A spline connecting device suitable for electric motor and hydraulic pump
Patent Information
- Application Number
- CN202522371499.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-07
- Publication Date
- 2026-09-29
- Estimated Expiration
- 2035-11-07
AI Technical Summary
采用联轴器存在的不足之处：1、联轴器两端与对应端的轴一般是单键相连，单键的承载力及传递扭矩有限，不能满足强夯机、旋挖钻机、履带吊等使用电机驱动液压泵的工程机械车辆对于承载力及传递扭矩的需求；2、联轴器体积大，一方面所需安装空间较大，对空间布局的要求也比较高，另一方面一般只能外露安装，外界尘土、雨水及杂质的进入容易进入，影响系统的运行可靠性及使用寿命；3、联轴器结构复杂，加工难度高，安装时操作麻烦；4、联轴器的加工制作成本和使用成本都比较高；5、联轴器内部含有橡胶、尼龙等材料，容易受到外界环境（温度、湿度等）的影响而老化，需定期进行检修及保养更换，使用寿命不长
利用本实用新型连接在电机和液压泵之间，能传递更大的扭矩，承载能力显著增强，传动平稳，噪音小；同时退刀槽的轴向限位能有效防止轴向窜动，提高系统运动传递的平稳性及可靠性；本实用新型还能避免内部花键运动副外露安装，能有效避免外界尘土、雨水及杂质的进入，提高系统的运行可靠性，延长使用寿命；本实用新型还具有结构紧凑、节约空间、成本低，便于操作的优点。
Smart Images
Figure CN224814194U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of connecting a motor and a hydraulic pump in motor-driven hydraulic pump equipment, and more specifically to a spline connection device suitable for connecting a motor and a hydraulic pump, especially suitable for installation on engineering machinery vehicles that use motor-driven hydraulic pumps, such as dynamic compaction machines, rotary drilling rigs, and crawler cranes. Background Technology
[0002] The construction machinery industry is rapidly developing towards new energy sources, with electric motors being used more and more extensively. The trend of hydraulic pumps being driven by electric motors is becoming increasingly prevalent. Currently, in the construction machinery industry, couplings are commonly used to connect electric motors and hydraulic pumps for power transmission. The disadvantages of using couplings are as follows: 1. The shafts at both ends of the coupling are generally connected by a single key. The load-bearing capacity and torque transmission of a single key are limited, which cannot meet the load-bearing capacity and torque transmission requirements of engineering machinery vehicles such as dynamic compaction machines, rotary drilling rigs, and crawler cranes that use motor-driven hydraulic pumps; 2. Couplings are large in size, requiring a large installation space and strict spatial layout requirements. They are also generally installed externally, making them susceptible to entry of external dust, rainwater, and impurities, affecting the reliability and service life of the system; 3. Couplings have a complex structure, are difficult to process, and are troublesome to install; 4. The processing and manufacturing costs and operating costs of couplings are relatively high; 5. Couplings contain materials such as rubber and nylon, which are easily affected by the external environment (temperature, humidity, etc.) and age, requiring regular inspection, maintenance, and replacement, resulting in a short service life. Summary of the Invention
[0003] The purpose of this invention is to address the shortcomings of the existing technology by providing a spline connection device suitable for motors and hydraulic pumps. Using this invention to connect the motor and hydraulic pump allows for the transmission of greater torque, significantly enhanced load-bearing capacity, smoother transmission, and lower noise. Simultaneously, the axial limiting of the relief groove effectively prevents axial movement, improving the smoothness and reliability of the system's motion transmission. This invention also avoids the exposed installation of the internal spline moving parts, effectively preventing the ingress of external dust, rainwater, and impurities, improving the system's operational reliability and extending its service life. Furthermore, this invention has the advantages of compact structure, space saving, low cost, and ease of operation.
