A special gauge for the depth of the transverse hole of an oil injector body

Abstract

This utility model relates to a special gauge for measuring the depth of the transverse hole of an injector body, comprising a gauge body, a measuring rod, a dial indicator, a spring, and a calibration block. It employs a comparative measurement method, designing a corresponding calibration block based on the dimensions of the part being measured. The depth of the zeroing reference hole is the standard dimension of the transverse hole of the part. The measuring head is vertically pressed into the zeroing reference hole of the calibration block to zero the dial indicator before measuring the part. The bottom surface of the small diameter section is aligned with the outer ring of the hole, where the diameter of the bottom cross-section is equal to the diameter of the bottom surface of the small diameter section. This stabilizes the measuring head's position within the transverse hole of the part being measured, avoiding contact diameter drift caused by axial misalignment or surface morphology within the transverse hole, reducing measurement errors, and improving the production efficiency of injectors.

Description

Technical Field

[0001] This utility model relates to the field of fuel injector technology, and in particular to a special gauge for measuring the depth of the transverse hole in a fuel injector body. Background Technology

[0002] In the manufacturing process of engine injector body, controlling the depth of its internal transverse holes is crucial, as this dimension affects the accuracy and consistency of fuel injection. The measuring head of the traditional transverse hole depth gauge is conical, and the contact surface formed by its conical surface and inclined surface changes with the inclination angle of the inner axis of the hole and the surface morphology, making it impossible to stabilize its position and resulting in errors in measuring the depth of the hole.

[0003] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this disclosure, and therefore may include information that does not constitute prior art known to those skilled in the art. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model discloses a special gauge for measuring the depth of transverse holes in fuel injectors. This solves the problem that the measuring head of traditional special gauges for transverse hole depth is conical, and the contact surface formed by the conical surface and the inclined surface cannot be stabilized as the inclination angle of the hole axis and the surface morphology change, resulting in errors in measuring the depth of the hole.

[0005] The technical solution adopted in this utility model is as follows: A special gauge for measuring the depth of transverse holes in a fuel injector body, characterized in that it comprises: The fixture body has an insertion hole at its top and a connection hole at its bottom. The insertion hole and the connection hole are coaxial and connected. A measuring rod includes a rod section and a measuring head. The measuring head is located at the bottom end of the rod section. The measuring head includes a large-diameter section and a small-diameter section arranged coaxially. The small-diameter section is located at the bottom end of the large-diameter section. The bottom surface of the small-diameter section is a plane and perpendicular to the axis of the rod section. The rod section is slidably connected to a connecting hole. A dial indicator is installed in the socket, with the probe at the bottom of the dial indicator slidably connected to the socket and in contact with the top of the rod. A spring is sleeved on the outer side of the top end of the rod, with the upper and lower ends of the spring respectively abutting the top of the receiving hole and the outer side of the top end of the measuring head; The calibration block has a zero-calibration reference hole at the top.

[0006] A further technical solution is that a shoulder is provided on the outer side of the end of the rod near the dial indicator, and the lower end of the spring abuts against the shoulder.

[0007] A further technical solution is that the inner diameter of the connecting hole is smaller than the inner diameter of the insertion hole, a stepped portion is formed at the connection between the connecting hole and the insertion hole, and the top end of the spring abuts against the stepped portion.

[0008] A further technical solution is that the bottom end of the inspection fixture body is provided with a limiting ring, the limiting ring is detachably connected to the bottom end of the receiving hole, the limiting ring is axially provided with a through hole, the rod is slidably connected in the through hole, the measuring head extends out of the through hole, and the outer diameter of the shoulder is larger than the inner diameter of the through hole.

[0009] A further technical solution is that a insertion groove is provided at the bottom end of the connection hole, the limiting ring includes an insertion part and a bottom ring, the insertion part is located at the top end of the bottom ring, the through hole coaxially passes through the insertion part and the bottom ring, the insertion part is inserted into the insertion groove, and the outer side of the top end of the bottom ring abuts against the outer side of the bottom end of the inspection fixture body.

[0010] A further technical solution is that the top of the gauge body is provided with a dial clip and a locking bolt. The dial clip has an axial clamping groove, which is coaxial with the insertion hole. A locking hole is provided through the outer side of the dial clip, and the distance between the center line of the locking hole and the center line of the insertion hole is greater than the radius of the locking bolt. The locking bolt is installed in the locking hole to tighten the locking hole.

