Pressure release valve calibration ring press-in device

Abstract

The utility model relates to a pressure release valve calibration ring press-in device which comprises an installation rod, a spring, a lining, an inner sleeve and an outer shell. Two ends of the spring abut against the mounting rod and the inner sleeve; the lining is installed in the outer shell and forms a moving pair with the inner sleeve. One end of the mounting rod penetrates through the inner sleeve and the calibration ring and is coaxially matched with the positioning rod; the outer shell is fixedly connected with the mounting rod; when one end of the inner sleeve is pressed on the oil pump, the calibration ring is located in the pre-installation hole, and the axis coincides with the axis of the pressure release valve hole. Compared with the prior art, the inner sleeve is used for pressing the oil pump body, and it is guaranteed that the oil pump body is in a straight state; a positioning ring at the front end of the inner sleeve is inserted into a pre-mounting hole above a pressure release valve hole, so that the axis of the press-in device is consistent with the axis of the valve hole; the mounting rod and the positioning rod are coaxially matched to ensure that the axes coincide; and the circumferential surface of the calibration ring can be effectively fixed by the clamping jaw and the annular spring, so that the calibration ring is firmly attached to the end surface of the pressure head.

Description

Technical Field

[0001] The utility model relates to the assembly of a high-pressure oil pump, in particular to a pressure relief valve calibration ring pressing device. Background Art

[0002] The press-fitting of the calibration ring of the pressure relief valve is a key step in the assembly of the new generation of high-pressure oil pumps, and plays a vital role in the stability of the spring force test of the pressure relief valve. Since the part needs to be fixed on the end face of the pressure head before press-fitting, the press-fitting device currently used on the production line is a pressure head with a small hole on the end face, but this tooling has certain limitations. First, since the calibration ring is a ring-shaped structure with a through hole in the middle, the surface area available for vacuum suction is relatively small, so sometimes it will fall off after adsorption. Second, when the oil pump body is placed on the base manually, there will sometimes be some gaps, causing a certain tilt, which will cause uneven local force on the calibration ring. Third, the position of the pressure relief valve hole sometimes has a certain deviation due to the accuracy of machining, causing the calibration ring to be eccentric during press-fitting and severe force on one side. Fourth, there is a positioning rod in the pressure relief valve hole. This part is in direct contact with the pressure relief valve spring below. Since the positioning rod and the valve hole are clearance-fitted, when the calibration ring is pressed into the pressure relief valve hole, the positioning rod cannot be accurately fixed in the center position of the pressure relief valve hole, which will cause the pressure relief valve spring to tilt to a certain extent in the valve hole, resulting in unstable pressure relief valve spring force test.

[0003] After searching, the authorization announcement number CN209424886U discloses a sleeve press-fitting mechanism, which specifically discloses: including a connecting sleeve, a pressure head, and a positioning shaft, one end of the positioning shaft extends to the outside of the pressure head, and the other end of the positioning shaft extends to the inside of the connecting sleeve. One end of the positioning shaft located inside the connecting sleeve is connected to a reset spring, and one end of the reset spring abuts against the top of the connecting sleeve. A plurality of clamping mechanisms are fixed in the pressure head, and the clamping mechanisms abut against the sleeve workpiece in the positioning shaft. A cylinder is fixed in the connecting sleeve, and the output shaft of the cylinder faces the clamping mechanism, and when the output shaft of the cylinder abuts the clamping mechanism, the clamping mechanism loosens the sleeve workpiece in the positioning shaft. However, this prior art cannot achieve press-fitting positioning.

[0004] In summary, how to design a pressure relief valve calibration ring pressing device that can stably adsorb the calibration ring and accurately position it is a technical problem that needs to be solved. Utility Model Content

[0005] The purpose of the utility model is to provide a pressure relief valve calibration ring pressing device in order to overcome the defect of inaccurate calibration ring pressing and positioning in the prior art.

[0006] The purpose of the utility model can be achieved through the following technical solutions:

[0007] According to one aspect of the utility model, a pressure relief valve calibration ring pressing device is provided, which is used for pressing the calibration ring into the pressure relief valve hole of an oil pump, wherein a positioning rod is provided in the pressure relief valve hole, and the pressing device comprises a mounting rod, a spring, a bushing, an inner sleeve and an outer shell, wherein the outer surface of the mounting rod is sleeved with a spring and an inner sleeve; one end of the spring abuts against the mounting rod, and the other end is coaxially connected to the inner sleeve; one end of the mounting rod passes through the inner sleeve and the calibration ring, and is coaxially matched with the positioning rod; the outer shell is sleeved on the outside of the spring and is fixedly connected to the mounting rod; the bushing is installed in the outer shell and forms a moving pair with the inner sleeve; a pre-installation hole is provided on the pressure relief valve hole, and a positioning ring is provided at one end of the inner sleeve close to the calibration ring, and when the inner sleeve is pressed on the oil pump, the positioning ring is located in the pre-installation hole and its axis coincides with the axis of the pressure relief valve hole.

