JP5285570B2 - Support member for seal member - Google Patents

Description

  The present invention provides a sealing member comprising a cylindrical member having a shaft hole portion through which a transmission shaft is inserted and a concave portion for a sealing member for holding a sealing member in contact with the outer peripheral portion of the transmission shaft. The present invention relates to a support member.

  Such a support member is used to support the seal member. For example, as shown in FIG. 6, the transmission shaft 13 is inserted into the shaft hole 22, and the seal member 52 is inserted into the seal member recess 53 from one end surface 51 a of the cylindrical support member 51, so that the seal member recess 53 holds the seal member 52. For example, by attaching the cylindrical cover 18 that surrounds the transmission shaft 13 to the support member 51, it is possible to prevent dirt and mud scattered around by the tires and the like from traveling to the transmission shaft 13 when the vehicle is traveling. At this time, when the seal member 52 contacts and seals with the outer peripheral portion 13 a of the transmission shaft 13, it is possible to prevent dirt and mud from entering the space surrounded by the cover 18, the transmission shaft 13 and the seal member 52.

  Conventionally, this type of support member 51 is made of metal, and one side surface 52a of the seal member 52 (the right side surface in FIG. 6) is exposed to the outside (see FIG. 6).

  In the conventional support member, one side surface of the seal member is exposed to the outside. For this reason, the seal member is easily deteriorated by being exposed to wind and rain or ultraviolet rays, and it may be difficult to maintain the seal performance of the seal member for a long period of time. In addition, since the shaft hole portion and the concave portion for the seal member are formed in the support member by cutting, the processing cost is increased. Further, the support member may be rusted by long-term use, and the support member may adhere to other members.

  An object of the present invention is to provide a support member that can reduce the cost and prevent sticking while maintaining the sealing performance of the seal member over a long period of time.

A first characteristic configuration of the support member for a seal member of the present invention is a recess for a seal member for holding a shaft hole portion through which the transmission shaft is inserted and a seal member that contacts the outer peripheral portion of the transmission shaft. And the cylindrical member is made of synthetic resin, the seal member recess is opened toward one end surface along the axial hole portion of the cylindrical member, and the seal is formed. A member is configured to be insertable into the seal member recess from one end surface of the cylindrical member, and the seal member recess is inserted from one end surface of the cylindrical member in a state where the seal member is inserted into the seal member recess. comprises a ring-shaped lid member having a width in the axial direction of the insertable said cylindrical member toward the insert the lid member Ri configuration tare a synthetic resin, the seal member to the seal member recess And said A gap for grease storage is formed between the sealing member and the lid member in the axial direction of the cylindrical member in a state where the lid member is inserted from one end surface of the cylindrical member toward the concave portion for the sealing member. In this state, a movement restricting portion that restricts the movement of the lid member toward the side approaching the seal member is provided .

  According to this configuration, the support member is configured by the cylindrical member and the lid member. The transmission shaft is inserted into the shaft hole of the cylindrical member, and the seal member is inserted into the seal member recess of the cylindrical member from one end face of the cylindrical member, and the seal member is held in the seal member recess of the cylindrical member. The lid member is inserted from one end surface of the cylindrical member toward the concave portion for the sealing member of the cylindrical member, and the sealing member is sealed in a space surrounded by the concave portion for the sealing member of the cylindrical member, the transmission shaft, and the lid member. As a result, the seal member becomes difficult to be exposed to wind and rain or ultraviolet rays, and the seal member is hardly deteriorated, and the sealing performance of the seal member can be maintained over a long period of time. Further, since the cylindrical member and the lid member are made of synthetic resin, the cylindrical member and the lid member can be formed by resin molding, and the processing cost can be reduced and the weight can be reduced. Further, the cylindrical member and the lid member do not rust due to long-term use, and the cylindrical member and the lid member do not adhere to other members.

Furthermore, according to this configuration, the gap formed between the seal member and the lid member is filled with grease, so that moisture that has entered beyond the lid member does not easily reach the seal member due to the grease. Moreover, the grease can achieve lubrication between the transmission shaft and the cylindrical member or the lid member.

It is a side view which shows a tractor. The side view which shows the state by which a supporting member is interposed between the upper edge part of a cover, and a 3rd transmission shaft. It is a longitudinal cross-sectional view which shows a supporting member. It is an exploded sectional view showing a support member. It is a disassembled perspective view which shows a supporting member. It is a longitudinal cross-sectional view which shows the conventional support member.

  Hereinafter, a tractor equipped with a support member for a seal member according to the present invention will be described.

〔overall structure〕
As shown in FIG. 1, the tractor includes an engine 2 and a pair of left and right front wheels 3 mounted on the front of the body frame 1, a steering handle 4 mounted in the middle of the body frame 1, A driver's seat 5, a mission case 6, a pair of left and right rear wheels 7, and the like equipped at the rear are provided.

