An air suction cover integrated tool

Abstract

The utility model discloses an integrated tool of air suction cover relates to tool fixing technical field, including bottom plate, is equipped with a plurality of positioning hole groups on the bottom plate, and the corresponding positioning block group is installed on the positioning hole group, and the positioning block group sets up below the air suction cover, and the positioning block is connected through connecting rod and pressing plate, and the pressing plate one end sets up above the air suction cover, and the outer end of positioning block and pressing plate is connected with the top rod, the utility model discloses is suitable for all kinds of air suction cover, has reduced the design various tool costs, has reduced the tool time of replacing, has improved the clamping efficiency.

Description

Technical Field

[0001] This utility model relates to the field of tooling fixing technology, and in particular to an integrated tooling for an air intake cover. Background Technology

[0002] Currently, there are various models of air intake covers on the market, mainly differing in the total length and diameter of the workpiece. Each type of air intake cover requires a separate dedicated tooling, which not only significantly increases design costs but also causes substantial production losses. Moreover, each time the air intake cover model is changed, the corresponding tooling needs to be replaced, a process that not only wastes a lot of time but also significantly reduces processing efficiency and increases production costs.

[0003] Chinese Patent Publication No. CN222711992U, Publication Date: April 4, 2025, discloses a Chinese patent entitled "A Shell Bonding Fixture and Positioning Fixture," which includes a support plate. A positioning frame is fixedly connected to the top of the support plate, and a product shell is fixedly connected to the top of the support plate. An inner lining is fixedly connected to the inner wall of the product shell. Multiple positioning blocks are fixedly connected to the top of the support plate, and multiple quick clamps are fixedly connected to the top of each positioning block. An abutment block is fixedly connected to one side of each quick clamp, and a limit block is slidably connected to one side of each positioning block. A spring plunger is fixedly connected to the inner wall of the limit block. Support components for supporting devices are fixedly connected to the four corners of the bottom of the support plate. This positioning fixture only has one set of positioning blocks and quick clamps, and can only be used for clamping and positioning one type of air intake cover, resulting in poor versatility and increased production costs. Utility Model Content

[0004] This utility model provides an integrated tooling for air intake caps, which is applicable to all types of air intake caps by setting several positioning hole groups and positioning block groups; it reduces costs, reduces tooling change time, and improves efficiency.

[0005] A further objective of this invention is to enable the intake cover to be finely adjusted during installation by setting a slotted hole, thereby ensuring the accuracy of its position and improving processing precision and quality.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: an integrated tooling for an air intake cover, including a base plate, a plurality of positioning hole groups on the base plate, corresponding positioning block groups installed on the positioning hole groups, the positioning block groups being disposed below the air intake cover, the positioning blocks being connected to a pressure plate via connecting rods; one end of the pressure plate being disposed above the air intake cover, the outer ends of the positioning blocks and the pressure plate being connected to a top rod, and a side top support member being disposed on the base plate, the side top support member including one end of a side top rod abutting against the side of the air intake cover.

[0007] Preferably, the positioning hole group includes several positioning holes distributed circumferentially along the center of the base plate. The base plate is a circular plate, fixed to several bases, which are evenly distributed circumferentially on the lower surface of the base plate near its sides. The bases are rectangular blocks. This design allows the tooling to adapt to suction covers of different sizes. By selecting positioning holes at different positions, different models of suction covers can be flexibly fixed, greatly improving the versatility and flexibility of the tooling and reducing downtime caused by tooling changes.

[0008] Preferably, different sets of positioning holes have different positions and diameters on the base plate. This is to accommodate different types of air intake covers. By designing positioning hole sets with different positions and diameters, the tooling can accurately fit air intake covers of various sizes and shapes, further enhancing the tooling's versatility and adaptability, and reducing production delays caused by tooling mismatch.

[0009] Preferably, the positioning block assembly includes several positioning blocks distributed circumferentially along the center of the base plate. The design of the positioning block assembly ensures that the suction cover can be stably fixed to the tooling, preventing displacement of the suction cover during processing and improving machining accuracy and quality.

