Swash plate supporting structure of swash plate type plunger pump

Abstract

The invention discloses a swash plate supporting structure of a swash plate type plunger pump. The swash plate supporting structure comprises a shell, a check ring, an adjusting gasket and a rolling bearing. The shell comprises a bearing mounting hole, a retainer ring groove and a bearing seat; two coaxial bearing seats are integrally arranged on the mounting section of the shell and the plunger pump; a bearing mounting hole is formed in the axis of the bearing seat, and a check ring groove is formed in the bearing mounting hole and used for mounting a check ring; the rolling bearing is installed in the bearing installation hole, the rolling bearing and the bearing installation hole are in clearance fit, and the rolling bearing is limited through the check ring. When the swash plate is assembled, the outer circular shafts fixedly connected with the two radial ends of the swash plate are installed in inner ring holes of the two rolling bearings respectively and are in interference fit with the inner ring holes of the two rolling bearings. And the adjusting washer is arranged between the swash plate and the rolling bearing and is pressed and fixed by the swash plate and the rolling bearing. The working stability of the plunger pump under the vibration impact working condition can be improved, and vibration and noise of the plunger pump are reduced.

Description

Technical Field

[0001] The invention relates to the field of plunger pumps, and in particular to a swash plate support structure of a swash plate type plunger pump. Background Art

[0002] As an important device in the hydraulic system, the plunger pump is widely used in engineering machinery, aerospace and other fields. The swash plate is a key component in the plunger pump. Its supporting background involves many aspects such as the working principle of the plunger pump, the structure of the swash plate and its function.

[0003] The support mode of the swash plate is crucial to the performance and stability of the plunger pump. Common swash plate support modes include direct fixed support, sliding bearing support and rolling support. Direct fixed support is mainly used for constant inclination pumps. The swash plate can be directly fixed on the pump housing or pump cover, and cylindrical pins are used to prevent it from rotating. This support mode has a simple structure, but poor adjustment flexibility. The form of sliding bearing support is more commonly used in non-coaxial industrial swash plate pumps, but they require a large adjustment torque when the variable is variable, and are not suitable for occasions where the flow rate needs to be changed frequently. Rolling support has the advantages of compact structure and more sensitive response, small control dead zone and hysteresis, and can adapt to both horizontal and vertical arrangements of variable cylinders. This support mode has been most widely used in today's engineering machinery and aerospace fields, but its structure is usually non-standard special-shaped bearings, the positioning effect of the swash plate is not ideal, and the processing difficulty and processing cost are high. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides a swash plate support structure for a swash plate type plunger pump, which has the characteristics of compact structure, convenient processing and reliable operation.

[0005] The specific technical solutions are as follows:

[0006] A swash plate support structure of a swash plate type plunger pump, comprising: a housing, a retaining ring, an adjusting washer, and a rolling bearing; the housing comprises: a bearing mounting hole, a retaining ring groove, and a bearing seat;

[0007] The housing and the installation section of the plunger pump are integrally provided with two coaxial bearing seats; a bearing installation hole is provided at the axis center of the bearing seat, and a retaining ring groove is provided in the bearing installation hole for installing the retaining ring;

[0008] The rolling bearing is installed in the bearing installation hole, the two are clearance-matched, and the rolling bearing is limited by a retaining ring; when assembling the swash plate, the outer cylindrical shafts fixedly connected at the radial ends of the swash plate are respectively installed in the inner ring holes of the two rolling bearings and have an interference fit with them; the adjusting washer is installed between the swash plate and the rolling bearing, and is pressed and fixed by the two.

[0009] Furthermore, the rolling bearing comprises a bearing outer ring, a cylindrical roller, and a bearing inner ring which are coaxially arranged in sequence from outside to inside;

[0010] There are multiple cylindrical rollers, which are arranged in full rows along the circumferential direction between the outer ring of the bearing and the inner ring of the bearing;

[0011] An annular rib is provided on one side edge of the inner hole wall of the bearing outer ring, and a cutter recess is provided at the angle between the rib and the inner hole of the bearing outer ring;

[0012] A second annular rib is provided on one side edge of the outer circumferential surface of the inner ring of the bearing, and a second cutter recess is provided at an angle between the second rib and the outer circumferential surface of the inner ring of the bearing;

[0013] During assembly, the side of the bearing outer ring provided with the first rib and the side of the bearing inner ring provided with the second rib are both located outside the rolling bearing.

