A coaxiality adjustment device for motor pump set

Abstract

A coaxiality adjustment device for a motor-pump unit includes a motor bushing, a spindle, a transition flange, a reference flange, and a pump support. The motor bushing is cylindrical with a motor shaft cavity at its center. A rolling bearing is coaxially fitted within the cavity with an interference fit. The spindle is cylindrical and coaxially fitted within the inner hole of the rolling bearing with an interference fit. The pump support includes a bottom support plate and a vertical support plate. The bottom support plate is connected to a horizontal plane by several bolts, and the vertical support plate is vertically connected to the bottom support plate. A transition hole is provided on the vertical support plate, and its center is on the same horizontal line as the motor bushing. The transition flange is coaxially connected to the reference flange and is located within the transition hole. In application, coaxiality adjustment can be performed without rotating the motor shaft, eliminating the influence of motor shaft runout interference, reducing the difficulty of adjustment, and compensating for circular runout, resulting in more accurate test results. Therefore, this design not only has lower adjustment difficulty but also higher accuracy.

Description

Technical Field

[0001] This invention relates to a coaxiality adjustment device, belonging to the field of hydraulic system testing technology, and particularly to a coaxiality adjustment device for a motor pump set. Background Technology

[0002] Hydraulic pumps and motors are often connected by a bell housing or a pump support, which has high requirements for coaxiality. The former ensures coaxiality by machining a stop on a machine tool, while the latter requires repeated adjustments during assembly. A bell housing is usually preferred. However, in some working conditions, such as when it is necessary to test the mechanical efficiency of the hydraulic pump, according to relevant standards, a torque meter is required to be installed between the hydraulic pump and the motor shaft extension. In this case, the bell housing is no longer suitable due to its limited internal space, so a pump support is required.

[0003] When assembling and adjusting coaxiality, the pump support and the mounting flange of the hydraulic pump are usually aligned first, making them perpendicular to the motor shaft. Then, the coaxiality of the hydraulic pump shaft relative to the motor shaft is adjusted up, down, left, and right within the plane. However, due to the large clearance of some motor bearings, the axial movement of the motor shaft is large when it rotates (generally reaching 0.2~0.5mm), meaning the interference value far exceeds the detection value, making it impossible to align the plane. The coaxiality of the motor and hydraulic pump can only be adjusted directly within a limited space. This not only increases the difficulty of adjustment but also makes it difficult to achieve the required accuracy. In addition, if the runout of the hydraulic pump shaft relative to its stop circle is large or the shaft extension is splined, it will further increase the difficulty of coaxiality adjustment, resulting in low coaxiality accuracy.

[0004] The information disclosed in this background section is intended only to enhance understanding of the overall background of this application and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings and problems of existing technologies, such as high adjustment difficulty and low accuracy, and to provide a motor pump set coaxiality adjustment device that is not only easier to adjust but also more accurate.

[0006] To achieve the above objectives, the technical solution of the present invention is: a coaxiality adjustment device for a motor-pump unit, the adjustment device comprising a motor bushing, a spindle, a transition flange, a reference flange, and a pump support component; The motor bushing is cylindrical in shape, and a motor shaft cavity is formed at the center of the motor bushing. A rolling bearing is coaxially arranged inside the motor shaft cavity, and the rolling bearing is interference-fitted with the motor shaft cavity. The mandrel is cylindrical in shape and is coaxially disposed in the inner hole of the rolling bearing, with the mandrel and the inner hole having an interference fit. The pump support includes a bottom support plate and a vertical support plate. The bottom support plate is connected to the horizontal plane by several bolts. The vertical support plate is vertically connected to the bottom support plate. A transition hole is provided on the vertical support plate. The axis of the transition hole is located on the same horizontal line as the motor bushing. The transition flange is coaxially connected to the reference flange and is set in the transition hole.