(Transmission structure)
As shown in FIGS. 1 and 2, a first transmission shaft 10 that connects a clutch 8 attached to the engine 2 and a hydrostatic continuously variable transmission 9 (hereinafter abbreviated as HST) attached to a transmission case 6. And a third transmission shaft 13 (an example of a transmission shaft) that connects the HST 9 and a second transmission shaft 12 extending rearward from the front wheel differential mechanism 11 provided at the front portion of the body frame 1 is provided. . Thereby, the power of the engine 2 is transmitted to the rear wheels 7 via the first transmission shaft 10, the HST 9, and the auxiliary transmission (not shown) built in the transmission case 6, and the power branched from the auxiliary transmission is the first. 3 is transmitted to the front wheel 3 via the transmission shaft 13, the second transmission shaft 12, and the front wheel differential mechanism 11.

  The third transmission shaft 13 is inclined obliquely forward and downward (lower left in FIG. 2). A lower universal joint 14 for connecting the third transmission shaft 13 and the second transmission shaft 12 is provided at the lower (front) end portion of the third transmission shaft 13, and the upper side of the third transmission shaft 13. An upper universal joint 16 that connects the third transmission shaft 13 and the output shaft 15 from the auxiliary transmission is provided at the (rear) end.

  A cylindrical cover 18 is provided to surround a portion including at least the lower end of the lower universal joint 14 and the third transmission shaft 13. A rear end 17 a of the protective pipe 17 surrounding the second transmission shaft 12 is connected to a lower end 18 b of the cover 18. A joint collar 19 (an example of a support member) is interposed between the upper end 18 a of the cover 18 and the third transmission shaft 13.

(Joint color)
As shown in FIGS. 3 to 5, the joint collar 19 includes a cylindrical member 20 made of a synthetic resin (polyacetal) and a lid member 21 made of a ring-shaped synthetic resin (polyacetal).

  Inside the cylindrical member 20, a shaft hole portion 22 formed along the axial X direction and through which the third transmission shaft 13 is inserted, and one of the cylindrical members 20 along the axial X direction. A seal member recess 23 is formed that opens toward the end surface 20a (on the right side of FIG. 3 and FIG. 4) and holds the ring-shaped seal member 32. A circumferential groove 20 c having a rectangular cross section for accommodating the O-ring 46 is formed on the outer peripheral portion 20 b of the cylindrical member 20. Between the outer peripheral portion 20b of the cylindrical member 20 and the shaft hole portion 22, a fourth hollow portion 47 opened toward the other end surface 20d of the cylindrical member 20 (left side in FIG. 3) is formed.

(Recess for seal member)
As shown in FIGS. 3 to 5, the seal member recess 23 includes an inner peripheral surface 24 and a bottom surface 25. The rear side portion 26 of the inner peripheral surface 24 is configured to have a slightly smaller diameter than the lid member 21. A first circumferential groove 27 having a triangular cross section for positioning the sealing member 32 is formed in the middle of the inner circumferential surface 24 in the axial center X direction of the inner portion 24. The near side portion 28 of the inner peripheral surface 24 is configured to have the same diameter as the lid member 21, that is, a slightly larger diameter than the back side portion 26 of the inner peripheral surface 24. Between the front side portion 28 and the back side portion 26 of the inner peripheral surface 24, a step portion 29 (corresponding to a movement restriction portion) that restricts the movement of the lid member 21 to the back side portion 26 is formed. . A second circumferential groove 30 having a trapezoidal cross section for positioning the lid member 21 is formed in the middle of the front side portion 28 of the inner circumferential surface 24 in the axis X direction. A guide portion 31 is formed at one end of the front side portion 28 of the inner peripheral surface 24 (on the right side in FIG. 3 and FIG. 4).

(Seal member)
As shown in FIGS. 3 to 5, the seal member 32 has a shaft hole portion 54 through which the third transmission shaft 13 is inserted. The seal member 32 is provided so as to be elastically deformable, is provided in a direction orthogonal to the outer peripheral portion 13a of the third transmission shaft 13, and has a triangular cross section where the tip end portion is in pressure contact with the third transmission shaft 13. A plurality (two in this embodiment) of fins provided in a direction inclined with respect to the contact piece 33 and the outer peripheral portion 13a of the third transmission shaft 13 and the tip portion abutting on the outer peripheral portion 13a of the third transmission shaft 13 -Shaped second contact piece 34, first convex portion 35 having a triangular cross section that fits into first circumferential groove 27, and the second (left side of FIGS. 3 and 4) open to the end surface. 1 hollow portion 36. A ring-shaped elastic member 37 is attached to the first contact piece 33 so that the first contact piece 33 is in pressure contact with the outer peripheral portion 13 a of the third transmission shaft 13.

(Cover member)
As shown in FIGS. 3 to 5, the lid member 21 has a shaft hole portion 55 through which the third transmission shaft 13 is inserted. The lid member 21 is configured to be elastically deformable, and includes two chamfered portions 38 formed on both end surfaces, two second hollow portions 40 opened toward both end surfaces, and a second The cross section fitted in the circumferential groove 30 includes a trapezoidal second convex portion 39 (corresponding to a movement restricting portion) .

