A swash plate support structure for a swash plate type piston pump

Abstract

The application discloses a swash plate support structure of a swash plate type plunger pump, which comprises a shell, a check ring, an adjusting washer and a rolling bearing; the shell comprises a bearing mounting hole, a check ring groove and a bearing seat; two coaxial bearing seats are integrally arranged on the mounting section of the shell; a bearing mounting hole is formed at the shaft center of the bearing seat, and a check ring groove is formed in the bearing mounting hole to mount the check ring; the rolling bearing is mounted in the bearing mounting hole, and the rolling bearing is in clearance fit with the bearing mounting hole and is limited by the check ring; when the swash plate is assembled, the outer circle shafts fixed at the two ends of the swash plate in the radial direction are respectively mounted in the inner circle holes of the two rolling bearings and are in interference fit with the inner circle holes; the adjusting washer is mounted between the swash plate and the rolling bearing and is tightly fixed by the swash plate and the rolling bearing. The application can improve the working stability of the plunger pump under the vibration and impact working condition and reduce the vibration and noise of the plunger pump.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of plunger pump, in particular to a swash plate support structure of swash plate type plunger pump. BACKGROUND

[0002] As an important device in hydraulic system, plunger pump has a wide application in engineering machinery and aerospace fields, and the swash plate is a key component of the plunger pump, and its support background involves the working principle of the plunger pump, the structure of the swash plate and its function, etc.

[0003] The support mode of the swash plate is crucial to the performance and stability of the plunger pump, and the common swash plate support modes mainly include direct fixed support, sliding bearing support and rolling support. The direct fixed support is mainly used for constant angle quantitative pump, and the swash plate can be directly fixed on the pump shell or the pump cover, and a cylindrical pin is used to prevent it from rotating. This support mode has a simple structure, but the flexibility of adjustment is poor. The sliding bearing support is mainly applied to the non-coaxial industrial swash plate pump, but they need a large torque to adjust the variable, and are not suitable for occasions where the flow needs to be frequently changed. The rolling support has the advantages of compact structure and sensitive response, and has small control dead zone and hysteresis, and can be adapted to the horizontal and vertical arrangement of the variable cylinder. This support mode is most widely used in the fields of engineering machinery and aerospace, but its structure is usually a non-standard special-shaped bearing, and the positioning effect of the swash plate is not ideal, and the processing difficulty and cost are high. SUMMARY

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

[0005] The specific technical solutions are as follows:

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

[0007] The housing is integrally provided with two coaxial bearing seats on the mounting section of the plunger pump; a bearing mounting hole is formed at the shaft center of the bearing seat, and a check ring groove is formed in the bearing mounting hole for mounting the check ring;

[0008] The rolling bearing is mounted in the bearing mounting hole, and the two are gap fitted and limited by the check ring; when the swash plate is assembled, the outer circle shafts fixed at the two radial ends of the swash plate are respectively mounted in the inner circle holes of the two rolling bearings and are in interference fit with them; the adjusting washer is mounted between the swash plate and the rolling bearing and is tightly fixed by them.

[0009] Further, the rolling bearing comprises a bearing outer ring, a cylindrical roller and a bearing inner ring arranged coaxially in sequence from outside to inside.

[0010] The cylindrical roller is in plurality and is arranged in full circumferential direction between the bearing outer ring and the bearing inner ring.

[0011] One side edge of the inner hole wall surface of the bearing outer ring is provided with an annular retaining edge one, and a tool withdrawal groove one is arranged at the included angle between the retaining edge one and the inner hole of the bearing outer ring.

[0012] One side edge of the outer circumferential surface of the bearing inner ring is provided with an annular retaining edge two, and a tool withdrawal groove two is arranged at the included angle between the retaining edge two and the outer circumferential surface of the bearing inner ring.

[0013] During assembly, the side of the bearing outer ring provided with the retaining edge one and the side of the bearing inner ring provided with the retaining edge two are both located at the outer side of the rolling bearing.