[0007] The motor shaft cavity includes a large-diameter shaft cavity and a small-diameter shaft cavity connected in sequence. The large-diameter shaft cavity extends from one end of the motor shaft sleeve to the middle of the motor shaft sleeve, and the small-diameter shaft cavity extends from the other end of the motor shaft sleeve to the middle of the motor shaft sleeve. The rolling bearing is disposed in the small-diameter shaft cavity.

[0008] A left countersunk hole is provided at the center of the left end face of the mandrel, and a right countersunk hole is provided at the center of the right end face of the mandrel. A left bolt is installed in the left countersunk hole, and a right bolt is installed in the right countersunk hole.

[0009] The mandrel is provided with a left bearing locking baffle and a right bearing locking baffle at its two ends respectively. The left bearing locking baffle is disc-shaped and has a baffle shaft through hole at its axis. The left bearing locking baffle has several through holes along its axis circumferentially. The right bearing locking baffle has the same structure as the left bearing locking baffle.

[0010] The rolling bearing includes an outer ring, an inner ring, and a plurality of balls. The outer ring and the inner ring are concentrically arranged, and the plurality of balls are disposed between the outer ring and the inner ring.

[0011] The diameters of the left bearing locking baffle and the right bearing locking baffle are both larger than the inner hole of the rolling bearing and smaller than the outer diameter of the inner ring. The left bearing locking baffle is coaxially connected to the mandrel via a left bolt and fits against one side of the inner ring; the right bearing locking baffle is coaxially connected to the mandrel via a right bolt and fits against the other side of the inner ring.

[0012] The rolling bearings are arranged in a plurality of units, which are distributed in the motor shaft cavity at a certain distance from each other. A bearing positioning ring is provided between each pair of adjacent rolling bearings, and the bearing positioning ring is sleeved on the spindle.

[0013] The outer ring surface of the motor bushing has several bushing through holes, which extend from the outer ring surface of the motor bushing toward the axis of the motor bushing to the motor shaft cavity. Each bushing through hole is provided with a bushing bolt.

[0014] The transition flange is annular in shape, and a transition flange through hole is provided at the center of the transition flange. An annular protrusion is coaxially provided on one side of the transition flange. The outer diameter of the annular protrusion matches the transition through hole, and the annular protrusion is embedded in the transition through hole.

[0015] The reference flange is annular in shape, and a reference flange through hole is provided at the center of the reference flange. The reference flange is coaxially connected to the annular protrusion, and the diameter of the reference flange through hole is the same as that of the transition flange through hole.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. This invention discloses a coaxiality adjustment device for a motor-pump assembly, comprising a motor bushing, a spindle, a transition flange, a reference flange, and a pump support. The motor bushing is cylindrical with a motor shaft cavity at its center, and a rolling bearing is coaxially fitted within the cavity. The spindle is cylindrical and coaxially fitted within the inner hole of the rolling bearing. The pump support includes a bottom support plate and a vertical support plate. The bottom support plate is connected to a horizontal plane by several bolts, and the vertical support plate is vertically connected to the bottom support plate. A transition hole is provided on the vertical support plate, and its center is located on the same horizontal line as the motor bushing. The transition flange is coaxially connected to the reference flange and is disposed within the transition hole. In application, this design allows for coaxiality adjustment without rotating the motor shaft through the motor bushing, spindle, and rolling bearing, eliminating the influence of motor shaft runout interference and reducing the difficulty of adjustment. Furthermore, the transition flange and reference flange compensate for the circular runout of the hydraulic pump, resulting in more accurate test results. Therefore, this invention not only has lower adjustment difficulty but also higher accuracy.