[0014] Furthermore, the swash plate includes an outer cylindrical shaft and three back-cut grooves; the outer cylindrical shaft is fixedly connected to both radial ends of the swash plate, and the three back-cut grooves are arranged at the angle between the outer cylindrical shaft and the end surface of the main structure of the swash plate.

[0015] Furthermore, a semicircular notch is provided at the upper end of the bearing seat on one side close to the axis of the shaft housing to facilitate the installation of the swash plate.

[0016] Furthermore, the retaining ring is an elastic retaining ring for a hole, and its structure is a ring with a gap.

[0017] Furthermore, the thickness range of the adjusting gasket is [H min ,H max ], H min and H max The calculation expression is as follows:

[0018]

[0019] Wherein, H1 represents the distance between the two retaining ring grooves on the housing, H2 represents the distance between the outer cylindrical shafts at both ends of the swash plate, H3 represents the sum of the thickness of one rolling bearing and the corresponding retaining ring, and H4 represents the sum of the thickness of the other rolling bearing and the corresponding retaining ring.

[0020] The beneficial effects of the present invention are:

[0021] (1) The present invention uses an adjusting washer to adjust the axial play clearance of the rolling bearing and the swash plate to a designed range, which can improve the working stability of the plunger pump under vibration and impact conditions, significantly reduce the vibration and noise of the plunger pump, and avoid damage to components under the inertial force during large impact vibration.

[0022] (2) The present invention integrates the bearing seat and the housing, and the bearing mounting hole is a complete circumferential hole, which improves the radial positioning effect of the bearing, thereby improving the working stability of the plunger pump.

[0023] (3) The bearings used in the present invention are standard cylindrical roller bearings, which can significantly reduce the processing difficulty and cost compared to special-shaped bearings. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 Schematic diagram of the swash plate support structure of a swash plate type plunger pump according to an embodiment of the present invention.

[0025] Figure 2 Schematic diagram of the three-dimensional structure of the shell according to an embodiment of the present invention.

[0026] Figure 3 Schematic diagram of the rolling bearing structure of an embodiment of the present invention, wherein (a) is a cross-sectional view of the assembled rolling bearing, (b) is an exploded schematic diagram of the rolling bearing, (c) is a cross-sectional view of the outer ring of the bearing, and (d) is a cross-sectional view of the inner ring of the bearing.

[0027] Figure 4 Schematic diagram of the swash plate structure of an embodiment of the present invention, wherein (a) is a three-dimensional structural schematic diagram and (b) is a cross-sectional view.

[0028] Figure 5 The following are dimension drawings corresponding to the parameters required for measuring and selecting the adjusting gaskets in the embodiment of the present invention, wherein (a) is a dimension drawing of the diameter of the retaining ring groove on the housing, (b) is a dimension drawing of the distance between the two end surfaces of the swash plate, (c) is a dimension drawing of the thickness of a rolling bearing plus a retaining ring, and (d) is a dimension drawing of the thickness of another rolling bearing plus a retaining ring.

[0029] Figure 6 Schematic diagram of the swash plate force according to an embodiment of the present invention.

[0030] In the figure, housing 1, retaining ring 2, adjusting washer 3, swash plate 4, rolling bearing 5; bearing mounting hole 101, retaining ring groove 102, semicircular notch 103, bearing seat 104; backing groove three 401, outer cylindrical shaft 402; bearing outer ring 501, cylindrical roller 502, bearing inner ring 503, backing groove one 50101, retaining edge one 50102, retaining edge two 50301, backing groove two 50302. DETAILED DESCRIPTION

[0031] The present invention will be described in detail below according to the accompanying drawings and preferred embodiments, and the purpose and effect of the present invention will become more clear. The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0032] like Figure 1 , Figure 2 As shown, a swash plate support structure of a swash plate type piston pump includes: a housing 1, a retaining ring 2, an adjusting washer 3, and a rolling bearing 5.

[0033] The housing 1 includes: a bearing mounting hole 101, a retaining ring groove 102, a semicircular notch 103, and a bearing seat 104. Two coaxial bearing seats 104 are integrated on the mounting section of the housing 1 and the plunger pump. This integrated structural design reduces the assembly error of the parts on the one hand, and improves the working stability of the plunger pump on the other hand. A bearing mounting hole 101 is provided at the axis of the bearing seat 104, and a retaining ring groove 102 is provided in the bearing mounting hole 101 for installing a retaining ring 2; the retaining ring 2 is preferably an elastic retaining ring for a hole, and its structure is a notched ring. The rolling bearing 5 is installed in the bearing mounting hole 101, and the two are clearance-fitted, and the rolling bearing 5 is limited by the retaining ring 2. The outer cylindrical shaft 402 fixedly connected at both radial ends of the swash plate 4 is respectively installed in the inner ring holes of the two rolling bearings 5, and is fixedly connected with them by interference fit. The adjusting washer 3 is installed between the swash plate 4 and the rolling bearing 5 and is pressed and fixed by the two, and is used to adjust the play clearance between the swash plate 4 and the rolling bearing 5 to prevent the swash plate 4 from radial movement.

