JPH0842671A - Bevel case mounting structure - Google Patents

Abstract

PURPOSE:To facilitate automation of assemblying, to improve productivity, and besides to reduce a production cost by constituting the structure in two divisions which are intercoupled through weld connection. CONSTITUTION:A bevel mounting structure is constituted in two-division structure wherein a pair of half-division cases 20A and 21A are intercoupled through weld interconnection of respective joints 20a and 21a. Nipping parts 20b and 21b to nip in a bracing state the end parts of transmission shaft cases 14 and 16 supporting in a coupled state transmission shafts 3, 5, and 9 by means of bearings are formed at the respective half-division cases. Bearings 15 and 17 to support the transmission shafts are supported in a fitted-in state at the end part of the transmission shaft cases. Further, annular protrusion parts 14a and 16a receiving the bearings for positioning support are formed in an expansion state on the inner peripheral surfaces of the transmission shaft cases 14 and 16 and recessed grooves 14b and 16b formed facing the annular protrusion parts 14a and 16a are filled with an adhesive.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bevel case mounting structure for covering a bevel gear mechanism for transmittingly connecting transmission shafts in intersecting directions.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 6, a bevel case 30 is a cast product such as an aluminum die cast having a hollow portion 30a for accommodating a bevel gear mechanism 31 and a plurality of openings 30b for inserting a transmission shaft. It is configured as an integrated structure,
To mount the bevel case 30, the components such as the transmission shaft 32, the bevel gear 33, and the bearing 34 are sequentially assembled from the opening 30b of the bevel case 30, and the bevel gear mechanism 31 is housed in the hollow portion 30a of the bevel case 30. This is done by bolting the transmission shaft case 35 with the flange 36.

[0003]

However, according to the above-mentioned prior art, it is difficult to automate the assembling, the number of parts required for connection and the number of manufacturing processes are increased, and the productivity is lowered and the production cost is increased. It was happening.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a bevel case mounting structure which is easy to assemble automatically, has high productivity, and can reduce production cost.

[0005]

In order to achieve the above object, according to the first aspect of the present invention, a bevel case for covering a bevel gear mechanism for transmittingly connecting transmission shafts in intersecting directions is formed by pressing a sheet metal material. The pair of half-split cases are configured in a split-split structure in which they are connected by welding connections of their respective joints, and each half-split case has an end portion of each transmission shaft case that bears the transmission shaft in a coupled state. A holding portion is formed so as to be held so that it can be held, and a bearing for supporting the transmission shaft is internally fitted and supported at an end portion of the transmission shaft case, and an annular convex portion for receiving and positioning the bearing is supported by the transmission shaft. An adhesive was filled in a concave groove formed on the inner peripheral surface of the case so as to bulge and formed on the outer peripheral surface of the transmission shaft case corresponding to the annular convex portion.

Further, in the second aspect of the present invention, in the first aspect of the present invention, a convex portion that engages with the concave groove on the inner surface side of the holding portion in a state where the holding portion holds the end of the transmission shaft case. Was formed.

[0007]

According to the first aspect of the present invention, the transmission shafts are supported by the respective transmission shaft cases, and the bevel gears are attached to the respective transmission shafts that are connected so as to be transmittable in the intersecting direction. The end portion of the transmission shaft case filled with the adhesive is fitted into the holding portion of one of the half-divided cases, and the bevel gears are meshed with each other. Then, the other half case is covered on the other half case in a state in which the respective joint parts are aligned with each other and fixed by a jig, and then placed on the welding line to join the half case cases and the half case case. The bevel case can be completed in a state in which the bevel gear mechanism is incorporated and the transmission shaft case is connected by welding and connecting the holding outer periphery of the holding part of the case and the transmission shaft case with a welding robot. That is, unlike the above-described conventional technique, there is no difficulty of sequentially assembling each component from the opening of the bevel case, and each component can be easily assembled and loaded from the open side of the half case. Even when the bevel case and the transmission shaft case are connected, the number of parts and the manufacturing process can be simplified. Also, the adhesive filled in the groove of the transmission shaft case has a sealing function by hardening between the holding part of the half case and the end of the transmission shaft case. The airtightness of the joint with the case can be improved. Moreover, even if the sandwiching part of the half case and the end of the transmission shaft case, which is the bearing support part, are adhesively connected by an adhesive material, it is sufficient even if spot welding is used for this part to make a welding connection. It is possible to obtain good connection strength and suppress distortion due to welding heat.

