JPS5828060Y2 - Gear change operation structure of rotating work vehicle - Google Patents

Description

[Detailed Description of the Invention] The present invention includes a swivel base that is freely rotatable around a vertical axis attached to a traveling vehicle body via a rotary joint, and a fluid pressure motor driven by a fluid pressure pump mounted on the swivel base. ,
The present invention relates to a speed change operation structure for a swing-type work vehicle, which is connected in conjunction with a hydraulically operated transmission attached to the traveling vehicle body, and configured so that the speed change of the speed change device is performed by an operating tool on the swivel base.

In the above-mentioned speed change operation structure, conventionally, a plurality of speed change operation actuators are provided for the speed change device on the side of the traveling vehicle.

-The system uses a system in which the motor is operated from the swivel base side using fluid pressure control, but two flow paths are provided for each actuator for speed change operation, that is, twice the number of flow paths as the number of actuators for speed change operation. It has to be provided at the rotary joint, which makes the joint structure complicated, making it difficult to manufacture and increasing costs.

In view of the above-mentioned circumstances, the present invention aims to eliminate the above-mentioned drawbacks through a simple structural improvement. A pump for supplying an operating actuator is interlocked and connected to a constantly rotating shaft of a transmission, and a valve for selectively supplying oil from the pump to the actuator is provided on the vehicle body side, and the operating tool and the valve are provided. are interlocked and connected via one sliding operating lever passing through the center hole of the rotary joint.

In other words, by attaching a pump to the constantly rotating shaft on the side of the running vehicle, a pressure fluid supply source is configured for the actuator for shifting operation, and by having the valves for the plurality of actuators be operated by one operation rod, one By simply forming a hole for the operating rod in the rotary joint, multiple gear shifting operations for the transmission on the vehicle body can be performed from the swivel base side without complicating the rotary joint.
Overall, it has become possible to construct a rotary joint with an extremely simple structure and at low cost in an apparatus in which the actuator for shifting gears is substantially controlled by fluid pressure.

Next, embodiments of the present invention will be described based on illustrative drawings.

A swivel base 4 is attached to a vehicle body 2 equipped with a tire-type traveling device 1 so as to be rotatable around a vertical axis via a joint 3, and a bracket 9 is provided on the swivel base 4 so as to be slidable and fixed in the horizontal direction. Also, an excavation work device A consisting of a boom 5, an arm 6, a packet 7, and a fluid pressure cylinder 8 that drives and oscillates them around a horizontal axis.
is attached to the sliding bracket 9, and a control section 10 and an engine section 11 are mounted on the swivel base 4 to constitute a swivel type work vehicle.

To configure the drive mechanism of the traveling device 1, a fluid pressure operated transmission 12 with a fluid pressure motor M interlocked therewith is attached to the traveling vehicle body 2, and a fluid pressure pump P mounted on the swivel base 4 and the motor M are connected to each other. A valve V for forward and reverse operation of the motor M is connected to the rotary joint 3 by a flow path a, l) passing through the rotary joint 3, and a valve V for forward and reverse operation of the motor M is interposed on the swivel table side of the flow path a, l). The differential device 13.13 of the front and rear axles and the variable speed output shaft 14 are connected to the transmission shaft 15.1.
It is interlocked and connected by 5.

To configure the fluid pressure operated transmission 12, the input shaft 16 connecting the motor M, the transmission output shaft 14, and two intermediate shafts 17.18 are installed in the transmission case 19, and the intermediate shafts 17.18 gear G1 attached to the input shaft 16, respectively.
Gear G2 with a different number of teeth that constantly engages with G2. G3 is fixedly installed, and two gears G4. with different numbers of teeth are installed. G5, G6. G
7 are loosely fitted onto each of the intermediate shafts 17, 18, and the gears G4. G5, G6yG7 are configured to rotate integrally with the intermediate shaft 17°18, and the gear G4 of the intermediate shaft 17.18
．． G6, and gear G5. Gear G8 that engages both G7
．． G, is fixed to the output shaft 14.

To configure the operating structure for the transmission 12, a pump P1 is interlocked and connected to the constantly rotating shaft 16 of the transmission 12, and a suction filter 21 is positioned between the gear G809 attached to the output shaft 14. This filter 21
is connected to the pump P1, and the speed change operation actuator 20 is connected to the discharge path of the pump P1.
A push-pull operation type valve ■1 that sequentially operates the valve ■1 is installed, and the return flow path of the valve ■1 is connected to the case 1.
9 and is attached to the transmission case 19, and the lubricating oil in the transmission case 19 is used as operating oil to enable stopping and four-speed gear shifting operations by operating the valve (1) on the traveling vehicle body 2 side. Then, a sliding operating rod 23 equipped with a mechanism 22 for allowing relative rotation of the swivel base 4 with respect to the traveling vehicle body 2 is disposed to penetrate through the center hole 24 of the rotary joint 3, and the lower end thereof is connected to the valve (1). , are connected by a bell crank 25, and an operating tool 26 attached to the swivel base 4 and the upper end of the operating rod are connected by a link 27 and a bell crank 28, thereby connecting the transmission 12 attached to the traveling vehicle body 2.
Rotary joint 3
It can be operated from the swivel base 4 side via a single sliding operation lever 23 passing through.

It should be noted that the fluid pressure transmission structure or the configuration of the number of gears of the transmission 12 can be modified in various ways, and the mechanism for connecting the valve 1 and the operating tool 26 to the sliding operating rod 23 can also be modified in various ways. It is.

Further, the pump P1 for the actuator units 20 may be interlocked and connected to a constantly rotating intermediate shaft 17 or 18 other than the input shaft 16.

[Brief explanation of the drawing]

The drawings illustrate an embodiment of the speed change operation structure for a swing type work vehicle according to the present invention, Figure 1 is an overall side view of the swing type work vehicle, Figure 2 is a schematic system diagram of the speed change operation structure, and Figure i is a general side view of the swing type work vehicle. Figure 3 is a system diagram of the transmission. 2... Traveling vehicle body, 3... Rotary joint, 4... Swivel base, 12... Fluid pressure operated transmission, 16...・Constantly rotating axis, 2
0... Actuator for speed change operation, 23...
...Sliding operation rod, 24 ... Center hole, 26
......Operation tool, M...Motor, P, P
,······pump.

Claims (1)

[Scope of utility model registration request] A swivel base 4 rotatable around a vertical axis is attached to the traveling vehicle body 2 via a rotary joint 3, and a fluid pressure motor M is driven by a fluid pressure pump P mounted on the swivel base 4.
A hydraulically operated transmission 12 attached to the traveling vehicle body 2
This is a speed change operation structure for a swing-type work vehicle, in which the speed change device 12 is configured to be gear-changed and operated by an operating tool 26 on the swivel table side, and the speed change operation structure is configured such that a plurality of oils in the case of the speed change device 12 are connected to each other. Actuator 2 for speed change operation
A pump P1 that supplies 0... is interlocked and connected to the constantly rotating shaft 16 of the transmission 12, and the pump P1
The oil from the actuator 20...
, a valve ■1 is provided on the traveling vehicle body side, and
A speed change operation for a swing-type work vehicle, characterized in that the operating tool 26 and the valve 1 are interlocked and connected via one sliding operating rod 23 passing through the center hole 24 of the rotary joint 3. structure.