[0010] Preferably, the positioning block has several first mounting holes, through which it is fixed to the base plate. Bolts pass through the first mounting holes and the positioning holes to fix the positioning block in the corresponding position on the base plate. This fixing method is simple and reliable, facilitates installation and disassembly, and ensures the stability of the positioning block, further improving the stability and reliability of the tooling.

[0011] Preferably, the pressure plate has a second mounting hole, which is a slotted hole. The pressure plate and the positioning block are arranged parallel to each other. A nut is connected to the connecting rod above the second mounting hole on the pressure plate to fix the pressure plate. The slotted design of the second mounting hole provides adjustment space for the suction cover, allowing the connecting rod to move along the length of the hole within the second mounting hole. The slotted design provides adjustment space for the suction cover, allowing for fine-tuning during installation to ensure its positional accuracy, thereby improving processing precision and quality.

[0012] Preferably, the connecting rod passes through the second mounting hole to fix the pressure plate and the positioning hole. A nut is provided on the connecting rod above the positioning block, and a top rod is connected to the end of the pressure plate and positioning block away from the suction cover. This fixing method further enhances the connection stability of the pressure plate and positioning block, ensuring that the suction cover will not loosen during processing, thus improving the reliability and safety of the processing.

[0013] Preferably, the width of the end of the pressure plate that contacts the air intake cap is smaller than the width of the other end of the pressure plate. That is, the end of the pressure plate that contacts the air intake cap is narrower, and its width is smaller than other parts of the pressure plate. This design allows the pressure plate to better conform to the shape of the air intake cap, improves the fixing effect of the pressure plate on the air intake cap, reduces wear on the air intake cap by the pressure plate, and extends the service life of the air intake cap.

[0014] Preferably, the side top support includes a side top seat, which is fixed to the base plate. The side top seat is inverted T-shaped and fixed to the base plate by bolts and nuts. An adjustment hole is provided at the top of the side top seat. The design of the side top support provides additional support for the air intake cover and allows adjustment of the air intake cover's installation position, further enhancing the stability of the air intake cover during processing and reducing processing errors caused by air intake cover shaking.

[0015] Preferably, the side push rod passes through the side top seat and abuts against the side of the air intake cover. The diameter of the side push rod is smaller on the side of the side top seat closer to the air intake cover, and larger on the other side of the side top seat, which serves as a limit to prevent over-adjustment of the side push rod. This design not only ensures that the side push rod can flexibly adjust the position of the air intake cover, but also prevents over-adjustment of the side push rod through the limit design, further improving the stability and reliability of the tooling.

[0016] The advantages of this utility model are: This utility model provides an integrated tooling for air intake covers, which is applicable to all types of air intake covers by setting several positioning hole groups and positioning block groups; it reduces the cost of designing various toolings, reduces the time for changing toolings, and improves clamping efficiency. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model.

[0018] Figure 2 for Figure 1 Enlarged view of point A.

[0019] Figure 3 for Figure 1 Enlarged view at point B.

[0020] Figure 4 This is a schematic diagram of the structure of the base plate of this utility model.

[0021] Reference numerals in the attached drawings: 1: Suction cover; 2: Base plate; 2.1: Positioning hole; 3: Base; 4: Positioning block; 4.1: First mounting hole; 5: Connecting rod; 6: Second mounting hole; 7: Top rod; 8: Side top support; 8.1: Side top seat; 8.2: Side top rod; 8.3: Adjustment hole; 9: Pressure plate. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments 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 protection scope of this utility model.

[0023] In modern manufacturing, the air intake cover 1 is a key component of various equipment, and its processing precision and production efficiency directly affect the performance and cost of the final product. Traditional tooling often suffers from limited model variety and poor adaptability, leading to frequent tooling changes for enterprises, which not only increases equipment downtime but also wastes resources. This utility model's integrated tooling for the air intake cover 1, through an innovative positioning structure design, achieves compatibility and adaptability with the entire series of air intake covers 1, significantly improving production flexibility and efficiency, and providing a breakthrough solution for cost reduction and efficiency improvement in the manufacturing industry.