[0017] 2. In the coaxiality adjustment device for a motor-pump unit of the present invention, the motor shaft cavity includes two shaft cavities with different diameters: a large diameter cavity and a small diameter cavity. The mandrel is disposed in the small diameter cavity via an interference fit with rolling bearings. Left and right bearing locking baffles are respectively provided on both sides of the mandrel, connected to the mandrel by bolts. Several bushing through holes are formed on the outer ring surface of the motor bushing, with bushing bolts installed inside. In application, the large diameter cavity is used to install the motor shaft, and it is connected to the mandrel via bushing bolts, facilitating disassembly and assembly. Furthermore, the rolling bearings are securely connected to the bearing positioning ring, the left and right bearing locking baffles, and the mandrel, which not only improves the rotational accuracy but also eliminates the influence of free clearance between components on the detection accuracy. Therefore, the present invention is not only easy to disassemble and assemble but also has high precision.

[0018] 3. In the coaxiality adjustment device for a motor-pump unit of the present invention, the transition flange is annular, with a through hole at its center. An annular protrusion is coaxially arranged on one side of the transition flange, its outer diameter matching the through hole. The annular protrusion is embedded within the through hole. The reference flange is annular, with a through hole at its center. The reference flange is coaxially connected to the annular protrusion, and the diameter of the through hole in the reference flange is the same as that in the transition flange. In application, this design allows for the adaptation of hydraulic pumps of different sizes via the transition flange, improving the applicability of the device. Furthermore, the reference flange can compensate for the runout of the hydraulic pump itself when facing large circular runout of the stop or spline shaft extension, reducing the difficulty of adjustment. Therefore, the present invention not only has good applicability but also low adjustment difficulty. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the present invention.

[0020] Figure 2 This is a schematic diagram showing the relative positions of the first rolling bearing and the second rolling bearing in this invention.

[0021] Figure 3 This is a schematic diagram of the pump support component in this invention.

[0022] Figure 4 yes Figure 3 Side view.

[0023] Figure 5 yes Figure 4 Top view.

[0024] Figure 6 This is a schematic diagram of the structure of the motor bushing in this invention.

[0025] Figure 7 yes Figure 6 Side view.

[0026] Figure 8 This is a schematic diagram of the mandrel in this invention.

[0027] Figure 9 yes Figure 8 Side view.

[0028] Figure 10 This is a schematic diagram of the structure of the left bearing locking baffle in this invention.

[0029] Figure 11 This is a cross-sectional view of the left bearing locking baffle in this invention.

[0030] Figure 12 This is a cross-sectional view of the rolling bearing in this invention.

[0031] Figure 13This is a schematic diagram of the rolling bearing in this invention.

[0032] Figure 14 This is a schematic diagram of the transition flange in this invention.

[0033] Figure 15 This is a cross-sectional view of the transition flange in this invention.

[0034] Figure 16 This is a schematic diagram of the reference flange in this invention.

[0035] Figure 17 This is a schematic diagram of the bearing positioning ring in this invention.

[0036] Figure 18 This is one of the schematic diagrams of the usage method steps in this invention.

[0037] Figure 19 This is the second schematic diagram of the usage method steps in this invention.

[0038] Figure 20 This is the third schematic diagram of the usage method steps in this invention.

[0039] Figure 21 This is the fourth schematic diagram of the usage method steps in this invention.

[0040] In the diagram: 1. Motor shaft sleeve; 11. Motor shaft cavity; 12. Shaft sleeve through hole; 13. Shaft sleeve bolt; 111. Large diameter shaft cavity; 112. Small diameter shaft cavity; 2. Mandrel; 21. Left end face; 211. Left countersunk hole; 212. Left bolt; 22. Right end face; 221. Right countersunk hole; 222. Right bolt; 3. Transition flange; 31. Transition flange through hole; 32. Annular protrusion; 4. Reference flange; 41. Reference flange through hole; 5. Pump support; 5. Bottom support plate; 51. Vertical support plate; 52. Transition through hole; 53. Bolt; 54. Rolling bearing; 6. Inner hole; 61. Outer ring bearing; 62. Inner ring; 63. Ball; 64. Left bearing locking baffle; 7. Baffle shaft through hole; 71. Through hole; 72. Right bearing locking baffle; 8. Bearing positioning ring; 9. Detailed Implementation

