A diesel engine fuel injection pump bore chamfering tool

Abstract

The utility model discloses a diesel engine fuel injection pump inner hole chamfer tool, including the handle, the handle is from the head to the tail along the axial extension, the head of handle is equipped with the tool rest, the outer peripheral edge of tool rest is equipped with at least three cutters, the cutter is along the circumferential interval distribution of tool rest, the cutter has the oblique cutting edge, and the cutting edge of multiple cutters is located on the same conical surface with the axis of handle as center, the handle is equipped with the locating ring behind tool rest, the locating ring is sleeved on the handle, the locating ring has the outer peripheral support surface with the axis of handle coaxial, and the tail of handle forms the drive end for exerting the moment. The utility model can manually chamfer the orifice on the spot, and it is unnecessary to transport the fuel injection pump back to the machine tool for repair. The tool utilizes the upper end inner hole positioning of fuel injection pump, ensures that the orifice chamfer is coaxial with the inner hole. It is convenient, quick, and greatly improves the work efficiency on the spot.

Description

Technical Field

[0001] This utility model is applicable to the field of diesel engine processing, and in particular relates to a chamfering tool for the inner bore of a diesel engine fuel injection pump. Background Technology

[0002] When assembling a fuel injection pump, the pump core needs to be installed in the pump's inner bore. However, during installation, the rubber seal of the pump is often damaged because the chamfer of one of the inner bore openings is not properly aligned. The current practice is to transport the pump back to the machine tool for repair, which greatly reduces on-site work efficiency.

[0003] In summary, the problems existing in the relevant technologies urgently need to be solved. Utility Model Content

[0004] The purpose of this utility model is to at least solve one of the technical problems existing in the prior art, and to provide a chamfering tool for the inner hole of a diesel engine fuel injection pump.

[0005] The technical solution adopted by this utility model to solve its technical problem is:

[0006] A chamfering tool for the inner bore of a diesel engine fuel injection pump includes a handle extending axially from a head to a tail. The head of the handle has a tool holder, and the outer periphery of the tool holder has at least three cutting tools spaced apart circumferentially along the tool holder. Each cutting tool has an inclined cutting edge, and the cutting edges of the plurality of tools are located on the same conical surface centered on the axis of the handle. A positioning ring is provided behind the tool holder, and the positioning ring is fitted onto the handle. The positioning ring has an outer periphery support surface coaxial with the axis of the handle. The tail of the handle forms a driving end for applying torque.

[0007] In some implementations, the head of the tool holder is provided with a threaded section, the tool holder is provided with a first limiting step surface on the rear side of the threaded section, the middle part of the tool holder is provided with an axial hole, the axial hole of the tool holder is installed in the tool holder, and is axially locked to the first limiting step surface by a nut provided in the threaded section.

[0008] In some implementations, in conjunction with the above methods, a first positioning pin is provided between the tool holder and the tool holder.

[0009] In some implementations, in conjunction with the above methods, the cutting tools are welded to the tool holder, and grinding is performed to make the cutting edges of the multiple cutting tools lie on the same conical surface centered on the axis of the tool holder.

[0010] In some implementations, the front edge of the tool holder is provided with a chamfered conical surface, and the tool is welded to the chamfered conical surface.

[0011] In some implementations, in conjunction with the above implementations, the tool holder is provided with a large-diameter support section between the tool holder and the positioning ring. The front end of the large-diameter support section forms a first limiting step surface, and the rear end of the large-diameter support section forms a second limiting step surface. The tool holder is provided with a limiting member at a certain distance on the rear side of the second limiting step surface, and the positioning ring is provided between the limiting member and the second limiting step surface.

[0012] In some implementations, the limiting member includes a second positioning pin disposed on the tool holder, and the tail of the positioning ring is provided with a radial flange for limiting the axial displacement of the tool holder.

[0013] In some implementations, in conjunction with the above implementations, the positioning ring includes an inner positioning ring connected to the tool holder and an outer positioning ring forming the outer peripheral support surface, with a roller provided between the inner positioning ring and the outer positioning ring.

[0014] In some implementations, the drive end of the tool holder is provided with a handle extending perpendicularly to both sides of the tool holder, and the handle is threadedly connected to the threaded hole of the tool holder.