According to the second aspect of the present invention, the convex portion formed on the inner surface side of the holding portion of the half-split case is engaged with the concave groove formed on the outer peripheral surface of the end of the transmission shaft case, so that the half-split case is formed. Since the bevel gear can be positioned, the meshing accuracy of the bevel gear can be easily ensured. In addition, by inserting the convex part of the half-split case into the concave groove of the transmission shaft case, the adhesive material is pushed into the gap between the joint part of the half-split case connected by pushing out the adhesive material filled in the concave groove and the transmission shaft case. Since it can be flowed in, the airtightness of the joint between the bevel case and the transmission shaft case can be further enhanced.

[0009]

Therefore, according to the first aspect of the present invention, a robot or the like is used in the process of assembling the bevel gear mechanism or the like, and the process of welding and connecting the half-split cases or the sandwiching portion of the half-split cases and the transmission shaft case. The automation can be promoted, and the airtightness and the bearing accuracy can be improved, thereby improving the productivity, reducing the production cost, and improving the quality. In other words, automation of assembly is easy and productivity is high, and
It has become possible to provide a mounting structure for a bevel case, which is of high quality and can reduce production cost.

According to the second aspect of the present invention, in addition to the structure of the first aspect,
By improving the productivity and reducing the production cost by adding a simple improvement to the holding parts of each half case, only by forming a convex part that engages with the concave groove of the transmission shaft case, Further, it has become possible to provide a bevel case mounting structure capable of improving the assembling accuracy and further improving the airtightness.

[0011]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows the rear surface of a group of pulling devices 1 which are erected on the front part of a combine, which is an example of a work vehicle, in a state of being tilted backward and aligned side by side in the left-right direction. As shown in FIG. 2, a lateral transmission shaft 2 to which power from an engine (not shown) is transmitted via a transmission system (not shown) is horizontally installed in the upper rear portion of the pulling device 1. Power is distributed and supplied to each of the pulling devices 1 from the lateral transmission shaft 2.

The transmission structure from the lateral transmission shaft 2 to each of the raising devices 1 will be described in detail. As shown in FIGS. 1 to 3, the lateral transmission shaft 2 is integrally rotatable about the transmission shafts 3 by the cylindrical shaft 4. And a vertical transmission shaft 5 extending downward from the connecting portion. The transmission shaft 3 and the transmission shaft 5 that intersect with each other are formed by a bevel gear 6 that is spline-fitted to the end of the transmission shaft 3 and a bevel gear mechanism 8 that is spline-fitted to the upper end of the transmission shaft 5. Are communicatively coupled by. A front and rear transmission shaft 9 extending from the lower end toward the pulling device 1 is provided at the lower end of each of the transmission shafts 5. The transmission shaft 5 and the transmission shaft 9 that intersect with each other are formed by a bevel gear 10 that is spline-fitted to the lower end of the transmission shaft 5 and a bevel gear mechanism 12 that is spline-fitted to the rear end of the transmission shaft 9. Are communicatively coupled by. A drive sprocket 13 of the pulling device 1 is spline-fitted to the front end of the transmission shaft 9 so as to be integrally rotatable. That is, the motive power from the engine transmitted to the lateral transmission shaft 2 is transmitted to the drive sprocket 13 of the raising device 1 via the bevel gear mechanism 8, the transmission shaft 5, the bevel gear mechanism 12, and the transmission shaft 9 to cause the raising. It is adapted to drive the device 1.

The transmission shafts 3 are each installed in a transmission shaft case 14 made of round steel pipe material. On both inner peripheral surfaces of both ends of the transmission shaft case 14, bearings 15 for supporting the transmission shaft 3 are fitted and supported, and annular projections 14a for receiving and positioning the bearings 15 are bulged. That is, the transmission shaft 3 is internally supported by the transmission shaft case 14 via the pair of left and right bearings 15. Further, on the outer peripheral surfaces of both ends of the transmission shaft case 14, annular concave grooves 14b are formed corresponding to the annular convex portions 14a bulged on the inner peripheral surface. A thermosetting adhesive is filled in the groove 14b.