[0041] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0042] See Figure 1 — Figure 17 A coaxiality adjustment device for a motor pump set, the adjustment device comprising a motor bushing 1, a spindle 2, a transition flange 3, a reference flange 4, and a pump support 5; The motor bushing 1 is cylindrical in shape, and a motor shaft cavity 11 is provided at the center of the motor bushing 1. A rolling bearing 6 is coaxially arranged in the motor shaft cavity 11, and the rolling bearing 6 is interference-fitted with the motor shaft cavity 11. The mandrel 2 is cylindrical in shape and is coaxially disposed in the inner hole 61 of the rolling bearing 6. The mandrel 2 and the inner hole 61 are interference-fitted. The pump support 5 includes a bottom support plate 51 and a vertical support plate 52. The bottom support plate 51 is connected to the horizontal plane by several bolts 54. The vertical support plate 52 is vertically connected to the bottom support plate 51. A transition hole 53 is provided on the vertical support plate 52. The axis of the transition hole 53 is located on the same horizontal line as the motor bushing 1. The transition flange 3 is coaxially connected to the reference flange 4 and is disposed in the transition hole 53.

[0043] The motor shaft cavity 11 includes a large-diameter shaft cavity 111 and a small-diameter shaft cavity 112 connected in sequence. The large-diameter shaft cavity 111 extends from one end of the motor shaft sleeve 1 to the middle of the motor shaft sleeve 1, and the small-diameter shaft cavity 112 extends from the other end of the motor shaft sleeve 1 to the middle of the motor shaft sleeve 1. The rolling bearing 6 is disposed in the small-diameter shaft cavity 112.

[0044] A left countersunk hole 211 is provided at the center of the left end face 21 of the mandrel 2, and a right countersunk hole 221 is provided at the center of the right end face 22 of the mandrel 2. A left bolt 212 is provided in the left countersunk hole 221, and a right bolt 222 is provided in the right countersunk hole 221.

[0045] The mandrel 2 is provided with a left bearing locking baffle 7 and a right bearing locking baffle 8 at its two ends respectively. The left bearing locking baffle 7 is disc-shaped and has a baffle shaft through hole 71 at its axis. The left bearing locking baffle 7 has several through holes 72 arranged around its axis. The right bearing locking baffle 8 has the same structure as the left bearing locking baffle 7.

[0046] The rolling bearing 6 includes an outer ring 62, an inner ring 63, and a plurality of balls 64. The outer ring 62 and the inner ring 63 are concentrically arranged, and the plurality of balls 64 are disposed between the outer ring 62 and the inner ring 63.

[0047] The diameters of the left bearing locking baffle 7 and the right bearing locking baffle 8 are both larger than the inner hole 61 of the rolling bearing 6 and smaller than the outer diameter of the inner ring 63. The left bearing locking baffle 7 is coaxially connected to the spindle 2 via the left bolt 212 and fits against one side of the inner ring 63; the right bearing locking baffle 8 is coaxially connected to the spindle 2 via the right bolt 222 and fits against the other side of the inner ring 63.

[0048] Several rolling bearings 6 are provided, and the rolling bearings 6 are distributed in the motor shaft cavity 11 at a certain distance from each other. A bearing positioning ring 9 is provided between each pair of adjacent rolling bearings 6, and the bearing positioning ring 9 is sleeved on the spindle 2.

[0049] The outer ring surface of the motor bushing 1 is provided with a plurality of bushing through holes 12. The bushing through holes 12 extend from the outer ring surface of the motor bushing 1 toward the axis of the motor bushing 1 to the motor shaft cavity 11. Each bushing through hole 12 is provided with a bushing bolt 13.

[0050] The transition flange 3 is annular in shape. A transition flange through hole 31 is provided at the center of the transition flange 3. An annular protrusion 32 is coaxially provided on one side of the transition flange 3. The outer diameter of the annular protrusion 32 matches the transition through hole 53. The annular protrusion 32 is embedded in the transition through hole 53.

