JPH0692663B2 - Revolving structure drive - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a construction machine, and more particularly to a revolving structure drive device for a micro construction machine.

2. Description of the Related Art As a typical example of the above-described swing structure drive device, a swing structure drive device for a hydraulic excavator will be described. It is as shown in FIG. 4, 1 is a revolving structure (fixed part), 2
Is a fixed part (revolving body) attached to a running body (not shown),
Reference numeral 3 denotes a revolving structure drive device attached to the revolving structure 1.
A drive motor is housed inside, 4 is a pinion attached to the output shaft of the drive device 5, 5 is a rotating outer wheel attached to the revolving structure 1, and 6 is an inner rotating wheel attached to the fixed portion 2. It has an internal gear that meshes with the pinion 4 on its circumference,
Is a support provided on the fixed part 2, and 8 is a rotary joint supported by a box-shaped body 9 provided on the support 7. The joint 8 is supplied with hydraulic pressure from a hydraulic source (not shown) and fixed. Allocate to all actuators.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention Since the revolving structure drive device 3 as described above is configured as described above, when installing the revolving structure drive device 3 in the construction machine, fluid is supplied from the hydraulic pressure source to the fixed part actuator. Therefore, the rotary joint 8 required for this purpose must be formed separately from the drive unit 3 and installed in different places, so that a large installation space is required, and the pinion 4 that meshes with the internal gear has a large size. Since the radial load is applied, the pinion 4 bends, which not only reduces the mechanical efficiency but also causes a large noise.
Further, since the durability of both gears is deteriorated, there are various problems such as the need for grease-up maintenance for gear lubrication.

Therefore, an object of the present invention is to improve performance and reduce noise generation without requiring a large space for installing members, unlike the conventional one, to improve durability and reduce maintenance labor. A revolving structure drive device capable of performing the above is provided.

Means for Solving the Problems A drive motor installed in a casing, and an output member installed in the casing on the same axis as the drive motor and rotated by the drive motor installed in the casing, The casing is provided with a fluid port connected to a hydraulic pressure source, and the output member is provided with a communication passage having one end communicating with the fluid port and the other end having a fluid port opening to the outside of the output member. The torque of the output member is directly transmitted to the casing.

Action In the above device, the casing 11 is attached to the revolving structure (or fixed part) 1 as shown in FIG. 2, and the output member 14 is attached to the fixed part (or revolving structure) 2.
When the drive motor 13 is actuated, the output member 14 is rotated to cause relative rotational movement between the revolving structure and the fixed structure, and the pressure oil circulated in the casing 12 through the fluid port 15 is generated in the output member 14. The fluid port 17 communicates with a fixed portion actuator (not shown) through the communication passage 16, and the fixed portion actuator performs a required operation. As can be seen from this, in this drive device 11, the drive motor 13 and the output member 14 are housed in one casing 12, and the casing 12 and the output member 14 also constitute a rotary joint. The whole becomes compact.

Embodiment In the first embodiment shown in FIG. 1, the drive motor 13 and the output member 14 are connected via a reduction mechanism 18, and this reduction mechanism is used.
The pinion 20 is attached to the output shaft 19 of the drive motor 13 installed at the upper part of the casing 12, and the first intermediate gear 21 meshing with the pinion 20 is an internal gear provided on the inner peripheral surface of the upper part of the casing 2. It meshes with 22. The intermediate gear 21 is rotatably supported by a support shaft provided on an upper portion of a disk-shaped first support body 23, and an internal gear continuing to the center hole of the support body 23 is rotatable on the top of the output member 14. Is engaged with the upper portion of a cylindrical gear 24 supported by the above, the lower portion of this cylindrical gear 24 is engaged with a second intermediate gear 25 which is meshed with the internal gear 22, and this intermediate gear 25 is attached to the upper portion of the output member 14. It is rotatably supported by a support shaft provided on the upper portion of the disk-shaped second support body 26.

The output member 14 is provided with a ring groove 27 at a position facing the fluid port 15 and the communication passage 16, a flange 28 for attaching to the revolving unit 1 is provided at the lower portion of the casing 12, and a lower portion of the output member 14 is provided. Is a fixed part and a mounting flange 29
Is installed.

Such a drive unit 11 is shown in FIG. 2 and is used as described above.
In this case, the operation of the drive motor 13 causes the reduction mechanism 18
The output member 14 is rotated via the output member 14, and the torque generated in the output member 14 at this time becomes the torque required to rotate the revolving unit 1 or 2 in FIG. At this time, irrespective of the rotation of the output member 14, the pressure oil is circulated between the fixed portion actuator (not shown) and the hydraulic pressure source through the fluid ports 15 and 17 and the communication passage 16, and serves as a rotary joint. Will be fulfilled.

FIG. 3 shows a second embodiment of the present invention.

This embodiment will be described in the same manner as the second embodiment.
The drive motor 13 'in this case is housed in the casing 12 ", and is composed of a swash plate hydraulic motor including a swash plate member 33 installed in the casing 12" and a moving member 34 attached to the output member 14. In the point that it is different, it is different from the first embodiment and the other is the same.

In each of the above embodiments, the drive motors 13 and 13 'may be of any type such as an electric motor or a hydraulic motor.

EFFECTS OF THE INVENTION The present invention is as described above, in which the output member rotatably installed in the casing is rotated by the drive motor,
Since the fluid port and the communication passage are formed so as to form a pressure oil rotary joint between the casing and the output member, the structure of the entire device is simpler and more compact than the conventional one, and it is suitable for installation. In addition to not requiring space, it is inexpensive, and the contact parts of each member are greatly reduced, improving performance and generating less noise, improving durability and facilitating maintenance, etc. effective.

[Brief description of drawings]

FIG. 1 shows a first embodiment of the present invention, (A) is a vertical sectional front view thereof, (B) is a sectional view taken along line BB of (A), and FIG. 2 is a use state of the first embodiment. FIG. 3 shows a second embodiment of the present invention, (A) is a longitudinal front view thereof, (B) is a sectional view taken along line BB of (A), and FIG. 4 is conventional. It is a partial longitudinal front view of an example. DESCRIPTION OF SYMBOLS 1 ... Revolving body (or fixed part) 2 ... Fixed part (or revolving structure) 11 ... Drive device, 12,12 ', 12 "... Casing 13,13' ... Drive motor, 14 ... Output member 15,17 ... Fluid port , 16 ... Passage

Claims (1)

[Claims] 1. A drive motor installed in the casing, and installed in the casing on the same axis as the drive motor,
An output member rotated by a drive motor installed in the casing, the casing is provided with a fluid port connected to a hydraulic source, one end of the output member communicates with the fluid port, and the other end A revolving structure drive device characterized in that a communication passage having a fluid port opened to the outside of the output member is provided in the output member, and the torque of the output member is directly transmitted to the casing.