JPH06323234A - Hydromechanical type driving unit - Google Patents

Abstract

PURPOSE: To reduce an inconvenient action of inertia force so as to reduce a size of a device by supporting a planetary gear transmitting device by means of a pin and arranging a control face for a hydraulic motor in the end face of each pin. CONSTITUTION: A hydraulic motor is constructed as a swash plate structure type axial piston machine and supported rotationally by means of a boss holding body 1. In the holding body 1, a plurality of pressure medium passages 5 are arranged and opened to a control face 6 in the hydraulic motor. On the other hand, within the range of the control face 6, a cylinder drum 7 is connected to a double eccentric body by means of a pin without any lateral force so as not to rotate, while the double eccentric body, that is, a web combination 15/17 forms an input element for a planetary gear transmission device. Residual inertial force which is not compensated by the mutually shifted planetary gears is supported by the pin so as to be introduced to the boss holding body 1. Therefore, influence on the cylinder drum 7 due to inertia force can be eliminated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydromechanical drive unit, which is a hydromotor and a planetary gear which is arranged in the hydromotor casing after the hydromotor in a force transmission path. A planetary gear transmission is provided with an eccentric drive, in which case the hydromotor is configured as an axial piston machine of swash plate construction type.

[0002]

Hydromechanical drive units of this type, which have a very high transmission ratio, are used, for example, as wheel drives.

A hydromechanical drive unit consisting of a drive motor and a rear planetary gearbox with an eccentric drive is disclosed in DE-A-3149108. ing. In this case, the drive motor is connected to a planetary gear transmission, which consists of a number of individual parts, which is arranged in a separate transmission casing.

Published German Patent Application No. 2311
In a drive unit of the type known from U.S. Pat. No. 118, the planetary gear transmission is arranged in the housing of the hydromotor, so that in this case a very compact and very low number of individual parts There is provided a drive unit having only that. In this known arrangement, one gear is eccentrically supported on the outer circumference of the cylinder drum, and this gear is arranged parallel to the inner tooth row of the machine casing, which is fixed in position. Is also engaged with the inner toothing of the web, which is configured as a driven shaft. However, this known design has the following disadvantages: a significantly large lateral force acting on the cylinder drum due to inertial forces due to the eccentric bearing of the gear. Indeed, it is proposed in the above-mentioned specification to suppress the action of such lateral forces by arranging one or, preferably, a plurality of mass balance weights, however, such a procedure is Not only does this increase the number of components that must be manufactured and installed, but it also increases the weight of the drive unit.

[0005]

SUMMARY OF THE INVENTION The object of the present invention is therefore to improve a hydromechanical drive unit of the type mentioned at the outset to reduce the disadvantageous effect of inertial forces at a low cost. It is to provide a hydromechanical drive unit having a compact structure.

[0006]

In order to solve this problem, in the structure of the present invention, the planetary gear transmission is supported by the pin, and the control surface of the hydromotor is provided at the end face of the pin. I did it.

[0007]

The main idea of the present invention is to introduce the inertial force due to the eccentricity of the drive unit of the planetary gear transmission into the casing-fixed constituent member arranged inside the hydromotor. Yes, this component already has the function assigned to the hydromotor, in this case the function of the control bottom. The control surface can in this case be formed directly on the end face of the pin, which acts as a bearing for the planetary gear transmission, or can be formed integrally on a component which is connected to the end face of the pin. As a result of this configuration, the cylinder drum can avoid the influence of lateral forces on the control surface. In addition to this, the drive unit according to the invention has a very compact size.

In an advantageous configuration of the invention, the planetary gear transmission is embodied as an eccentric body / transmission.

In a further advantageous development of the invention, the planetary gear transmission is embodied as a cyclo-transmission.

In both of the configurations mentioned above, a very small number of components is required for the transmission, despite the fact that a very large transmission ratio is obtained.