[0051] The reference flange 4 is annular in shape, and a reference flange through hole 41 is provided at the center of the reference flange 4. The reference flange 4 is coaxially connected to the annular protrusion 31, and the diameter of the reference flange through hole 41 is the same as that of the transition flange through hole 31.

[0052] The principle of this invention is explained as follows: When the runout of the hydraulic pump shaft relative to its stop is large, or when it is a splined shaft extension, the reference flange 4 can also compensate for it. The adjustment process is basically the same as in Example 1. First, the hydraulic pump 101, the transition flange 3, and the reference flange 4 are assembled, and the runout of the hydraulic pump 101 shaft extension relative to the inner ring wall of the reference flange 4 is detected and recorded, mainly including the values ​​of four points: up, down, left, and right. Then, the pump support 5 is adjusted in the horizontal and vertical directions, and the runout of the motor shaft 101 relative to the inner ring wall of the reference flange 4 is detected until the runout values ​​of the four points are basically the same as the previously recorded values. That is, the runout of the two shafts relative to the inner ring wall of the same reference flange 4 is basically the same. This can not only compensate for the influence of the runout of the hydraulic pump 102 itself, but also adjust the two shafts to a coaxial state.

[0053] Example 1: See Figure 1 — Figure 21 , 1. A coaxiality adjustment device for a motor-pump assembly, the device comprising a motor bushing 1, a spindle 2, a transition flange 3, a reference flange 4, and a pump support 5; the motor bushing 1 is cylindrical in shape, and a motor shaft cavity 11 is formed at the center of the motor bushing 1, wherein at least one rolling bearing 6 is coaxially arranged in the motor shaft cavity 11, and the rolling bearing 6 is interference-fitted with the motor shaft cavity 11; the spindle 2 is cylindrical in shape, and the spindle 2 is coaxially arranged in the inner hole 61 of the rolling bearing 6, and the spindle 2 is interference-fitted with the inner hole 61; the pump support 5 comprises a bottom support plate 51 and a vertical support plate 52, the bottom support plate 51 being connected to a horizontal plane by a plurality of bolts 54, the vertical support plate 52 being vertically connected to the bottom support plate 51, and a transition through hole 53 being formed on the vertical support plate 52, the axis of the transition through hole 53 being located on the same horizontal line as the motor bushing 1; the transition flange 3 is coaxially connected to the reference flange 4 and is disposed within the transition through hole 53.

[0054] In application, the steps for using this motor-pump coaxiality adjustment device include: Step 1, see Figure 18 Align the hydraulic pump shaft with the inner bore of the reference flange; First, assemble the transition flange 3, the reference flange 4, and the pump support 5, and install the hydraulic pump 102 on the pump support 5. Then, install the dial indicator 103 on the shaft extension end face of the hydraulic pump 102, and place the measuring part of the dial indicator 103 against the inner ring wall of the reference flange 4. Then, rotate the shaft extension of the hydraulic pump 102 to detect the circular runout of the shaft extension of the hydraulic pump 102 relative to the inner ring wall of the reference flange 4. The circular runout should be ≤0.05mm. If the requirement is not met, fine-tune the relative position of the reference flange 4 and the transition flange 3 until the circular runout meets the requirement. After the requirement is met, record the circular runout values ​​of the four points on the upper, lower, left, and right sides of the reference flange 4.

[0055] Step 2, see Figure 19 Align the spindle with the motor shaft; First, assemble the motor bushing 1, spindle 2, and rolling bearing 6, and install them on the motor shaft 101. Then, install the dial indicator 103 on the outer side of the spindle 2, and place the measuring part of the dial indicator 103 against the shaft extension surface of the motor shaft 101. Then, rotate the spindle 2 to detect the circular runout of the spindle 2 relative to the motor shaft 101. The circular runout should be ≤0.02mm. If the requirement is not met, fine-tune the motor bushing 1 until the circular runout meets the requirement.

