JPH052602U - Bearing device for side-drive type rotary tiller - Google Patents

Abstract

(57) [Summary] [Purpose] To reliably hold the ball bearing in the radial and thrust directions with few parts. [Structure] The bearing holder 14 is formed with a radial receiver 15 which is fitted in a shaft support hole 16 formed in a transmission case 5 and a thrust receiving portion 20 of a ball bearing 19.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a bearing device for a side drive type rotary tiller.

[0002]

[Prior Art]

 In a side-drive type rotary cultivator, a bearing holder is spigot-fitted into the shaft support holes formed in the upper and lower parts of the side transmission case, fixed to the transmission case, and transmitted by the ball bearing fitted in the bearing holder. It supports the shaft and the claw shaft short shaft.

In this bearing device, the radial and thrust receivers of the ball bearing serve as radial receivers by installing another holder paired with the bearing holder in the transmission case and bolting both holders together. A thrust ring was provided by providing a snap ring at the boundary of the holder.

[0004]

[Problems to be solved by the device]

 The conventional bearing device requires a pair of holders, has many components, and is troublesome to assemble and disassemble. In addition, since a retaining ring groove is formed in the outer race of the ball bearing and the retaining ring is fitted in this groove for thrust bearing, it is not possible to use a commercially available ball bearing, and the structure is complicated and the cost is low. It was also a disadvantage.

The present invention reduces the number of parts by integrally forming a radial receiver on the bearing holder, and forms a thrust receiver in a cut-and-raised shape at the edge of the shaft support hole, so that it can be sold on the market. The purpose is to be able to adopt bearings.

[0006]

[Means for Solving the Problems]

 According to the present invention, bearing holders 14 and 27 are installed opposite to shaft support holes 16 and 28 formed in the side transmission case 5 and fixed to the transmission case 5, and balls fitted into the bearing holders 14 and 27 are fixed. In a bearing device in which the bearings 19 and 30 support the transmission shaft 12 or the pawl shaft short shaft 31, the following technical measures are taken to achieve the above-mentioned object.

That is, according to the present invention, the radial bearings 15,29 which are fitted in the shaft supporting holes 16,28 are formed in the bearing holders 14,27 and the thrust bearing portions 20,32 of the ball bearings 19,30 are formed. Is bent at the edge of the shaft supporting holes 16 and 28.

[0008]

[Action]

 According to the present invention, in the upper part of the side transmission case 5, the radial receiver 15 of the bearing holder 14 attached to the arm 4 is installed in the upper shaft support hole 16 of the transmission case 5 as shown in FIGS. 1 and 2. After fitting, the holder 14 is fixed to the case 5 with bolts 18. A ball bearing 19 is fitted to the radial receiver 15 to support the transmission shaft 12, and a thrust receiver 20 bent at the edge of the shaft support hole 16 prevents the outer race 19 A of the bearing 19 from coming off in the axial direction.

On the other hand, in the lower portion of the side transmission case 5, as shown in FIG. 3, the radial bearing 29 of the bearing holder 27 is fitted in the lower shaft support hole 28 of the transmission case 5 and fixed with the bolt 26. The ball bearing 30 that supports the short shaft 31 is held by the radial receiver 29, and the outer race 30A is axially retained by a thrust receiver 32 formed by bending at the edge of the lower shaft support hole 28.

[0010]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. In FIG. 9 showing a part of the side-drive rotary cultivator 1 in a partially expanded state, the cultivator 1 is provided with a central transmission case 3 having a bevel gear mechanism 2 built-in at substantially the center in the left-right direction. Arms 4 are fixed to the left and right sides of the transmission case 3 and pushed outward in the left and right direction.One side of the arm body 4 is fixed to the side transmission case 5, and the other arm body 4 is fixed to the side frame 6. In addition, a pawl shaft 10 having pawls 9 is rotatably supported around bearing shafts 7 and 8 at the lower portions of the transmission case 5 and the side frame 6, respectively.

A chain transmission mechanism 11 is provided inside the side transmission case 5, and an output side of the bevel gear mechanism 2 and an upper portion of the chain transmission mechanism 11 are connected by a transmission shaft 12. On the upper part of the side transmission case 5, the bearing device 13 according to the embodiment of the present invention shown in FIGS. 1 and 2 is adopted. In FIGS. 1 and 2, a bearing holder 14 made of aluminum or another metal material is fixed to the end of the arm body 4, and a radial receiver 15 is provided on the holder 14 in an axially protruding shape. The receiver 15 is fitted in the upper shaft support hole 16 formed in the transmission case 5 with the spigot, and the flange 17 is fixed to the transmission case 5 by the bolt fasteners 18.

The radial receiver 15 has a cylindrical shape, a ball bearing 19 is fitted on the inner peripheral surface thereof, the transmission shaft 12 is supported by the bearing 19, and the outer race 19 A of the bearing 19 is an upper shaft support. The inner race 19B of the bearing 19 is splined or keyed to the drive shaft 12 while being axially retained by a thrust receiver 20 that is formed by bending inward in the radial direction at the lower peripheral edge of the hole 16. The boss portion 21A of the sprocket 21 is axially retained.

