A manual device for static balancing of a balance shaft

Abstract

This utility model discloses a manual static balance testing device for a balance shaft, including a base plate, a vertical plate on the base plate, a guide hole on the vertical plate, and a pin that reciprocates in coordination with the guide hole. The tip of the pin is provided with a needle rod with an adsorption function. The pin has an ink storage tank, one end of the needle rod extends into the ink storage tank, and the pin has an ink filling port communicating with the ink storage tank. This device significantly reduces the number of times the pin dips in ink by having an internal ink storage tank, thereby improving testing efficiency.

Description

Technical Field

[0001] This utility model relates to the field of static balance testing technology for balance shafts, and in particular to a manual static balance testing device for balance shafts. Background Technology

[0002] The balance shaft is a critical component of the engine, its function being to counteract harmful vibrations generated during engine operation. To ensure that every balance shaft leaving the factory meets stringent static balance standards, it is essential to perform precise static balance measurement (i.e., the mass-radius product of the center of mass).

[0003] A manual static balance testing device for a balance shaft is a standard device used to measure the static balance quantity. Its typical structure includes: a base plate, a pair of sliding plates slidably mounted on the base plate, a vertical plate fixed to the sliding plates, and rolling bearings mounted on the vertical plate. The standard testing procedure is as follows: Adjust the base plate to a horizontal position; place the outer diameter circles at both ends of the balance shaft onto the rolling bearings on the two vertical plates; apply force to allow the balance shaft to rotate freely on the bearings, and wait for it to stop naturally; use a needle dipped in a small amount of ink, pass it through the guide hole on the vertical plate, and mark the lowest point (center of gravity) of the balance shaft; remove the needle, and place a counterweight auxiliary device with weights onto the outer diameter circle of the balance shaft, adjust the auxiliary device so that its observation hole aligns with the marked center of gravity point, and tighten it; place the balance shaft with the auxiliary device installed back onto the rolling bearings, record the weight of the weights required to achieve equilibrium, and finally calculate the static balance quantity using the static balance calculation formula.

[0004] However, the inventors found that when using this conventional testing device, the amount of ink adhering to the tip of the needle after it is dipped in ink is limited and easily consumed. Usually, after a few uses, the ink on the tip of the needle is exhausted, making it impossible to clearly mark the center point. This causes the operator to frequently remove the needle for dipping. This repeated dipping and reinstallation of the needle significantly reduces the testing efficiency and increases the labor intensity of the operator. Utility Model Content

[0005] The purpose of this invention is to provide a manual static balance testing device for a balance shaft. This device significantly reduces the number of times the ejector pin dips in ink by using a built-in ink reservoir, thereby improving testing efficiency.

[0006] The above-mentioned technical objective of this utility model is achieved through the following technical solution:

[0007] A manual static balance testing device for a balance shaft includes a base plate, a vertical plate disposed on the base plate, a guide hole on the vertical plate, and a pin that reciprocates in coordination with the guide hole. The tip of the pin is provided with a needle rod with an adsorption function. The pin has an ink storage chamber, one end of the needle rod extends into the ink storage chamber, and the pin has an ink filling port communicating with the ink storage chamber.

[0008] By adopting the above technical solution, the needle bar continuously absorbs ink from the ink reservoir through capillary action, avoiding the traditional operation of repeatedly dipping the needle in ink; the ink filling port allows for direct ink replenishment without disassembling the needle.

[0009] The device is further configured such that: the tip of the ejector pin has a slide for mounting the needle rod, the ejector pin has a threaded hole that passes through the slide, and a fixing bolt that abuts against the needle rod is threaded into the threaded hole.

[0010] By adopting the above technical solution, bolt-fixed needle rods are easy to replace or maintain, ensuring a stable fit between the needle rod and the ink reservoir.

[0011] The ink reservoir is further configured such that the bottom surface of the ink reservoir is inclined downwards towards the needle bar, and the end of the needle bar extending into the ink reservoir is located at the lowest point of the ink reservoir.

[0012] By adopting the above technical solution, the inclined bottom surface uses gravity to make the ink gather at the needle bar adsorption end, ensuring continuous ink supply.