[0056] Step 3, see Figure 20 Align the pump support mounting flange face with the mandrel; First, assemble the motor bushing 1, spindle 2, and rolling bearing 6, and install them on the motor shaft 101. Then, install the dial indicator 103 on the outer side of the spindle 2, and place the measuring part of the dial indicator 103 against the opposite outer surface of the vertical support plate 52. Then, rotate the spindle 2 to detect the runout of the contact surface between the pump support 5 and the transition flange 3 relative to the spindle 2. The planar runout should be ≤0.02mm. If the requirement is not met, adjust the installation angle of the pump support 5 by fine-tuning the bolts 54 until the planar runout meets the requirement.

[0057] Step 4, see Figure 21 Align the mandrel with the inner hole of the reference flange; First, install dial indicator 103 on the shaft extension of motor shaft 101, and place the measuring part of dial indicator 103 against the inner ring wall of reference flange 4. Then rotate motor shaft 101 to detect the circular runout of motor shaft 101 relative to the inner ring wall of reference flange 4. The circular runout should be ≤0.05mm, and the circular runout values ​​in the four directions (up, down, left, and right) should be consistent with the circular runout values ​​of hydraulic pump 102 shaft extension relative to the inner ring wall of reference flange 4 obtained in step one, so as to compensate for the influence of the circular runout of hydraulic pump 102 itself. If the requirements are not met, the center height of pump support 5 can be adjusted up and down using bolt 54, and the left and right adjustments can be made by fine-tuning the gap of bolt 54 to complete the coaxiality adjustment.

[0058] Example 2: The basic content is the same as in Example 1, except that: The motor shaft cavity 11 includes a large-diameter shaft cavity 111 and a small-diameter shaft cavity 112 connected in sequence. The large-diameter shaft cavity 111 extends from one end of the motor bushing 1 towards the middle of the motor bushing 1, and the small-diameter shaft cavity 112 extends from the other end of the motor bushing 1 towards the middle of the motor bushing 1. The rolling bearing 6 is disposed in the small-diameter shaft cavity 112. A left countersunk hole 211 is provided at the center of the left end face 21 of the spindle 2, and a right countersunk hole 221 is provided at the center of the right end face 22 of the spindle 2. The left countersunk hole 221 contains a... A left bolt 212 is provided, and a right bolt 222 is provided in the right countersunk hole 221; a left bearing locking baffle 7 and a right bearing locking baffle 8 are respectively provided at both ends of the mandrel 2. The left bearing locking baffle 7 is disc-shaped, and a baffle shaft through hole 71 is opened at the axis of the left bearing locking baffle 7. Several through holes 72 are provided on the left bearing locking baffle 7 along its circumferential axis; the right bearing locking baffle 8 has the same structure as the left bearing locking baffle 7; the rolling bearing 6 includes an outer ring 62, an inner ring 63, and... A plurality of ball bearings 64 are provided, with the outer ring 62 and inner ring 63 concentrically arranged, and the ball bearings 64 positioned between the outer ring 62 and the inner ring 63; the diameters of the left bearing locking baffle 7 and the right bearing locking baffle 8 are both larger than the inner hole 61 of the rolling bearing 6 and smaller than the outer diameter of the inner ring 63; the left bearing locking baffle 7 is coaxially connected to the spindle 2 via a left bolt 212 and fits against one side of the inner ring 63; the right bearing locking baffle 8 is coaxially connected to the spindle 2 via a right bolt 222 and fits against one side of the inner ring 63. The other side is fitted together; several rolling bearings 6 are provided (preferably two), and the several rolling bearings 6 are distributed in the motor shaft cavity 11 at a certain distance from each other. A bearing positioning ring 9 is provided between each pair of adjacent rolling bearings 6, and the bearing positioning ring 9 is sleeved on the spindle 2; several bushing through holes 12 are opened on the outer ring surface of the motor bushing 1. The bushing through holes 12 extend from the outer ring surface of the motor bushing 1 toward the axis of the motor bushing 1 to the motor shaft cavity 11. A bushing bolt 13 is provided in each bushing through hole 12.