In a particularly advantageous further development of the hydromechanical drive unit according to the invention, the hydromechanical drive unit is embodied as a boss drive, which is rotatably mounted on a fixed boss holder. A boss, and the boss holder and the boss together form a casing, and the hydromotor and the planetary gear transmission are arranged in the casing, and in this case, the boss holder, The pin holding the planetary gear transmission is fixed or integrally molded, and in this case the driven element of the planetary gear transmission is connected to the boss or is formed integrally with the boss.

In order to obtain a very large transmission ratio when the eccentric body / planetary gear / transmission is installed in the boss drive, in another advantageous configuration of the present invention, the eccentric body / planetary gear transmission gearbox is mounted. As a drive element, there is provided a hollow gear coupled to the boss or integrally formed with the boss, the hollow gear engaging with a planetary gear, and the planetary gear of a hydromechanical drive unit. Is supported on a web which is eccentric with respect to the drive axis, which web is joined to or formed integrally with a second eccentric web, both webs being respectively two of the double eccentric bodies. Configured as one of the eccentric discs,
In this case, a second parallel planetary gear is supported on the second web, and the planetary gear is connected to a position-fixed boss holder or is formed as a hollow gear on the boss holder. The webs which are engaged and in this case are connected to one another form the input elements of the eccentric / planetary gear drive, which input elements are drivingly connected to the hydromotor. With this construction, only four teeth, that is, the inner teeth of both hollow gears and the outer teeth of both planetary gears, need to be manufactured. If the inner toothing sequence is molded directly on the provided boss and boss carrier in any case, only three components are required to form the planetary gear transmission. That is, it refers to two planetary gears and a double eccentric, in which case the double eccentric is formed integrally with each other and consists of two webs.

In order to obtain a very large transmission ratio when a cyclo-transmission is used in a boss drive, in another advantageous embodiment of the invention, a drive cylinder is used as the driven element of the cyclo-transmission. There is provided a hollow gear having a tooth row, the hollow gear engaging a planetary gear having a cycloid tooth row, the planet gear being relative to a drive axis of a hydromechanical drive unit. Supported on an eccentric sun gear, which is arranged parallel to the sun gear and is connected to or integrally formed with a second sun gear eccentric to the drive axis. And both sun gears are each configured as one of the two eccentric discs of the double eccentric body, in which case the second sun gear is provided with a second eccentric toothed row. A star gear is mounted, which planet gear is engaged with a hollow gear which is connected to a fixed boss carrier and which has a drive cylindrical toothing, in which case the web is further provided with a boss carrier. Is formed by a plurality of eccentric pins that are fixed to the
The sun gears, which are equipped with coaxial rollers and which are engaged in the bores of the planetary gears and are connected to each other, form the input elements of the cyclo-gear device, which input elements are It is drivingly connected to a hydromotor.

When the eccentric body / transmission device described above is used, and also when the cyclo / transmission device is used, they have eccentricities shifted by 180 ° from each other in the circumferential direction and are arranged side by side. The unbalance compensation and the output branching are performed by the two planetary gears respectively.
The remaining tilting moment can easily be introduced into the axle of the vehicle, for example, through a correspondingly dimensioned boss holder suspension.

In order to dimension the hydromechanical drive unit as compactly as possible and to reduce the number of components, in another advantageous embodiment of the invention, the cylinder drum of the hydromotor has a force transmission path. Is connected to the input element of the planetary gear transmission non-rotatably and without lateral force without interposing a driven shaft on the motor side arranged in the Fixed to or integrally formed with a tensile member that is non-rotatably coupled to the boss holder, in which case the bearing has a swash plate between the tensile member and the boss. It is provided in the range of. Unlike the driven shaft on the motor side, which is used in the drive unit of the prior art hydromechanically and has a spline for force connection with the cylinder drum, the tensile member is easy to manufacture. It can be installed and installed. Further, the bearing device which is necessary when using the driven shaft can be omitted. The bearing required for compensation between the rotating boss and the position-fixed tensile member supported at one end by the boss holder and at the other end by the boss is structurally
It's extremely simple. This is because the boss has a low rotational speed with respect to the tensile member.
For example, the boss has a maximum cylinder drum speed of 30 rpm.
00 rotation and the reduction ratio of the planetary gear transmission is 1
In the case of 5: 1, it only rotates at a speed of 200 rpm, so it is sufficient to provide a simple plain bearing at this point.