[0011] A further technical solution is that the calibration block includes an upper block and a lower block, the upper block is connected to the lower block by screws, and the zeroing reference hole is opened on the upper block.

[0012] A further technical solution is that the outer side of the upper block is provided with a plurality of first screw holes, and the outer side of the lower block is provided with a plurality of second screw holes that are coaxial with and match the first screw holes. The upper block and the lower block are fixedly connected by the first screw holes, the second screw holes and screws.

[0013] The beneficial effects of this utility model embodiment are as follows: (i) A special gauge for measuring the depth of transverse holes in an injector body includes a gauge body, a measuring rod, a dial indicator, a spring, and a calibration block. It adopts a comparative measurement method. The calibration block is designed according to the size of the part being measured. The depth of the zeroing reference hole is the standard size of the transverse hole of the part. The measuring head is pressed vertically into the zeroing reference hole of the calibration block to zero the dial indicator and then the part being measured is measured. The bottom surface of the small diameter section is fitted with the outer ring at the point where the diameter of the bottom cross section of the hole is equal to the diameter of the bottom surface of the small diameter section. This stabilizes the position of the measuring head in the transverse hole of the part being measured, avoids the drift of the contact diameter caused by the axial deviation or surface morphology in the transverse hole, reduces the measurement error, and improves the production efficiency of the injector.

[0014] (ii) Furthermore, a shoulder is provided on the outer side of the end of the rod near the dial indicator, and the lower end of the spring abuts against the shoulder. The shoulder ensures that the force of the lower end of the spring is accurately transmitted to the measuring rod, avoiding the spring directly pressing the side of the rod and causing jamming; at the same time, it limits the spring compression stroke, ensuring that the bottom surface of the small diameter section of the measuring head can fully extend out of the gauge body to contact the bottom of the transverse hole being measured when the measuring head is in the free state, and preventing the spring from being over-compressed and failing.

[0015] (iii) Furthermore, the inner diameter of the connecting hole is smaller than that of the insertion hole, and a stepped portion is formed at the connection between the connecting hole and the insertion hole, with the top of the spring abutting against the stepped portion. The stepped portion prevents the spring from moving upward, and the lower end of the spring presses against the shoulder to transmit pressure, ensuring that the spring only extends and contracts along the axial direction without radial offset, avoiding stroke resistance caused by off-center load, while limiting the maximum compression of the spring to protect the dial indicator probe, maintaining a constant contact force between the measuring head and the inclined surface at the bottom of the hole, and ensuring the stability of the measurement. Attached Figure Description

[0016] Figure 1 This is a front view schematic diagram of the special gauge for measuring the depth of the transverse hole in an oiler body according to this utility model.

[0017] Figure 2 This is a front view schematic diagram of the calibration block in a special gauge for measuring the depth of transverse holes in an oiler body according to this utility model.

[0018] Figure 3 This is a front view structural diagram of a special gauge for measuring the depth of transverse holes in an oiler body according to this utility model.

[0019] In the picture: 100. Gripper body; 101. Insertion hole; 102. Connection hole; 103. Gauge clamp; 104. Locking hole; 105. Stepped section; 106. Insertion groove; 200. Measuring rod; 210. Rod section; 211. Shoulder; 220. Measuring head; 221. Large diameter section; 222. Small diameter section; 300. Dial indicator; 400. Spring; 500. Calibration block; 510. Upper block; 520. Lower block; 530. Zeroing reference hole; 600. Limiting ring; 610. Insertion section; 620. Bottom ring; 630. Through hole; 700. Part to be measured; 701. Horizontal hole. Detailed Implementation

[0020] To further illustrate the technical means and effects adopted by this utility model in order to achieve the intended utility model purpose, the following detailed description of the specific implementation methods, structure, features and effects of this utility model is provided in conjunction with the accompanying drawings and preferred embodiments.