[0013] The ink filling port is further configured to have a backflow preventer, which is made of an elastic material and has an opening and closing opening.

[0014] By adopting the above technical solution, the anti-reverse component prevents ink leakage from the ink storage tank, and ink can be injected by squeezing the opening and closing port when adding ink.

[0015] Further configuration: the ink filling port is located at the top of the ejector pin, the top of the upright plate has a placement groove with a connecting guide hole, the placement groove is directly opposite the ink filling port, and the placement groove is equipped with an ink filler.

[0016] By adopting the above technical solution, operators can directly replenish ink to the ejector pin through the ink filler in the placement slot, completely eliminating the need for ejector pin disassembly.

[0017] The method is further configured such that: a limiting block is provided on the outer side of the ejector pin along its length direction, and a limiting groove is provided in the guide hole for the limiting block to slide.

[0018] By adopting the above technical solution, the limiting structure prevents the ejector pin from shifting circumferentially, ensuring the vertical movement accuracy of the ejector pin and keeping the ink filling port opening upward and connected to the placement slot.

[0019] The device is further configured such that: a pressing head is provided on the left side of the ejector pin, and a return spring is sleeved on the ejector pin, with the two ends of the return spring connected to the pressing head and the upright plate, respectively.

[0020] By adopting the above technical solution, the spring automatically resets the ejector pin after pressing, improving the continuity of operation. Attached Figure Description

[0021] Figure 1This is a schematic diagram of the overall structure of this embodiment;

[0022] Figure 2 This is a cross-sectional view of the ejector pin, ink dispenser, and vertical plate in this embodiment;

[0023] Figure 3 This is an exploded view of the area between the ejector pin, ink dispenser, and vertical plate in this embodiment;

[0024] Figure 4 This is an enlarged view of the area between the ejector pin and the guide hole in this embodiment;

[0025] Figure 5 This is an example. Figure 2 Enlarged view at point A in the middle;

[0026] Figure 6 This is an example. Figure 2 Enlarged view at point B;

[0027] In the diagram: 1. Base plate; 11. Vertical plate; 12. Guide hole; 13. Ejector pin; 14. Needle bar; 15. Ink reservoir; 16. Ink filling port; 21. Slide rail; 22. Threaded hole; 23. Fixing bolt; 41. Anti-reverse component; 42. Opening / closing port; 51. Placement slot; 52. Ink filler; 61. Limiting block; 62. Limiting groove; 71. Pressing head; 72. Return spring; Detailed Implementation

[0028] To explain in detail the technical content, structural features, objectives and effects of this utility model, the following description is provided in conjunction with the embodiments and accompanying drawings.

[0029] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model. In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0030] refer to Figures 1 to 6A manual static balance testing device for a balance shaft includes a base plate 1 and a pair of upright plates 11 vertically fixed on the base plate 1. One of the upright plates 11 has a cylindrical guide hole 12 in its center, and a pin 13 reciprocates axially in conjunction with the guide hole 12. A needle rod 14 (preferably made of wool felt) is embedded at the tip of the pin 13. The pin 13 is cylindrical, and a rectangular ink reservoir 15 is formed inside it. The left end of the needle rod 14 extends to the bottom of the ink reservoir 15, and the right end is exposed outside the pin 13. An ink filling port 16 is formed at the top of the pin 13, connecting to the ink reservoir 15. Figure 2 ).

[0031] The tip of the ejector pin 13 is machined into a circular slide 21, and the needle bar 14 is embedded in the slide 21. A threaded hole 22 is formed in the top wall of the ejector pin 13, which penetrates the slide 21. A fixing bolt 23 is screwed into the threaded hole 22 and abuts against the needle bar 14. Figure 5 The ink reservoir 15 is tilted at a 15° angle towards the needle bar 14, with the extended end of the needle bar 14 located at the lowest point of the tilted surface, ensuring that the ink converges at the adsorption end. Figure 2 The ink filling port 16 has an embedded silicone anti-reverse component 41, with an O-shaped opening 42 at its center. Under normal conditions, the opening 42 is closed; during ink filling, the syringe squeezes the opening 42 to expand and inject ink. Figure 6 ).

