A quick adjustment structure for the connecting rod bearing shell clearance
By leaving a gap between the connecting rod body and the connecting rod cap and using an adjustable shim with adjustable thickness, the problem of skill dependence in the installation and adjustment of the connecting rod bearing was solved, enabling fast and accurate bearing adjustment, improving equipment maintenance efficiency and reducing maintenance costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZHEJIANG QIANGSHENG COMPRESSOR MFG
- Filing Date
- 2025-07-17
- Publication Date
- 2026-07-24
AI Technical Summary
In the existing technology, the installation and adjustment of connecting rod bearings rely on fitter skills, and it is difficult to adjust the bearing clearance and cylindricity when there is a lack of machining equipment at the user's site, which affects the normal operation of the equipment.
A quick adjustment structure for connecting rod bearing clearance was designed. By leaving a gap between the connecting rod body and the connecting rod cap, and using an adjustable thickness adjustment pad, combined with a U-shaped structure and screw connection, the bearing can be quickly adjusted.
It simplifies the bearing replacement process, reduces reliance on fitter skills, avoids factory repairs, improves maintenance efficiency, reduces maintenance costs, and ensures dimensional accuracy.
Smart Images
Figure CN224550620U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to an improved invention of a reciprocating compressor, and more particularly to an improved invention of a quick adjustment structure for the connecting rod bearing clearance. Background Technology
[0002] In reciprocating compressors, the connecting rod, as an important component of the crank-connecting rod mechanism, is a mechanism that transmits the thrust acting on the piston to the crankshaft and converts the rotational motion of the crankshaft into the reciprocating motion of the piston. The big end of the connecting rod typically consists of the connecting rod body, connecting rod cap, bearing shell, connecting rod bolt, connecting rod nut, cotter pin, etc.
[0003] To ensure the dimensional tolerances (clearance) and positional tolerances (cylindricity) of the bearing bush after installation, there are usually two common methods: one is to repeatedly scrape the inner hole surface until the requirements are met after the bearing bush is installed and the connecting rod bolts are tightened; the other method is that the manufacturer will machine the inner hole of the bearing bush after the bearing bush is installed and the connecting rod bolts are tightened to ensure the clearance and cylindricity of the inner hole of the bearing bush.
[0004] However, traditional internal bore scraping methods require a high level of skill from the fitter, and not everyone is capable of replacing bearing bushes. Furthermore, if the scraped metal shavings are not thoroughly cleaned, they can easily cause secondary damage to the friction parts. This method is highly dependent on human factors and may disrupt normal production. While traditional internal bore machining methods are easily performed at the factory, they become impossible to perform at the user's site if the appropriate machining equipment is unavailable. The equipment must be returned to the factory for repair, a lengthy process that disrupts normal equipment operation. Utility Model Content
[0005] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a quick adjustment structure for the clearance of connecting rod bearings.
[0006] To solve the above-mentioned technical problems, this utility model adopts the following technical solution: A quick adjustment structure for the clearance of a connecting rod bearing includes a connecting rod body, a connecting rod cover, a connecting rod nut, a connecting rod bolt, and bearings. The connecting rod body and the connecting rod cover are connected abuttingly, and the corresponding sides of the connecting rod body and the connecting rod cover are respectively fixedly connected by connecting rod bolts and connecting rod nuts. The bearings are installed between the connecting rod body and the connecting rod cover, and the bearings include mating upper and lower bearings. The characteristic feature is that a gap is reserved between the connecting rod body and the connecting rod cover, and an adjusting shim is provided within the gap. The adjusting shims have different thicknesses for selection and combination. The connecting rod bolt passes through the adjusting shims, and the adjusting shims are respectively connected to the ports of the upper and lower bearings.
[0007] The adjusting pad is U-shaped, and the corresponding adjusting pad has an opening in the middle for the connecting rod bolt to pass through. The two legs of the adjusting pad are respectively provided with connecting holes, which are connected to the upper and lower plates by screws. The corresponding upper and lower plates are provided with screw holes and clearance grooves.
[0008] The reserved gap between the connecting rod body and the connecting rod cover is 5mm, and the thickness of the adjusting shims is 4.7±0.02mm, 0.2±0.02mm, 0.15±0.02mm, 0.1±0.02mm, and 0.05±0.02mm, with two pieces of each.
[0009] The connecting rod bolt is connected to the connecting rod nut, and one end is equipped with a cotter pin.
[0010] The beneficial effect of this utility model is that the improved connecting rod bearing clearance quick adjustment structure allows for easy replacement of the bearing in the later stages. By simply adjusting the thickness of the shim, the clearance value and cylindricity of the inner hole can be controlled. This not only avoids the dependence on the skill level of fitters for manual scraping, but also avoids the need for the entire assembly to be returned to the factory due to the lack of corresponding machining facilities on-site. This improves maintenance efficiency, reduces maintenance costs, and ensures dimensional accuracy. Attached Figure Description
[0011] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings.