(Tightening member)
As shown in FIG. 3, a fastening member 42 that clamps the upper end portion 18 a of the cover 18 between the outer peripheral portion 20 b of the cylindrical member 20 is provided. The fastening member 42 has a shape in which a part of the ring is notched and surrounds the upper end portion 18a of the cover 18 and the radially outward side from both ends of the fastening portion 43. Plate-shaped two bolt mounting portions 44 extending in a row, and a bolt 45 inserted into the bolt insertion hole 44a of the bolt mounting portion 44.

  The bolt 45 is inserted into the bolt insertion hole 44a of the two bolt mounting portions 44, and the bolt 45 is fastened. At this time, the O-ring 46 is elastically deformed by the tightening of the tightening portion 43, and the O-ring 46 and the circumferential groove 20c and the O-ring 46 and the upper end 18a of the cover 18 are in close contact with each other. become. Thereby, dirt, mud, rain, etc. can be prevented from entering from the gap between the cylindrical member 20 and the cover 18.

(Joint color assembly work)
The third transmission shaft 13 is inserted into the shaft hole portion 22 of the cylindrical member 20. When the sealing member 32 is inserted from one end face 20a of the cylindrical member 20 toward the sealing member recess 23, the first contact piece 33 and the second contact piece 34 come into contact with the outer peripheral portion 13a of the third transmission shaft 13. And seal. When the seal member 32 is further inserted, the first convex portion 35 is fitted into the first circumferential groove 27 and the seal member 32 is positioned at the holding position on the back side. At this time, the seal member 32 is in close contact with the inner portion 26 and the bottom surface 25 of the inner peripheral surface 24.

  When the sealing member 32 is held in the holding position, grease is injected into the sealing member recess 23 and the lid member 21 is inserted from the one end surface 20a of the cylindrical member 20 toward the sealing member recess 23, so that the chamfered portion is obtained. 38 abuts on the stepped portion 29, and the second convex portion 39 is fitted into the second circumferential groove 30, so that the lid member 21 is positioned at a fixed position on the near side. Thereby, it is possible to prevent soil and mud from entering the space surrounded by the cover 18, the third transmission shaft 13, and the seal member 32. The seal member 32 is sealed in a space surrounded by the seal member recess 23, the third transmission shaft 13, and the lid member 21, and is used for storing grease between the seal member 32 and the lid member 21. Since the space 48 is filled with grease, the moisture that has entered beyond the lid member 21 does not easily reach the seal member 32 due to the grease. Further, the grease can achieve lubrication between the outer peripheral portion 13 a of the third transmission shaft 13 and the shaft hole portion 22 of the cylindrical member 20 and the shaft hole portion 55 of the lid member 21. In addition, since the cylindrical member 20 and the lid member 21 are made of synthetic resin, the cylindrical member 20 and the lid member 21 can be formed by resin molding, and the processing cost can be reduced and the weight can be reduced. Further, the cylindrical member 20 and the lid member 21 do not rust due to long-term use, and the cylindrical member 20 and the lid member 21 do not adhere to the outer peripheral portion 13 a of the third transmission shaft 13.

[Another embodiment]
In the above embodiment, the third transmission shaft 13 is illustrated as connecting the HST 9 and the second transmission shaft 12 extending rearward from the front wheel differential mechanism 11 provided at the front portion of the body frame 1. Instead of the configuration, the transmission shaft may be connected to a gear box of a working device such as a mower and a transmission case.

  The present invention can be applied to various ring-shaped sealing members.

13 Transmission shaft 19 Support member 20 Cylindrical member 20a One end surface 21 Lid member 22 Shaft hole 23 Seal member recess 32 Seal member 48 Grease storage space

Claims (1)

A cylindrical member having a shaft hole portion through which the transmission shaft is inserted and a concave portion for a seal member for holding the seal member that contacts the outer peripheral portion of the transmission shaft is provided, and the cylindrical member is synthesized. Composed of resin,
The seal member recess is opened toward one end surface along the shaft hole in the cylindrical member, and the seal member can be inserted into the seal member recess from one end surface of the cylindrical member. ,
A ring-shaped lid member having a width in the axial direction of the cylindrical member that can be inserted from one end face of the cylindrical member toward the concave portion for the sealing member in a state where the sealing member is inserted into the concave portion for the sealing member. comprise, Ri said lid member is constituted by a synthetic resin Thea,
The seal member is inserted into the seal member recess, and the seal member is inserted in the axial direction of the cylinder member with the lid member inserted from one end surface of the cylinder member toward the seal member recess. A gap for grease storage is formed between the lid member and a movement restricting portion for restricting movement of the lid member to the side approaching the seal member in that state. supporting members for sealing member being.

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