[0014] Further, the swash plate comprises an outer circular shaft and a tool withdrawal groove three; the outer circular shaft is fixedly connected at the radial two ends of the swash plate, and the tool withdrawal groove three is arranged at the included angle between the outer circular shaft and the end surface of the main structure of the swash plate.

[0015] Further, the bearing seat is provided with a semicircular notch at the upper end of the side close to the shaft axis of the bearing shell, facilitating the installation of the swash plate.

[0016] Further, the retaining ring adopts a hole elastic retaining ring, which has a notched annular structure.

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

[0018]

[0019] In the formula, H1 represents the distance between the two retaining ring grooves on the shell, H2 represents the distance between the outer circular shafts at the two ends of the swash plate, H3 represents the sum of the thicknesses of one rolling bearing and the corresponding retaining ring, and H4 represents the sum of the thicknesses of the other rolling bearing and the corresponding retaining ring.

[0020] The beneficial effects of the present application are as follows:

[0021] (1) The adjusting washer is used to adjust the axial movement clearance of the rolling bearing and the swash plate to the design range, which can improve the working stability of the plunger pump under vibration and impact working conditions, significantly reduce the vibration and noise of the plunger pump, and avoid damage caused by the inertial force of the components under large impact vibration.

[0022] (2) The bearing seat and the shell are designed as a whole, 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 bearing adopted in the application is a standard cylindrical roller bearing, which can significantly reduce the processing difficulty and cost compared with a special-shaped bearing. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is a schematic view of the swash plate support structure of the swash plate type plunger pump of the embodiment of the application.

[0025] Figure 2 It is a schematic view of the three-dimensional structure of the shell of the embodiment of the application.

[0026] Figure 3 It is a schematic view of the rolling bearing structure of the embodiment of the application, wherein (a) is a sectional view of the assembled rolling bearing, (b) is an exploded schematic view of the rolling bearing, (c) is a sectional view of the bearing outer ring, and (d) is a sectional view of the bearing inner ring.

[0027] Figure 4 It is a schematic view of the swash plate structure of the embodiment of the application, wherein (a) is a schematic view of the three-dimensional structure, and (b) is a sectional view.

[0028] Figure 5 It is a size marking drawing corresponding to the parameters required for the adjustment of the gasket, wherein (a) is a size marking drawing of the diameter of the retainer groove on the shell, (b) is a size marking drawing of the distance between the two end faces of the swash plate, (c) is a size marking drawing of the thickness of one rolling bearing plus a retainer, and (d) is a size marking drawing of the thickness of another rolling bearing plus a retainer.

[0029] Figure 6 It is a schematic view of the force on the swash plate of the embodiment of the application.

[0030] In the figure, the shell 1, the retainer 2, the adjustment gasket 3, the swash plate 4, the rolling bearing 5; the bearing mounting hole 101, the retainer groove 102, the semicircular notch 103, the bearing seat 104; the tool withdrawal groove three 401, the outer circular shaft 402; the bearing outer ring 501, the cylindrical roller 502, the bearing inner ring 503, the tool withdrawal groove one 50101, the retainer one 50102, the retainer two 50301, the tool withdrawal groove two 50302. DETAILED DESCRIPTION

[0031] The purpose and effect of the application will become more apparent in the following detailed description of the application according to the drawings and preferred embodiments, and the application will be further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the application and do not limit the application.

[0032] As Figure 1 , Figure 2 indicated, a swash plate support structure of a swash plate type plunger pump includes a housing 1, a check ring 2, an adjusting washer 3, and a rolling bearing 5.

