supported by a pair of left and right steering driving front wheels 1 and a pair of left and right driving rear wheels 2, and a planting device 4 is supported at the rear of the self-propelled machine body 3. Has been.
As shown in FIG. 2, the traveling engine 8 is mounted in the vicinity of the front end of the self-propelled aircraft 3 with the output shaft 8 a disposed laterally, and is installed in a mission case 10 disposed adjacent to the rear of the engine 8. The steering front wheel 1 is supported via a front axle case 9.

A boarding operation unit 13 disposed above the mission case 10 is provided with a steering wheel 14 and a seat 15 for operating the steering driving front wheel 1.
The planting device 4 includes a seedling platform 16, a planting mechanism 17 for taking out a unit amount of seedlings from the seedling platform 16 and planting the seedlings on a farm field, a grounding float 18 for leveling a planned farm field surface, and the like. These planting devices 4 are configured so as to be lifted and lowered via a four-link mechanism 5 driven by a hydraulic cylinder 6.

  As can be understood from FIG. 3 showing the hydraulic path, an HST (hydrostatic continuously variable transmission) 41 that can be switched forward and backward is disposed adjacent to the left and right sides of the mission case 10. The input shaft 41 a of the HST 41 is connected to the output shaft 8 a of the engine 8 via the winding transmission device 40. On the other hand, the output shaft 41b of the HST 41 is connected to the steering driving front wheel 1 and the driving rear wheel 2 via a gear-type transmission (not shown) in the mission case 10.

On the other hand, a hydraulic pump 42 is disposed adjacent to the left and right other sides of the mission case 10. The hydraulic pump 42 is used to drive the torque generator 43 for hydraulic power steering that assists the operation of the steering wheel 14 and the hydraulic cylinder 6 described above.
Further, the rear end 41a ′ of the input shaft 41a of the HST 41 penetrates the side surface opposite to the winding transmission device 40 of the HST 41 and is exposed to the front space of the transmission case 10, and is connected to the input shaft 42a of the hydraulic pump 42. It is arranged to share the core. As shown in FIG. 4, the rear end 41a 'of the input shaft 41a of the HST 41 and the front end of the input shaft 42a of the hydraulic pump 42 are spaced apart from each other, and a rod interposed between the two rotation shafts. The intermediate joint member 50 is connected so that torque can be transmitted.

Incidentally, the HST 41 and the hydraulic pump 42 use the mission case 10 as a hydraulic oil tank, and the oil in the mission case 10 is supplied to the HST 41 and the hydraulic pump 42 via the oil filter 45 disposed on the side surface of the mission case 10. Is done. The pressure oil from the hydraulic pump 42 is supplied to the torque generator 43 disposed above the mission case 10, and then supplied to the hydraulic cylinder 6 through the control valve 44.
On the other hand, the pressure oil supplied to the HST 41 is used to transmit the driving force obtained from the output shaft 8a of the engine 8 to the steering driving front wheel 1 and the driving rear wheel 2 by shifting with a hydrostatic pressure. The drain of the HST 41 is returned to the front axle case 9 communicating with the transmission case 10, and the drain of the control valve 44 when the hydraulic cylinder 6 is stopped is returned to the transmission case 10.

  As shown in FIG. 5, the rear end 41a 'of the input shaft 41a of the HST 41 and the input shaft 42a of the hydraulic pump 42 are formed with a male spline portion SP1 having the same cross-sectional shape, and between the two input shafts 41a and 42a. Male spline portions SP1 having the same cross-sectional shape are also formed at both ends of the intermediate joint member 50 interposed therebetween. The male spline portion SP1 formed on the input shaft 41a of the HST 41 and the male spline portion SP1 at one end of the intermediate joint member 50 include an auxiliary connecting sleeve provided with a female spline portion SP2 that externally meshes with both male spline portions SP1. 51 is connected to be able to transmit torque. Similarly, the male spline part SP1 at the other end of the intermediate joint member 50 and the male spline part SP1 formed on the input shaft 42a of the hydraulic pump 42 are also connected by an auxiliary joint 51 having the same shape so that torque can be transmitted.

