JPS609931B2 - Tractor torque limit device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a torque limit device for a tractor.
By interposing it in the middle of the power transmission shaft of the system, when excessive torque is applied to the power transmission ball, it can be appropriately released, thereby ensuring the safety of each part of the fuselage.

Tractors are generally equipped with a main clutch that connects and disconnects power transmission from the drive system and PTO system all at once. There are almost no torque limit clutch mechanisms in sight.

Without such a clutch mechanism, it would be impossible to disconnect only the power transmission to the drive system, for example to drive the work equipment while the tractor body is stopped, or when excessive torque is applied to the work equipment, it would be impossible to disconnect the power transmission from the PTO. This causes problems such as not being able to disconnect the system power transmission shaft so as to release it, leading to damage to various parts of the tractor body.The present invention solves this problem by installing a clutch mechanism for torque limit with a simple configuration. This solution solves the problem, and as a torque limit device of the tractor, it is installed in the middle of the power transmission shaft of the t-travel system or PTO system, separately from the main clutch that connects and disconnects the power transmission of the t-travel system and the PTO system. This is a tractor torque limit device that cuts off power transmission in the event of excessive torque.
They are iron-coupled so that they can rotate freely relative to each other and the driving shaft side can move in the rutting line direction. A receiving body and a pressing body are provided, and a bearing supporting the turbulence shaft on the fixed side is attached to a mantle that can freely slide in the axial direction on the driving shaft on the opposite side of the driven shaft with respect to the pressing body. A spring that biases the disk in the direction of fall pressure is driven between the bearing and the pressing body. An adjustment nut that adjusts the spring pressure of the spring is also driven on the bag so that the bearing is sandwiched between the spring and the spring. The present invention is characterized in that a shift fork is screwed onto the shaft and engaged in a circumferential groove on the outer periphery of the pressing body for manually operating the pressing body in the clutch disengaging direction against the back. To specifically explain the present invention by taking an example, the mechanism represented by the transmission case of the Kawama truck in Figure 2 is rotatably installed via the Kawama truck bearing 3. Even though the driving shaft 4 is a fixed shaft that is rotatably installed on the shaft with a bearing, the driving shaft and the shaft 4 can play in a cannular shape through the push shaft. Accordingly, the driving shaft 2 is set to be able to move along the direction of the driving shaft relative to the driven shaft.

A spline engraved on the rudder drive shaft 2 ~ the spline? There are multiple motive disk fins that can slide along the motive shaft. Reference numeral 9 denotes a receiver for supporting the end face of the driving disk at the end of the driving shaft 2, and like the disk, it has the above-mentioned spline. The train is being used to play.

It is a split collar that prevents the tatami skin from falling out along the bag line direction of the receiver sardine, and is fitted into the concave circumferential groove formed at the end of the drive shaft 2 to prevent the h drive shaft from falling out. It is fixed integrally with the shaft 2. In addition, ``12'' is a pressing body which is connected to the spline on the drive shaft so as to sandwich the drive disk in place of the above-mentioned receiver crane. Clutch lever supported in a suitable manner...A shift fork turtle 5 that can be engaged with the end of the bar shaft 3 and the concave groove of the pressing weight 2 by the rotation operation of the force.
The drive shaft 2 is slid on the drive shaft 2 via the drive shaft 2.

This is a spline carved into the end of the driven shaft 4, and the spline group 61 is formed by ironing the base of the clutch case, which covers the whole of the driving disk. The case mechanism and the driven shaft 4 are designed to rotate together.A plurality of driven disks protrude from the clutch case mechanism and intervene between the adjacent clutch disks. This forms a multi-plate friction clutch mechanism.A predetermined number of free irons are placed on the driving shaft 2 between the bearing 3, which is to support the driving shaft, and the pressing body. This is a disc spring that sets the upper clutch machine in the clutch-on state at all times even though it is always biased to push the pressing body in the right direction of the intended direction, which prevents the engine from making noise. The power is transmitted to the auxiliary shaft.It is an adjustment nut that is screwed together with the driving shaft. They are arranged so as to sandwich the bearings between them, and as will be described later, the driving shaft harp is operated in a circular motion in order to adjust the torque limit in advance.