[0004] The objective of this utility model can be achieved through the following technical measures: This utility model discloses a splined connection device for a motor and a hydraulic pump, comprising an I-beam bracket formed by bolts between the motor and the hydraulic pump to create a relatively sealed cavity (the relatively sealed cavity prevents the internal splined moving parts from being exposed, effectively preventing the entry of external dust, rainwater, and impurities, improving the system's operational reliability, and extending its service life); and splined sleeves embedded in the inner cavity of the I-beam bracket, with both ends respectively cooperating with the splined shafts of the hydraulic pump and the motor to form splined moving parts (these two sets of splined moving parts uniformly transmit torque and load between the motor and the hydraulic pump; compared with traditional couplings, under the same shaft diameter, the splined moving parts can transmit greater torque and significantly enhance the load-bearing capacity than a single flat key, exhibiting advantages such as strong load-bearing capacity, large torque transmission, smooth transmission, and low noise; simultaneously, compared with traditional couplings, the splined moving parts of this utility model have a compact structure, save space, facilitate layout, reduce costs, and are easy to operate). The spline sleeve is a cylindrical body with a three-tiered inner cavity. The left end of the three-tiered inner cavity is the connecting spline groove cavity for mates with the hydraulic pump spline shaft (the hydraulic pump spline shaft and the connecting spline groove cavity form a spline kinematic pair used to evenly transmit torque and load between the spline sleeve and the hydraulic pump). The right end of the three-tiered inner cavity is the connecting spline groove cavity for mates with the motor spline shaft (the motor spline shaft and the connecting spline groove cavity form a spline kinematic pair used to evenly transmit torque and load between the motor and the spline sleeve). The inner cavity between the splined cavity of the pump and the splined cavity of the machine is a transition cavity (used to connect the splined cavity and the splined cavity of the machine, while reducing the overall weight of the splined sleeve). The connection between the transition cavity and the splined cavity of the pump, and between the transition cavity and the splined cavity of the machine, is machined with a tool retraction limiting groove (because the tool retraction limiting groove has an axial limiting function, this utility model can effectively prevent axial movement and improve the stability and reliability of the system motion transmission).
[0005] In this invention, both the outer surfaces of the hydraulic pump spline shaft and the motor spline shaft are machined with spline teeth; the inner surface of the connecting pump spline cavity is machined with a spline groove that matches the spline teeth on the outer surface of the hydraulic pump spline shaft (ensuring that the hydraulic pump spline shaft and the connecting pump spline cavity can be smoothly matched to form a spline kinematic pair to uniformly transmit torque and load); the inner surface of the connecting machine spline cavity is machined with a spline groove that matches the spline teeth on the outer surface of the motor spline shaft (ensuring that the motor spline shaft and the connecting machine spline cavity can be smoothly matched to form a spline kinematic pair to uniformly transmit torque and load).
[0006] In this invention, the inner diameter of the transition cavity is smaller than the inner diameter of the connecting pump spline groove cavity; the inner diameter of the transition cavity is smaller than the connecting machine spline groove cavity (the transition cavity located in the middle is smaller and easier to process).
[0007] The I-shaped bracket described in this utility model consists of a cylindrical sleeve and a pump connecting flange and a machine connecting flange welded to both ends of the cylindrical sleeve. The cylindrical sleeve, pump connecting flange, and machine connecting flange are all assembled from two symmetrical split parts that are interlocked (for easy installation). The pump connecting flange and the hydraulic pump flange are connected by bolts (the flange and bolt combination facilitates quick connection and quick disassembly). The machine connecting flange and the motor flange are connected by bolts (the flange and bolt combination facilitates quick connection and quick disassembly).
[0008] The design principle of this utility model is as follows: This invention replaces the traditional coupling with an I-beam bracket and two sets of splined kinematic pairs to connect the motor and hydraulic pump. Because the invention includes a splined sleeve with both ends engaging with the splined shafts of the hydraulic pump and motor respectively to form splined kinematic pairs, these two sets of splined kinematic pairs evenly transmit torque and load between the motor and hydraulic pump. Compared to traditional couplings, under the same shaft diameter, the splined kinematic pairs can transmit greater torque and significantly enhance load-bearing capacity than a single flat key, offering advantages such as high load-bearing capacity, large torque transmission, smooth transmission, and low noise. Furthermore, the axial limiting groove designed in the splined sleeve effectively prevents axial movement, improving the smoothness and reliability of the system's motion transmission. Simultaneously, the I-beam bracket, bolted between the motor and hydraulic pump to form a relatively sealed cavity, prevents the internal splined kinematic pairs from being exposed, effectively preventing the entry of external dust, rainwater, and impurities, improving system reliability and extending service life. In addition, compared with traditional couplings, the spline kinematic pair of this utility model has a compact structure, saves space, is easy to lay out, reduces costs, and is easy to operate.
[0009] The technical effects of this utility model are as follows: By connecting the motor and hydraulic pump using this invention, greater torque can be transmitted, load-bearing capacity is significantly enhanced, transmission is smooth, and noise is low. At the same time, the axial limiting of the relief groove can effectively prevent axial movement, improving the smoothness and reliability of the system's motion transmission. This invention also avoids the external installation of the internal spline moving parts, effectively preventing the ingress of external dust, rainwater, and impurities, improving the system's operational reliability and extending its service life. This invention also has the advantages of compact structure, space saving, low cost, and ease of operation. Attached Figure Description
[0010] Figure 1 This is a schematic diagram of the structure of this utility model.