[0024] like Figure 1 As shown, this fixture uses a circular base plate 2 as its core carrier. The base plate 2 is preferably made of high-strength aluminum alloy (such as 6061-T6), which is lightweight and has high rigidity. Several rectangular bases 3 are fixed to the lower surface of the base plate 2 with bolts. The bases 3 are evenly distributed on the edge of the base plate 2 to form a stable support structure. In this embodiment, four bases 3 are preferably set to ensure that the fixture will not shake due to uneven force during processing.

[0025] like Figure 1 and Figure 4 As shown, the upper surface of the base plate 2 is provided with several sets of positioning holes 2.1. Each set of positioning holes 2.1 contains several positioning holes 2.1 distributed circumferentially along the center. The positions and diameters of different sets of positioning holes 2.1 are different. For example, the positioning holes 2.1 set for small air intake covers 1 are close to the center of the base plate 2, and the hole spacing is relatively dense; the positioning holes 2.1 set for large air intake covers 1 are distributed at the edge of the base plate 2, and the hole spacing is increased. This concentric radial layout is like pre-setting a dedicated position for air intake covers 1 of different sizes. By selecting the corresponding positioning hole 2.1 set, multiple product models can be quickly adapted, avoiding the limitation of traditional tooling being "one machine, one use".

[0026] like Figure 1 and 2As shown, the positioning blocks 3 correspond one-to-one with the positioning holes 2.1. Each group of positioning blocks 3 includes multiple positioning blocks 3 distributed circumferentially along the center of the base plate 2. The positioning blocks 3 are preferably made of wear-resistant engineering plastic (such as POM) or aluminum alloy. The positioning blocks 3 are rectangular blocks, with one end in contact with the bottom surface of the air intake cover 1 to improve the fixing stability. The positioning blocks 3 are connected to the base plate 2 through the first mounting hole 4.1. After the bolt passes through the mounting hole and the positioning hole 2.1, it is tightened to form a detachable rigid connection.

[0027] In the consumer electronics sector, air intake covers (1) often require small-batch customization due to frequent product iterations. The rapid changeover capability of this tooling makes it an ideal choice for customized production: when a new air intake cover (1) needs to be manufactured, operators only need to select the corresponding positioning holes (2.1 sets) and positioning blocks (3) according to the drawings, and adjust the height of the pressure plate (9) to quickly complete the tooling adaptation. After adopting this tooling, a smart device manufacturer shortened the prototyping cycle for new products from 7 days to 2 days, significantly improving market responsiveness and winning more customer orders.

[0028] like Figure 1 and Figure 2 As shown, the positioning block 3 is connected to the pressure plate 9 via a connecting rod 5. The pressure plate 9 is a rectangular block, with one end positioned above the suction cover 1 and in contact with the upper surface of the suction cover 1, and the other end screwed to the top rod 7. This double fixing structure of "supporting from below and pressing from above" creates a three-dimensional clamping space for the suction cover 1: the positioning block 3 supports the bottom of the suction cover 1 from below, and the pressure plate 9 presses the edge from above. Together with the side top support 8, it forms a three-dimensional stable clamping structure with a certain adjustment space, ensuring that the suction cover 1 remains stationary during milling, drilling, and other processing, significantly improving processing accuracy.

[0029] like Figure 3 As shown, the side top support 8 includes a telescopic side top rod 8.2, one end of which is driven by hand, and the other end is designed as an abutment surface that fits against the side of the air intake cover 1. After the pressure plate 9 is manually screwed on, the workpiece position needs to be adjusted to ensure that the workpiece is accurately positioned on the positioning block 3. The side top support 8 is used to adjust the workpiece position to compensate for the gap caused by the size difference of different product models.

[0030] The positioning block 3 is connected to the base plate 2 by bolts. Disassembly simply requires unscrewing the bolts to remove the positioning block 3 from the positioning hole 2.1. Installation involves selecting the corresponding group of positioning holes 2.1 according to the model of the suction cover 1, inserting the positioning block 3, and tightening the bolts. The entire process can be completed within 5 minutes. Compared to the cumbersome process of traditional tooling requiring complete disassembly and replacement, this design reduces changeover time by more than 80%, greatly improving the production line's response speed.

