Hydraulic motor assembly and engineering machinery having the same

Abstract

The present invention provides a hydraulic motor assembly and an engineering machine having the same, wherein the hydraulic motor assembly comprises: a hydraulic motor body, the hydraulic motor body comprises a first housing and a first transmission shaft; a reducer, the reducer comprises a second housing and a second transmission shaft, the first housing and the second housing are connected, the first transmission shaft and the second transmission shaft are connected, wherein an oil gap is provided between the end of the first transmission shaft facing the second housing and the first housing, so that the space in the first housing and the space in the second housing are connected through the oil gap. The hydraulic motor assembly of the present invention has the characteristics of compact structure and small installation space occupation.

Description

Technical Field

[0001] The present invention relates to the technical field of engineering equipment, and in particular to a hydraulic motor assembly and an engineering machine having the same. Background Art

[0002] At present, in the domestic engineering machinery industry, the compactness of the structural design and layout of small-tonnage excavators is the future trend, which also limits the space for the installation of hydraulic motors and puts forward higher requirements for the structural design of motors. For small-tonnage excavators, the common hydraulic motors on the market have large axial dimensions and occupy a large installation space, which is contrary to the design concept of compact structure and saving installation space. Therefore, how to reduce the axial dimension of hydraulic motors is an urgent problem to be solved in the industry. Summary of the invention

[0003] Therefore, the present invention is intended to provide a hydraulic motor assembly with a smaller axial size and an engineering machine having the same.

[0004] In order to solve the above problems, the present invention provides a hydraulic motor assembly, including: a hydraulic motor body, the hydraulic motor body including a first housing and a first transmission shaft; a reducer, the reducer including a second housing and a second transmission shaft, the first housing and the second housing are connected, and the first transmission shaft and the second transmission shaft are connected, wherein an oil gap is provided between the end of the first transmission shaft facing the second housing and the first housing, so that the space in the first housing is connected with the space in the second housing through the oil gap.

[0005] Optionally, the hydraulic motor body further comprises an oil drain passage, which is arranged on the first housing, an oil inlet of the oil drain passage is communicated with the space in the second housing, and an oil drain port of the oil drain passage is communicated with the outside.

[0006] Optionally, the oil inlet is arranged on an end surface of the first housing facing the second housing, and the oil outlet is arranged on a side of the first housing.

[0007] Optionally, a bearing is arranged between the end of the first transmission shaft facing the second housing and the first housing, and a bearing mounting section is arranged on the first transmission shaft, and the width of the bearing mounting section is matched with the thickness of the bearing.

[0008] Optionally, the first shell and the second shell are connected together by fasteners.

[0009] Optionally, the fastener is a screw.

[0010] Optionally, the hydraulic motor assembly further comprises a connection structure disposed between the first transmission shaft and the second transmission shaft, wherein the connection structure is suitable for making the first transmission shaft and the second transmission shaft rotate synchronously.

[0011] Optionally, the hydraulic motor body also includes: a cylinder body, which is arranged in a first housing, a first transmission shaft is connected to the cylinder body and rotates synchronously, and a plurality of piston chambers are arranged on the cylinder body; a plurality of pistons, and the plurality of pistons are arranged in the piston chambers one by one; a return plate, and the end of the piston away from the cylinder body is connected to the return plate through a sliding shoe; and a swash plate, which is fixedly arranged in the first housing, and the return plate abuts against the swash plate.

[0012] The present invention also provides an engineering machine, comprising the above-mentioned hydraulic motor assembly.

[0013] Optionally, the construction machinery is an excavator.

[0014] The present invention has the following advantages:

[0015] By utilizing the technical solution of the present invention, an oil seal structure is no longer provided between the first transmission shaft and the first housing, and an oil gap is formed between the first transmission shaft and the first housing. On the one hand, the hydraulic oil in the hydraulic motor body can enter the second housing of the reducer from the oil gap, so that the hydraulic oil replaces the gear oil to lubricate the reducer. On the other hand, after the first transmission shaft is no longer provided with an oil seal structure, the axial length of the first transmission shaft can be shortened, and the axial dimension of the hydraulic motor body can be made smaller, thereby saving installation space. Therefore, the hydraulic motor assembly of the present invention has the characteristics of compact structure and small installation space. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 A cross-sectional schematic diagram of a hydraulic motor assembly of the present invention is shown;

[0018] Figure 2 Shows Figure 1 The enlarged schematic diagram at A in the middle;

[0019] Figure 3 Shows Figure 1 The enlarged schematic diagram of point B in the middle;

[0020] Figure 4 Shows Figure 1 A schematic structural diagram of an end portion of a first transmission shaft of a hydraulic motor assembly; and

[0021] Figure 5 Shows Figure 1Schematic diagram of the connection between the hydraulic motor body and the reducer of the hydraulic motor assembly.

