Positioning tool for machining high-pressure pump roller tappet shell

Abstract

The utility model relates to the technical field of high-pressure pump roller tappet machining, in particular to a positioning tool for machining a high-pressure pump roller tappet shell. One end of the sliding shaft is in axial sliding connection with the base, and the other end of the sliding shaft is provided with an expanded abutting head; the multiple chucks are arranged around the sliding shaft, and the tail end of each chuck is provided with a first inclined face facing the sliding shaft and an outer abutting face used for abutting against the inner side of the wall face of the shell. Due to the fact that the outer shell is connected to the outer portion of the clamping head in a sleeved mode, outer circle turning and pin hole machining can be conveniently carried out, secondary positioning is not needed, and the perpendicularity of the pin hole and the outer circle is guaranteed. The machining tool is small in size and can be conveniently integrated in turning equipment and drilling equipment, and automatic integrated machining is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of high-pressure pump roller tappet processing, in particular to a positioning tool used for processing a high-pressure pump roller tappet housing. Background Art

[0002] High-pressure pump roller tappets are components of high-pressure fuel pump systems and are widely used in automotive engines equipped with these systems. Installed between the drive cam and the tappet, they convert the cam's rotational motion into linear reciprocating motion, simultaneously moving the tappet.

[0003] The main structure of the high-pressure pump roller tappet includes a housing, a bracket, a roller and a pin. The housing of the high-pressure pump roller tappet is provided with a pin hole for installing the pin, such as Figure 1 As shown. The processing technology for the pin hole of the guide sleeve during processing mainly adopts the die stamping process. This process requires mold opening and has high requirements on mold precision, resulting in high costs. At the same time, the use of die stamping has the problem of secondary positioning, which affects the perpendicularity between the pin hole and the outer circle of the shell and ultimately affects the performance of the part.

[0004] In the prior art, for example, the "Automatic Clamping Device for Grinding Pin Holes in High-Pressure Oil Pump Tappets," published in Chinese patent literature with publication number CN111037383A, comprises a positioning plate, a clamping block and a positioning block arranged relative to each other on the positioning plate, and the clamping block is movable relative to the positioning block; the pressing surface of the positioning block also has a retractable positioning pin. After machining the pin hole, the positioning pin is used to position the pin hole, and the outer diameter of the housing is ground to ensure the pin hole's perpendicularity to the outer diameter. This means that secondary positioning is required after machining the pin hole. Furthermore, the device can only be used for grinding or turning the outer diameter and cannot be used for machining pin holes. Utility Model Content

[0005] The purpose of the utility model is to solve the problem that in the existing process, different devices need to be used and secondary positioning needs to be performed when turning or grinding the outer circle and processing the pin hole of the high-pressure pump roller tappet housing, and to provide a positioning tool that can simultaneously turn the outer circle and process the pin hole.

[0006] The technical solution provided by the utility model is as follows: a positioning tool for machining a high-pressure pump roller tappet housing, comprising:

[0007] base;

[0008] a sliding shaft axially slidably connected to the base, one end of the sliding shaft being axially elastically connected to the base, and the other end being provided with an inflated abutment, the abutment being axially abutted against the inner side of the bottom surface of the housing facing away from the end of the sliding shaft;

[0009] A chuck connected to the base, wherein a plurality of chucks are provided and arranged around the sliding shaft, and a first inclined surface facing the sliding shaft and an outer abutting surface for abutting the inner side of the wall of the shell are provided at the ends of all chucks;

[0010] a butting device for butting the shell against the butting head from the outside of the bottom surface of the shell;

[0011] When the sliding shaft slides axially, it has a first sliding position in which the abutment head abuts against the first inclined surface and the outer abutment surface radially abuts against the inner side of the wall of the shell, and a second sliding position in which the abutment head is away from the first inclined surface and the outer abutment surface is away from the inner side of the wall. In the first sliding position, the ends of all the chucks can be extended into the shell together.

[0012] When not in use, the positioning fixture is in the second sliding position. At this time, the sliding shaft is in a state of extending in a direction away from the base under the action of elasticity, and the ends of all the chucks can be extended into the housing together;

[0013] When in use, the outer shell is sleeved on the outer abutment surfaces at the ends of all the chucks, and then the top connection device is used to continuously move the outer shell toward the base along the axial direction. During this process, the outer shell first abuts against the abutment head; then the top connection device continues to push the abutment head and the sliding shaft toward the base, so that the abutment head abuts against the first inclined surface; finally, the abutment head slides along the first inclined surface while pushing the chuck radially outward, so that the outer abutment surface of the chuck abuts against the inner side of the wall of the outer shell, completing the fixation of the outer shell.