[0031] The main body of the tooling adopts a modular design, and each component can be disassembled and replaced individually. Visible parts such as positioning blocks 3 and pressure plates 9 use standardized specifications, resulting in low inventory management costs and a simple structure with low production costs. Compared to the traditional, complex tooling's overall maintenance model, this design reduces maintenance workload and saves maintenance costs. Furthermore, the aluminum alloy base plate 2 undergoes hard anodizing treatment, providing strong corrosion resistance and a service life of over 5 years, further reducing long-term operating costs.

[0032] The connecting rod 5 and the pressure plate 9 are connected by a threaded adjustment structure. By adjusting the connecting rod 5, the height and angle of the pressure plate 9 can be adjusted to accommodate the top structure of the suction cover 1 with different thicknesses or tilt angles. This "one-piece, multi-adjustment" design avoids interference problems of the pressure plate 9 caused by product differences and further enhances the versatility of the tooling.

[0033] Traditionally, producing 10 different types of air intake covers requires 10 sets of dedicated tooling. This integrated tooling, however, uses a combination of 2.1 sets of positioning holes and 3 sets of positioning blocks, requiring only one set to cover the entire product line. For example, a home appliance company previously had to frequently change tooling when producing different models of air intake covers, resulting in significant annual production capacity losses due to downtime for model changes. After adopting this tooling, there is no need to purchase additional dedicated tooling, reducing equipment investment costs while simultaneously improving capacity utilization and significantly increasing production efficiency.

[0034] like Figure 2 As shown, the second mounting hole 6 on the pressure plate 9 adopts a slotted hole design, and its length direction is consistent with the clamping direction of the suction cover 1. The width of the slotted hole is adapted to the diameter of the connecting rod 5, and the length is reasonably set according to the size differences of common suction covers 1, providing adjustable space for the connecting rod 5. When installing different models of suction covers 1, the operator can operate the side top support 8 to slide along the slotted hole of the connecting rod 5 and fine-tune the installation position of the suction cover 1, so that the fit between the pressure plate 9 and the top of the suction cover 1 is optimal. This avoids the problem of incomplete clamping caused by the size deviation of the suction cover 1. For example, when machining two suction covers 1 with slightly different top contours, there is no need to replace the pressure plate 9. Simply operate the side top support 8 to quickly complete the adaptation, ensuring that the pressure plate 9 always fixes the workpiece with the best pressure, improving clamping efficiency and machining accuracy.

[0035] like Figure 2As shown, after the connecting rod 5 passes through the second mounting hole 6, nuts are respectively installed above the pressure plate 9 and below the positioning block 3, forming a double-fixed structure of "upper and lower clamping". The upper nut is used to adjust the height and position of the pressure plate 9, while the lower nut firmly connects the positioning block 3 to the base plate 2. This design is like adding "double insurance" between the positioning block 3 and the pressure plate 9: upper layer adjustment: by rotating the upper nut, the clamping force of the pressure plate 9 on the suction cover 1 can be precisely controlled, avoiding workpiece deformation due to excessive pressure or shaking during processing due to insufficient pressure; lower layer fixing: the lower nut locks the positioning block 3 tightly into the positioning hole 2.1 of the base plate 2, ensuring that the entire positioning block 3 group will not loosen due to vibration during processing, which is especially suitable for high-speed cutting or heavy-duty processing scenarios. The application of the double nut structure significantly improves the connection strength between the pressure plate 9 and the positioning block 3. Combined with the lateral clamping of the side top support 8, a stable clamping system is formed in all directions, effectively reducing the risk of positional displacement during processing.

[0036] like Figure 2 As shown, the end of the pressure plate 9 that contacts the air intake cover 1 has a narrower width design, meaning that the width of this end is smaller than that of the main body of the pressure plate 9. This "narrow in the front and wide in the back" profile design is inspired by the self-adaptive principle of mechanical clamps: the narrower contact end can penetrate deep into the grooves or gaps on the edge of the air intake cover 1, closely fitting its irregular profile, while the wider main body provides sufficient structural strength to ensure that the pressure plate 9 will not bend or deform when pressed.