[0021] First embodiment: A special gauge for measuring the depth of transverse holes in an injector body includes a gauge body 100, a measuring rod 200, a dial indicator 300, a spring 400, and a calibration block 500. The gauge body 100 has an insertion hole 101 at its top and a connection hole 102 at its bottom. The insertion hole 101 and the connection hole 102 are coaxial and interconnected. The measuring rod 200 includes a rod portion 210 and a measuring head 220. The measuring head 220 is located at the bottom end of the rod portion 210 and includes a large-diameter section 221 and a small-diameter section 222 coaxially arranged. The small-diameter section 222 is located at the bottom end of the large-diameter section 221. The bottom surface of the small-diameter section 222 is planar and perpendicular to the axis of the rod portion 210, and the bottom diameter of the small-diameter section 222 is 2mm. The rod portion 210 is slidably connected within the connection hole 102. A dial indicator 300 is installed in the socket 101, and the probe at the bottom of the dial indicator 300 is slidably connected in the socket 101 and contacts the top of the rod 210. For example, the top of the gauge body 100 is provided with a clamp 103 and a locking bolt. The clamp 103 has an axially formed clamping groove, which is coaxial with the socket 101. A locking hole 104 is formed through the outer side of the clamp 103, and the distance between the center line of the locking hole 104 and the center line of the socket 101 is greater than the radius of the locking bolt. The locking bolt is installed in the locking hole 104 to tighten the locking hole 104. A spring 400 is sleeved on the outer side of the top of the rod 210, and the upper and lower ends of the spring 400 abut against the top of the receiving hole 102 and the outer side of the top of the measuring head 220, respectively. The top of the calibration block 500 is provided with a zeroing reference hole 530. For example, the calibration block 500 includes an upper block 510 and a lower block 520. The upper block 510 is connected to the lower block 520 by screws, and a zeroing reference hole 530 is formed on the upper block 510. A plurality of first screw holes are formed on the outer side of the upper block 510, and a plurality of second screw holes coaxial with and matching the first screw holes are formed on the outer side of the lower block 520. The upper block 510 and the lower block 520 are fixedly connected by the first screw holes, the second screw holes, and screws.

[0022] Furthermore, a shoulder 211 is provided on the outer side of the end of the rod 210 near the dial indicator 300, and the lower end of the spring 400 abuts against the shoulder 211. The shoulder 211 ensures that the force of the lower end of the spring 400 is accurately transmitted to the measuring rod 200, avoiding the spring 400 directly pressing the side of the rod 210 and causing jamming; at the same time, it limits the compression stroke of the spring 400, ensuring that the bottom surface of the small diameter section 222 of the measuring head 220 can fully extend out of the gauge body 100 to contact the bottom of the transverse hole 701 being measured when the measuring head 220 is in the free state, while preventing the spring 400 from being over-compressed and failing.

[0023] Furthermore, the inner diameter of the connecting hole 102 is smaller than the inner diameter of the insertion hole 101. A step portion 105 is formed at the connection between the connecting hole 102 and the insertion hole 101, and the top end of the spring 400 abuts against the step portion 105. The step portion 105 prevents the spring 400 from moving upward, and the lower end of the spring 400 presses against the shoulder 211 to transmit pressure, ensuring that the spring 400 only extends and contracts along the axial direction without radial offset, avoiding stroke resistance caused by off-center load, and at the same time limiting the maximum compression of the spring 400 to protect the probe of the dial indicator 300, maintaining a constant contact force between the measuring head 220 and the inclined surface at the bottom of the hole, and ensuring the stability of the measurement.

[0024] Furthermore, a limiting ring 600 is provided at the bottom end of the gauge body 100, and the limiting ring 600 is detachably connected to the bottom end of the receiving hole 102. For example, a insertion groove 106 is provided at the bottom end of the receiving hole 102. The limiting ring 600 includes an insertion part 610 and a bottom ring 620. The insertion part 610 is located at the top end of the bottom ring 620. A through hole 630 coaxially passes through the insertion part 610 and the bottom ring 620. The insertion part 610 is inserted into the insertion groove 106, and the outer side of the top end of the bottom ring 620 abuts against the outer side of the bottom end of the gauge body 100. The limiting ring 600 has an axially formed through hole 630. The rod part 210 is slidably connected in the through hole 630, and the measuring head 220 extends out of the through hole 630. The outer diameter of the shoulder 211 is larger than the inner diameter of the through hole 630. The shoulder 211 and the limiting ring 600 form a physical stop. When the measuring rod 200 is rebounded by the spring 400, the shoulder 211 hits the top surface of the limiting ring 600 and is forcibly braked to prevent the measuring head 220 from falling out of the fixture body 100.