[0032] A circular slot 51 is formed at the top of the upright plate 11, connecting to the guide hole 12. An ink dispenser 52 (syringe type) is fixed inside the slot. When the ejector pin 13 resets, the outlet of the ink dispenser 52 is precisely aligned with the ink filling port 16. Figure 2 The outer wall of the ejector pin 13 is integrally formed with a long strip-shaped limiting block 61, and a matching limiting groove 62 is opened on the inner wall of the guide hole 12 to constrain the circumferential rotation of the ejector pin 13. Figure 4 The left end of the ejector pin 13 is fixedly connected to the pressing head 71, and the return spring 72 is sleeved on the ejector pin 13, with its two ends respectively abutting the right side of the pressing head 71 and the left side of the upright plate 11. Figure 2 ).

[0033] Overall workflow: ① Press the pressing head 71 to the right to push the ejector pin 13 to the right, and the needle bar 14 contacts the lowest point of the balance shaft, marking the center of gravity; ② Release the pressing head 71, and the return spring 72 automatically pulls the ejector pin 13 back to the left; ③ When ink needs to be replenished, insert the ink filler 52 vertically into the placement slot 51, press down to fill the ink, and the ink is injected into the ink storage tank 15 through the ink filling port 16; ④ The ink flows along the inclined bottom of the tank to the needle bar 14, and is continuously replenished to the needle tip of the needle bar 14 by capillary action. The ejector pin 13 does not need to be disassembled throughout the entire process.

[0034] This specific embodiment is merely an explanation of the present utility model and is not intended to limit the present utility model. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but as long as they are within the scope of the claims of the present utility model, they are protected by patent law.

Claims

1. A manual static balance testing device for a balance shaft, comprising a base plate (1), a vertical plate (11) disposed on the base plate (1), a guide hole (12) provided on the vertical plate (11), and a pin (13) reciprocating in coordination with the guide hole (12), characterized in that: The tip of the ejector pin (13) is provided with a needle bar (14) with an adsorption function. The ejector pin (13) has an ink storage chamber (15). One end of the needle bar (14) extends into the ink storage chamber (15). The ejector pin (13) has an ink filling port (16) that connects to the ink storage chamber (15).

2. A manual balancing shaft counterbalance detection device according to claim 1, wherein: The tip of the ejector pin (13) is provided with a slide (21) for mounting the needle bar (14). The ejector pin (13) is provided with a threaded hole (22) that passes through the slide (21). A fixing bolt (23) that abuts against the needle bar (14) is threaded into the threaded hole (22).

3. A manual balancing shaft counterbalance detection device according to claim 1, wherein: The bottom surface of the ink reservoir (15) is inclined downward toward the needle bar (14), and the end of the needle bar (14) extending into the ink reservoir (15) is located at the lowest point of the ink reservoir (15).

4. The apparatus for manual detection of static balance of a balancing shaft according to claim 1, characterized in that: An anti-reverse component (41) is provided at the ink filling port (16). The anti-reverse component (41) is made of elastic material and has an opening (42).

5. A manual balancing shaft counterbalance detection device according to claim 1, wherein: The ink filling port (16) is located on the top of the ejector pin (13). The top of the upright plate (11) is provided with a placement groove (51) that connects to the guide hole (12). The placement groove (51) is directly opposite the ink filling port (16). The placement groove (51) is provided with an ink filler (52).

6. A manual balancing shaft counterbalance detection device according to claim 1, wherein: The outer side of the ejector pin (13) is provided with a limiting block (61) along its length direction, and a limiting groove (62) is provided in the guide hole (12) for the limiting block (61) to slide.

7. A manual balancing shaft counterbalance detection device according to claim 1, wherein: The ejector pin (13) has a pressing head (71) on its left side, and a return spring (72) is sleeved on the ejector pin (13). The two ends of the return spring (72) are respectively connected to the pressing head (71) and the upright plate (11).

Images