Upper crankcase clamping structure during machining of main bearing hole of crankcase of door-type structure

Abstract

The utility model provides an upper crankcase clamping structure for machining a main bearing hole of a door type structure crankcase, which comprises a base, a plurality of cutter bar supporting seats are arranged on the upper surface of the base side by side, a plurality of box body supporting seats are arranged on the upper surface of the base and positioned on the front sides and the rear sides of the cutter bar supporting seats, and supporting sleeves are sleeved on the upper portions of the cutter bar supporting seats. The cutter bar is horizontally sleeved with the multiple supporting sleeves, gaps are formed between the cutter bar and the supporting sleeves, a plurality of boring cutter assemblies are fixedly connected to the cutter bar, the upper sides of the multiple box body supporting bases are jointly and fixedly connected with a box body, a plurality of partition plates are arranged on the inner side of the box body side by side, each partition plate is provided with a main bearing hole, and the multiple main bearing holes are coaxially formed. The cutter bar penetrates through a plurality of main bearing holes in the inner side of the box body, each boring cutter assembly corresponds to one main bearing hole, and each boring cutter assembly is located on the left side of the corresponding main bearing hole. The device has the beneficial effects that the problem of precision deviation caused by the influence of a super-long overhanging fine boring cutter in the machining process is effectively reduced.

Description

Technical Field

[0001] The utility model belongs to the field of crankcase processing equipment, and particularly relates to a clamping structure for the upper crankcase when machining the main bearing holes of a gantry-structured crankcase. Background Art

[0002] In order to achieve the lightweight and high-power of the upper crankcase of the gantry structure, the cast aluminum material is selected for the material of the crankcase. The crankcase is divided into 6-cylinder, 8-cylinder, 10-cylinder, and 12-cylinder according to power and use. Its main bearing hole is the main power output bearing capacity part of the crankcase and is also a key part of the crankcase. The geometric tolerance requirements for this part are very strict, and the accuracy of this part affects the position accuracy between the entire crankcase and the main bearing hole.

[0003] Currently, when machining the main bearing holes, for the crankcase with four or fewer main bearing holes, an ultra-long overhang fine boring tool is selected to finish machine the main bearing holes unilaterally. If an ultra-long overhang fine boring tool is used for the crankcase with more than four main bearing holes, it is no longer possible to meet the requirement of unilateral finish machining, and bilateral facing finish machining is selected.

[0004] Due to the influence of the overhang length and self-weight of the ultra-long overhang fine boring tool, there will be accuracy deviation. It is extremely difficult to control the accuracy instability caused by the deviation during boring, resulting in a low qualified rate of the key dimensions of the crankcase. The bilateral facing boring is extremely challenging for the operation level and the accuracy of the machine tool during the middle docking. It is necessary to repeatedly trial cut and finely adjust the deviation value. Due to the overhang length problem of the tool and the vibration occurring during the boring operation, the surface finish of the machined hole is affected to a certain extent. And in order to avoid tool vibration, other measures will be taken additionally to control it, resulting in serious waste of time during finish machining and a significant increase in the unqualified rate, affecting the progress of the scientific research and trial production tasks. Summary of the Utility Model

[0005] In view of this, the utility model aims to overcome the above deficiencies in the prior art and proposes a clamping structure for the upper crankcase when machining the main bearing holes of a gantry-structured crankcase.

[0006] To achieve the above object, the technical solution of the utility model is realized as follows:

[0007] The clamping structure for the upper crankcase during the machining of the main bearing holes of a gantry-structured crankcase includes a base. On the upper surface of the base, a plurality of tool bar support seats are arranged side by side, and a plurality of housing support seats are provided on both the front and rear sides of the tool bar support seats on the upper surface of the base. Support sleeves are sleeved on the upper parts of the tool bar support seats. The tool bar is horizontally sleeved in a plurality of support sleeves, and there is a gap between the tool bar and the support sleeves. A plurality of boring tool assemblies are fixedly connected to the tool bar. A housing is fixedly connected to the upper sides of the plurality of housing support seats. Inside the housing, a plurality of partitions are arranged side by side, and a main bearing hole is opened on each partition. The plurality of main bearing holes are coaxially arranged. The tool bar passes through the plurality of main bearing holes on the inner side of the housing. Each boring tool assembly corresponds to a main bearing hole, and each boring tool assembly is located on the left side of the corresponding main bearing hole.

[0008] Further, a through hole is opened on the upper part of the tool bar support seat. The support sleeve is sleeved and fixed in the through hole. An oil inlet groove is vertically opened at the top of the tool bar support seat. An oil inlet hole is opened on the support sleeve corresponding to the oil inlet groove, and an annular groove communicating with the oil inlet hole is opened on the inner wall of the support sleeve. A plurality of oil storage grooves communicating with the annular groove are uniformly arranged on the inner wall of the support sleeve. Lubricating oil is provided in the annular groove.