The vertically oriented transmission shafts 5 are each installed in a transmission shaft case 16 made of round steel pipe material.
On both inner peripheral surfaces of both ends of the transmission shaft case 16, a bearing 17 for supporting the transmission shaft 5 is internally fitted and supported, and an annular convex portion 16a for receiving and positioning the bearing 17 is bulged and formed. That is, the transmission shaft 5 is internally supported by the transmission shaft case 16 via the pair of left and right bearings 17. Further, an annular groove 16b is formed on the outer peripheral surface of each end of the transmission shaft case 16 so as to correspond to the annular convex portion 16a bulged on the inner peripheral surface. The groove 16b is filled with a thermosetting adhesive material.

The front and rear transmission shafts 9 are respectively provided with the pulling device 1.
It is adapted to be installed in a transmission shaft case 18 made of a round steel pipe material connected to. On both inner peripheral surfaces of both ends of the transmission shaft case 18, a bearing 19 for supporting the transmission shaft 9 is fitted and supported, and an annular convex portion 18a for receiving and positioning the bearing 19 is bulged. That is, the transmission shaft 9 is internally supported by the transmission shaft case 18 via the pair of left and right bearings 19. Further, on the outer peripheral surface of each of both ends of the transmission shaft case 18, an annular concave groove 18b is formed corresponding to the annular convex portion 18a bulged on the inner peripheral surface.
Are formed. The groove 18b is filled with a thermosetting adhesive material.

The bevel gear mechanism 8 connecting the transmission shaft 3 and the transmission shaft 5 so as to be able to transmit power is a T-shaped bevel case 2 respectively.
It is covered with 0. Bevel case 20
Is a flange-shaped joining portion 20 for each of a pair of half-split cases 20A formed in a T shape by pressing a sheet metal material.
It has a split structure in which it is connected by a, and is joined by continuously welding the outer periphery of the joined joint 20a. Each half case 2
A holding portion 20b is formed in 0A so as to hold the end portions of the transmission shaft cases 14 and 16 in a connected state between the half cases 20A. On the inner surface side of the holding portion 20b, a convex portion 20c that engages with the recessed grooves 14b and 16b of the transmission shaft cases 14 and 16 in a state where the holding portion 20b holds the ends of the transmission shaft cases 14 and 16 is locally formed. Has been formed.

The bevel gear mechanism 12 for connecting the transmission shaft 5 and the transmission shaft 9 to each other for transmission is covered by an L-shaped bevel case 21. Bevel case 21
Is a flange-shaped joining portion 21 for each of a pair of half-split cases 21A formed in an L-shape by pressing a sheet metal material.
It is configured in a two-part structure that is connected by a, and is integrally formed by continuously welding the outer peripheral portion of the joined joint portion 21a. Each half case 2
1A is formed with a holding portion 21b for holding the end portions of the transmission shaft cases 16 and 18 in a connected state of the half cases 21A. On the inner surface side of the holding portion 21b, a convex portion 21c that engages with the concave grooves 16b and 18b of the transmission shaft cases 16 and 18 in a state where the holding portion 21b holds the ends of the transmission shaft cases 16 and 18 is locally formed. Has been formed.