In the above mechanism, the clutch mechanism interposed between the driving shaft 2 and the driven shaft turtle is normally set in the clutch-on state as shown in the figure. Only when the taratch-off state is obtained, the taratch lever of the first Maizu ~ Tomokame is rotated, but this forcibly compresses the disk spring Furei and moves the shifter Fumin on the spline lightning of the driving shaft Tsuru to the left of the first Tomizu. It will be discussed.

``In order to automatically prevent excessive torque from being transmitted from the driving shaft to the driven shaft register and vice versa from the driven shaft turtle to the driving shaft window when the clutch is on, the above-mentioned clutch mechanism When using this as a torque limiter, operate the two adjustment nuts mentioned above as follows.In other words, move the adjustment nut 2, which is fitted with the motorized wisteria crab, toward the left in Fig. If you rotate it like a fly, the driving shaft will move relative to this in the right direction in the same figure along its axis, and this will cause the support bearing a of the driving rutting ink and the pressing body penetrating cod to move. The opposing gap between the disk spring 9' and the disk spring 9' becomes large, and therefore the disk spring electric katsu inserted in the gap is automatically expanded. Since the pressing force of the adjusting nut 20 is weakened, the pressing force of the disc spring 19 is adjusted in response to the degree of screwing of the adjustment nut 20, and the degree of excessive torque is adjusted in advance in anticipation of the degree of excessive torque acting. This means that the clutch mechanism can be set to automatically maintain the clutch-off state.

In other words, by performing such adjustment operations, the clutch mechanism described above can be used as a torque limiter. Figure 3 shows a schematic example of a transmission mechanism in a tractor. , 21 is the engine mounted on the aircraft, 22 is its crankshaft, 23 is the flywheel, 24 is the main clutch, 25 is the main shaft that is the input shaft for the power transmitted via the closing clutch 24, and 26 and 27 are the main shafts. The upper transmission gear for traveling and the lower PTO are mounted parallel to the main shaft 25.
The main transmission mechanism A for traveling uses selective gear meshing between the traveling transmission shaft 26 and the main shaft 25, and the same selective gear meshing between the PTO shaft 27 and the main shaft 25. A PTO transmission mechanism B is formed according to the above.

28' is the final reduction shaft installed between the traveling speed change 26 and the PTO shaft 27, and the differential gear 2 is connected to the differential gear 2 through the bevel pinion.
9, and a traveling sub-transmission mechanism C formed by selective gear engagement is formed between the traveling transmission shaft 26 and the traveling transmission shaft 26.

1 and 2, the traveling shaft 26 is connected to the traveling main transmission shaft 30 in the middle of the traveling transmission shaft 26 in FIG. 3.
Separately formed into the clutch shaft and the auxiliary transmission shaft for traveling,
Since this represents a system in which an entrusted torque-limiting clutch mechanism is interposed between the clutch shaft and the traveling auxiliary transmission shaft, the above-mentioned driving ball 2 is the clutch core in this embodiment. The driven shaft 4 also corresponds to the auxiliary transmission shaft for traveling, and can also be said to be the transmission case, but the torque limit clutch mechanism as described above can be used as a transmission case as shown in Fig. 3. It may be interposed in the same machine in the middle of the PTO shaft 27 of the mechanism.

In FIG. 1, a coupling 31 is inserted between the clutch shaft related to the driving shaft 2 and the main transmission shaft 30 for driving while leaving a certain gap to allow movement of the clutch shaft along the axial direction. They are connected so that they can rotate together. Also, bell 1
It is convenient for maintenance and inspection to divide the transmission case (transmission case) into parts corresponding to the intervening parts of the clutch mechanism as shown in the first figure. According to the configuration of the present invention shown in the above embodiment, in addition to the main clutch 24 that connects and disconnects the power transmission of the travel system and the PTO system, the clutch 24 is interposed in the middle of the power transmission shaft of the travel system or the PrO system, and is used to generate power when excessive torque is applied. A torque limit device for a tractor configured to disconnect transmission, in which opposing ends of a driving shaft 2 and a driven shaft 4 are joined so that they are relatively rotatable and the driving shaft 2 side can move in the direction of the track line. A receiver 9 and a pressing body 12 are provided on the drive shaft 2 so as to sandwich the drive disk 8 provided on the drive shaft 2 and the driven disk 18 provided on the clutch case wing 7 on the driven shaft 4 side. A bearing 3 that supports the shaft 2 on the fixed side is slidably mounted on the driving shaft 2 in the flywheel direction on the opposite side of the driven track 4 with respect to the pressing body 12. A spring 19 that biases the bearing 3 is placed on the drive shaft 2 between the bearing 3 and the pressing body 12, and an adjustment nut 20 that adjusts the spring pressure of the spring 19 is placed on the drive shaft 2 between the spring 19 and the bearing 3.
A shift fork 15 for manually operating the pressing body 12 in the clutch disengaging direction against the spring 19 is engaged in a connecting groove on the outer periphery of the pressing body 12. As a result, the defects mentioned at the beginning are eliminated, and the power transmission of the traveling system or PTO system can be disconnected individually, making it possible to ensure the safety of each part of the tractor body when excessive torque is applied. Moreover, since the overall configuration is simplified, it is extremely advantageous in practical terms in that it can be provided at low cost.