[0025] In operation, this embodiment is as follows: First, assemble the upper block 510 and lower block 520 of the calibration block 500 by tightening screws to stabilize the zeroing reference hole 530. Then, insert the dial indicator 300 into the insertion hole 101 of the fixture body 100 and tighten the locking bolt of the gauge clamp 103 to secure the dial indicator 300. Next, hold the fixture body 100 and vertically press the measuring head 220 into the zeroing reference hole 530 of the calibration block 500, zeroing the dial of the dial indicator 300 to complete the reference calibration. Finally, vertically insert the fixture into the fuel injector. In the transverse hole 701, the large-diameter section 221 of the measuring head 220 automatically engages with the inner wall of the transverse hole 701 for positioning. At the same time, the bottom plane of the small-diameter section 222 forms a full-circle contact with the 2mm diameter position of the inclined surface at the bottom of the hole under the constant force of the spring 400. At this time, the hole depth deviation drives the measuring rod 200 to slide upward along the connecting hole 102, pushing the probe of the dial indicator 300 to move and displaying the reading on the dial. The inspector can directly read the reading of the dial indicator 300, which is the actual deviation of the depth of the transverse hole 701.

[0026] In this embodiment, the bottom surface of the small diameter section 222 is fitted with an outer ring at a point where the diameter of the bottom cross-section of the hole is equal to the diameter of the bottom surface of the small diameter section 222. This stabilizes the position of the measuring head 220 within the transverse hole 701 of the part being measured 700, preventing contact diameter drift caused by axial misalignment or surface morphology within the transverse hole 701, reducing measurement errors, and improving the production efficiency of the injector.

[0027] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A special gauge for measuring the depth of transverse holes in a fuel injector body, characterized in that, include: The fixture body has an insertion hole at its top and a connection hole at its bottom. The insertion hole and the connection hole are coaxial and connected. A measuring rod includes a rod section and a measuring head. The measuring head is located at the bottom end of the rod section. The measuring head includes a large-diameter section and a small-diameter section arranged coaxially. The small-diameter section is located at the bottom end of the large-diameter section. The bottom surface of the small-diameter section is a plane and perpendicular to the axis of the rod section. The rod section is slidably connected to a connecting hole. A dial indicator is installed in the socket, with the probe at the bottom of the dial indicator slidably connected to the socket and in contact with the top of the rod. A spring is sleeved on the outer side of the top end of the rod, with the upper and lower ends of the spring respectively abutting the top of the receiving hole and the outer side of the top end of the measuring head; The calibration block has a zero-calibration reference hole at the top.

2. The special gauge for measuring the depth of the transverse bore of the fuel injector body according to claim 1, characterized in that: A shoulder is provided on the outer side of the end of the rod near the dial indicator, and the lower end of the spring abuts against the shoulder.

3. The special gauge for measuring the depth of the transverse bore of the fuel injector body according to claim 1, characterized in that: The inner diameter of the connecting hole is smaller than the inner diameter of the insertion hole, and a stepped portion is formed at the connection between the connecting hole and the insertion hole, with the top end of the spring abutting against the stepped portion.

4. The special gauge for the transverse hole depth of the oil injector body as claimed in claim 2, characterized in that: The bottom end of the gauge body is also provided with a limiting ring. The limiting ring is detachably connected to the bottom end of the receiving hole. The limiting ring has an axially opened through hole. The rod is slidably connected in the through hole. The measuring head extends out of the through hole. The outer diameter of the shoulder is larger than the inner diameter of the through hole.

5. The special gauge for the transverse hole depth of the fuel injector body according to claim 4, characterized in that: The bottom end of the connection hole is provided with an insertion groove. The limiting ring includes an insertion part and a bottom ring. The insertion part is located at the top end of the bottom ring. The through hole coaxially passes through the insertion part and the bottom ring. The insertion part is inserted into the insertion groove. The outer side of the top end of the bottom ring abuts against the outer side of the bottom end of the inspection fixture body.

6. The injector body transverse hole depth special purpose gauge of claim 1, wherein: The top of the gauge body is provided with a dial clip and a locking bolt. The dial clip has an axially formed clamping groove, which is coaxial with the insertion hole. A locking hole is formed through the outer side of the dial clip, and the distance between the center line of the locking hole and the center line of the insertion hole is greater than the radius of the locking bolt. The locking bolt is installed in the locking hole to tighten the locking hole.

7. The special gage for the cross-hole depth of the fuel injector body according to claim 1, characterized in that: The calibration block includes an upper block and a lower block. The upper block is connected to the lower block by screws, and the zeroing reference hole is opened on the upper block.

8. The special gauge for the transverse hole depth of the oil injector body as claimed in claim 7, characterized in that: The upper block has several first screw holes on its outer side, and the lower block has several second screw holes on its outer side that are coaxial with and match the first screw holes. The upper block and the lower block are fixedly connected by the first screw holes, the second screw holes and screws.

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