Assembling of the power distribution and supply portion for distributing and supplying power from the lateral transmission shaft 2 to each of the raising devices 1 will be described below. First, the respective transmission shafts 3, 5, 9 are connected to the respective transmission shaft cases 1 via the bearings 15, 17, 19, respectively.
Bearings 4, 16 and 18 are supported. Next, of the respective transmission shafts 3, 5, 9 the respective bevel gears 6, 6 are attached to the ends of the transmission shafts 3, 5, 9 which are connected so as to be transmittable in the intersecting direction.
After the splines 7, 10 and 11 are fitted to each other by splines, the transmission shafts 3 are spline-connected by the cylindrical shaft 4 to form the lateral transmission shaft 2. Then, the recessed grooves 14 formed at both ends of each transmission shaft case 14 and the upper end of the transmission shaft case 16.
b and 16b are filled with a thermosetting adhesive, and the holding portion 2 of one half case 20A of the bevel case 20 is held.
0b is the end of the transmission shaft case 14 and the transmission shaft case 1
The bevel gears 6 and 7 are engaged by fitting and mounting the upper end portion of 6 so that the convex portion 20c of the holding portion 20b engages with the concave grooves 14b and 16b of the transmission shaft cases 14 and 16. Then, the other half case 20A is added to the half case 20A.
A is covered with the joint portions 20a in a state of being aligned with each other and fixed by a jig, and the outer peripheral portion of the joined joint portion 20a, the holding portion 20b of the half case 20A and the transmission shaft case 14,
The outer peripheral portion of the pinch with 16 is continuously welded. Also, the lower end of each transmission shaft case 16 and the recessed grooves 16b, 18b formed in the end of the transmission shaft case 18 are filled with a thermosetting adhesive, and one half of the bevel case 21 is divided. The lower end portion of the transmission shaft case 16 and the both end portions of the transmission shaft case 18 are connected to the holding portion 21b of the case 21A by the holding portion 21b.
The convex portion 21c of the concave groove 16b of the transmission shaft case 16, 18,
Bevel gear 1 by fitting and mounting so as to engage with 18b
Engage 0 and 11. After that, this half case 21
The other half-split case 21A is covered with A in such a state that the respective joints 21a are aligned with each other, and is fixed by a jig, and the outer periphery of the joint 21a joined together, and the holding portion 21b and the transmission shaft case of the half-split case 21A. The outer peripheral portions of the grips 16 and 18 are continuously welded. And by the above process,
The bevel cases 20 and 21 can be completed in a state where the respective bevel gear mechanisms 8 and 12 are installed and the respective transmission shaft cases 14, 16 and 18 are connected.

That is, the bevel gears 6 and 6 are formed by forming the bevel cases 20 and 21 into a two-piece structure composed of pressed half cases 20A and 21A made of sheet metal.
Assembling and loading of respective parts such as 7, 10, 11 can be easily performed from the opening side of the half cases 20A, 21A, and the bevel cases 20, 21 and the transmission shaft case 1
The number of parts and the manufacturing process can be simplified even in connection with 4, 16, and 18, whereby the assembling process of the bevel gear mechanisms 8 and 12, and the like.
Half case 20A, 21A and half case 20
A and 21A holding parts 20b and 21b and transmission shaft case 1
In the welding connection process with 4, 16, and 18, it is possible to promote automation using a robot or the like. Further, by making the adhesive material filling the respective concave grooves 14b, 16b, 18b thermosetting, the adhesive material is surely hardened by welding heat at the time of welding connection and high heat on the coating line, Bevel case 20, 21 and transmission shaft case 14,
The airtightness of the connecting portion with 16, 18 can be enhanced, and further, the respective convex portions 2 can be formed in the respective concave grooves 14b, 16b, 18b.
0c, 21c are engaged, and the concave grooves 14b, 16b, 18
In the bevel case 20, 21, in which the adhesive material filled in b is extruded and connected, the adhesive material is caused to flow into the gap a between the joint portion between the holding portions 20b, 21b and the transmission shaft cases 14, 16, 18 to make the bevel Cases 20 and 21
Therefore, suitable airtightness can be obtained at the connecting portions between the transmission shaft cases 14, 16 and 18.