[0009] Further, a convex edge is provided on the circumferential outer side of one end of the support sleeve, and the convex edge abuts against the side wall of the tool bar support seat.

[0010] Further, the boring tool assembly includes a tool disc and a tool bit fixedly connected to the circumferential surface of the tool disc. The tool disc is an annular structure with an opening along the width direction on the circumferential surface. The tool disc is sleeved on the tool bar and fixedly connected together at the opening through fastening screws.

[0011] Further, the distance between the tip position of the tool bit of the boring tool assembly at the leftmost side near the free end of the tool bar and the corresponding partition is 5 mm, and the distance between the side wall of the tool disc of other boring tool assemblies facing the corresponding partition and the corresponding partition is 5 mm.

[0012] Further, stop grooves coaxially arranged with the main bearing holes are circumferentially provided on both sides of the main bearing hole corresponding to the free end of the tool bar for installing a stop pad for the crankshaft.

[0013] Further, the radial dimension of the gap is 0.01 - 0.03 mm.

[0014] Further, the tool bit is made of cermet.

[0015] Furthermore, a pressing screw rod is vertically and fixedly connected to the upper side of each box body support seat. A pressing block is provided in the exhaust gas port on the box body. The inner end of the pressing block presses the exhaust gas port, and a strip-shaped hole is provided at the outer end. The pressing screw rod passes through the strip-shaped hole, and a nut that is screwed and pressed on the upper side of the pressing block is provided on the pressing screw rod. A top column is provided between the bottom of the pressing block and the box body support seat. A tightening bolt is screwed on the upper side of the top column. The bottom of the top column abuts against the upper surface of the box body support seat, and the top of the tightening bolt abuts against the bottom of the pressing block.

[0016] Compared with the prior art, the present utility model has the following advantages:

[0017] When machining the main bearing hole of the portal structure crankcase described in the present utility model, the upper crankcase clamping structure supports and fixes the box body through the box body support seat, and horizontally connects the tool bar through the tool bar support seat, so that the tool bar can horizontally move along the support sleeve and then drive the boring tool assembly to perform fine boring operation on the main bearing hole; this device can meet the use of box bodies of different cylinder numbers, and can effectively reduce the precision deviation problem affected by the ultra-long overhanging fine boring tool during the machining process, so as to improve the qualified rate and production efficiency of products. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings constituting a part of the present utility model are used to provide a further understanding of the present utility model. The schematic embodiments of the present utility model and their descriptions are used to explain the present utility model and do not constitute an improper limitation to the present utility model. In the drawings:

[0019] Figure 1 It is a schematic diagram of the upper crankcase clamping structure during the machining of the main bearing hole of the portal structure crankcase described in the embodiment of the present utility model;

[0020] Figure 2 It is a schematic diagram of the structure of the upper crankcase clamping structure after removing the box body during the machining of the main bearing hole of the portal structure crankcase described in the embodiment of the present utility model;

[0021] Figure 3 It is a schematic diagram of the structure of the upper crankcase clamping structure in a sectional view state of the box body during the machining of the main bearing hole of the portal structure crankcase described in the embodiment of the present utility model;

[0022] Figure 4 It is a schematic diagram of the structure of the support sleeve described in the embodiment of the present utility model;

[0023] Figure 5 It is a schematic diagram of the structure of the boring tool assembly described in the embodiment of the present utility model.

[0024] Description of the reference numerals:

[0025] 1. Base; 2. Tool bar support seat; 201. Oil inlet groove; 3. Box body support seat; 4. Support sleeve; 401. Oil inlet hole; 402. Annular groove; 403. Oil storage tank; 404. Convex edge; 5. Tool bar; 6. Boring tool assembly; 601. Tool disc; 602. Tool bit; 603. Opening; 7. Fixed bolt; 8. Compression screw; 9. Box body; 901. Partition board; 902. Main bearing hole; 903. Exhaust port; 10. Fastening screw; 11. Pressure block; 12. Nut; 13. Jacking post; 14. Tightening bolt. Detailed implementation mode

[0026] It should be noted that, without conflict, the embodiments in the present utility model and the features in the embodiments can be combined with each other.

[0027] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present utility model. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present utility model, unless otherwise specified, the meaning of "a plurality" is two or more.

[0028] In the description of the present utility model, it should be noted that, unless otherwise clearly defined and limited, the terms "installation", "connection", "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood through specific situations.

[0029] The present utility model will be described in detail below with reference to the drawings and in combination with the embodiments.

