JPS5817814Y2 - Brake device for swing transmission in earth-moving machines such as excavators - Google Patents

Description

[Detailed explanation of the invention] The standard transmission device used in excavation machines is a gear train for reduction driven by a motor and a fixed ring gear that rotates to selectively move the upper unit (swivel part) on the traveling gear. It consists of a swing pinion (swivel pinion) for rotation.

Brakes are used to secure the upper unit to the traveling gear during excavation, allowing the operator to excavate in a straight line with standard earthmoving equipment attached to the upper unit.

The above-mentioned brake may also have the function of preventing the upper unit from rotating in order to keep the vehicle parked when the vehicle is not being driven.

Conventional brake assemblies are typically embedded within the transmission, making them difficult to access and making repairs and inspections difficult.

Another problem is that a large braking capacity is required since the braking force is normally applied to the transmission.

The present invention has been devised to solve the above-mentioned problems by providing a compact and easily repairable brake assembly particularly suitable for use in earth-moving machines such as excavators. , the brake (mechanism) of the brake assembly of the present invention has a spline connection part that separably connects the output shaft of the drive motor and the input shaft of a transmission device suitable for rotating the upper unit with respect to the traveling device. Be prepared.

The output shaft of the drive motor and the input shaft of the transmission are arranged on the same vertically extending axis, so that the coupling member with the splined connection also extends vertically.

Connecting the output shaft of the drive motor and the input shaft of the transmission with a spline connection makes it possible to easily separate the output shaft of the drive motor from the input shaft of the transmission, thereby making it possible to easily separate the output shaft of the drive motor from the input shaft of the transmission. To enable a brake device incorporated in a member to be removed for repair, inspection, etc.

This is extremely advantageous for earth-moving machines such as large excavators.

The fact that the brake mechanism is provided on a connecting member having a vertically extending spline connecting portion has the advantage that when a braking force is applied to the connecting member, it is gravitational balanced and does not cause an unbalanced load.

The present invention also provides a lubrication system including a pump driven by the input shaft to send lubricating oil through a channel provided in the input shaft to a spline connection connecting the output shaft and the input shaft.

Adequate lubrication of the spline connection between the output shaft of the drive motor and the power shaft of the transmission is important for the removal of the brake system.

If the lubrication is not good, the connecting parts will become caked with rust, making it difficult to remove the brake device.

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

FIG. 1 shows an earth-moving machine 10, such as an excavating machine, which includes a traveling device 12 with a crawler track and an upper unit (swivel section) 11 mounted so as to be able to pivot thereon.

The upper unit 11 includes a driver's seat 13 and a power unit 14 installed on a common frame 15.

An annular turntable 16 is attached to the lower part of the frame 15.

A brake 17 (partially shown in the figure) is rotatably mounted on the front end of the upper unit 11, and standard earthmoving equipment can be attached to the boom. .

The upper unit 11 is connected by a removable transmission device 19.
The traveling device can be selectively rotated on the base 18.

As seen in FIG. 2, the transmission device 19 is for transmitting power from the input shaft 20 to the swinging pinion 21, and includes a pinion 19a fixed to the input shaft 20, a pinion 1
Gear 19b meshing with 9a, pinion 19C coaxial with gear 19b, gear 19d coaxial with pinion 19C
, pinion 19e coaxial with gear 19d, pinion 19
The swing shaft 19g connects the gear 19f and the swing pinion 21.

The swing pinion 21 meshes with a reaction type ring gear 22 fixed to the base 18.
When rotation is transmitted to the ring gear 22, it swings along the inside of the ring gear 22.

The swing shaft 19g is connected to the housing 1 fixed to the turntable 16 via a suitable bearing (not shown).
It is supported by a sleeve bush 19h attached to 6a.

The turntable 16 is attached to the ring gear 18 via a ball bearing 16b so that it can rotate around the central axis of the ring gear 18.

Therefore, when the swing pinion 21 rotates and moves along the inner circumference of the ring gear 18, the turntable 16 connected to the swing pinion 21 rotates around the ring gear 18.

The construction of such a transmission device itself is well known, as shown for example in US Pat. No. 3,739,652.

A reversible hydraulic motor 23 operated by a driver includes an output shaft 24 extending downward.

The hydraulic motor housing is attached to the cover 2 by bolts 26.
The cover 25 is removably attached to the bolt 2.
8, it is also detachably attached to the case 27 of the transmission device.

A brake assembly 29 is installed between the output shaft 24 of the hydraulic motor 23 and the transmission device 19, and normally operates to prevent the swing pinion 21 from rotating.

The brake assembly 29 includes an annular housing 30 removably attached to the upper unit transmission case 27.

Further, the upper end of the input shaft 20 is rotatably attached to the brake assembly 29 via an annular bearing 31.

Connecting member 32 is also a component of the assembly and includes a sleeve portion 33 that removably connects concentrically disposed input shaft 20 and output shaft 24 by a shared spline connection 34.