[0015] In some implementations, the drive end of the tool holder is formed into a square head for connecting to an electric gun, in combination with the above implementations.

[0016] One of the above technical solutions has at least one of the following advantages or beneficial effects: During use, the chamfering tool is mounted on the inner bore of the fuel injection pump, and positioning is achieved by utilizing the cooperation between the upper inner bore of the fuel injection pump and the outer peripheral support surface of the positioning ring, ensuring that the chamfering tool does not deviate to one side during inner bore chamfering. A torque is applied manually or with an electric gun to the drive end of the tool holder, rotating the tool holder and causing the tool holder to rotate, while axial pressure is applied simultaneously, causing the tool holder to drive the cutting tool to cut the edge of the inner bore opening, thereby chamfering the inner bore.

[0017] The advantage of this utility model lies in its ability to manually chamfer the injection pump opening on-site when the rubber seal is damaged due to a sharp edge (due to improper machining) at the injection pump's disassembly and assembly site. This eliminates the need to transport the injection pump back to the machine tool for rework. The tool utilizes the upper inner hole of the injection pump for positioning, ensuring that the chamfered opening is coaxial with the inner hole. It is convenient and quick to use, greatly improving on-site work efficiency.

[0018] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0019] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0020] Figure 1 This is a schematic diagram of one embodiment of the present invention. Detailed Implementation

[0021] This section will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but they should not be construed as limiting the scope of protection of the present utility model.

[0022] In this utility model, when directions (up, down, left, right, front, and back) are described, it is only for the convenience of describing the technical solution of this utility model, and does not indicate or imply that the technical features referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this utility model.

[0023] In this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," "exceeding," etc. are understood to exclude the stated number; "above," "below," "within," etc. are understood to include the stated number. In the description of this utility model, if "first" or "second" is used, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance or implicitly indicating the number of indicated technical features or the order of the indicated technical features.

[0024] In this utility model, unless otherwise explicitly defined, terms such as "set," "install," and "connect" should be interpreted broadly. For example, they can refer to a direct connection or an indirect connection through an intermediate medium; a fixed connection, a detachable connection, or an integrally formed connection; a mechanical connection, an electrical connection, or a connection capable of mutual communication; or the internal connection of two components or the interaction between two components. Those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model based on the specific content of the technical solution.

[0025] in, Figure 1 The reference direction coordinate system of this utility model embodiment is given below, in conjunction with Figure 1 The embodiments of this utility model will be described in the directions shown.

[0026] See Figure 1This utility model provides a chamfering tool for the inner bore of a diesel engine fuel injection pump, including a handle 1. The handle 1 extends axially from the head to the tail. The head of the handle 1 is provided with a tool holder 2. The outer peripheral edge of the tool holder 2 is provided with at least three cutting tools 3. The cutting tools 3 are distributed circumferentially along the tool holder 2. The cutting tools 3 have inclined cutting edges. The cutting edges of the multiple cutting tools 3 are located on the same conical surface centered on the axis of the handle 1. The handle 1 is provided with a positioning ring 4 behind the tool holder 2. The positioning ring 4 is fitted onto the handle 1. The positioning ring 4 has an outer peripheral support surface coaxial with the axis of the handle 1. When in use, the positioning ring 4 can support the fuel injection pump 5, thereby providing auxiliary positioning for the chamfering tool to process chamfers. The tail of the handle 1 forms a drive end for applying torque.

[0027] Combination Figure 1 When in use, the chamfering tool is installed in the inner hole of the fuel injection pump 5. The upper inner hole of the fuel injection pump 5 and the outer peripheral support surface of the positioning ring 4 are used to achieve gap positioning, ensuring that the chamfering tool does not deviate to one side during chamfering of the inner hole. A torque is applied manually or with an electric gun to the drive end of the tool holder 1, rotating the tool holder 1 and causing the tool holder 2 to rotate. Simultaneously, axial pressure is applied, causing the tool holder 2 to drive the cutting tool 3 to cut the edge 6 of the inner hole opening, thus chamfering the inner hole. During this process, at least three cutting tools 3, combined with inclined cutting edges, allow the chamfering tool to form multi-point support with the inner hole of the fuel injection pump 5, ensuring stable positioning and accurate cutting of the edge of the inner hole opening by the cutting tool 3.