[0037] In actual processing, this design demonstrates significant advantages: for air intake covers 1 with flanged or curved edges, the narrowed end of the pressure plate 9 can precisely embed under the flange, forming a hook-like clamping effect, avoiding the problem of insufficient local pressure caused by the excessively large contact area of ​​traditional flat pressure plates 9. Simultaneously, the narrower contact area reduces the friction zone between the pressure plate 9 and the air intake cover 1, reducing workpiece surface wear caused by repeated clamping. This is particularly suitable for air intake cover 1 products with high surface treatment requirements, extending the service life of the workpiece.

[0038] The end of the pressure plate 9 and the positioning block 3 furthest from the air intake cover 1 is connected by a push rod 7. The push rod 7 adopts a threaded rod or metal connecting rod structure, and its two ends are hinged or screwed to the pressure plate 9 and the positioning block 3 respectively. This design is like building a "stable bridge" between the pressure plate 9 and the positioning block 3, so as to evenly transmit the force between the two and avoid the pressure plate 9 tilting or the positioning block 3 shifting due to unilateral pressing.

[0039] During machining, the push rod 7 and the double nut fixing structure work together to form a stable framework, effectively suppressing the torsional torque of the pressure plate 9. Even when facing the transverse cutting force during milling, the entire clamping system can maintain rigidity, ensuring the positional accuracy of the air intake cover 1 and reducing machining errors caused by tooling vibration.

[0040] like Figure 3 As shown, the side top support 8.1 of the side top support 8 adopts an inverted T-shaped structure. The wide bottom surface is fixed to the base plate 2 by bolts and nuts, and the narrow top end is provided with an adjustment hole 8.3. The advantages of the inverted T-shaped design are: stable installation: the wide bottom has a large contact area with the base plate 2, and the bolts are not easy to loosen after fixing, which can withstand the lateral thrust applied by the side top rod 8.2; convenient adjustment: the position of the top adjustment hole 8.3 is higher than the side of the air intake cover 1, which makes it easy for the operator to quickly insert the side top rod 8.2 from above and make adjustments, saving clamping time.

[0041] The side top support 8.1 is fixed to a preset position on the base plate 2 by bolts, allowing the suction cover 1 to move along the plane of the base plate 2 for fine-tuning and improving machining accuracy. This "adjustable position + stable structure" design makes the side top support 8 an important auxiliary structure for tooling to adapt to different types of workpieces.

[0042] The side push rod 8.2 adopts a stepped diameter design. The diameter on the side closer to the suction cover 1 is smaller, making it easier to insert into the adjustment hole 8.3 of the side top seat 8.1 and fit against the side of the workpiece. The diameter on the side farther from the suction cover 1 is larger, forming a limiting boss to prevent the side push rod 8.2 from falling out of the adjustment hole 8.3 or from being over-adjusted. The operator can adjust the tightness between the side push rod 8.2 and the suction cover 1 by rotating the side push rod 8.2 or pushing it axially, while the limiting boss ensures that the side push rod 8.2 is always within the safe adjustment range. This design ensures the flexibility of the side push rod 8.2 while avoiding workpiece damage or tooling failure due to over-adjustment through physical limiting.

[0043] Clamping operation procedure.

[0044] 1. Install positioning blocks 3: First, according to the drawing number and category of the suction cover 1 to be processed, carefully check the position of the positioning holes 2.1 on the base plate 2, and install the four positioning blocks 3 on the base plate 2 at the corresponding positions of the positioning holes 2.1. During installation, ensure that the installation direction and position of the positioning blocks 3 are accurate to ensure that the subsequent workpiece can be stably placed on the positioning blocks 3. After installation, check whether the positioning blocks 3 are firm to ensure that they will not loosen during processing.

[0045] 2. Place the workpiece on the positioning block 3: Use appropriate lifting tools, such as hooks or slings, to steadily lift the suction cover 1. During the lifting process, pay attention to maintaining the balance of the suction cover 1 to avoid collisions or damage. Slowly place the suction cover 1 onto the fixed positioning block 3, ensuring that the bottom of the suction cover 1 is tightly fitted with the positioning block 3. After placement, check whether the suction cover 1 is correctly placed on the positioning block 3. If there is any deviation, adjust it promptly.