In FIGS. 1 and 2, reference numeral 22 is a shaft insertion hole, which is capped with a cap 23, 24 is a seal, and 25 is a chain. Referring to FIG. 3, there is shown a bearing device 7 according to an embodiment of the present invention in a lower portion of the side transmission case 5. In FIG. 3, a lower bearing holder 27 fixed to a lower inner surface of the side transmission case 5 by a fastener 26 such as a bolt has a radial receiver 29 fitted in a lower shaft support hole 28 in a spigot. A ball bearing 30 is fitted to the radial receiver 29 to rotatably support the pawl shaft short shaft 31, and the outer race 30A of the ball bearing 30 is formed in a radially inward direction at the upper edge of the shaft support hole 28. The thrust receiver 32 prevents the inner race 30B from being axially pulled out, and the inner race 30B is axially held by the boss portion 33A of the driven sprocket 33 that is splined or keyed to the pawl shaft short shaft 31.

A flange 31A is provided at the inner end of the pawl shaft short shaft 31, and the outer end flange 10A of the pawl shaft 10 is connected to the flange 31A by a fastener 34. A chain transmission mechanism 11 is formed by hooking a chain 25 between the bracket 21 and the driven sprocket 33. The chain 25 of the chain transmission mechanism 11 is engaged with a pair of chain tensioners 35 as shown in FIG. ing.

The side transmission case 5 is constructed by assembling the case substrate 5A and the case cover 5B in the middle structure, and a hole 36 is formed in the lower part of the case cover 5B which is in contact with the pawl shaft short shaft 31. Is formed, and the hole 36 is plugged with a removable plug body 37. The hole 36 is used for maintenance of the inside of the case, attachment of the extension shaft, and the like. As shown in FIGS. 3 and 5 and 6, a protective cover 38 is provided at the lower part of the side transmission case 5 to cover the front and lower sides thereof and the plug body 37 from the outer surface. It has a hole 38A which is fitted and positioned by a drain plug 39 of a lubricating oil provided in a lower part, and a front upper part is detachably fixed by a bolt 40.

Referring to FIG. 4, a second embodiment of the bearing device 7 is shown. In the second embodiment, the bearing holder 27 is a die-cast product made of aluminum and its alloy, and the like, and the outer surface of the bearing holder 27 has a meal groove 41 that surrounds the outer circumference of the rare-earth fastener 26 in an annular shape, and the inner surface of the rare-earth fastener. There are seal grooves 42, 43 surrounding the inner and outer circumferences of the ring 26, and a seal material 44 shown by rolling is fitted in the name seal grooves 41, 42, 43.

According to the second embodiment, the bearing holder 27 can be manufactured easily and with high accuracy. The other parts of the configuration are the same as in FIG. 3, so common parts are denoted by common symbols. Referring to FIGS. 7 and 8, details of the machine frame and the bevel gear mechanism 2 of the cultivator 1 mounted on a tractor (not shown) by a two-point link system are shown.

Referring to FIGS. 7 to 9, the central transmission case 3 is made by die-casting a light alloy material such as aluminum, and uses a die having a mating surface and a core die that is pulled out from the die. It is die cast. The central transmission case 3 has a bearing fitting hole 45 in its front part and a bevel gear insertion / removal hole 46 on one side. This insertion / removal hole 46 can be closed with a lid 46A made of a light alloy material such as aluminum. An output shaft insertion / removal hole 48 is formed on the other side portion so that the bevel gear insertion / removal hole 46 is aligned with the hole center.

The case body 49 having the bevel gear insertion / removal hole 46 and the output shaft insertion / removal hole 48 is circular in side view, and the bolt insertion holes 50 and the arc-shaped recesses are alternately formed in the circumferential direction on both side surfaces thereof. The bolt insertion hole 50 is formed so as to penetrate therethrough and has a slope for removing the mold. The cylindrical boss of the output shaft insertion / removal hole 48 and the boss of the bolt insertion hole 50 are reinforced by ribs 51 arranged radially, and the front part of the case main body 47 has a T-shaped rib on the top and bottom (both sides) and both sides. It has front and rear ribs, which guarantees the strength of the transmission case 3 even though it is made of a light alloy to reduce the weight.

Bolt insertion holes are formed through the upper and lower parts of the front portion of the case body 47, that is, the front case portion 52 having the bearing fitting hole 45 inside, and the bolt insertion hole has a draft angle. The two-point link bracket 53 shown in FIG. 8 is attached with bolts 54. On both side surfaces of the case body 47, the plate-shaped base bowl parts 55 of the bowl body 4 are overlapped, and the bolts 56 inserted into the bolt insertion holes 50 with the case body 47 sandwiched between the bowl parts 55 and It is fastened with a nut 57, so that the case body 47 receives a compressive force and a tensile force with a bolt 56. The front two of the bolt insertion holes 50 are used as fitting holes for positioning knock pins, and the bolt nuts 56 and 57 are fastened together with the base flange 58A of the rotary mast 58.