A cover plate 52 (an example of a case member) surrounding the input shaft 42a is fixed to the opposite side of the mounting surface of the hydraulic pump 42 to the transmission case 10, and a cylindrical oil is disposed near the center of the cover plate 42C. A jacket portion 52a is projected. An oil seal L1 (an example of a sealing means) that seals the outer peripheral surface of the auxiliary connecting sleeve 51 so as to be relatively rotatable is attached to the inner peripheral surface of the oil jacket portion 52a. Therefore, the oil jacket portion 52a forms a sealed space S1 communicating with the open end of the boundary surface located between the male spline portion SP1 of the input shaft 42a of the hydraulic pump 42 and the female spline portion SP2 of the auxiliary connecting sleeve 51. is doing. When assembling the hydraulic pump 42, not only the gap space between the male and female spline portions SP1 and SP2, but also the sealed space S1 in the oil jacket portion 52a is filled with grease.
Further, in the annular groove 50a formed closer to the center than the male spline part SP1 of the intermediate joint member 50, in order to prevent the grease from coming out from the intermediate joint member 50 toward the HST 41 side, the auxiliary connecting sleeve 51 is provided. An O-ring R1 that seals between the inner peripheral surface and the intermediate joint member 50 is attached.

  On the other hand, a cylindrical oil jacket 53 surrounding the rear end 41a ′ is fixed to a boss 41B (an example of a case member) that externally supports the rear end 41a ′ of the input shaft 41a of the HST 41. An oil seal L2 (an example of a sealing unit) that seals the outer peripheral surface of the auxiliary connecting sleeve 51 so as to be relatively rotatable is attached to the inner peripheral surface near the tip of the oil jacket 53. Therefore, the oil jacket 53 forms a sealed space S2 that communicates with the open end of the interface located between the male spline part SP1 of the input shaft 41a of the HST 41 and the female spline part SP2 of the auxiliary connecting sleeve 51. . When the hydraulic pump 42 is assembled, not only the clearance space between the male and female spline parts but also the sealed space S2 in the oil jacket 53 is filled with grease. Again, in order to prevent the grease from slipping out from the intermediate joint member 50 toward the hydraulic pump 42 in the annular groove 50a formed closer to the center than the male spline portion SP1 of the intermediate joint member 50, the auxiliary connecting sleeve An O-ring R1 that seals between the inner peripheral surface of 51 and the intermediate joint member 50 is attached. An O-ring R2 that seals between the boss 41B and the oil jacket 53 is attached to the annular groove formed on the outer periphery of the boss 41B.

The oil jacket 53 is provided with a nipple 54 for replenishing grease in the sealed space S2 as necessary.
In addition, a part of the end surface accommodated in the sealed spaces S1 and S2 of the two auxiliary connection sleeves 51 is provided with a notch that forms a fracture surface 51f extending in the radial direction. Further, as shown in FIGS. 6 and 7, the fracture surface 51f scrapes the grease in the sealed spaces S1 and S2 inward in the radial direction in accordance with the rotation of the auxiliary connecting sleeve 51, and the male and female spline portions SP1 and SP2 In order to feed the gap toward the gap, a large angle θ is formed with respect to the radial direction.

[Another embodiment]
<1> FIG. 8 shows a second embodiment obtained by modifying the embodiment shown in FIG. In this embodiment, a continuous sealed space S3 that surrounds the entire outer peripheral portion of the intermediate joint member 50 and the most inner part of each auxiliary connecting sleeve 51 and communicates with both sealed spaces S1 and S2 is defined as an intermediate joint member. A secondary oil jacket 55 (an example of a second oil jacket) formed at 50 outer peripheral portions is provided.
The secondary oil jacket 55 is a long cylindrical member, and is fixedly supported on the oil jacket portion 52a of the cover plate 52 and the inner peripheral surfaces of the oil jacket 53 via large-diameter flange portions at both ends thereof. Yes. The annular grooves 55a and 55b formed in the large-diameter flange portions seal the oil jacket portion 52a of the cover plate 52 and the inner peripheral surface of the oil jacket 53 and the secondary oil jacket 55, respectively. O-rings R3 and R4 are attached. Here, since both the sealed spaces S1 and S2 communicate with each other via the continuous sealed space S3, not only the sealed space S2 but also the continuous sealed space S3 and the like via the nipple 54 provided in the oil jacket 53. The sealed space S1 can be replenished with insufficient grease.
In this embodiment, in order to feed the grease in the sealed spaces S1, S2, S3 toward the gap between the male and female spline portions SP1, SP2 according to the rotation of the auxiliary connecting sleeve 51, the fracture surface 51f extending in the radial direction is formed. Notches to be formed are formed at both ends of each auxiliary connecting sleeve 51.