[0022] Description of reference numerals:

[0023] 10. Hydraulic motor body; 11. First housing; 12. First transmission shaft; 121. Bearing mounting section; 13. Oil drain passage; 131. Oil inlet; 132. Oil drain; 14. Cylinder body; 141. Piston chamber; 15. Piston; 16. Return plate; 17. Slipper; 18. Swash plate; 20. Reducer; 21. Second housing; 22. Second transmission shaft; 30. Oil clearance; 40. Bearing; 50. Fastener; 60. Connection structure. DETAILED DESCRIPTION

[0024] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0026] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0028] like Figure 1 and Figure 2As shown, the hydraulic motor assembly of this embodiment includes: a hydraulic motor body 10 and a reducer 20. The hydraulic motor body 10 includes a first housing 11 and a first transmission shaft 12. The reducer 20 includes a second housing 21 and a second transmission shaft 22, the first housing 11 and the second housing 21 are connected, and the first transmission shaft 12 and the second transmission shaft 22 are connected. Further, an oil gap 30 is provided between the end of the first transmission shaft 12 facing the second housing 21 and the first housing 11, so that the space in the first housing 11 and the space in the second housing 21 are connected through the oil gap 30.

[0029] By utilizing the technical solution of this embodiment, an oil seal structure is no longer provided between the first transmission shaft 12 and the first housing 11, and an oil gap 30 is formed between the first transmission shaft 12 and the first housing 11. On the one hand, the hydraulic oil in the hydraulic motor body can enter the second housing 21 of the reducer 20 from the oil gap 30, so that the hydraulic oil replaces the gear oil to lubricate the reducer 20. On the other hand, after the first transmission shaft 12 is no longer provided with an oil seal structure, the axial length of the first transmission shaft 12 can be shortened, and the axial dimension of the hydraulic motor body can be smaller, thereby saving installation space. Therefore, the hydraulic motor assembly of this embodiment has the characteristics of compact structure and small installation space.

[0030] It should be noted that, since an oil seal structure (annular seal ring) is provided between the transmission shaft and the end cover in the hydraulic motor in the prior art, the axial dimension of the transmission shaft is relatively long, and the cavities between the hydraulic motor and the reducer are not interconnected. And the reducer in the prior art is lubricated solely with gear oil. In the present embodiment, the oil seal structure on the first transmission shaft 12 is eliminated, so the hydraulic oil in the first housing 11 can enter the second housing 21 along the oil gap 30, that is, the reducer 20 is lubricated by the hydraulic oil. On the one hand, it is not necessary to use gear oil for lubrication in the reducer, which reduces the cost. On the other hand, it is not necessary to provide a step surface for installing the oil seal structure on the first transmission shaft 12, thereby shortening the axial length of the first transmission shaft 12, thereby shortening the axial dimension of the hydraulic motor body 10.

[0031] Further, it should be noted that after the hydraulic oil passes through the oil gap 30 , it flows into the second housing 21 through the gap between the second housing 21 and the second transmission shaft 22 , thereby lubricating the reducer 20 .

[0032] like Figure 1As shown, in the technical solution of this embodiment, the hydraulic motor body 10 further includes an oil drain channel 13, which is provided on the first housing 11, and an oil inlet 131 of the oil drain channel 13 is communicated with the space in the second housing 21, and an oil drain port 132 of the oil drain channel 13 is communicated with the outside. Specifically, the lubricating oil in the reducer 20 can enter the oil drain channel 13 through the oil inlet 131, and then be discharged through the oil drain port of the oil drain channel 13. Furthermore, an oil port communicated with the above-mentioned oil inlet 131 is provided on the second housing 21.

[0033] like Figure 1 As shown, in the technical solution of this embodiment, the oil inlet 131 is arranged on the end face of the first housing 11 facing the second housing 21, and the oil outlet 132 is arranged on the side of the first housing 11. Specifically, the oil inlet 131 is located on the end face where the first housing 11 and the second housing 21 contact each other, so that the hydraulic oil in the second housing 21 can enter the oil outlet channel 13 through the oil inlet 131. The oil outlet 132 is arranged on the side of the first housing 11 along the circumferential direction.

[0034] like Figure 2 and Figure 4 As shown, in the technical solution of this embodiment, a bearing 40 is arranged between the end of the first transmission shaft 12 facing the second housing 21 and the first housing 11, and a bearing mounting section 121 is arranged on the first transmission shaft 12, and the width of the bearing mounting section 121 is adapted to the thickness of the bearing 40. Figure 4 It can be seen that since the hydraulic motor body 10 is no longer provided with an oil seal structure, the width of the bearing mounting section 121 only needs to be adapted to the thickness of the bearing 40, and there is no need to increase the thickness to assemble the oil seal. Therefore, the first transmission shaft 12 has the characteristic of a small axial dimension.

[0035] like Figure 5 As shown, in the technical solution of this embodiment, the first shell 11 and the second shell 21 are connected together by a fastener 50. Further, the connection between the first shell 11 and the second shell 21 is an embedded two-hole connection structure. And preferably, the fastener 50 is a screw.