[0008] As a preferred technical solution, the mounting rod includes a mounting shaft and a pressure head, one end of the mounting shaft is coaxially mounted with the pressure head, and the other end of the pressure head passes through the inner sleeve and the calibration ring and is coaxially matched with the positioning rod; the outer shell is fixedly connected to the mounting shaft.

[0009] As a preferred technical solution, the installation shaft and the pressure head are hollow inside, one end of the pressure head is connected to the installation shaft, and the end face of the other end is provided with a suction hole connected to the inside of the pressure head, and a positioning pin is provided in the center; the suction hole is in contact with the end face of the calibration ring, and the positioning pin passes through the calibration ring and cooperates coaxially with the positioning rod.

[0010] As a preferred technical solution, the device further comprises a straight-through joint, which is installed on the installation shaft and connects the inside and the outside of the installation shaft.

[0011] As a preferred technical solution, the positioning pin is tapered; the positioning rod is provided with a central through hole, which is tapered and matches the positioning pin.

[0012] As a preferred technical solution, the device also includes clamps and annular springs. There are at least two clamps that are evenly distributed around the circumference and clamp the calibration ring. The annular spring is sleeved on the outside of the clamps and is in a stretched state.

[0013] As a preferred technical solution, a step is provided on the installation shaft, and a positioning groove is provided at one end of the inner sleeve; one end of the spring abuts against the end surface of the step, and the other end abuts in the positioning groove.

[0014] As a preferred technical solution, the outer shell includes an outer sleeve and a cover plate, one end of the outer sleeve is connected to the step on the mounting shaft, and the other end is mounted with the cover plate, and the sleeve and the outer sleeve form a moving pair.

[0015] As a preferred technical solution, the step and the cover plate are both provided with mounting holes, and the outer sleeve is connected to the step and the cover plate via threaded connectors.

[0016] As a preferred technical solution, a clamping handle is provided at one end of the installation shaft away from the pressure head.

[0017] Compared with the prior art, the utility model has the following beneficial effects:

[0018] 1) The utility model spring is connected with the inner sleeve, and the inner sleeve can be used to position the spring axis without deflection; a moving pair is formed between the bushing and the inner sleeve, and the end face of the inner sleeve is used to press the oil pump body when the mounting rod is pressed down, eliminating the gap between the two to ensure that the oil pump body is in an upright state; the positioning ring at the front end of the inner sleeve is inserted into the pre-installed hole above the pressure relief valve hole, so that the axis of the pressing device is consistent with the axis of the valve hole, eliminating the situation of severe unilateral force caused by the eccentricity of the press-fitting; the mounting rod and the positioning rod are coaxially matched to ensure that the axis coincides;

[0019] 2) The utility model performs vacuum adsorption on the calibration ring through the small hole on the end face of the pressure head, so that the calibration ring can be stably installed;

[0020] 3) The clamping jaws and the annular spring of the utility model can effectively fix the circumferential surface of the calibration ring, so that it fits firmly with the end surface of the pressure head, avoiding the phenomenon of falling due to unstable adsorption;

[0021] 4) The tapered pin at the front end of the pressure head of the utility model can pass through the central through hole of the calibration ring and be embedded in the central through hole of the positioning rod below. The tapered pin and the tapered surface of the central through hole cooperate with each other to effectively fix the positioning rod at the center position of the pressure relief valve hole, thereby achieving the purpose of correcting the position of the pressure relief valve spring and improving the stability of the pressure relief valve spring force test. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the overall structure of a pressure relief valve calibration ring press-in device of the utility model;

[0023] Figure 2 This is an exploded view of a pressure relief valve calibration ring press-in device of the utility model;

[0024] Figure 3 This is a front view of a pressure head of a pressure relief valve calibration ring pressing device of the utility model;

[0025] Figure 4 It is a top view of a pressure head of a pressure relief valve calibration ring pressing device of the utility model;

[0026] Figure 5 This is a cross-sectional view of a pressure relief valve calibration ring press-in device of the utility model;

[0027] Figure 6 This is a partial structural diagram of one end of the inner sleeve of the utility model;

[0028] The numbers in the figure show:

[0029] 1. Mounting rod, 11. Mounting shaft, 111. Suction hole, 112. Positioning pin, 113. Step, 114. Clamping handle, 12. Press head, 2. Spring, 3. Bushing, 4. Inner sleeve, 41. Positioning groove, 42. Positioning ring, 5. Outer shell, 51. Outer sleeve, 52. Cover plate, 6. Straight joint, 7. Clamping claw, 8. Ring spring, 9. Mounting hole. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of them. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0031] The oil pump body is provided with a pressure relief valve hole, a positioning rod is provided in the pressure relief valve hole, the calibration ring needs to be pressed into the pressure relief valve hole, and a pre-installation hole is also provided in the pressure relief valve hole. Figure 1 As shown, the utility model provides a pressure relief valve calibration ring pressing device, including a mounting rod 1, a spring 2, a bushing 3, an inner sleeve 4, a straight joint 6, a clamping claw 7, an annular spring 8 and an outer shell 5.