[0011] The numbers in the diagram are explained as follows: 1. I-beam bracket, 1-1. Cylindrical sleeve, 1-2. Connecting pump flange, 1-3. Connecting machine flange; 2. Spline sleeve, 2-1. Connecting pump spline groove cavity, 2-2. Connecting machine spline groove cavity, 2-3. Transition cavity, 2-4. Retraction limit groove; 3. Motor, 3-1. Motor spline shaft, 3-2. Motor flange; 4. Hydraulic pump, 4-1. Hydraulic pump spline shaft, 4-2. Hydraulic pump flange; 5. Bolt. Detailed Implementation
[0012] This utility model will be further described in conjunction with the accompanying drawings: like Figure 1 As shown, this utility model provides a spline connection device for a motor and a hydraulic pump, comprising an I-beam bracket 1 connected by bolts 5 between a motor 3 and a hydraulic pump 4 to form a relatively sealed cavity (the relatively sealed cavity prevents the internal spline moving pairs from being exposed, effectively preventing the entry of external dust, rainwater, and impurities, improving the system's operational reliability, and extending its service life), and a spline sleeve 2 embedded in the inner cavity of the I-beam bracket, with both ends respectively cooperating with the spline shaft 4-1 of the hydraulic pump and the spline shaft 3-1 of the motor to form a spline moving pair (these two sets of spline moving pairs uniformly transmit torque and load between the motor and the hydraulic pump; compared with traditional couplings, under the same shaft diameter, the spline moving pair can transmit greater torque and significantly enhance the load-bearing capacity than a single flat key, and has the advantages of strong load-bearing capacity, large torque transmission, smooth transmission, and low noise; at the same time, compared with traditional couplings, the spline moving pair of this utility model has a compact structure, saves space, facilitates layout, reduces costs, and is easy to operate); the spline sleeve 2 is a cylindrical body with a three-step inner cavity. The left end of the inner cavity is the connecting spline groove cavity 2-1, which is used with the hydraulic pump spline shaft 4-1 (the hydraulic pump spline shaft 4-1 and the connecting spline groove cavity 2-1 form a spline kinematic pair, which is used to uniformly transmit torque and load between the spline sleeve 2 and the hydraulic pump 4). The right end of the inner cavity in the three-step inner cavity is the connecting spline groove cavity 2-2, which is used with the motor spline shaft 3-1 (the motor spline shaft 3-1 and the connecting spline groove cavity 2-2 form a spline kinematic pair, which is used to uniformly transmit torque and load between the motor 3 and the spline sleeve 2). The inner cavity section between the connecting pump spline groove cavity 2-1 and the connecting machine spline groove cavity 2-2 is a transition cavity 2-3 (used to connect the spline groove cavity 2-1 and the connecting machine spline groove cavity 2-2, while reducing the overall weight of the spline sleeve 2). The connection between the transition cavity 2-3 and the connecting pump spline groove cavity 2-1, and between the transition cavity 2-3 and the connecting machine spline groove cavity 2-2, is machined with a tool retraction limiting groove 2-4 (since the tool retraction limiting groove 2-4 has an axial limiting function, this utility model can effectively prevent axial movement and improve the stability and reliability of the system motion transmission).
[0013] In this invention, splined teeth are machined on the outer surfaces of both the hydraulic pump splined shaft 4-1 and the motor splined shaft 3-1; a spline groove matching the splined teeth on the outer surface of the hydraulic pump splined shaft 4-1 is machined on the inner surface of the connecting pump splined cavity 2-1 (ensuring that the hydraulic pump splined shaft 4-1 and the connecting pump splined cavity 2-1 can be smoothly matched to form a spline kinematic pair to uniformly transmit torque and load); a spline groove matching the splined teeth on the outer surface of the motor splined shaft 3-1 is machined on the inner surface of the connecting machine splined cavity 2-2 (ensuring that the motor splined shaft 3-1 and the connecting machine splined cavity 2-2 can be smoothly matched to form a spline kinematic pair to uniformly transmit torque and load).
[0014] In this invention, the inner diameter of the transition cavity 2-3 is smaller than the inner diameter of the connecting pump spline groove cavity 2-1; the inner diameter of the transition cavity 2-3 is smaller than the connecting machine spline groove cavity 2-2 (the transition cavity 2-3 located in the middle is smaller and easier to process).
[0015] The I-shaped bracket 1 described in this utility model is composed of a cylindrical sleeve 1-1 and a pump connecting flange 1-2 and a machine connecting flange 1-3 respectively welded to both ends of the cylindrical sleeve. The cylindrical sleeve 1-1, the pump connecting flange 1-2, and the machine connecting flange 1-3 are all assembled by splicing two symmetrical split parts together (for easy installation). The pump connecting flange 1-2 is connected to the hydraulic pump flange 4-2 by bolts 5 (the flange and bolt connection method facilitates quick connection and quick disassembly). The machine connecting flange 1-3 is connected to the motor flange 3-2 by bolts 5 (the flange and bolt connection method facilitates quick connection and quick disassembly).