[0033] The housing 1 includes a bearing mounting hole 101, a check ring groove 102, a semicircular notch 103, and a bearing seat 104. The housing 1 is integrally provided with two coaxial bearing seats 104 on the mounting section of the plunger pump. This integrated structure design reduces the assembly error of parts and improves the working stability of the plunger pump. The bearing mounting hole 101 is provided at the shaft center of the bearing seat 104, and the check ring groove 102 is provided in the bearing mounting hole 101 for mounting the check ring 2. The check ring 2 is preferably a hole elastic check ring, which has a notched annular structure. The rolling bearing 5 is mounted in the bearing mounting hole 101 and is gap-fitted with the bearing mounting hole 101, and the rolling bearing 5 is limited by the check ring 2. The outer circular shaft 402 fixedly connected to the two ends of the swash plate 4 in the radial direction is respectively mounted in the inner ring hole of the two rolling bearings 5 and is fixedly connected to the inner ring hole by interference fit. The adjusting washer 3 is mounted between the swash plate 4 and the rolling bearing 5 and is tightly fixed by the swash plate 4 and the rolling bearing 5, which is used to adjust the play gap between the swash plate 4 and the rolling bearing 5 and avoid the radial movement of the swash plate 4.

[0034] As Figure 3 indicated, the rolling bearing 5 has a split structure, which includes a bearing outer ring 501, a cylindrical roller 502, and a bearing inner ring 503 arranged coaxially from outside to inside. The cylindrical roller 502 has a plurality of rollers arranged between the bearing outer ring 501 and the bearing inner ring 503 in the circumferential direction, and does not have a retainer to ensure that it can bear a larger load.

[0035] One side edge of the inner hole wall surface of the bearing outer ring 501 is provided with an annular stop edge one 50102 for axially limiting the cylindrical roller 502. A relief groove one 50101 is provided at the included angle between the stop edge one 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 finishing and avoid interference at the included angle with the cylindrical roller 502.

[0036] One side edge of the outer circumferential surface of the bearing inner ring 503 is provided with an annular stop edge two 50301 for axially limiting the cylindrical roller 502. A relief groove two 50302 is provided at the included angle between the stop edge two 50301 and the outer circumferential surface of the bearing inner ring 503 to facilitate grinding of the outer circle of the bearing inner ring 503 during finishing and avoid interference at the included angle with the cylindrical roller 502.

[0037] During assembly, one side of the bearing outer ring 501 provided with the stop edge one 50102 and one side of the bearing inner ring 503 provided with the stop edge two 50301 are both located on the outer side of the rolling bearing 5, which axially limits the cylindrical roller 502 from two directions.

[0038] As shown in Figure 4 , in addition to the outer shaft 402 fixed at the radial ends of the swash plate 4, the swash plate 4 also includes a tool withdrawal groove 401. The tool withdrawal groove 401 is provided at the angle between the outer shaft 402 and the end face of the main body structure of the swash plate 4, so as to facilitate grinding of the outer shaft 402 during finishing and avoid interference between the bearing inner ring 503 and the swash plate 4 at the angle.

[0039] The assembly process of the swash plate 4 and the swash plate support structure of the swash plate type piston pump will be described below, 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 shafts 402 at the two ends of the swash plate 4, and the sum H3 and H4 of the thicknesses of the two rolling bearings 5 and their corresponding retaining rings 2, respectively, and then calculate H max =(H1-H2-H3-H4-0.1) / 2, H min =(H1-H2-H3-H4-0.2) / 2, to obtain the thickness range of the adjusting washer 3 as [H min ,H max ].

[0041] Two sets of adjusting washers 3 are selected and arranged on the outer shafts 402 at the left and right ends of the swash plate 4, respectively, each set including a plurality of adjusting washers 3, and the number of stacked pieces is selected according to the actual situation to adapt to different clearances between the swash plate 4 and the rolling bearing 5. The thicknesses of the two sets are H m and H n , and satisfy 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 in one set, and N is the total number of adjusting washers 3 in the other set. The total thickness difference of the adjusting washers 3 stacked on the outer shafts 402 at the two ends of the swash plate 4 according to the actual situation cannot exceed 0.02 mm. In this embodiment, as shown in Figure 5 , H1=120 mm, H2=93 mm, H3=H4=13.4 mm are measured, and H max =0.05 mm, H min =0.