[0032] like Figure 2 As shown, the mounting rod 1 includes a mounting shaft 11 and a pressure head 12, and the mounting shaft 11 and the pressure head 12 are hollow inside. The pressure head 12 is coaxially mounted on one end of the mounting shaft 11, and threaded holes are provided on the mounting shaft 11 and the pressure head 12. The mounting shaft 11 and the pressure head 12 are connected by a threaded connector, and the two are internally connected; the other end of the mounting shaft 11 is provided with a clamping handle 114, which is used to clamp the device for pressing parts on the production line, and is also provided with a step 113, and the step 113 is provided with a mounting hole 9. Figure 3 and Figure 4 As shown, a suction hole 111 and a positioning pin 112 are provided on the end face of the pressure head 12 away from the mounting shaft 11. The positioning pin 112 is located at the center of the end face and is conical. It passes through the center hole of the calibration ring. A center through hole is provided on the positioning rod, and the center through hole is also conical. The positioning pin 112 cooperates with the center through hole to ensure that the positioning rod is located at the center of the pressure relief valve hole; the suction holes 111 are located around the positioning pin 112 and contact with the end face of the calibration ring. As shown in the figure, eight suction holes 111 are evenly distributed around the circumference, and the suction holes 111 are connected to the inside of the pressure head 12.

[0033] A through hole is provided on the installation shaft 11, and the straight-through joint 6 is connected to the through hole, connecting the interior of the installation shaft 11 with the vacuum machine. When the vacuum machine is working, the interior of the installation shaft 11 and the pressure head 12 is in a vacuum state, and the suction hole 111 on the end face of the pressure head 12 adsorbs the calibration ring on the end face of the pressure head 12.

[0034] The spring 2 is sleeved on the outer surface of the installation shaft 11 , with one end of the spring 2 abutting against the end surface of the step 113 of the installation shaft 11 , and the other end of the spring 2 abutting against the positioning groove 41 of the inner sleeve 4 .

[0035] The bushing 3 is sleeved on the outer surface of the inner sleeve 4, and a moving pair is formed between the bushing 3 and the inner sleeve 4. Figure 5 As shown, one end of the bushing 3 is limited in movement by the cover plate 52 , and the other end is limited in movement by a protrusion of the outer shell 5 close to one end of the positioning groove 41 .

[0036] One end of the inner sleeve 4 for mounting the spring 2 is provided with a positioning groove 41, the spring 2 is pressed against the positioning groove 41, and the axis of the spring 2 is positioned. The other end is provided with a positioning ring 42, which contacts the calibration ring. Figure 6 During press-fitting, the inner sleeve 4 is pressed onto the oil pump body, and the positioning ring 42 is located in the pre-installed hole 9, with the axis coinciding with the axis of the pressure relief valve hole.

[0037] There are at least two clamping jaws 7. Figure 2 As shown in the figure, there are three of them, which are evenly distributed around the circumference and clamped in the circumferential direction of the calibration ring. The annular spring 8 is sleeved on the outside of the clamping jaw 7 and is in a stretched state, so that the clamping jaw 7 firmly fixes the calibration ring and fits tightly with the end face of the pressure head 12.

[0038] The outer shell 5 includes an outer sleeve 51 and a cover plate 52. One end of the outer sleeve 51 is connected to the step 113 of the mounting shaft 11, and the other end is installed on the cover plate 52. A moving pair is formed between the bushing 3 and the outer sleeve 51. Both the step 113 of the mounting shaft 11 and the cover plate 52 are provided with mounting holes 9, and both ends of the outer sleeve 51 are also provided with mounting holes 9. The mounting shaft 11, the outer sleeve 51 and the cover plate 52 are connected by threaded connectors.

