JPS6243172Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to an abnormal noise prevention device for various types of work equipment that is attached to a tractor and used. It is designed to prevent this.

BACKGROUND ART In a working machine such as a forward/reverse rotary device that is attached to a tractor and used, the working part is driven by power transmitted from the tractor via a universal joint shaft. In this type of work machine,
In a power transmission system that incorporates a bevel gear mechanism with at least two bevel gears that mesh with each other in order to change the direction of rotation, if the universal joint shaft moves at an inconstant velocity as the work equipment moves up and down, The unevenness of rotation appeared on the bevel gear side, causing a phenomenon in which the meshing portions of the bevel gears hit each other, causing abnormal noise.

This invention solves these conventional problems and
It was provided for the purpose of preventing the occurrence of abnormal noise at the meshing part of the bevel gear, and its feature is that it uses the power from the universal joint shaft to
In a power transmission device that drives a required part through at least two bevel gears that mesh with each other, resistors that contact each other and rotate together with the bevel gears are provided on the cross direction sides of the bevel gears, and these resistors The point is that at least one of the bodies is made of elastic material.

The present invention will be described in detail below with reference to the illustrated embodiment. In FIG. 1, 1 is a tractor, 2 is a hydraulic system, and 3 is a PTO shaft. Reference numeral 4 denotes a forward/reverse rotary device, which is attached to the rear of the tractor 1 via a three-point linkage mechanism 5, and is movable up and down by a hydraulic device 2. The rotary device 4 is the PTO shaft 3 of the tractor 1.
The claw shaft 7 can be driven in forward and reverse directions by the power transmitted through the universal joint shaft 6, and its power transmission system is constructed as shown in FIGS. 2 and 3.

That is, in FIGS. 2 and 3, 8 is an input gear case, and support arms 9 are integrally formed on both sides of this gear case 8. 10 is an input shaft, which is connected to the bearing case 1 via bearings 11 and 12.
3, and this input shaft 10 is rotatably supported by the tractor 1 through a universal joint shaft on the front end side.
It can be connected to the PTO shaft 3, and a bevel gear 14 is formed at the rear end. Bearing case 13
is attached to a support bracket 15 attached to the front of the gear case 8. Support bracket 1
5 has a pair of left and right support parts 16, 17 that protrude into the gear case 8, and bevel gears 20, 21 are connected to each support part 16, 17 via bearings 18, 19.
is held rotatably. Bevel gear 2
0 and 21 are engaged with the bevel gear 14 of the input shaft 10 from both left and right sides, and spline holes 24 and 25 are formed in the inner periphery of the boss portions 22 and 23 of each bevel gear 20 and 21, respectively. . 26 is a transmission shaft, one support arm 9
One end is supported by one support part 16 of the support bracket 15 via a bearing 28, and the other end is supported by a bearing case on the chain case 27 side. Supported. Note that this transmission shaft 26
A sprocket is fixedly installed in a chain case 7, and the pawl shaft 7 can be driven via a chain hung from the sprocket. The inner end of the transmission shaft 26 is loosely inserted into the bevel gears 20 and 21, and a shifter 2 for forward/reverse switching is attached to this inner end.
9 is spline-fitted to be slidable in the axial direction. The shifter 29 has at one end a spline portion 30 that can be freely fitted into and removed from the spline holes 24 and 25 of each bevel gear 20 and 21, and has a circumferential groove 31 at the other end. Reference numeral 32 designates a pair of upper and lower engaging members that engage with the circumferential groove 31 of the shifter 29, and can be operated by an operating lever 34 for forward/reverse switching via a vertical rotation 33 inserted and supported by the gear case 8. 35 is a power take-off shaft, which is connected to the bearing case 38 via bearings 36 and 37.
The power take-off shaft 35 is rotatably supported by the input shaft 10, and the power take-off shaft 35 is disposed on the same axis as the input shaft 10 and on opposite sides in the front and rear. The power take-off shaft 35 is a bevel gear 3
9, whose bevel gear 39 is engaged with the bevel gears 20 and 21. A protective cover 40 is removably attached to cover the power extraction shaft 35 when there is no need to extract power from it. On the inner end surfaces of the input shaft 10 and the power take-off shaft 35, a truncated conical resistor 41 that matches the conical surface of the base cone of the bevel gears 14, 39 is provided.
42 are attached on the same axis by bolts 43 and 44. Note that the resistors 41 and 42 are made of metal. On the other hand, on the inner surfaces of the bevel gears 20 and 21, resistors 45 and 46 made of an elastic material such as rubber and formed to be slightly larger than the base cone of the bevel gears 20 and 21 fit into the boss parts 22 and 23. It is installed as follows. These resistors 41 and 42 and resistors 45 and 46 are in elastic contact with each other, and the bevel gears 14, 39 and 2
It is possible to roll together with 0 and 21.