[0034] like Figure 3 As shown, the rolling bearing 5 is a split structure, including a bearing outer ring 501, a cylindrical roller 502, and a bearing inner ring 503, which are coaxially arranged from outside to inside. There are multiple cylindrical rollers 502, which are arranged in full rows along the circumferential direction between the bearing outer ring 501 and the bearing inner ring 503, and no cage is provided to ensure that a large load can be borne.

[0035] An annular rib 50102 is provided on one side edge of the inner hole wall of the bearing outer ring 501 to limit the axial position of the cylindrical roller 502, and a tool withdrawal groove 50101 is provided at the angle between the rib 50102 and the inner hole of the bearing outer ring 501 to facilitate grinding of the inner hole of the bearing outer ring 501 during fine machining and avoid interference with the cylindrical roller 502 at the angle.

[0036] A second annular rib 50301 is provided on one side edge of the outer circumferential surface of the bearing inner ring 503 to limit the axial position of the cylindrical roller 502, and a second tool withdrawal groove 50302 is provided at the angle between the second rib 50301 and the outer circumferential surface of the bearing inner ring 503 to facilitate the grinding of the outer circle of the bearing inner ring 503 during fine machining and avoid interference with the cylindrical roller 502 at the angle.

[0037] During assembly, the side of the bearing outer ring 501 provided with the first rib 50102 and the side of the bearing inner ring 503 provided with the second rib 50301 are both located outside the rolling bearing 5, and the cylindrical roller 502 is axially limited from two directions.

[0038] like Figure 4 As shown, the swash plate 4 includes, in addition to the outer cylindrical shaft 402 fixedly connected to the radial ends of the swash plate 4, a third undercut groove 401. The third undercut groove 401 is provided at the angle between the outer cylindrical shaft 402 and the end surface of the main structure of the swash plate 4 to facilitate grinding of the outer cylindrical shaft 402 during fine machining and avoid interference between the bearing inner ring 503 and the swash plate 4 at the angle.

[0039] The following describes the assembly process of the swash plate 4 and the swash plate support structure of the swash plate type plunger pump, which specifically includes the following steps:

[0040] (1) First, measure the distance H1 between the two retaining ring grooves 102 on the housing 1, the distance H2 between the outer cylindrical shafts 402 at both ends of the swash plate 4, and the sum of the thicknesses H3 and H4 of the corresponding retaining rings 2 of the two rolling bearings 5, and then calculate H max =(H1-H2-H3-H4-0.1) / 2, H min =(H1-H2-H3-H4-0.2) / 2, the thickness range of the adjusting gasket 3 is [H min ,H max ].

[0041] Two sets of adjusting washers 3 are respectively selected and arranged on the outer cylindrical shafts 402 at the left and right ends of the swash plate 4. Each set includes a plurality of adjusting washers 3. The number of superimposed washers is selected according to the actual situation to adapt to different clearances between the swash plate 4 and the rolling bearing 5. The thickness of the two sets is H m , H n , and satisfies H max ≥H m ≥H min , H max ≥H n ≥H min ; m = 1, 2, ..., M, n = 1, 2, ..., N, M is the total number of adjusting washers 3 included in one group, and N is the total number of adjusting washers 3 included in the other group. According to actual conditions, the total thickness difference of the adjusting washers 3 respectively superimposed on the outer cylindrical shafts 402 at both ends of the swash plate 4 cannot exceed 0.02 mm. In this embodiment, if Figure 5 As shown, the measured values ​​are H1 = 120 mm, H2 = 93 mm, H3 = H4 = 13.4 mm, and the calculated values ​​are H max =0.05mm, H min =0.

[0042] (2) First, the two selected sets of adjustment washers 3 are respectively mounted on the outer cylindrical shafts 402 at both ends of the swash plate 4, and then the two bearing inner rings 503 are respectively pressed onto the outer cylindrical shafts 402 of the swash plate 4 until the adjustment washers 3 are tightened and the retaining edge 50301 of the bearing inner ring 503 of the rolling bearing 5 is ensured to face the axial direction of the housing 1.