[0042] (2) First, the two sets of adjusting washers 3 selected are respectively sleeved on the outer shafts 402 at the two ends of the swash plate 4, and then the two bearing inner rings 503 are press-fitted on the outer shafts 402 of the swash plate 4 until the adjusting washers 3 are tightly pressed, and the retaining edge 2 50301 of the bearing inner ring 503 of the rolling bearing 5 is directed towards the axis direction of the housing 1.

[0043] (3) Fix the swash plate 4 containing the inner ring 503 of the bearing in the bearing mounting hole 101 using a tooling, and then install the outer ring 501 and cylindrical roller 502 of the two rolling bearings 5 ​​from both ends of the bearing housing 104 into the bearing mounting hole 101 to achieve an interference fit.

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

[0045] like Figure 6 As shown, after the swashplate 4 is assembled on the support structure, it mainly bears three loads (active loads) from top to bottom: F, F1, and F2, and the supporting forces F3 and F4 (passive loads) from the rolling bearing 3 from bottom to top on the swashplate 4. Therefore, the load-bearing location 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 flat on the upper end of the side of the bearing seat 104 near the axis of the housing 1 to facilitate the installation of the swashplate 4 and reduce weight.

[0046] It will be understood by those skilled in the art that the above descriptions are merely preferred examples of the invention and are not intended to limit the invention. Although the invention has been described in detail with reference to the foregoing examples, those skilled in the art can still modify the technical solutions described in the foregoing examples or make equivalent substitutions for some of the technical features. All modifications and equivalent substitutions made within the spirit and principles of the invention should be included within the scope of protection of the invention.

Claims

1. A swash plate support structure for a swash plate type piston pump, characterized by, It comprises a housing, a check ring, an adjusting washer and a rolling bearing. The housing is provided with two coaxial bearing seats on the mounting section of the plunger pump. The rolling bearing is installed in the bearing mounting hole and is in clearance fit with the bearing mounting hole, and the check ring is used to limit the rolling bearing. When the swash plate is assembled, the outer shafts fixed to the radial ends of the swash plate are installed in the inner hole of the two rolling bearings and are in interference fit with the inner hole.

2. The swash plate support structure for a swash plate type piston pump according to claim 1, characterized by The adjusting washer is installed between the swash plate and the rolling bearing and is tightly fixed by the swash plate and the rolling bearing. The rolling bearing comprises a bearing outer ring, a cylindrical roller and a bearing inner ring arranged coaxially from outside to inside. The cylindrical roller is arranged between the bearing outer ring and the bearing inner ring in full circumferential arrangement. The inner hole wall surface of the bearing outer ring is provided with an annular stop edge one on one side edge. The outer circumferential surface of the bearing inner ring is provided with an annular stop edge two on one side edge.

3. The swash plate support structure for a swash plate type piston pump according to claim 1, wherein During assembly, the side of the bearing outer ring provided with the stop edge one and the side of the bearing inner ring provided with the stop edge two are located on the outside of the rolling bearing.

4. The swash plate support structure for a swash plate type piston pump according to claim 1, characterized by The swash plate comprises an outer shaft and a tool withdrawal groove three.

5. The swash plate support structure for a swash plate type piston pump according to claim 1, wherein The outer shaft is fixed to the radial ends of the swash plate, and the tool withdrawal groove three is arranged at the angle between the outer shaft and the end surface of the main structure of the swash plate.

6. The swash plate support structure for a swash plate type piston pump according to claim 1, wherein The thickness of the adjustment washer ranges from [H min , H max ] to [H min and H max ] and the calculation expression is as follows: ； ； The bearing seat is provided with a semicircular notch on the upper end of the side close to the axis of the housing, which facilitates the installation of the swash plate. The check ring is an elastic check ring with a notch. In the formula, H1 represents the distance between the two check ring grooves on the housing, H2 represents the distance between the outer shafts at the two ends of the swash plate, H3 represents the sum of the thicknesses of one rolling bearing and the corresponding check ring, and H4 represents the sum of the thicknesses of the other rolling bearing and the corresponding check ring.

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