That is, the driving dovetail 2 is made to be able to slide freely in the axial direction with respect to the bearing 3, the adjusting nut 20 is screwed onto the driving shaft 2, and the driving shaft 2 is moved in the axial direction by operating the adjusting nut 20. Since the spring pressure of the spring 19 is adjusted by
The structure is simple and compact, and the torque can be easily adjusted. Moreover, the opposing ends of the drive shaft 2 and the driven shaft 4 are iron-coupled to allow relative rotation between the two, and also to allow the drive shaft 2 to move in the axial direction. Although the drive shaft 2 is screwed onto the drive shaft 2 to adjust the torque, it is possible to prevent the shaft runout of the drive shaft 2. Further, the shifter fork 15 is engaged with the same groove of the pressing body 12 for pinching the discs 8 and 18 by the spring pressure, and the pressing body 12 is manually operated in the clutch disengaging direction against the spring 19. ``Using the clutch mechanism for torque limit, power can be switched on and off by manual operation.Therefore, it can be used for both torque limit and manual use, which is advantageous in terms of structure. , it is effective and can be implemented at low cost.

[Brief explanation of drawings]

The drawings show a preferred embodiment of the present invention. ``Figure 1 is a cross-sectional view of the main part showing the case where it is interposed in the middle of the traveling speed change shaft, Figure 2 is a cross-sectional view of the operating system of the pressing body, Fig. 3 is an overall schematic explanatory diagram of an example of a transmission mechanism. 2...--driving ball (clutch shaft), 4... driven ball (driving shaft), 8... driving disc 10...・・Appearance U color t 12・・・・Pushing body is also 14・・・Clutch lever m」 15……Shift fork, 17……Clutch case, Wing day……Driven disc, 19…… Disc spring,
20...Adjusting nut 24...Main clutch also 25...Main shaft.26...Transmission gear 27...PTO shaft. Fig. 1 Fig. 2 Fig. 3

Claims (1)

[Claims] 1. A tractor torque limit device that is installed in the middle of the power transmission shaft of the travel system or PTO system, in addition to the main clutch 24 that interrupts power transmission between the travel system and the PTO system, and is configured to disconnect power transmission in the event of excessive torque. There it is,
The opposing ends of the driving shaft 2 and the driven shaft 4 are fitted so that they are relatively rotatable and the driving shaft 2 side can move in the axial direction,
A receiver 9 and a pressing body 12 are provided on the driving shaft 2 so as to sandwich the driving disk 8 provided on the driving shaft 2 and the driven disk 18 provided on the clutch case 17 on the driven shaft 4 side. A bearing 3 supporting the fixed side is fitted onto the driving shaft 2 on the side opposite to the driven shaft 4 with respect to the pressing body 12 so as to be slidable in the axial direction, and the pressing body 12 is biased in the disk clamping direction. A spring 19 is fitted onto the drive shaft 2 between the bearing 3 and the pressing body 12, and an adjusting nut 20 for adjusting the spring pressure of the spring 19 is driven so as to sandwich the bearing 3 between the spring 19 and the spring 19. A spring 19 is screwed onto the shaft 2, and the pressing body 12 is fitted into a circumferential groove on the outer periphery of the pressing body 12.
A torque limit device for a tractor, characterized in that a shift fork 16 is engaged for manually operating a clutch in a direction of disengaging the clutch.