[0046] 3. Upper Pressure Plate 9: After placing the workpiece on the positioning block 3 and confirming that the position is correct, place the pressure plate 9 on top of the workpiece, aligning the pressing part of the pressure plate 9 with the workpiece. Then, connect the pressure plate 9 to the positioning block 3 via the connecting rod 5, ensuring a secure connection. During the connection process, pay attention to the installation direction and position of the pressure plate 9 to ensure that it can evenly press the workpiece, avoiding uneven force on the workpiece due to improper installation of the pressure plate 9.

[0047] 4. Side Top Positioning: After manually tightening the pressure plate 9, the position of the workpiece needs further adjustment to ensure that the workpiece is accurately positioned on the positioning block 3. At this time, the side top support 8 is used to fine-tune the position of the workpiece. By abutting the side top rod 8.2 of the side top support 8 against the side of the workpiece, gently push the workpiece to achieve the optimal position on the positioning block 3. During the adjustment process, carefully observe the positional changes of the workpiece to ensure that it fits tightly with the positioning block 3 and is accurately positioned.

[0048] 5. Tightening: After the workpiece position is adjusted, tighten the bolts on the connecting rod 5 of the pressure plate 9 to firmly press the workpiece against the pressure plate 9. When tightening the bolts, apply force evenly to avoid uneven stress or damage to the workpiece. After tightening the bolts, check the workpiece's fixation again to ensure that it will not loosen or shift during processing.

[0049] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this utility model.

Claims

1. A suction cap integration tooling, characterized in that, Includes a base plate, which has several sets of positioning holes. Corresponding sets of positioning blocks are installed on the sets of positioning holes. The sets of positioning blocks are located below the air intake cover. The positioning blocks are connected to the pressure plate via connecting rods. One end of the pressure plate is positioned above the air intake cover and in contact with the upper surface of the air intake cover, while the other end is screwed to the top rod. The positioning block and the outer end of the pressure plate are connected to the top rod. The pressure plate is provided with a second mounting hole, which is a slot-shaped hole. The connecting rod passes through the second mounting hole to fix the pressure plate and the positioning hole. The connecting rod can move along the length of the hole within the second mounting hole.

2. The air intake cover integration tool of claim 1, wherein, The positioning hole group includes several positioning holes, which are distributed circumferentially along the center of the base plate. The base plate is a circular plate, which is fixed on several bases. The bases are evenly distributed circumferentially on the lower surface of the base plate near the side. The bases are rectangular blocks.

3. The integrated air suction cover tooling according to claim 1 or 2, wherein, Different sets of positioning holes have different positions and diameters on the base plate.

4. The air intake cover integration tool of claim 3, wherein, The positioning block group consists of several positioning blocks, which are distributed circumferentially along the center of the base plate. The positioning blocks are rectangular blocks, with one end in contact with the bottom surface of the air intake cover.

5. The integrated air suction cover tooling according to claim 1 or 4, wherein, The positioning block has several first mounting holes. The positioning block is fixed to the base plate through the first mounting holes. Bolts pass through the first mounting holes and the positioning holes to fix the positioning block in the corresponding position on the base plate.

6. The air intake cover integration tool of claim 1, wherein, The pressure plate and the positioning block are arranged in parallel, and the connecting rod is connected to a nut above the second mounting hole of the pressure plate.

7. The air intake cover integration tool of claim 6, wherein, The connecting rod has a nut above the positioning block.

8. A suction cap integration tooling according to claim 1, 6, or 7, characterized in that, The width of the end of the pressure plate that contacts the air intake cover is smaller than the width of the other end of the pressure plate, and the width of the end of the pressure plate that contacts the air intake cover is smaller than the width of other parts of the pressure plate.

9. The suction cap integration fixture according to claim 1, characterized in that, The base plate is provided with a side top support component, which includes a side top rod at one end that abuts against the side of the air intake cover. The side top support component includes a side top seat, which is inverted T-shaped and is fixed to the base plate by bolts and nuts. The top of the side top seat is provided with an adjustment hole.

10. The suction cap integration fixture according to claim 9, characterized in that, The side top seat is fixed on the base plate. The side top rod passes through the adjustment hole at the top of the side top seat and abuts against the side of the air intake cover. The diameter of the side top rod is smaller on the side of the side top seat near the air intake cover and larger on the other side of the side top seat, forming a limiting boss.

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