[0039] The utility model has the following advantages:

[0040] First, while the pressure head 12 uses the suction hole 111 on the end face to vacuum the calibration ring, the three clamping claws 7 and the annular spring 8 can effectively fix the circumferential surface of the part, so that it fits firmly with the end face of the pressure head 12 to avoid falling due to unstable adsorption; second, when the device is pressed down, the end face of the inner sleeve 4 is used to press the oil pump body, eliminating the gap between it and the base to ensure that the oil pump body is in an upright state. At the same time, the positioning ring 42 at the front end of the inner sleeve 4 is inserted into the pre-installed hole 9 above the pressure relief valve hole, so that the axis of the pressing device is consistent with the axis of the pressure relief valve hole, eliminating the situation of severe unilateral force caused by the eccentricity of the press-fitting; third, during the press-fitting process, the tapered pin at the front end of the pressure head 12 can pass through the central through hole of the calibration ring and be embedded in the central through hole of the positioning rod below, and then the positioning rod is effectively fixed at the center position of the pressure relief valve hole through the tapered pin and the tapered surface of the central through hole. The purpose of correcting the position of the pressure relief valve spring and improving the stability of the pressure relief valve spring force test is achieved.

[0041] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the utility model, and these modifications or replacements should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A pressure relief valve calibration ring pressing device, used for pressing a calibration ring into a pressure relief valve hole of an oil pump, wherein a positioning rod is provided in the pressure relief valve hole, characterized in that: The press-in device comprises a mounting rod (1), a spring (2), a bushing (3), an inner sleeve (4) and an outer shell (5); the outer surface of the mounting rod (1) is sleeved with the spring (2) and the inner sleeve (4); one end of the spring (2) abuts against the mounting rod (1), and the other end is coaxially connected to the inner sleeve (4); one end of the mounting rod (1) passes through the inner sleeve (4) and the calibration ring, and is coaxially matched with the positioning rod; the outer shell (5) is sleeved on the outside of the spring (2) and is fixedly connected to the mounting rod (1); the bushing (3) is installed in the outer shell (5) and forms a moving pair with the inner sleeve (4); a pre-installation hole is provided on the pressure relief valve hole, and a positioning ring (42) is provided at one end of the inner sleeve (4) close to the calibration ring. When the inner sleeve (4) is pressed on the oil pump, the positioning ring (42) is located in the pre-installation hole and its axis coincides with the axis of the pressure relief valve hole.

2. A pressure relief valve calibration ring pressing device according to claim 1, characterized in that: The mounting rod (1) comprises a mounting shaft (11) and a pressure head (12); one end of the mounting shaft (11) is coaxially mounted with the pressure head (12); the other end of the pressure head (12) passes through the inner sleeve (4) and the calibration ring and is coaxially matched with the positioning rod; the outer shell (5) is fixedly connected to the mounting shaft (11).

3. A pressure relief valve calibration ring pressing device according to claim 2, characterized in that: The installation shaft (11) and the pressure head (12) are hollow inside; one end of the pressure head (12) is connected to the installation shaft (11); the end surface of the other end is provided with a suction hole (111) connected to the inside of the pressure head (12); a positioning pin (112) is provided at the center; the suction hole (111) contacts the end surface of the calibration ring; the positioning pin (112) passes through the calibration ring and is coaxially matched with the positioning rod.

4. A pressure relief valve calibration ring pressing device according to claim 3, characterized in that: The device also comprises a straight-through joint (6), wherein the straight-through joint (6) is mounted on the mounting shaft (11) and is connected to the inside and outside of the mounting shaft (11).

5. A pressure relief valve calibration ring pressing device according to claim 3, characterized in that: The positioning pin (112) is conical; the positioning rod is provided with a central through hole, which is conical and matches the positioning pin (112).

6. A pressure relief valve calibration ring pressing device according to claim 1, 3 or 4, characterized in that: The device also includes a clamping jaw (7) and an annular spring (8), wherein the clamping jaws (7) are at least two and are evenly distributed around the circumference of the calibration ring and the annular spring (8) is sleeved outside the clamping jaws (7) and is in a stretched state.

7. A pressure relief valve calibration ring pressing device according to claim 2, characterized in that: The mounting shaft (11) is provided with a step (113), and one end of the inner sleeve (4) is provided with a positioning groove (41); one end of the spring (2) abuts against the end surface of the step (113), and the other end abuts in the positioning groove (41).

8. A pressure relief valve calibration ring pressing device according to claim 7, characterized in that: The outer shell (5) comprises an outer sleeve (51) and a cover plate (52); one end of the outer sleeve (51) is connected to a step (113) on the mounting shaft (11), and the other end is mounted with the cover plate (52); the bushing (3) and the outer sleeve (51) form a moving pair.

9. A pressure relief valve calibration ring pressing device according to claim 8, characterized in that: The step (113) and the cover plate (52) are both provided with mounting holes (9), and the outer sleeve (51) is connected to the step (113) and the cover plate (52) via threaded connectors.

10. A pressure relief valve calibration ring pressing device according to claim 2, characterized in that: A clamping handle (114) is provided at one end of the installation shaft (11) away from the pressure head (12).

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