<2> On the other hand, in the third embodiment shown in FIG. 9, the male spline part SP1 formed on the rear end 41a ′ of the input shaft 41a of the HST 41 and the male spline part SP1 formed on the input shaft 42a of the hydraulic pump 42 Are connected so that torque can be transmitted by the intermediate connecting sleeve 60 having the female spline portions SP2 at both ends without using the auxiliary connecting sleeve.
An oil jacket portion 52a that forms a sealed space S1 is provided on the input shaft 42a side of the hydraulic pump 42, and oil that forms a sealed space S2 on the rear end 41a ′ side of the input shaft 41a of the HST 41 is provided. The point in which the jacket 53 is provided is the same as that of embodiment of FIG. However, the oil seals L1 and L2 attached to the inner peripheral surfaces of the oil jacket portion 52a and the oil jacket 53 seal the outer peripheral surface of the intermediate coupling sleeve 60 so as to be relatively rotatable.

The intermediate connecting sleeve 60 is hollow over its entire length, and both female spline portions SP2 communicate with each other through this hollow portion. Therefore, when the intermediate coupling sleeve 60 is assembled, not only the sealed spaces S1, S2 at both ends but also the sealed space S4 formed in the hollow portion can be filled with a relatively large amount of grease. When the grease is almost insufficient at the boundary between the spline portions SP1 and SP2, the grease is naturally supplied not only from the sealed spaces S1 and S2 at both ends but also from the sealed space S4 side of the intermediate connecting sleeve 60.
In this embodiment, in order to feed the grease in the sealed spaces S1 and S2 toward the gap between the male and female spline portions in accordance with the rotation of the intermediate connecting sleeve 60, the notch that forms the fracture surface 61f extending in the radial direction is The intermediate connection sleeve 60 is formed at both ends.

<3> Further, FIG. 10 shows a fourth embodiment obtained by further modifying the third embodiment. In this embodiment, the male spline part SP1 formed on the rear end 41a ′ of the input shaft 41a of the HST 41 and the male spline part SP1 formed on the input shaft 42a of the hydraulic pump 42 are the same as the intermediate connection sleeve 60 in FIG. A similar intermediate connection sleeve 61 is connected so that torque can be transmitted. Then, a secondary oil jacket 65 (a second oil jacket 65) that surrounds the entire outer peripheral portion of the intermediate connection sleeve 61 and forms a continuous sealed space S5 that communicates with both the sealed spaces S1 and S2 at the outer peripheral portion of the intermediate connection sleeve 61. An example of an oil jacket is provided.

The secondary oil jacket 65 is a long cylindrical member, and is fixedly supported on the oil jacket portion 52a of the cover plate 52 and the inner peripheral surfaces of the oil jacket 53 via large-diameter flange portions at both ends thereof. Yes. An annular groove 55a formed in each large-diameter flange portion seals between the oil jacket portion 52a of the cover plate 52 and each inner peripheral surface of the oil jacket 53 and the secondary oil jacket 65. O-ring R3 is attached. Here, since both the sealed spaces S1 and S2 communicate with each other via the continuous sealed space S4, the continuous sealed space S5 and the sealed space S1 are connected to each other via the nipple 54 disposed adjacent to the one sealed space S2. Even the missing grease can be replenished.
Further, a through hole 61a is formed on the side surface of the intermediate connecting sleeve 61 to communicate the internal sealed space S4 with the outer sealed space S5. Therefore, the insufficient grease can be replenished not only to the continuous sealed space S5 and the sealed space S1 but also to the sealed space S4 through the nipple 54 provided in the oil jacket 53.
If the through hole 61a is inclined so that the axis of the through hole 61a forms an angle with respect to the radial direction, or if a projection having an angle is formed on the outer peripheral edge of the through hole 61a, the intermediate coupling sleeve 61 is provided. More preferably, the grease in the continuous sealed space S <b> 5 is fed into the sealed space S <b> 4 in the intermediate connecting sleeve 61 in accordance with the rotation of the rotation.