[0016] The specific usage of this utility model is as follows: First, according to the above structural description and the positional relationship shown in the attached drawings, this utility model is connected between the hydraulic pump 4 and the motor 3. First, the two ends of the spline sleeve 2 are respectively fitted together with the hydraulic pump spline shaft 4-1 and the motor spline shaft 3-1, so that the hydraulic pump spline shaft 4-1 and the connecting pump spline groove cavity 2-1 are used to form a spline kinematic pair, and the motor spline shaft 3-1 and the connecting machine spline groove cavity 2-2 are used to form a spline kinematic pair. Then, the symmetrical split-structure I-shaped bracket 1 is fastened and installed between the connecting pump flange 1-2 and the connecting machine flange 1-3, and is connected and fixed by bolts 5. Subsequently, this invention can be used normally—starting the motor 3 causes the motor spline shaft 3-1 to rotate. A set of spline kinematic pairs, formed by the motor spline shaft 3-1 and the connecting spline groove cavity 2-2, evenly transmits torque and load from the motor 3 to the spline sleeve 2. Then, a set of spline kinematic pairs, formed by the connecting pump spline groove cavity 2-1 and the hydraulic pump spline shaft 4-1, evenly transmits torque and load from the spline sleeve 2 to the hydraulic pump 4. In this way, the torque and load of the motor 3 can be evenly transmitted to the hydraulic pump 4 using these two sets of spline kinematic pairs. Compared with traditional couplings, under the same shaft diameter, the spline kinematic pair can transmit greater torque and significantly enhance the load-bearing capacity than a single flat key. It has the advantages of strong load-bearing capacity, large torque transmission, smooth transmission, and low noise. Furthermore, because the tool retraction limiting groove 2-4 designed in the spline sleeve has an axial limiting function, this invention can effectively prevent axial movement and improve the smoothness and reliability of the system's motion transmission. Meanwhile, the I-beam bracket 1 is connected between the motor 3 and the hydraulic pump 4 by bolts 5 to form a relatively sealed cavity, which avoids the internal spline moving parts from being exposed and can effectively prevent the entry of external dust, rainwater and impurities, improve the operational reliability of the system and extend its service life.
Claims
1. A spline connection device suitable for motors and hydraulic pumps, characterized in that: The spline connection device includes an I-beam bracket (1) that is connected between the motor (3) and the hydraulic pump (4) by bolts (5) to form a relatively sealed cavity, and a spline sleeve (2) that is fitted into the inner cavity of the I-beam bracket and whose two ends are respectively engaged with the spline shaft of the hydraulic pump (4-1) and the spline shaft of the motor (3-1) to form a spline kinematic pair; the spline sleeve (2) is a cylindrical body with a three-step inner cavity, the left end of which is connected with the spline shaft of the hydraulic pump (4-1) and the spline shaft of the motor (3-1) to form a spline kinematic pair. 1) The connecting spline groove cavity (2-1) is used for connecting pumps. The right end of the three-step inner cavity is the connecting spline groove cavity (2-2) used with the motor spline shaft (3-1). The inner cavity section between the connecting spline groove cavity (2-1) and the connecting spline groove cavity (2-2) is the transition cavity (2-3). The connection between the transition cavity (2-3) and the connecting spline groove cavity (2-1), and between the transition cavity (2-3) and the connecting spline groove cavity (2-2) are all machined with a tool retraction limit groove (2-4).
2. The spline connection device for a motor and a hydraulic pump according to claim 1, characterized in that: Spline teeth are machined on the outer surfaces of both the hydraulic pump spline shaft (4-1) and the motor spline shaft (3-1); a spline groove matching the spline teeth on the outer surface of the hydraulic pump spline shaft (4-1) is machined on the inner surface of the connecting pump spline groove cavity (2-1); and a spline groove matching the spline teeth on the outer surface of the motor spline shaft (3-1) is machined on the inner surface of the connecting machine spline groove cavity (2-2).
3. A spline connection device for a motor and a hydraulic pump according to claim 1, characterized in that: The inner diameter of the transition cavity (2-3) is smaller than the inner diameter of the connecting pump spline groove cavity (2-1); the inner diameter of the transition cavity (2-3) is smaller than the connecting machine spline groove cavity (2-2).
4. A spline connection device for a motor and a hydraulic pump according to claim 1, characterized in that: The I-shaped bracket (1) is composed of a cylindrical sleeve (1-1) and a connecting pump flange (1-2) and a connecting machine flange (1-3) respectively welded to both ends of the cylindrical sleeve. The cylindrical sleeve (1-1), the connecting pump flange (1-2), and the connecting machine flange (1-3) are all spliced together by two symmetrical split parts. The connecting pump flange (1-2) is connected to the hydraulic pump flange (4-2) by bolts (5). The connecting machine flange (1-3) is connected to the motor flange (3-2) by bolts (5).