[0043] (3) The swash plate 4 equipped with the bearing inner ring 503 is fixed in the bearing mounting hole 101 using a tool, and then the bearing outer rings 501 and cylindrical rollers 502 of the two rolling bearings 5 ​​are respectively installed in the bearing mounting hole 101 from both ends of the bearing seat 104 to achieve interference fit.

[0044] (4) Install two retaining rings 2 in the retaining ring grooves 102 on the bearing seat 104 from both ends of the bearing seat 104 to limit the rolling bearing 5.

[0045] like Figure 6 As shown, after the swash plate 4 is assembled on the supporting structure, it is mainly subjected to three loads F, F1, and F2 from top to bottom (active loads), and the supporting forces F3 and F4 (passive loads) of the rolling bearing 3 on the swash plate 4 from bottom to top. It can be seen that the load position on the housing is mainly the lower semicircular arc on the bearing seat 104 corresponding to the semicircular notch 103. Based on this force analysis, a semicircular notch 103 can be milled on the upper end of the side of the bearing seat 104 close to the axis of the shaft housing 1 to facilitate the installation of the swash plate 4 and reduce the weight.

[0046] Those skilled in the art can understand that the above are only preferred examples of the invention and are not intended to limit the invention. Although the invention is described in detail with reference to the above examples, those skilled in the art can still modify the technical solutions recorded in the above examples or replace some of the technical features therein with equivalents. Any modification, equivalent replacement, etc. made within the spirit and principle of the invention shall be included in the protection scope of the invention.

Claims

1. A swash plate support structure for a swash plate type plunger pump, characterized in that: include: Housing, retaining ring, adjusting washer, rolling bearing; the housing comprises: bearing mounting hole, retaining ring groove, bearing seat; The housing and the installation section of the plunger pump are integrally provided with two coaxial bearing seats; a bearing installation hole is provided at the axis center of the bearing seat, and a retaining ring groove is provided in the bearing installation hole for installing the retaining ring; The rolling bearing is installed in the bearing installation hole, the two are clearance-matched, and the rolling bearing is limited by a retaining ring; when assembling the swash plate, the outer cylindrical shafts fixedly connected at the radial ends of the swash plate are respectively installed in the inner ring holes of the two rolling bearings and have an interference fit with them; the adjusting washer is installed between the swash plate and the rolling bearing, and is pressed and fixed by the two.

2. The swash plate support structure of the swash plate type plunger pump according to claim 1, characterized in that: The rolling bearing comprises a bearing outer ring, a cylindrical roller, and a bearing inner ring which are coaxially arranged in sequence from outside to inside; There are multiple cylindrical rollers, which are arranged in full rows along the circumferential direction between the outer ring of the bearing and the inner ring of the bearing; An annular rib is provided on one side edge of the inner hole wall of the bearing outer ring, and a cutter recess is provided at the angle between the rib and the inner hole of the bearing outer ring; A second annular rib is provided on one side edge of the outer circumferential surface of the inner ring of the bearing, and a second cutter recess is provided at an angle between the second rib and the outer circumferential surface of the inner ring of the bearing; During assembly, the side of the bearing outer ring provided with the first rib and the side of the bearing inner ring provided with the second rib are both located outside the rolling bearing.

3. The swash plate support structure of the swash plate type plunger pump according to claim 1, characterized in that: The swash plate comprises an outer cylindrical shaft and three back-cut grooves; the outer cylindrical shaft is fixedly connected to the radial ends of the swash plate, and the three back-cut grooves are arranged at the angle between the outer cylindrical shaft and the end surface of the main structure of the swash plate.

4. The swash plate support structure of the swash plate type plunger pump according to claim 1, characterized in that: A semicircular notch is arranged on the upper end of one side of the bearing seat close to the axis of the shaft housing to facilitate the installation of the swash plate.

5. The swash plate support structure of the swash plate type plunger pump according to claim 1, characterized in that: The retaining ring is an elastic retaining ring for a hole, and its structure is a ring with a gap.

6. The swash plate support structure of a swash plate type plunger pump according to claim 1, characterized in that: The thickness range of the adjusting gasket is [H min ,H max ], H min and H max The calculation expression is as follows: Wherein, H1 represents the distance between the two retaining ring grooves on the housing, H2 represents the distance between the outer cylindrical shafts at both ends of the swash plate, H3 represents the sum of the thickness of one rolling bearing and the corresponding retaining ring, and H4 represents the sum of the thickness of the other rolling bearing and the corresponding retaining ring.

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