<4> As a notch for urging the grease in the sealed spaces S1, S2 to move to the gap between the male and female spline portions SP1, SP2, in addition to the forms shown in FIGS. 6 and 7, FIG. As shown, the auxiliary connecting sleeve 51 or the intermediate connecting sleeves 60, 61 may be formed as a groove 71 having a fracture surface 71f formed in the end face and extending in the radial direction. Here, in order to scrape the grease in the sealed spaces S1 and S2 inward in the radial direction according to the rotation of the auxiliary connecting sleeve 51 and the like and feed it toward the gap between the male and female splines, The ugly angle θ is formed.

The side view which shows the rice transplanter using the spline coupling by this invention The front view which shows the principal part of the rice transplanter of FIG. Hydraulic path diagram of rice transplanter in Fig. 1 The bottom view which shows the principal part of the rice transplanter of FIG. The fracture | rupture front view which shows embodiment of the spline coupling by this invention Partially broken side view showing notches provided on the end face of the rotating shaft The perspective view which shows the notch provided in the end surface of a rotating shaft Broken front view showing a spline joint according to a second embodiment Broken front view showing a spline joint according to a third embodiment Breaking front view showing a main part of a spline joint according to a fourth embodiment The partially broken side view which shows another embodiment of the notch provided in the end surface of a rotating shaft

Explanation of symbols

41a HST input shaft (rotary shaft)
41B Boss part (case member)
42a Pump input shaft (rotary shaft)
50 Intermediate joint member (Rotating shaft)
51 Auxiliary joint (rotating shaft)
51f Broken surface 52 Cover plate (case member)
52a Oil jacket 53 Oil jacket 54 Nipple 55, 65 Secondary oil jacket (second oil jacket)
60, 61 Intermediate connecting sleeve (rotating shaft)
SP1 Male spline part SP2 Female spline part S1, S2, S3, S4, S5 Sealed space L1, L2 Oil seal (sealing means)

Claims (8)

A spline joint in which one rotating shaft provided with a male spline part and the other rotating shaft provided with a female spline part meshing with the male spline part are connected so as to be able to transmit torque,
A spline joint comprising an oil jacket that forms a sealed space communicating with an open end of a boundary surface between both spline portions.   The spline joint according to claim 1, wherein the oil jacket includes a nipple for filling the sealed space with a lubricant.   The oil jacket is a cylindrical jacket that is externally fitted and fixed to an outer periphery of a case member that externally fits the other rotating shaft, and a seal that restricts the lubricant from coming out between the cylindrical jacket and the case member. The spline joint according to claim 1 or 2, wherein means are interposed.   Any one of the rotating shafts is an intermediate joint member that connects two rotating shafts separated from each other so as to be able to transmit torque, and surrounds the intermediate joint member and communicates with the sealed space. 4. The spline joint according to claim 1, further comprising a second oil jacket that forms a continuous sealed space at an outer peripheral portion of the intermediate joint member. 5.   The one rotary shaft has a hollow intermediate joint provided with both female spline portions at both ends thereof, in order to connect two rotary shafts separated from each other so as to transmit torque. The spline joint according to any one of claims 1 to 3, wherein the spline joint is a member.   A second oil jacket that surrounds the intermediate joint member and forms a continuous sealed space in communication with the sealed space at an outer peripheral portion of the intermediate joint member; and the intermediate joint member 6. The spline joint according to claim 5, wherein a through-hole is formed on a side surface of the intermediate joint member so as to communicate the hollow portion of the intermediate joint member with the continuous sealed space.   The spline joint according to any one of claims 1 to 6, wherein a notch that forms a fracture surface extending in a radial direction is provided in a part of an end surface of the one rotary shaft.   At least one of the fracture surfaces has a rake angle for scraping the lubricant in the sealed space radially inward in accordance with the rotation of the one rotation shaft with respect to the radial direction. The spline joint according to claim 7.

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