[0014] Since the shell is sleeved on the outside of the chuck, it is convenient to turn the outer circle and pin hole without the need for secondary positioning, ensuring the perpendicularity of the pin hole and the outer circle; the processing tooling is small in size and can be easily integrated into the turning equipment and drilling equipment to achieve automated integrated processing.

[0015] Preferably, the abutment head is provided with a second inclined surface having the same inclination angle as the first inclined surface on one side connected to the sliding shaft, and when the sliding shaft slides to the first sliding position, the second inclined surface abuts against the first inclined surface.

[0016] Preferably, the base is provided with through slots distributed axially along the sliding shaft, wherein a screw plug is provided in the through slot and threadedly connected to the through slot, and the screw plug is elastically connected to the sliding shaft. During installation, the screw plug is installed from the bottom of the base, and the axial position of the sliding shaft is adjusted by adjusting the screw plug.

[0017] Preferably, the base is provided with a through groove distributed axially along the sliding shaft, a screw plug is provided in the through groove and is threadedly connected to the through groove, a locking nut is axially slidably connected in the through groove, the locking nut is threadedly connected to the sliding shaft, and the screw plug is elastically connected to the locking nut.

[0018] The sliding shaft slides in the through groove through the locking nut, thereby improving the stability of the sliding shaft and reducing the wear of the sliding shaft caused by sliding.

[0019] Preferably, the screw plug and the locking nut are directly elastically connected via one or more disc springs. Since the disc spring has a small axial volume and a large load, the use of the disc spring can carry sufficient load while reducing the volume of the base.

[0020] Preferably, a prefabricated hole is provided on the outer abutting surface of the chuck, wherein the prefabricated hole corresponds to the pin hole of the housing, so as to prevent the drill bit from wearing the chuck during drilling.

[0021] Preferably, in the first sliding position, all the chucks abut against each other, and the base of the chucks is provided with a circumferential groove. The abutment between the chucks improves the axial torsional resistance, and the grooves ensure that the chucks can still move in the radial direction.

[0022] Preferably, four chucks are provided, and the four outer abutting surfaces are surrounded to form a shape that is compatible with the interior of the shell.

[0023] Preferably, the base is provided with an axial mounting hole. In order to facilitate turning the outer circle of the housing, the processing fixture is mounted to the main shaft of the rotating device through the mounting hole of the base.

[0024] Preferably, the jacking device includes a jack rod and a cylinder for driving the jack rod.

[0025] Compared with the existing technology, the present invention has the following beneficial effects:

[0026] Since the shell is sleeved on the outside of the chuck, the outer circle and pin hole can be turned conveniently without the need for secondary positioning, ensuring the perpendicularity of the pin hole and the outer circle;

[0027] The processing tooling is small in size and can be easily integrated into turning equipment and drilling equipment to achieve automated integrated processing;

[0028] The screw plug is installed from the bottom of the base, and the axial position of the sliding shaft can be adjusted by adjusting the screw plug. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is a three-dimensional schematic diagram of the shell;

[0030] Figure 2This is a three-dimensional schematic diagram of the first sliding position of the first embodiment of the present invention;

[0031] Figure 3 This is a side view schematic diagram of the first embodiment of the present utility model;

[0032] Figure 4 This is a cross-sectional schematic diagram of the first sliding position of the first embodiment of the present invention;

[0033] Figure 5 for Figure 4 An enlarged schematic diagram of point A in FIG.

[0034] Figure 6 This is a three-dimensional schematic diagram of the second sliding position of the first embodiment of the present invention;

[0035] Figure 7 This is a cross-sectional diagram of the first embodiment of the present invention in the second sliding position;

[0036] Figure 8 for Figure 7 Schematic diagram of the enlarged view of point B.

[0037] Explanation of the accompanying drawings: base 1, through groove 11, screw plug 12, locking nut 13, disc spring 14, mounting hole 15, sliding shaft 2, abutment head 21, second inclined surface 211, chuck 3, first inclined surface 31, outer abutment surface 32, prefabricated hole 321, groove 33, push rod 4, outer shell 5, bottom surface 51, wall surface 52, pin hole 53. DETAILED DESCRIPTION

[0038] The following further describes the specific embodiments of the present invention in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present invention and are not intended to limit the present invention.

[0039] For ease of description and understanding, the axial, circumferential, and radial directions herein are all based on the axis of the sliding shaft 2 .