[Other Embodiments] Other embodiments of the present invention will be listed below. The bevel cases 20 and 21 can be applied to various locations that cover the bevel gear mechanism, and are not limited to the work vehicle and the installation locations illustrated in the above embodiment. In the above embodiment, the bevel case 20 is T
Although the L-shaped bevel case 21 is exemplified as the bevel case 21, other shapes such as a cross shape may be used. In the above-described embodiment, the split structure is composed of a pair of half-split cases 20A of the same shape (T-shape) split into two in the direction along the respective axes of the transmission shafts 3 and 5 intersecting the bevel case 20. In addition, the bevel case 21 is divided into two in a direction along the axis of each of the transmission shafts 5 and 9 in the intersecting direction, and a pair of half-cases 21A having the same shape (L shape) are formed.
The bevel case 20 has a transmission shaft 3 as shown in FIG. 5, for example.
May be configured in a halved structure composed of a pair of half-split cases 20A having different shapes, which are halved only in the direction along the axial center of the transmission shaft. It may be configured to have a two-part structure composed of a pair of half-part cases having different shapes divided in two along the direction. Similarly, the bevel case 21 may be configured as a split structure including a pair of split half cases having different shapes, which are split into two in a direction along only the axis of one of the transmission shafts 5 and 9. In the above embodiment, the joined half case 20 is used.
Continuously welding the outer peripheral portions of the joint portions 20a and 21a of A and 21A, and the outer peripheral portions of the holding portions 20b and 21b of the half cases 20A and 21A and the transmission shaft cases 14, 16 and 18, respectively. According to the half case 20A, 2
Although the 1A and the half cases 20A and 21A and the transmission shaft cases 14, 16 and 18 are connected to each other, they may be connected to each other by spot welding instead. Holding parts 20b, 21b and transmission shaft cases 14, 16,
You may make it apply | coat an adhesive agent to the joint surface with which 18 is joined. This can enhance the airtightness of the joint. Joining portions 20a, 21 of the half cases 20A, 21A
Instead of forming a in a flange shape, the outer peripheral portions of the abutted plate thickness portions may be welded. As the half cases 20A and 21A, the holding section 20
b and 21b, the groove 1 of the transmission shaft case 14, 16, 18
The protrusions 20c and 21c that engage with 4b, 16b, and 18b may not be formed. Grooves 14b, 16 of the transmission shaft cases 14, 16, 18
The adhesive to be filled in b and 18b is not limited to the thermosetting adhesive, and various adhesives can be used.

It should be noted that reference numerals are given in the claims for convenience of comparison with the drawings, but the present invention is not limited to the configurations of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 is a rear view of the raising device section.

FIG. 2 is a vertical sectional side view of a transmission section showing a configuration of a bevel case.

FIG. 3 is a vertical cross-sectional front view of a transmission unit showing a configuration of a bevel case.

FIG. 4 is a cross-sectional view of E-I and ROL0 in FIG.

FIG. 5 is an external view showing a split structure of a bevel case according to another embodiment.

FIG. 6 is a vertical sectional front view of a transmission unit showing a configuration of a bevel case according to a conventional technique.

[Explanation of symbols]

 3 transmission shaft 5 transmission shaft 8 bevel gear mechanism 9 transmission shaft 12 bevel gear mechanism 14 transmission shaft case 14a annular convex portion 14b concave groove 15 bearing 16 transmission shaft case 16a annular convex portion 16b concave groove 17 bearing 18 transmission shaft case 18a annular convex portion 18b Groove 19 Bearing 20 Bevel case 20A Half case 20a Joint 20b Holding part 20c Convex 21 Bevel case 21A Half case 21a Joint 21b Holding 21c Convex

Claims (2)

[Claims] 1. Transmission shafts (3), (5) in the intersecting direction,
A bevel gear mechanism (8) that couples (9) to the transmission,
The bevel cases (20) and (21) covering the (12) are joined to the joining portions (20a) and the pair of half-split cases (20A) and (21A) formed by pressing a sheet metal material.
(21a) is connected by welding connection to form a split structure, and the transmission shafts (3), (5), and (9) are bearing-supported in the connected state in each of the half cases (20A) and (21A). Each of the transmission shaft cases (14), (16),
A holding part (20) that holds the end of (18) so as to hold it.
b) and (21b) are formed, and the transmission shaft case (1
Bearings (1) for supporting the transmission shafts (3), (5) and (9) at the ends of 4), (16) and (18).
5), (17), and (19) are fitted in and supported, and annular projections (14a), (16a) that receive and position and support the bearings (15), (17), (19),
(18a) is the transmission shaft case (14), (16),
(18) The transmission shaft case (1
4), (16), (18) on the outer peripheral surface of the annular projection (1
4b), (16a), (18a) corresponding to the groove (14b), (16b), (18b) is formed by filling the bevel case mounting structure. 2. The holding parts (20b), (21b) are provided on the inner surface side of the holding parts (20b), (21b) so that the ends of the transmission shaft cases (14), (16), (18) are attached to the holding parts (20b), (21b). The bevel case mounting structure according to claim 1, wherein convex portions (20c) and (21c) that engage with the concave grooves (14b), (16b) and (18b) while being held are formed.