[0059] In application, the spindle 2 is interference-fitted with two rolling bearings 6 to improve rotational accuracy. The two sides of the spindle 2 are connected to the left bearing locking baffle 7 and the right bearing locking baffle 8 respectively, and a bearing positioning ring 9 is set between the middle of the two rolling bearings 6. It is fastened by the left bolt 212 and the right bolt 222 to eliminate free clearance and avoid the influence of free clearance on the detection accuracy. At the same time, the diameter of the left bearing locking baffle 7 and the right bearing locking baffle 8 should be slightly larger than the inner hole 61, but smaller than the outer diameter of the inner ring 63, so that it can rotate synchronously with the rolling bearings 6. In addition, the left bearing locking baffle 7 and the right bearing locking baffle 8 are also used as the base for mounting the dial indicator 103.

[0060] The motor shaft 101 is installed in the large-diameter shaft cavity 111, and the two are fitted with a clearance fit to facilitate installation and removal. Preferably, there are four bushing holes 12, and the bushing bolts 13 are matched with the bushing holes 12. The concentricity of the motor bushing 1 and the motor shaft 101 can be adjusted by adjusting the screw depth of the bushing bolts 13.

[0061] Example 3: The basic content is the same as in Example 2, except that: The transition flange 3 is annular in shape. A transition flange through hole 31 is provided at the center of the transition flange 3. An annular protrusion 32 is coaxially provided on one side of the transition flange 3. The outer diameter of the annular protrusion 32 matches the transition through hole 53. The annular protrusion 32 is embedded in the transition through hole 53.

[0062] In application, the transition flange 3 is mounted on the pump support 5, and the hydraulic pump 102 is mounted on the transition flange 3. Different sizes of transition flange 3 can be used to accommodate different sizes of hydraulic pump 102, thereby improving the applicability of this device.

[0063] Example 4: The basic content is the same as in Example 3, except that: The reference flange 4 is annular in shape, and a reference flange through hole 41 is provided at the center of the reference flange 4. The reference flange 4 is coaxially connected to the annular protrusion 31, and the reference flange through hole 41 has the same diameter as the transition flange through hole 31.

[0064] In application, the reference flange 4 is used to transition the coaxiality of the motor shaft 101 and the hydraulic pump 102. Since the shaft extension of the large-displacement hydraulic pump 102 is usually splined rather than a full circle, when the dial indicator 103 is fixed on the motor shaft 101, it is impossible to detect the circular runout value of the shaft extension of the hydraulic pump 102 relative to the motor shaft 101. Therefore, the reference flange 4 is used for transition. In addition, the shaft extension of some hydraulic pumps 101 has a large circular runout relative to its stop, which can also be compensated by the reference flange 4.

[0065] The above description is only a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. Any equivalent modifications or changes made by those skilled in the art based on the content disclosed in the present invention should be included within the scope of protection set forth in the claims.

Claims

1. A coaxiality adjustment device for a motor-pump unit, characterized in that: The adjustment device includes a motor bushing (1), a spindle (2), a transition flange (3), a reference flange (4), and a pump support (5). The motor bushing (1) is cylindrical in shape. A motor shaft cavity (11) is provided at the center of the motor bushing (1). A rolling bearing (6) is coaxially arranged in the motor shaft cavity (11). The rolling bearing (6) is interference-fitted with the motor shaft cavity (11). The mandrel (2) is cylindrical in shape and is coaxially disposed in the inner hole (61) of the rolling bearing (6). The mandrel (2) and the inner hole (61) are interference fit. The pump support (5) includes a bottom support plate (51) and a vertical support plate (52). The bottom support plate (51) is connected to the horizontal plane by several bolts (54). The vertical support plate (52) is vertically connected to the bottom support plate (51). A transition hole (53) is provided on the vertical support plate (52). The axis of the transition hole (53) is located on the same horizontal line as the motor bushing (1). The transition flange (3) is coaxially connected to the reference flange (4) and is located in the transition hole (53). The motor shaft cavity (11) includes a large-diameter shaft cavity (111) and a small-diameter shaft cavity (112) connected in sequence. The large-diameter shaft cavity (111) extends from one end of the motor shaft sleeve (1) to the middle of the motor shaft sleeve (1), and the small-diameter shaft cavity (112) extends from the other end of the motor shaft sleeve (1) to the middle of the motor shaft sleeve (1). The rolling bearing (6) is disposed in the small-diameter shaft cavity (112).