[0040] Example 1, as Figures 1-8 As shown, a positioning tool for machining a high-pressure pump roller tappet housing includes:

[0041] Base 1;

[0042] The sliding shaft 2 is axially slidably connected to the base 1. One end of the sliding shaft 2 is axially elastically connected to the base 1, and the other end is provided with an expanded abutment 21. The abutment 21 is axially abutted against the inner side of the bottom surface 51 of the housing 5 at the end facing away from the sliding shaft 2.

[0043] A chuck 3 is connected to the base 1. There are multiple chucks 3 arranged around the sliding shaft 2. The ends of all chucks 3 are provided with a first inclined surface 31 facing the sliding shaft 2 and an outer abutting surface 32 for abutting the inner side of the wall 52 of the housing 5.

[0044] A push-on device, used to push the housing 5 against the abutment head 21 from the outside of the bottom surface 51 of the housing 5, including a push rod 4 and a cylinder for driving the push rod 4;

[0045] When sliding axially, the sliding shaft 2 has a first sliding position in which the abutment head 21 abuts the first inclined surface 31 and the outer abutment surface radially abuts the inner side of the wall surface 52 of the housing 5, and a second sliding position in which the abutment head 21 is away from the first inclined surface 31 and the outer abutment surface 32 is away from the inner side of the wall surface 52. In the first sliding position, the distal ends of all the chucks 3 can be extended into the housing 5 together. The abutment head 21 is provided with a second inclined surface 211 on the side connected to the sliding shaft 2, with the same inclination angle as the first inclined surface 31. When the sliding shaft 2 slides toward the base 1 to the first sliding position, the second inclined surface 211 abuts the first inclined surface 31.

[0046] When not in use, the positioning fixture is in the second sliding position, such as Figure 6-Figure 8 As shown, at this time, the sliding shaft 2 is in a state of extending in the direction away from the base 1 under the action of elasticity, and the ends of all the clamps 3 can be extended into the housing 5 together;

[0047] During use, the outer shell 5 is sleeved onto the outer abutment surfaces 32 at the ends of all the chucks 3, and the cylinder drives the push rod 4 to continuously move the outer shell 5 toward the base 11 along the axial direction until the outer shell 5 is pressed against the end of the sliding shaft 2. At the same time, the sliding shaft 2 stretches and tightens the chuck 3 to hold the outer shell 5. Specifically, during this process, the outer shell 5 first abuts against the abutment head 21; then the abutment device continues to push the abutment head 21 and the sliding shaft 2 toward the base 11, so that the second inclined surface 211 of the abutment head 21 abuts against the first inclined surface 31; finally, the abutment head 21 slides along the first inclined surface 31 while pushing the chuck 3 radially outward, so that the outer abutment surface 32 of the chuck 3 abuts against the inner side of the wall 52 of the outer shell 5, completing the fixing of the outer shell 5 and being in the first sliding position, as shown in FIG. Figure 2-Figure 5 shown.

[0048] Since the shell 5 is sleeved on the outside of the chuck 3, it is convenient to perform turning of the outer circle and the pin hole 53 and other shell processing procedures without the need for secondary positioning, thereby ensuring the perpendicularity of the pin hole 53 and the outer circle; the processing tooling is small in size and can be easily integrated into the turning equipment and drilling equipment to realize automated integrated processing.

[0049] The base 1 is provided with a through groove 11 distributed axially along the sliding shaft 2, and a screw plug 12 threadedly connected to the through groove 11 is provided in the through groove 11. A locking nut 13 is axially slidably connected in the through groove 11, and the locking nut 13 is threadedly connected to the sliding shaft 2. The screw plug 12 and the locking nut 13 are elastically connected by a disc spring 14. Two disc springs 14 are provided in this embodiment, and multiple disc springs 14 can also be provided as needed.

[0050] During installation, screw plug 12 is inserted from the bottom of base 1, and the axial position of sliding shaft 2 is adjusted by adjusting screw plug 12. Sliding shaft 2 slides within through slot 11 via lock nut 13, improving its stability and reducing wear caused by sliding. The entire sliding shaft 2 slides within the cavity formed by all the chucks 3 and through slot 11. Because disc spring 14 has a small axial volume and high load capacity, its use can support sufficient load while reducing the size of base 1.

[0051] The outer abutment surface 32 of the chuck 3 is provided with a prefabricated hole 321 facing the pin hole 53 of the housing 5. The prefabricated hole 321 corresponds to the pin hole 53 of the housing 5 to prevent the drill bit from wearing the chuck 3 during drilling.