An Oldham coupling, for example, is suitable as a non-rotatable and laterally free connection between the cylinder drum and the input element of the planetary gearbox.
Such a connection allows the cylinder to be freely adjusted along the control surface.

In order to absorb the drive force generated by the working piston being supported on the swash plate and the control surface being hydraulically unloaded, in a further advantageous embodiment of the invention. A cylinder drum is supported on the tensile member at its end remote from the control surface. In this case, it is advantageous if a rolling bearing, for example a needle bearing, is arranged in the area of the tensile member near the swash plate between the rotating cylinder drum and the fixed tensile member. Since the tensile member itself is supported on the rotating boss, forces are introduced at the bearing points (wheel bearings) arranged between the boss and the boss holder.

In a further advantageous embodiment of the invention, a brake is arranged between the cylinder drum and the boss, which arrangement thus stops the hydromechanical drive unit. be able to.

[0019]

Embodiments of the present invention will now be described with reference to the drawings.

The hydromechanical drive unit shown in FIG. 1 is configured as a boss drive device and has a boss holder 1, which is a boss holder.
For example, it is fixed to the vehicle shaft of a movable power shovel.
In this embodiment, the boss 2 is rotatably supported by the boss holder 1 via a bearing device 3 which is configured as a two-row angular contact ball bearing and is arranged in an O-shape. The inner race of the bearing device 3 is directly formed integrally with the boss 1 in this embodiment. The boss 2 may be provided with a fixing bolt 4 shown in phantom for the disc wheel rim. A plurality of pressure medium passages 5 are arranged in the boss holder 1, and these pressure medium passages 5 open into a control surface 6 of a hydromotor arranged inside the wheel drive device. This hydromotor is constructed as an axial piston machine of the swash plate structure type. Control surface 6
Comprises, in a known manner, a plurality of kidney-shaped control slots which periodically connect a drive cylinder 8 arranged on a cylinder drum 7 of the hydromotor with a pressure medium passage 5. Work for. Control surface 6
Is formed on the component member (that is, integrally molded) that is joined to the boss holder 1, that is, the pin 1a.

Work pistons 9 are arranged in the work cylinder 8, and these work pistons 9 are supported by a swash plate 10. The swash plate 10 is non-rotatably connected to the tensile member 11, and the tensile member 11 is non-rotatably fixed to the boss holder 1 via a spline. Instead of splines, it is also possible to use groove-key connections, such groove-key connections already being provided in the illustrated embodiment between the swash plate 10 and the tension member 11 in a non-rotatable manner. Is used for. The swash plate 10 and the tensile member 11 may be configured integrally with each other. Since the cylinder drum 7 rotates in the opposite direction to the tensile member 11, the rolling bearing 12 is arranged near the swash plate between the cylinder drum 7 and the tensile member 11.

The cylinder drum 7 is connected non-rotatably and without lateral force with a double eccentric in the region of the control surface 6 by means of a coupling suitable for this purpose, in which case the double eccentric is a pin. It is supported by 1a. The control surface 6 is controlled by the coupling type of the cylinder drum 7 without lateral force
A "free" adjustment of the cylinder drum 7 along is possible. Double eccentrics are integrally connected to each other 2
It consists of two eccentric discs. The eccentricity is offset from each other by 180 ° in the circumferential direction. Planet gears 13 and 14 are respectively supported on the eccentric discs. One of the eccentric discs, on which the planetary gear 13 is supported, forms a first web 15 of the eccentric / planetary gear transmission. The planetary gear 13 is engaged with a hollow gear 16 integrally formed with the rotatable boss 2. The second eccentric disc, which is supported on the planetary gear 14, forms the second web 17 of the eccentric / planetary gear transmission. And the planetary gear 14
Engages with a hollow gear 18 integrally formed with the position-fixed boss holder 1.