[0030] As shown in the figure, the clamping structure of the upper crankcase during the machining of the main bearing holes of the gantry-type crankcase includes a base 1. On the upper surface of the base 1, a plurality of tool bar 5 support seats 2 are arranged side by side, and a plurality of crankcase 9 support seats 3 are arranged on both the front and rear sides of the tool bar 5 support seats 2 on the upper surface of the base 1. Support sleeves 4 are sleeved on the upper parts of the tool bar 5 support seats 2. The tool bar 5 is horizontally sleeved in a plurality of support sleeves 4, and there is a gap between the tool bar 5 and the support sleeves 4. A plurality of boring tool assemblies 6 are fixedly connected to the tool bar 5. A crankcase 9 is fixedly connected to the upper sides of the plurality of crankcase 9 support seats 3. A plurality of partition plates 901 are arranged side by side inside the crankcase 9. Each partition plate 901 is provided with a main bearing hole 902. The plurality of main bearing holes 902 are coaxially arranged. The tool bar 5 passes through the plurality of main bearing holes 902 inside the crankcase 9. Each boring tool assembly 6 corresponds to a main bearing hole 902, and each boring tool assembly 6 is located on the left side of the corresponding main bearing hole 902. In this embodiment, the crankcase 9 is fixedly connected to the crankcase 9 by a plurality of fixing bolts 7. In this embodiment, the crankcase 9 is supported and fixed by the crankcase 9 support seats 3, and the tool bar 5 is horizontally connected to the tool bar 5 through the tool bar 5 support seats 2, so that the tool bar 5 can horizontally move along the support sleeve 4 to drive the boring tool assembly 6 to perform fine boring operations on the main bearing holes 902. This device meets the use of crankcases 9 of different cylinder numbers, and can effectively reduce the precision deviation problem affected by the ultra-long overhanging fine boring tool during the machining process, so as to improve the qualified rate and production efficiency of products.

[0031] A through hole is provided in the upper part of the tool bar 5 support seat 2. The support sleeve 4 is sleeved and fixed in the through hole. An oil inlet groove 201 is vertically provided at the top of the tool bar 5 support seat 2. An oil inlet hole 401 is provided on the support sleeve 4 corresponding to the oil inlet groove 201. An annular groove 402 communicating with the oil inlet hole 401 is provided on the inner wall of the support sleeve 4. A plurality of oil storage grooves 403 communicating with the annular groove 402 are uniformly provided on the inner wall of the support sleeve 4. Lubricating oil is provided in the annular groove 402. In this embodiment, lubricating oil is injected into the annular groove 402 through the oil inlet groove 201 to facilitate the rotation and forward and backward movement of the tool bar 5 in the support sleeve 4. And the redundant lubricating oil is stored and reserved through the oil storage grooves 403.

[0032] A convex edge 404 is provided on the circumferential outer side of one end of the support sleeve 4, and the convex edge 404 abuts against the side wall of the tool bar 5 support seat 2. In this embodiment, the support sleeve 4 is interference-fitted on the tool bar 5 support seat 2 and is limited by the convex edge 404.

[0033] The boring tool assembly 6 includes a tool disc 601 and a tool bit 602 fixedly connected to the circumferential surface of the tool disc 601. The tool disc 601 is a ring-shaped structure with an opening 603 along the width direction on the circumferential surface. The tool disc 601 is sleeved on the tool bar 5 and is fixedly connected together at the opening 603 through a fastening screw 10. In this embodiment, the fastening screw 10 is tightened with a torque of 20 N·m to fix the tool disc 601 on the tool bar 5.

[0034] The distance between the tip position of the cutting head 602 on the boring tool assembly 6 at the leftmost side near the free end of the tool bar 5 and the corresponding partition 901 is 5 mm. The distance between the side wall of the cutter head 601 of the other boring tool assemblies 6 facing the corresponding partition 901 and the corresponding partition 901 is 5 mm. That is, in the forward direction of boring, the distance between the other boring tool assemblies 6 and the corresponding partition 901 is 5 mm.

[0035] Circumferentially provided with a stop groove coaxial with the main bearing hole 902 on both sides of the main bearing hole 902 corresponding to the free end of the tool bar 5 for installing the stop pad of the crankshaft.

[0036] The radial dimension of the clearance is 0.01 - 0.03 mm.

[0037] The cutting head 602 is made of cermet.