2. The coaxiality adjustment device for a motor-pump unit according to claim 1, characterized in that: A left countersunk hole (211) is provided at the center of the left end face (21) of the mandrel (2), and a right countersunk hole (221) is provided at the center of the right end face (22) of the mandrel (2). A left bolt (212) is provided in the left countersunk hole (211), and a right bolt (222) is provided in the right countersunk hole (221).

3. The coaxiality adjustment device for a motor-pump unit according to claim 2, characterized in that: The mandrel (2) is provided with a left bearing locking baffle (7) and a right bearing locking baffle (8) at its two ends respectively. The left bearing locking baffle (7) is shaped like a disc. A baffle shaft through hole (71) is opened at the center of the left bearing locking baffle (7). Several through holes (72) are provided on the left bearing locking baffle (7) along its circumferential axis. The right bearing locking baffle (8) has the same structure as the left bearing locking baffle (7).

4. The coaxiality adjustment device for a motor-pump unit according to claim 3, characterized in that: The rolling bearing (6) includes an outer ring (62), an inner ring (63) and a plurality of balls (64). The outer ring (62) and the inner ring (63) are concentrically arranged, and the plurality of balls (64) are disposed between the outer ring (62) and the inner ring (63).

5. The coaxiality adjustment device for a motor-pump unit according to claim 4, characterized in that: The diameters of the left bearing locking baffle (7) and the right bearing locking baffle (8) are both greater than the inner hole (61) of the rolling bearing (6) and smaller than the outer diameter of the inner ring (63). The left bearing locking baffle (7) is coaxially connected to the spindle (2) by the left bolt (212) and fits against one side of the inner ring (63); the right bearing locking baffle (8) is coaxially connected to the spindle (2) by the right bolt (222) and fits against the other side of the inner ring (63).

6. A coaxiality adjustment device for a motor-pump unit according to any one of claims 1-5, characterized in that: The rolling bearings (6) are provided in a plurality of them, and the plurality of rolling bearings (6) are distributed in the motor shaft cavity (11) at a certain distance from each other. A bearing positioning ring (9) is provided between each pair of adjacent rolling bearings (6), and the bearing positioning ring (9) is sleeved on the spindle (2).

7. A coaxiality adjustment device for a motor-pump unit according to any one of claims 1-5, characterized in that: The outer ring surface of the motor bushing (1) is provided with a plurality of bushing through holes (12). The bushing through holes (12) extend from the outer ring surface of the motor bushing (1) toward the axis of the motor bushing (1) to the motor shaft cavity (11). Each bushing through hole (12) is provided with a bushing bolt (13).

8. The coaxiality adjustment device for a motor-pump unit according to claim 1, characterized in that: The transition flange (3) is annular in shape. A transition flange through hole (31) is provided at the center of the transition flange (3). An annular protrusion (32) is coaxially provided on one side of the transition flange (3). The outer diameter of the annular protrusion (32) matches the transition through hole (53). The annular protrusion (32) is embedded in the transition through hole (53).

9. The coaxiality adjustment device for a motor-pump unit according to claim 8, characterized in that: The reference flange (4) is annular in shape. A reference flange through hole (41) is provided at the center of the reference flange (4). The reference flange (4) is coaxially connected to the annular protrusion (32). The diameter of the reference flange through hole (41) is the same as that of the transition flange through hole (31).

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