Next, the effect will be explained. FIG. 3 shows a state in which the shifter 29 is located at a neutral position, at which time the spline portion 30 of the shifter 29 is not fitted into either of the bevel gears 20, 21. Therefore, for example, when plowing by the down cut method with the claw shaft 7 rotated forward, if the operating lever 34 is rotated around the rotation shaft 33 from the neutral position to the forward rotation position,
The shifter 29 slides in the direction of arrow a through the engagement member 32, and the spline portion 30 engages the bevel gear 20.
Because it fits into the spline hole 24 of the input shaft 10
The power is transmitted to the transmission shaft 26 via the bevel gear 14, the bevel gear 20, and the shifter 29, thereby driving the pawl shaft 7 in normal rotation.

When the rotary device 4 is raised during driving in such a state and inconstant velocity movement occurs in the universal joint shaft 6, uneven rotation appears on the bevel gear 14 of the input shaft 10, and in the conventional case, four bevel gears 14 ,2
0, 21, and 39, particularly the bevel gears 23 and 39 side that are in an idle state, have a problem in that abnormal noises are generated. However, since resistors 41 and 42 are provided on the bevel gears 14 and 39, and elastic resistors 45 and 46 are provided on the bevel gears 20 and 21, and these are in pressure contact and rotate, the bevel gear 14 has uneven rotation. Even if this occurs, the bevel gears 20, 21, and 39 on the driven side will not wobble in the rotational direction, and the generation of abnormal noise can be prevented.
Therefore, damage to the tooth surfaces of the bevel gears 14, 20, 21, 39 is also reduced. Also, resistors 41, 42,
45, 46 are bevel gears 14, 20, 21, 3
9, one of the resistors 41,
42 is fixed with bolts 43, 44, and the other resistor 45, 46 is fitted into the boss portions 22, 23, so assembly is easier than in the case where all are fixed. Note that the resistors 41 and 42 may also be made of an elastic body, and a protrusion may be provided at the end of the shaft and fitted into the protrusion.

Fig. 3 shows the case where the resistors 41, 42 and 45, 46 roll into contact, but as shown in Fig. 4, the contact area between the resistors 41, 42 and 45, 46 is viewed from the base conical surface. It is also possible to transpose them, and in this way, the resistors 41, 42 and 45, 46 can be used in a sliding contact state, and the same effect as described above can be achieved.

Further, the resistors 41 and 42 may be formed integrally with the shafts 10 and 35 and the bevel gears 14 and 39, as shown in FIG.

FIG. 6 shows that the bevel gears 14 and 21 are integrally formed with conical parts 47 and 48.
A band-shaped resistor 41, 4 made of rubber or the like is attached to the outer peripheral surface of the
6 is installed, and the same noise prevention effect can be obtained with this as well.

In addition, in the embodiment, a forward/reverse rotary device 4 which is capable of forward and reverse rotation and from which power can be taken out has been described as an interlocking type of four bevel gears 14, 20, 21, 39. In this case, a combination of three bevel gears may be used, and in a case where only forward rotation is possible, a combination of two bevel gears may be used, and the same implementation is possible in those cases as well. It goes without saying that the present invention can also be implemented in devices other than rotary devices.

In the present invention, resistors that contact each other and rotate together with the bevel gears are provided on the intersecting direction sides of the bevel gears that engage with each other, and at least one of these resistors is made of an elastic body, so that the unbalanced joint axis can be adjusted. It is possible to prevent the occurrence of abnormal noise caused by uneven rotation due to high-speed motion, and also to prevent damage to the tooth surface of the bevel gear. Furthermore, since the resistor is located on the side in the cross direction of the bevel gear, assembly is easy and does not cause any particular trouble.

[Brief explanation of the drawing]

Figure 1 is a side view showing one embodiment of the present invention;
The figure is a cross-sectional side view of the same gear case, FIG. 3 is a cross-sectional plan view thereof, FIGS. 4 and 5 are cross-sectional plan views showing another embodiment, and FIG. 6 is a main part showing another embodiment. FIG. 6... Universal joint shaft, 10... Input shaft, 14, 2
0, 21, 39... Bevel gear, 26... Transmission shaft, 35... Power take-off shaft, 41, 42, 45, 4
6...Resistor.

Claims (1)

[Scope of utility model registration request] In a power transmission device in which required parts are driven by power from a universal joint shaft through at least two bevel gears that mesh with each other, the bevel gears are arranged on the cross direction sides of the bevel gears, contacting each other and rotating integrally with the bevel gears. 1. An abnormal noise prevention device for a power transmission device, characterized in that a resistor is provided, and at least one of the resistors is made of an elastic body.