[0038] On the upper side of each support seat 3 of the box body 9, a pressing screw 8 is vertically fixed. A pressing block 11 is provided in the exhaust gas port 903 of the box body 9. The inner end of the pressing block 11 presses the exhaust gas port 903, and the outer end is provided with a strip hole. The pressing screw 8 passes through the strip hole, and a nut 12 is screwed on the pressing screw 8 and presses on the upper side of the pressing block 11. A top column 13 is provided between the bottom of the pressing block 11 and the support seat 3 of the box body 9. A top bolt 14 is screwed on the upper side of the top column 13. The bottom of the top column 13 abuts against the upper surface of the support seat 3 of the box body 9, and the top of the top bolt 14 abuts against the bottom of the pressing block 11. To further strengthen the stability of the box body 9 and ensure the stability of the box body 9 during boring.

[0039] In this embodiment, both sides of the base 1 are provided with connecting edges for fixing on the machine tool.

[0040] The working process of this embodiment is as follows:

[0041] During installation, the orientation of the tip of the cutting head 602 needs to be consistent with the forward rotation direction of the machine tool; during boring, push boring is adopted. While the machine tool controls the rotation of the tool bar 5 to make the cutting head 602 perform boring, it will also move forward to ensure the completion of the boring of the entire main bearing hole 902, and the advancing distance of the tool bar 5 must be greater than the depth distance of the hole to be bored to ensure that all hole diameters are bored in one pass.

[0042] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. The upper crankcase clamping structure when machining the main bearing hole of the gate-type crankcase is characterized by: It includes a base, a plurality of tool rod support seats are arranged side by side on the upper surface of the base, and a plurality of box support seats are arranged on the upper surface of the base at the front and rear sides of the tool rod support seats, the upper parts of the tool rod support seats are sleeved with support sleeves, the tool rods are horizontally sleeved in the plurality of support sleeves, and gaps are arranged between the support sleeves, a plurality of boring tool assemblies are fixedly connected to the tool rod, a box is commonly fixedly connected to the upper sides of the plurality of box support seats, a plurality of partitions are arranged side by side on the inner side of the box, a main bearing hole is opened on each partition, the plurality of main bearing holes are coaxially arranged, the tool rod passes through the plurality of main bearing holes on the inner side of the box, each boring tool assembly corresponds to a main bearing hole, and each boring tool assembly is located on the left side of the corresponding main bearing hole.

2. The upper crankcase clamping structure for machining the main bearing hole of the gate-type crankcase according to claim 1 is characterized in that: A through hole is opened on the upper part of the tool rod support seat, the support sleeve is sleeved and fixed in the through hole, and an oil inlet groove is opened vertically on the top of the tool rod support seat, an oil inlet hole is opened on the support sleeve corresponding to the oil inlet groove, and an annular groove connected with the oil inlet hole is opened on the inner wall of the support sleeve, and multiple oil storage grooves connected with the annular grooves are evenly arranged on the inner wall of the support sleeve, and lubricating oil is arranged in the annular grooves.

3. The upper crankcase clamping structure for machining the main bearing hole of the gate-type crankcase according to claim 2 is characterized in that: One end of the support sleeve is provided with a convex edge outwardly in the circumferential direction, and the convex edge abuts against the side wall of the knife rod support seat.

4. The upper crankcase clamping structure for machining the main bearing hole of a gate-type crankcase according to claim 1, characterized in that: The boring tool assembly includes a cutter disc and a cutter head fixed on the circumferential surface of the cutter disc, and the cutter disc is an annular structure opened along the width direction on the circumferential surface. The cutter disc is sleeved on the cutter rod and fixed together at the opening by fastening screws.

5. The upper crankcase clamping structure for machining the main bearing hole of the gate-type crankcase according to claim 4 is characterized in that: The distance between the tip of the tool head on the boring tool assembly at the leftmost side near the free end of the tool rod and the corresponding partition is 5 mm, and the distance between the side wall of the tool disc of other boring tool assemblies facing the corresponding partition and the corresponding partition is 5 mm.

6. The upper crankcase clamping structure for machining the main bearing hole of a gate-type crankcase according to claim 1, characterized in that: The radial dimension of the gap is 0.01-0.03 mm.

7. The upper crankcase clamping structure for machining the main bearing hole of a gate-type crankcase according to claim 4, characterized in that: The cutter head is made of metal ceramic.

8. The upper crankcase clamping structure for machining the main bearing hole of a gate-type crankcase according to claim 1, characterized in that: A clamping screw is vertically fixed on the upper side of each box support seat, a pressure block is provided in the exhaust port on the box, and the inner end of the pressure block presses the exhaust port, and a strip hole is provided at the outer end, the clamping screw passes through the strip hole, and the clamping screw is threaded with a nut that is clamped on the upper side of the pressure block, and a top column is provided between the bottom of the pressure block and the box support seat, a clamping bolt is threaded on the upper side of the top column, the bottom of the top column abuts against the upper surface of the box support seat, and the top of the clamping bolt abuts against the bottom of the pressure block.

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