An annular seal 35 provided between the sleeve portion 33 and the housing 30 and an annular seal 36 provided between the output shaft 24 and the sleeve portion 33 prevent lubricating oil from flowing into the dry brake chamber. It forms a sealing means to prevent

The connecting member 32 includes an annular drum portion 37 that constitutes a part of the brake mechanism.

This drum portion 37 surrounds the sleeve 33.

The braking mechanism also includes an expandable brake shoe 38 attached to the housing 30 in the usual manner (typically similar to well-known vehicle wheel brakes) and typically expanded outward in the radial direction. Frictional contact with the drum portion 37 prevents the coupling member 32 from rotating.

The brake shoe 38 includes conventional control means and linkage means (
(not shown in the figure) is connected, and when the swing pinion 21 is rotated, the brake shoe 38 is selectively retracted to release the connecting member 32 and the output shaft 24 of the motor is used to input the transmission device. It is adapted to rotate around a shaft 20 (FIG. 2).

It is desirable to provide a lubricating means for feeding lubricating oil into the interior of the sleeve portion 33 of the connecting member 32 to continuously lubricate the spline connecting portion 34.

This lubrication means can be formed by a standard pump 39 connected to the lower end of the input shaft 20 and a passage 40 extending through the manpower shaft to near the end of the output shaft 24.

After exiting the flow path, the lubricating oil flows along the spline connection 34 and then through the opening 4 provided through the sleeve portion 33.
1 to lubricate the annular bearing 31.

Brake shoe 38 works best when it is dry, so
It is important that the annular seals 35, 35 prevent lubricating oil from entering there.

In addition, a conduit 42 is provided in the lubricating means to supply lubricating oil to the pump 3.
9 to an annular bearing 43.

This bearing 43 is rotatably attached to the upper end of the shaft 44 of the gear train within the case 27 of the transmission device.

FIG. 3 shows another embodiment of the brake assembly.

The brake assembly consists of a brake mechanism with a sleeve-shaped coupling member 51 connecting the output shaft 24 of the motor and the input shaft 20 of the transmission with a common spline connection 52.

The brake mechanism also includes a first set of friction wheels 53 splined to the sleeve at 54 for axial movement.

An annular housing 5 attached to the transmission case 27
A second set of friction discs 55 are spline-coupled at positions 56 to 7, and are alternately stacked on top of the first friction disc in a sandwiched manner.

Between the housing and the friction disc there is a spring 58, preferably back-to-back bevel-shaped spring washers, as a means of activating the brake, which normally pressurizes the disc so that the coupling member 51 does not rotate.

A piston 59 is installed in the housing so as to be able to reciprocate, and when the inside of the working chamber 60 is pressurized through a conduit 61 that communicates with a hydraulic pressure regulating conduit operated by the driver, it moves downward. It's supposed to move.

As the piston moves downward, the pressure plate of the sleeve 62 also moves downward and compresses the spring, thereby releasing the braking means.

Then, as described above, the input shaft 20 of the transmission device is freely rotated by the output shaft 24 of the motor.

The embodiment shown in FIG. 3 described above is particularly suitable for integration into earth-moving machines such as excavation mechanisms, which are the object of the present invention, and is easy to disassemble, making it easy to repair and inspect the brake device of the connecting member. It has characteristics.

[Brief explanation of the drawing]

Fig. 1 is a partial side view of an excavation machine showing the general positional relationship of a swing transmission device driven by a motor, and Fig. 2 is an enlarged side view of the swing transmission device driven by a motor, and shows a brake assembly according to the present invention. Partially cut away for illustration. FIG. 3 is an enlarged sectional view of another embodiment of the brake assembly of the present invention. 10... Earthmoving machine, 11... Upper unit, 12... Travel device, 19... Transmission device, 20... Input shaft, 23...hydraulic motor, 24...output shaft, 29...
Brake assembly, 32.51... Connection member, 3
4, 52... Spline connection body, 53...
...First friction disk, 55...Second friction disk, 57...Housing, 58...
... Spring, 59 ... Pressing sleeve drive piston, 62 ... Friction disk pressing sleeve.

Claims (1)

[Scope of utility model registration request] A swing transmission device having an input shaft, a motor having an output shaft, a connecting member that connects the input shaft and the output shaft in a separable manner, a brake mechanism for selectively stopping rotation of the connecting member, and an upper part. unit, a chassis and a mechanism for pivotally supporting the upper unit on the chassis, the input shaft and the output shaft are arranged on the same vertically extending axis, and the connecting member has a common spline connection. connected to the input shaft and the output shaft by a portion,
The swing transmission, the motor, and the brake mechanism are mounted on the upper unit, and further includes a lubricating means for sending lubricating oil to the connection between the input shaft and the output shaft inside the connection member. a pump coupled to the input shaft such that the lubricating means is driven by the input shaft; and a flow formed in the input shaft for delivering lubricating oil into the interior of the coupling member. A brake device for a swing transmission in an earth-moving machine such as an excavating machine.