[0036] like Figure 4As shown, in the technical solution of this embodiment, the hydraulic motor assembly also includes a connection structure 60 arranged between the first transmission shaft 12 and the second transmission shaft 22, and the connection structure 60 is suitable for making the first transmission shaft 12 and the second transmission shaft 22 rotate synchronously. Specifically, the connection structure 60 enables the second transmission shaft 22 to rotate synchronously with the first transmission shaft 12 when the first transmission shaft 12 rotates, thereby enabling the output power of the hydraulic motor body 10 to be reduced by the reducer 20. Further, the connection structure 60 includes a toothed structure arranged between the first transmission shaft 12 and the second transmission shaft 22, the outer surface of the end of the first transmission shaft 12 is provided with an external gear structure, and the end of the second transmission shaft 22 is concave and provided with an internal gear structure. The external gear structure and the internal gear structure mesh with each other, thereby enabling the first transmission shaft 12 and the second transmission shaft 22 to rotate synchronously.

[0037] like Figure 3 As shown, in the technical solution of this embodiment, the hydraulic motor body 10 also includes a cylinder body 14, a plurality of pistons 15, a return plate 16 and a swash plate 18. The cylinder body 14 is arranged in the first housing 11, the first transmission shaft 12 is connected to the cylinder body 14 and rotates synchronously, and a plurality of piston chambers 141 are arranged on the cylinder body 14. The plurality of pistons 15 are arranged in the piston chambers 141 in a one-to-one correspondence. The end of the piston 15 away from the cylinder body 14 is connected to the return plate 16 through a sliding shoe 17. The swash plate 18 is fixedly arranged in the first housing 11, and the return plate 16 abuts against the swash plate 18. Specifically, when the hydraulic motor body 10 is working, the piston 15 is driven by oil pressure to reciprocate and retract in the piston chamber 141. When the piston 15 is extended, it generates a lateral component force on the swash plate 18 to push the cylinder body 14 to rotate, thereby driving the first transmission shaft 12 to rotate.

[0038] This embodiment also provides an engineering machine, which includes the above-mentioned hydraulic motor assembly. Preferably, the engineering machine is an excavator. Of course, the engineering machine can also be other structures, such as a pump truck, a crane, etc.

[0039] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A hydraulic motor assembly, characterized in that: include: A hydraulic motor body (10), the hydraulic motor body (10) comprising a first housing (11) and a first transmission shaft (12); A reducer (20), the reducer (20) comprising a second housing (21) and a second transmission shaft (22), the first housing (11) and the second housing (21) being connected, the first transmission shaft (12) and the second transmission shaft (22) being connected, An oil gap (30) is provided between the end of the first transmission shaft (12) facing the second housing (21) and the first housing (11), so that the space in the first housing (11) and the space in the second housing (21) are connected through the oil gap (30); The hydraulic motor body (10) further comprises an oil drain passage (13), wherein the oil drain passage (13) is arranged on the first housing (11), an oil inlet (131) of the oil drain passage (13) is in communication with a space in the second housing (21), and an oil drain port (132) of the oil drain passage (13) is in communication with the outside; A bearing (40) is arranged between the end of the first transmission shaft (12) facing the second housing (21) and the first housing (11), and a bearing mounting section (121) is arranged on the first transmission shaft (12), wherein the width of the bearing mounting section (121) is adapted to the thickness of the bearing (40); The hydraulic motor body (10) further comprises: A cylinder body (14) is arranged in the first housing (11); the first transmission shaft (12) is connected to the cylinder body (14) and rotates synchronously with the cylinder body (14); and a plurality of piston chambers (141) are arranged on the cylinder body (14); A plurality of pistons (15), wherein the plurality of pistons (15) are arranged in the piston chamber (141) in a one-to-one correspondence; a return plate (16), the end of the piston (15) facing away from the cylinder body (14) being connected to the return plate (16) via a sliding shoe (17); The swash plate (18) is fixedly arranged in the first housing (11), and the return plate (16) abuts against the swash plate (18).

2. The hydraulic motor assembly according to claim 1, characterized in that: The oil inlet (131) is arranged on an end surface of the first housing (11) facing the second housing (21), and the oil outlet (132) is arranged on a side of the first housing (11).

3. The hydraulic motor assembly according to claim 1, characterized in that: The first shell (11) and the second shell (21) are connected together via a fastener (50).

4. The hydraulic motor assembly according to claim 3, characterized in that: The fastener is a screw.

5. The hydraulic motor assembly according to claim 3, characterized in that: The hydraulic motor assembly further comprises a connection structure (60) arranged between the first transmission shaft (12) and the second transmission shaft (22), wherein the connection structure (60) is suitable for causing the first transmission shaft (12) and the second transmission shaft (22) to rotate synchronously.

6. An engineering machine, characterized in that: Comprising the hydraulic motor assembly according to any one of claims 1 to 5.

7. The construction machine according to claim 6, characterized in that: The engineering machinery is an excavator.

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