[0028] The advantage of this utility model lies in its ability to address issues during the disassembly and assembly of the fuel injection pump 5. When the rubber seal is damaged due to a sharp edge (due to improper machining) at the inner bore opening, the tool can be used on-site to manually chamfer the opening, eliminating the need to transport the fuel injection pump 5 back to the machine tool for repair. This tool utilizes the upper inner bore of the fuel injection pump 5 for positioning, ensuring that the chamfered opening is coaxial with the inner bore. It is convenient and quick to use, greatly improving on-site work efficiency.

[0029] The tool holder 2 can be installed on the tool shank 1 by means of fasteners, snaps, threaded connections, etc. In some embodiments, see Figure 1 The tool holder 1 has a threaded section 7 at its head, and a first limiting step surface 8 on the rear side of the threaded section 7. The tool holder 2 has an axial hole in its middle, which is installed in the tool holder 1 and axially locked to the first limiting step surface 8 by a nut 9 located on the threaded section 7. In this embodiment, the tool holder 2 is fitted onto the tool holder 1 through the axial hole. The axial hole and the tool holder 1 work together to achieve radial positioning relative to the tool holder 1, while the nut 9 on the outer side provides axial locking. Installation is convenient, quick, and highly accurate.

[0030] Further, see Figure 1A first positioning pin 10 is provided between the tool holder 1 and the tool base 2. Based on the nut 9, the first positioning pin 10 further improves the fitting accuracy between the tool base 2 and the tool holder 1, and prevents the tool base 2 from rotating relative to the tool holder 1 during the chamfering process.

[0031] The cutting tool 3 can be mounted to the tool holder 2 by means of fasteners or welding. In some embodiments, the cutting tool 3 is welded to the tool holder 2, and the cutting edges of multiple cutting tools 3 are located on the same conical surface centered on the axis of the tool holder 1 by grinding. In this embodiment, the cutting edge is formed by first fixing the cutting tool 3 to the tool holder 2 and then performing grinding, which fully ensures the positional accuracy of the cutting tool 3 and avoids the influence of installation errors on the machining accuracy of the cutting tool 3.

[0032] In some embodiments, see Figure 1 The front edge of the tool holder 2 is provided with a chamfered conical surface, and the tool 3 is welded to the chamfered conical surface. In this embodiment, by providing a chamfered conical surface, the tool holder 2 can, on the one hand, provide an inclined mounting surface for the tool 3, so that the tool 3 can be mounted on the tool holder 2 with a roughly approximate inclination angle; on the other hand, it also allows the tool holder 2 to avoid the machining area of ​​the tool 3, thus avoiding interference with the cutting of the tool 3.

[0033] In some embodiments, see Figure 1 The tool holder 1 has a large-diameter support section 11 between the tool holder 2 and the positioning ring 4. The diameter of the large-diameter support section 11 is increased to form a support structure between the tool holder 2 and the positioning ring 4. Specifically, the front end of the large-diameter support section 11 forms a first limiting step surface 8, and the rear end of the large-diameter support section 11 forms a second limiting step surface 12. The tool holder 1 is provided with a limiting member at a certain distance on the rear side of the second limiting step surface 12, and the positioning ring 4 is provided between the limiting member and the second limiting step surface 12.

[0034] The limiting component includes a second positioning pin 13 disposed on the tool holder 1. The second positioning pin 13 is transversely inserted through the tool holder 1, with both ends protruding from the surface of the tool holder 1, providing axial limiting for the positioning ring 4.

[0035] In some embodiments, see Figure 1 The tail of the positioning ring 4 is provided with a radial flange 14 for limiting the axial displacement of the tool holder 1. In this embodiment, the radial flange 14 is provided at the tail of the positioning ring 4. With the help of the radial flange 14, it can cooperate with the end face of the fuel injection pump 5 after the chamfer is machined to a predetermined size to achieve axial limiting and avoid excessive chamfering.

[0036] In some embodiments, the positioning ring 4 includes an inner positioning ring connected to the tool holder 1 and an outer positioning ring forming an outer peripheral support surface, with rollers provided between the inner and outer positioning rings. In this embodiment, when machining chamfers, the outer positioning ring is supported by the fuel injection pump, while the inner positioning ring rotates with the tool holder 1. The rollers between the inner and outer positioning rings effectively improve the smoothness of the tool holder 1's rotation.