[0052] In the first sliding position, all the chucks 3 abut against each other, and the base of the chucks 3 is provided with a circumferential groove 33. The abutment between the chucks 3 improves the axial torsional resistance, and the groove 33 ensures that the chucks 3 can still move in the radial direction.

[0053] Four chucks 3 are provided, and four outer abutment surfaces 32 are formed around to form a shape that matches the inside of the shell. The four chucks are arranged at the four corners corresponding to the shell 5 to facilitate cutting during processing.

[0054] An axial mounting hole 15 is provided on the base 11. In order to facilitate turning the outer circle of the housing 5, a machining fixture is mounted to the main shaft of a rotating device, such as a dividing head or other electric machinery, through the mounting hole 15 of the base 11.

[0055] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the specific details of the above embodiments. Within the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all fall within the scope of protection of the present invention.

Claims

1. A positioning tool for machining a high-pressure pump roller tappet housing, characterized in that: include: Base (1); A sliding shaft (2) is axially slidably connected to the base (1), one end of which is axially elastically connected to the base (1), and the other end of which is provided with a bulging abutment (21), wherein one end of the abutment (21) faces away from the sliding shaft (2) and axially abuts against the inner side of the bottom surface (51) of the housing (5); A chuck (3) connected to the base (1), wherein a plurality of chucks (3) are provided and are arranged around the sliding shaft (2), and the ends of all chucks (3) are provided with a first inclined surface (31) facing the sliding shaft (2) and an outer abutting surface (32) for abutting against the inner side of the wall surface (52) of the housing (5); A contact device for contacting the housing (5) against the contact head (21) from the outside of the bottom surface (51) of the housing (5); When the sliding shaft (2) slides axially, it has a first sliding position in which the abutment head (21) abuts against the first inclined surface (31) and the outer abutment surface radially abuts against the inner side of the wall surface (52) of the housing (5), and a second sliding position in which the abutment head (21) is away from the first inclined surface (31) and the outer abutment surface (32) is away from the inner side of the wall surface (52). In the first sliding position, the ends of all the chucks (3) can be extended into the housing (5) together.

2. The positioning tool for machining a high-pressure pump roller tappet housing according to claim 1, characterized in that: The abutment joint (21) is provided with a second inclined surface (211) having the same inclination angle as the first inclined surface (31) on one side connected to the sliding shaft (2); when the sliding shaft (2) slides to the first sliding position, the second inclined surface (211) abuts against the first inclined surface (31).

3. The positioning tool for machining a high-pressure pump roller tappet housing according to claim 1, characterized in that: The base (1) is provided with a through groove (11) distributed along the axial direction of the sliding shaft (2), and a screw plug (12) threadedly connected to the through groove (11) is provided in the through groove (11), and the screw plug (12) is elastically connected to the sliding shaft (2).

4. The positioning tool for machining a high-pressure pump roller tappet housing according to claim 1, characterized in that: The base (1) is provided with a through groove (11) distributed axially along the sliding shaft (2), a screw plug (12) is provided in the through groove (11) and is threadedly connected to the through groove (11), a locking nut (13) is axially slidably connected in the through groove (11), the locking nut (13) is threadedly connected to the sliding shaft (2), and the screw plug (12) and the locking nut (13) are elastically connected.

5. The positioning tool for machining a high-pressure pump roller tappet housing according to claim 4, characterized in that: The screw plug (12) and the locking nut (13) are directly elastically connected via one or more disc springs (14).

6. The positioning tool for machining a high-pressure pump roller tappet housing according to any one of claims 1 to 5, characterized in that: A prefabricated hole (321) is provided on the outer abutting surface (32) of the clamp (3).

7. The positioning tool for machining a high-pressure pump roller tappet housing according to any one of claims 1 to 5, characterized in that: In the first sliding position, all the clamps (3) abut against adjacent clamps (3), and the roots of the clamps (3) are provided with circumferential grooves (33).

8. The positioning tool for machining a high-pressure pump roller tappet housing according to any one of claims 1 to 5, characterized in that: Four clamps (3) are provided, and the four outer abutment surfaces (32) are surrounded to form a shape that matches the interior of the shell.

9. The positioning tool for machining a high-pressure pump roller tappet housing according to any one of claims 1 to 5, characterized in that: An axial mounting hole (15) is provided on the base (11).

10. The positioning tool for machining a high-pressure pump roller tappet housing according to any one of claims 1 to 5, characterized in that: The jacking device comprises a jack rod (4) and a cylinder for driving the jack rod (4).

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