The double eccentric or web combination 15/17 thus forms the input element of the planetary gear transmission and the hollow gear 18 forms the output element. Depending on the eccentricity, the residual inertia forces that are still present, that is, the residual inertia forces that are not compensated by the planet gears that are offset from each other, and the tilting moment, are due to the planetary gear transmission being supported on the pin 1a. As a result, the boss holder 1 is introduced.
Therefore, the influence of the inertial force on the cylinder drum 7 does not exist.

Due to the arrangement of the components described above according to the invention, a hydromechanical drive unit with a large reduction ratio between the cylinder drum 7 and the boss 2 in a minimum structural space. Is generated. The non-rotatable tensile member 11 must also be supported in the area of the swash plate 10, so that a plain bearing 19 is centered with at least one fitting pin 20 and screwed to the boss 2. The boss cover 21 is arranged inside the boss cover 21.
Is removed for maintenance and inspection of the hydromechanical drive unit.

A tooth row is provided on the outer peripheral portion of the cylinder drum 7, and a plurality of brake plates 22 of the multi-disc brake are arranged in this tooth row. Can be fixed to the cylinder drum 7. A brake plate 23, which is arranged in a tooth row provided on the outer peripheral portion of the boss 2, is located between the brake plates 22. In this case, it is advantageous if the teeth formed integrally with the hollow gear 16 are held in a somewhat wider width. The multi-disc brake is configured as a spring energy store brake that can be released by a hydraulically loadable brake piston 24.

The embodiment shown in FIG. 2 differs from the embodiment shown in FIG. 1 in that, in addition to small structural differences,
The point is that a cyclonic transmission is provided instead of the eccentric body / planetary gear transmission.

Also in the embodiment shown in FIG. 2, as in FIG. 1, the cylinder drum 7 is mounted on the pin 1a non-rotatably and without lateral force in the area of the control surface 6. Is combined with. The double eccentric body likewise consists of two eccentric discs which are integrally connected to each other. The eccentricities are offset by 180 ° with respect to each other in the circumferential direction. Planetary gears 25 and 26 are respectively supported on the eccentric discs. Planetary gear 25
One of the eccentric discs, on which the bearing is mounted, forms the first sun gear 27 of the cyclone transmission. The planetary gear 25 then engages via a cycloidal toothing arranged on the outer periphery with a hollow gear 28 formed on the boss 2, in which case the hollow gear 28 is therefore rotatable. A drive cylinder tooth row 28 a fixed to the boss 2 is provided. The second eccentric disc, on which the planetary gear 26 is supported, forms the second sun gear 29 of the cyclonic transmission. Similarly, the planetary gear 26 is also engaged with the hollow gear 28 or the drive cylindrical tooth row 28a. The web for fixing the position of the cycloid / transmission device is formed by a plurality of concentric pins 30 fixed to the boss holder 1.
Each of these pins 30 comprises a coaxial roller 31 which engages a hole 32 in the planet gears 25, 26. In another known cyclo-transmission device, a common hollow gear is fixed so that the web acts as a driven element.

The double eccentric or sun gear combination 27/29 forms the input element of the planetary gear transmission and the hollow gear 28 forms the output element. Also in this embodiment, there is no influence on the cylinder drum 7 due to the inertial force.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a hydromechanical drive unit according to the present invention including an eccentric body / planetary gear transmission.

FIG. 2 is a cross-sectional view showing a hydromechanical drive unit according to the present invention, which is provided with a cycloidal transmission.

[Explanation of symbols]

1 boss holder, 1a pin, 2 boss, 3 bearing device, 4 fixing bolt, 5 pressure medium passage, 6
Control surface, 7 cylinder drum, 8 drive cylinder,
9 work pin, 10 swash plate, 11 tensile member,
12 rolling bearings, 13 and 14 planetary gears, 1
5,17 Web, 16,18 Hollow gear, 19
Plain bearing, 20 mating pins, 21 boss cover,
22 and 23 brake plates, 25 and 26 planetary gears, 2
7 sun gears, 28 hollow gears, 28a drive cylindrical tooth row, 29 sun gears, 30 pins, 31 rollers, 32 holes

Claims (9)