[0037] In some embodiments, see Figure 1 The drive end of the tool holder 1 is provided with a handle 15 extending perpendicularly to both sides of the tool holder 1, and the handle 15 is threaded into the threaded hole of the tool holder 1. In use, torque and axial pressure can be applied to the tool holder 1 through the handle 15. The handle 15 is threaded into the threaded hole of the tool holder 1, which facilitates disassembly and assembly.

[0038] In some embodiments, see Figure 1 The drive end of the handle 1 forms a square head 17 for connecting to the electric gun 16. During use, the square head 17 can be directly connected to the sleeve of the electric gun 16 to apply torque. In this embodiment, in conjunction with the handle 15, the chamfering tool has both manual and electric drive functions, making it convenient and quick to use, greatly improving on-site work efficiency.

[0039] In the description of this specification, references to terms such as "example," "embodiment," or "some embodiments" indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0040] Of course, the present invention is not limited to the above-described embodiments. Those skilled in the art can make equivalent modifications or substitutions without departing from the spirit of the present invention, and these equivalent modifications or substitutions are all included within the scope defined by the claims of this application.

Claims

1. A chamfering tool for the inner bore of a diesel engine fuel injection pump, characterized in that, The tool includes a handle extending axially from a head to a tail. The head of the handle has a tool holder, and the outer peripheral edge of the tool holder has at least three cutting tools spaced apart circumferentially along the tool holder. The cutting tools have inclined cutting edges, and the cutting edges of the plurality of cutting tools are located on the same conical surface centered on the axis of the handle. The handle has a positioning ring behind the tool holder, which is fitted onto the handle. The positioning ring has an outer peripheral support surface coaxial with the axis of the handle. The tail of the handle forms a drive end for applying torque.

2. The diesel engine fuel injection pump inner bore chamfering tool according to claim 1, characterized in that, The head of the tool holder is provided with a threaded section, and the tool holder is provided with a first limiting step surface on the rear side of the threaded section. The middle part of the tool holder is provided with an axial hole, and the axial hole of the tool holder is installed in the tool holder and locked axially to the first limiting step surface by a nut provided on the threaded section.

3. The diesel engine fuel injection pump inner bore chamfering tool according to claim 2, characterized in that, A first positioning pin is provided between the handle and the tool holder.

4. The diesel engine fuel injection pump inner bore chamfering tool according to claim 1, characterized in that, After the cutting tool is welded to the tool holder, the cutting edges of the multiple cutting tools are ground so that they are located on the same conical surface centered on the axis of the tool holder.

5. The diesel engine fuel injection pump inner bore chamfering tool according to claim 4, characterized in that, The front edge of the tool holder is provided with a chamfered conical surface, and the tool is welded to the chamfered conical surface.

6. The diesel engine fuel injection pump inner bore chamfering tool according to claim 2, characterized in that, The tool holder has a large-diameter support section between the tool holder and the positioning ring. The front end of the large-diameter support section forms a first limiting step surface, and the rear end of the large-diameter support section forms a second limiting step surface. The tool holder has a limiting member set at a certain distance on the rear side of the second limiting step surface, and the positioning ring is set between the limiting member and the second limiting step surface.

7. The diesel engine fuel injection pump bore chamfering tool according to claim 6, characterized in that, The limiting member includes a second positioning pin disposed on the tool holder, and the tail of the positioning ring is provided with a radial flange for limiting the axial displacement of the tool holder.

8. The diesel engine fuel injection pump inner bore chamfering tool according to claim 1, characterized in that, The positioning ring includes an inner positioning ring connected to the tool holder and an outer positioning ring forming the outer peripheral support surface, with a roller provided between the inner positioning ring and the outer positioning ring.

9. The diesel engine fuel injection pump inner bore chamfering tool according to claim 1, characterized in that, The drive end of the knife handle is provided with a handle that extends perpendicularly to both sides of the knife handle, and the handle is threadedly connected to the threaded hole of the knife handle.

10. The diesel engine fuel injection pump inner bore chamfering tool according to claim 1, characterized in that, The drive end of the knife handle is shaped into a square head for connecting to an electric gun.

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