[0012] Figure 1 This is a schematic diagram of the structure of this utility model.
[0013] Figure 2 This utility model Figure 1 Enlarged view of part A.
[0014] Figure 3 This is a structural diagram of the adjusting pad of this utility model. Detailed Implementation
[0015] The accompanying drawings illustrate the structure of this utility model, and further details will be described below with reference to the drawings. In this embodiment, the components included in the drawings... Figure 1-3The quick-adjustment structure for the clearance of the connecting rod bearing 5 includes a connecting rod body 1, a connecting rod cover 2, a connecting rod nut 3, a connecting rod bolt 4, and a bearing 5. The connecting rod body 1 and the connecting rod cover 2 are connected to each other. The corresponding sides of the connecting rod body 1 and the connecting rod cover 2 are fixedly connected by the connecting rod bolt 4 and the connecting rod nut 3, respectively. Specifically, the connecting rod body 1 and the connecting cover are provided with mating holes for the connecting rod bolt 4 to pass through. The bearing 5 is installed between the connecting rod body 1 and the connecting rod cover 2, and the bearing 5 includes a mating upper bearing 51 and a lower bearing 52. A gap is reserved between the connecting rod body 1 and the connecting rod cover 2, and an adjusting shim 6 is provided in the gap. The adjusting shim 6 has different thicknesses for selection and combination. The connecting rod bolt 4 passes through the adjusting shim 6, and the adjusting shim 6 is connected to the port of the upper bearing 51 and the lower bearing 52, respectively, to position the bearing 5, prevent the bearing 5 from rotating in the big end of the connecting rod, and reduce the machining of the traditional bearing 5 positioning lip. When replacing the bearing 5 later, it is only necessary to adjust the total thickness of the shim 6 to control the clearance value and cylindricity of the inner hole.
[0016] As a further improvement, a 5mm gap is reserved between the connecting rod body 1 and the connecting rod cap 2. Adjusting shims 6 are added to ensure the gap value and cylindricity of the inner hole are fully guaranteed during initial installation. Two adjusting shims 6 are provided, each with a thickness of 4.7±0.02mm, 0.2±0.02mm, 0.15±0.02mm, 0.1±0.02mm, and 0.05±0.02mm, to fill the 5mm gap at both the top and bottom.
[0017] As a further improved specific implementation, the adjusting pad 6 is U-shaped, and the corresponding adjusting pad 6 has an opening 61 in the middle for the connecting rod bolt 4 to pass through. The two legs of the adjusting pad 6 are respectively provided with connecting holes 62, which are connected to the upper plate 51 and the lower plate 52 by screws 7. The corresponding upper plate 51 and lower plate 52 are provided with screw holes and clearance grooves 9. The clearance grooves are located at the positions corresponding to the screw heads, which facilitates screw tightening.
[0018] As a further improvement, the connecting rod bolt 4 is equipped with a cotter pin 8 at one end connected to the connecting rod nut 3. The corresponding connecting rod nut 3 is a slotted nut, and the corresponding connecting rod bolt 4 is provided with a pin hole for the cotter pin 8 to pass through for fixing, thereby further improving the connection stability.
[0019] In summary, the above are merely preferred embodiments of this utility model and are not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.
Claims
1. A quick-adjustment structure for connecting rod bearing clearance, comprising a connecting rod body, a connecting rod cap, a connecting rod nut, a connecting rod bolt, and a bearing, wherein the connecting rod body and the connecting rod cap are butt-connected, and corresponding sides of the connecting rod body and the connecting rod cap are respectively fixedly connected by connecting rod bolts and connecting rod nuts, and the bearing is installed between the connecting rod body and the connecting rod cap, and the bearing includes a mating upper bearing and a lower bearing, characterized in that: A gap is reserved between the connecting rod body and the connecting rod cover, and an adjusting shim is provided in the gap. The adjusting shim has different thicknesses for selection and combination. The connecting rod bolt passes through the adjusting shim, and the adjusting shim is connected to the upper and lower cover ports respectively.
2. The quick adjustment structure for connecting rod bearing clearance as described in claim 1, characterized in that: The adjusting pad is U-shaped, and the corresponding adjusting pad has an opening in the middle for the connecting rod bolt to pass through. The two legs of the adjusting pad are respectively provided with connecting holes, which are connected to the upper and lower plates by screws. The corresponding upper and lower plates are provided with screw holes and clearance grooves.
3. The quick adjustment structure for connecting rod bearing clearance as described in claim 1, characterized in that: The reserved gap between the connecting rod body and the connecting rod cover is 5mm, and the thickness of the adjusting shims is 4.7±0.02mm, 0.2±0.02mm, 0.15±0.02mm, 0.1±0.02mm, and 0.05±0.02mm, with two pieces of each.
4. The quick adjustment structure for connecting rod bearing clearance as described in claim 1, characterized in that: The connecting rod bolt is connected to the connecting rod nut, and one end is equipped with a cotter pin.