[Claims] 1. A hydromechanical drive unit, comprising: a hydromotor; and a planetary gear transmission that is disposed in the casing of the hydromotor, which is located after the hydromotor in a force transmission path. The planetary gear transmission is provided with an eccentric drive device, and in this case, the hydromotor is configured as an axial piston machine of a swash plate structure type, and the planetary gear transmission is a pin (1a). A hydromechanical drive unit, characterized in that the control surface (6) of the hydromotor is provided on the end face of the pin (1a). 2. The hydromechanical drive unit according to claim 1, wherein the planetary gear transmission is configured as an eccentric body / transmission. 3. The hydromechanical drive unit according to claim 1, wherein the planetary gear transmission is configured as a cyclone transmission. 4. A hydromechanical drive unit is configured as a boss drive, and has a position-fixed boss holder (1) and a rotatably supported boss (2). The boss holder (1) and the boss (2) together form a casing, and the hydromotor and the planetary gear transmission are arranged in the casing. In this case, the boss holder (1) has a planetary gear. The pin (1a) holding the gear transmission is fixed or integrally molded,
Moreover, in this case, the driven element of the planetary gear transmission is connected to the boss (2) or is formed integrally with the boss (2). Drive unit. 5. The driven element of an eccentric / planetary gear transmission, which is connected to the boss (2) or is a boss (2).
Is provided with a hollow gear (16) integrally molded with
The hollow gear (16) is engaged with a planetary gear (13), the planetary gear (13) being eccentric to the drive axis of the hydromechanical drive unit (15).
Is supported on the second eccentric web (17) or is integrally formed with the second eccentric web (17), the two webs (15, 17) each being a double eccentric body. It is designed as one of two eccentric discs, in which case a second parallel planet gear (14) is mounted on the second web (17) and the planet gear (1
4) is engaged with a hollow gear (18) which is connected to the fixed boss holder (1) or is integrally formed with the boss holder (1), and in this case is connected to each other. 5. A hydromechanical hydromechanical according to claim 2, wherein the webs (15, 17) forming the eccentric body and the planetary gear transmission form an input element which is drivingly connected to a hydromotor. Drive unit. 6. A hollow gear (28) having a driving cylindrical tooth row is provided as a driven element of a cycloidal transmission, and the hollow gear (28) has a planetary gear (having a cycloid tooth row). 25) and the planetary gear (25) is mounted on a sun gear (27) which is eccentric to the drive axis of the hydromechanical drive unit, the sun gear (27) A second sun gear (29) which is arranged parallel to the sun gear (27) and is eccentric to the drive axis and which is connected to or integrally formed with the second sun gear (27). , 29) each being configured as one of two eccentric discs of a double eccentric, in which case the second sun gear (29) is
A second planetary gear (26) with a cycloidal toothing is supported, which planetary gear (26) is connected to a fixed boss carrier (1) and is hollow with a driving cylindrical toothing. In engagement with the gear wheel (28), the web is further formed by eccentric pins (30) fixed to the boss holder (1), said pins (3)
0) each of which has a coaxial roller (31) which engages in a hole (32) of the planetary gear (25, 26) and in this case is connected to one another
5. A hydromechanical drive unit according to claim 3 or 4, characterized in that (27, 29) form an input element of a cyclonic transmission, said input element being drivingly connected to a hydromotor. 7. A cylinder drum (7) of a hydromotor
Is non-rotatably and laterally coupled to an input element of a planetary gear transmission without interposing a motor-side driven shaft arranged in a force transmission path, and a swash plate (10) is provided. Of the tensile member (1) that penetrates the cylinder drum (7) and is non-rotatably connected to the boss holder (1).
1) fixed or formed integrally with the tensile member (11), in which case a bearing (19) is provided between the tensile member (11) and the boss (2). ) Is provided in the range of any one of claims 4 to 6
The hydromechanical drive unit described in the item. 8. The hydromechanical drive unit according to claim 7, wherein the cylinder drum (7) is supported on the tensile member (11) at its end remote from the control surface. 9. The hydromechanical drive unit according to claim 4, wherein a brake is arranged between the cylinder drum (7) and the boss (2).