The bevel gear transmission 3 comprises an input shaft 60 having a bevel pinion 59 and an output shaft 12 having a bevel gear 61 meshing with the pinion 59. The input shaft 60 is connected via a constant velocity joint shaft (not shown). It is connected to the PTO shaft of the tractor, and the output shaft 12 is inserted into one arm 4 and is connected to the winding transmission means 11. The input shaft 60 is rotatably supported by a radial ball bearing 62 fitted in the bearing fitting hole 45, and the input shaft 60 and the bearing 62 are fitted together from the opening end of the bearing fitting hole 45. The open end is closed by a lid 63 with a seal.

The bevel gear 61 is fitted into the case body 47 through an insertion / removal hole 46 formed in one side portion of the case body 47, and the output shaft 12 can be axially inserted / removed at the center of the bevel gear 61 with a spline, a key, or the like. The insertion pilot shaft portion 12A of the output shaft 12 is rotatably supported by the radial ball bearing 63 fitted in the lid 46A. The output shaft 12 is axially inserted and removed from the side transmission case 5 side as shown by the arrow in FIG. 8. Therefore, the insertion hole 22 of the output shaft 12 is formed on the outer surface of the side transmission case 5. This hole is closed by a removable plug body 23 as shown in FIG.

When pulling out the output shaft 12 from the bevel gear 61, a protrusion 64 for holding the outer circumference of the bevel gear 61 is formed on the case body 47 in order to prevent the bevel gear 61 from moving axially due to the pulling resistance and falling. Is formed on the inner surface of. The protrusions 64 are formed on the inner surface of the case body 47 facing the bevel pinion 59 in the first embodiment so as to also serve as ribs that are long in the axial direction in the radial arrangement, and in the second embodiment, they are semi-circular ribs. It is also formed.

Therefore, the bevel gear 61 is prevented from moving in the pull-out direction by the pull-out resistance when pulling out the output shaft 12, by the bevel pinion 59 and the protrusion 64, and thereby the bevel gear 61 is placed in an orderly assembled posture. Hold and facilitate reassembly of the output shaft 12. In addition, in FIG. 8, reference numeral 65 designates a lift rod. Therefore, the side-drive type rotary cultivator 1 shown in the figure is mounted to the tractor by a two-point link system for lifting and lowering, and 66 is mounted on the rear side. It is a two-wheel holder that is pivotally attached to the arm 4 with a bolt 68 and moved up and down by an adjusting body 67 between the arm 58 and the mast 58.

[0025]

[Effect of the device]

 The present invention is as described above, and the radial bearing of the bearing holder is spigot-fitted into the shaft support hole formed in the side transmission case to hold the radial direction of the ball bearing, while the thrust stopper of the ball bearing is Since the thrust bearing is bent at the hole edge of the shaft support hole, it can be held securely even if the number of parts is small, and a commercially available ball bearing can be adopted.

[Brief description of drawings]

FIG. 1 is a sectional view of an upper bearing device.

FIG. 2 is a side view of FIG.

FIG. 3 is a sectional view of a lower bearing device.

FIG. 4 is a sectional view showing another embodiment of the lower bearing device.

FIG. 5 is a side view of the lower bearing device.

FIG. 6 is a view showing an arrow A in FIG.

FIG. 7 is a side view showing a main part of a rotary machine frame.

FIG. 8 is a sectional view of the inside of the central transmission case.

FIG. 9 is an overall configuration diagram of a rotary cultivator.

[Explanation of symbols]

 5 Side transmission case 12 Transmission shaft 14 Bearing holder 15 Radial receiver 16 Shaft support hole 20 Thrust receiver 27 Bearing holder 28 Shaft support hole 29 Radial receiver 31 Claw shaft Short shaft 32 Thrust receiver

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Koichi Iwasaki, 64 Ishizukita-machi, Sakai City, Osaka Prefecture Kubota Sakai Factory Co., Ltd. (72) Takashi Sugawara, 64, Ishizukita-machi, Sakai City, Osaka Prefecture Kubota Sakai Manufacturing Co., Ltd. (72) Inventor Kazumi Umeki 64, Ishizukitamachi, Sakai City, Osaka Prefecture Kubota Sakai Factory Co., Ltd. (72) Inventor, Koei Tsujino, 64, Ishizukitamachi, Sakai City, Osaka Prefecture Kubota Sakai Factory Co., Ltd. (72) Inventor Takuya Matsuda 64 Ishizukita-cho, Sakai City, Osaka Prefecture Kubota Sakai Factory

Claims (1)

[Claims for utility model registration] [Claim 1] The shaft support hole (1) formed in the side transmission case (5)
Ball bearings (19) (30) fitted with bearing holders (14) and (27) by bearing bearing holders (14) and (27) on 6 and (28), fixed to the transmission case (5) In a bearing device that supports the transmission shaft (12) or the pawl shaft short shaft (31) with a radial receiver (1
5) (29) is formed on the bearing holders (14) (27), and the thrust receiving parts (20) (32) of the ball bearings (19) (30) are connected to the holes of the shaft support holes (16) (28). A bearing device for a side drive type rotary cultivator, which is formed by bending the edge.