CN219344781U - Combined camshaft and engine - Google Patents

Abstract

The utility model belongs to the field of engines, and particularly relates to a combined camshaft and an engine. The combined camshaft comprises a plurality of shaft rod sections, at least one cam sheet and at least one bearing; each shaft rod section is provided with at least one first flange, a plurality of shaft rod sections are axially arranged, and one ends of two adjacent shaft rod sections facing each other are connected to a bearing; the cam sheet is sleeved on the shaft rod section and is clamped between the first flange plate and the bearing. The scheme that this disclosure provided is easier to realize, and the universalization is better, and fault-tolerant rate is higher, and the disability rate is low, reduce cost, secondly, the axostylus axostyle section can adopt the thick member of wall thickness, and its structural strength is higher, correspondingly, possesses the combination camshaft of this axostylus axostyle section also and possesses better structural strength. In addition, each component can be flexibly configured, which is beneficial to reducing development period.

Description

Combined camshaft and engine

Technical Field

The utility model belongs to the field of engines, and particularly relates to a combined camshaft and an engine.

Background

The existing automobile engine combined camshaft is generally assembled by hollow steel pipes and steel cams with holes. At present, two assembly processes mainly exist, namely, after a cam penetrates into a hollow steel pipe, the outer diameter of the hollow steel pipe is permanently increased by pressing a steel ball into a central hole of the hollow steel pipe; secondly, the outer diameter of the hollow steel pipe is permanently increased by pressurizing (such as water pressure or oil pressure) in the central hole of the hollow steel pipe; the hollow steel pipe and the cam are changed from clearance fit into interference fit through the two processes, so that the cam is fixed on the hollow steel pipe.

In both of the above processes, at least the following problems exist:

firstly, the wall thickness of the hollow steel tube is thinner due to the deformation amount to be ensured, so that the structural strength is poorer;

secondly, the steel balls have larger abrasion loss along with the increase of the use frequency, so that the risk of insufficient interference is larger;

thirdly, the assembly precision requirement of the hollow steel tube and the cam is high, materials cannot be reworked after failure, and the cost is high.

In view of this, the present application is specifically proposed.

Disclosure of Invention

The utility model provides a combined camshaft and an engine, which aim to solve the technical problems in the prior art.

The first aspect of the present utility model provides a combined camshaft comprising a plurality of shaft segments, at least one cam plate and at least one bearing; each shaft rod section is provided with at least one first flange, a plurality of shaft rod sections are axially arranged, and one ends of two adjacent shaft rod sections facing each other are connected to a bearing; the cam sheet is sleeved on the shaft rod section and is clamped between the first flange plate and the bearing.

In an alternative aspect of the utility model, the plurality of shaft segments includes a head shaft segment, at least one intermediate shaft segment, and a tail shaft segment, the intermediate shaft segment being located between the head shaft segment and the tail shaft segment;

the combined camshaft is further provided with a tightening structure, the tightening structure is used for applying torque to the combined camshaft, the tightening structure comprises a first torsion part and a second torsion part, the first torsion part is arranged on the head shaft rod section, and the second torsion part is arranged on the tail shaft rod section.

In an alternative aspect of the utility model, the tail shaft section comprises a first tail shaft section and a second tail shaft section spliced in an axial direction, the first tail shaft section is arranged close to the intermediate shaft section, and the second torsion portion is arranged on the second tail shaft section.

In an alternative aspect of the utility model, the combined camshaft further includes a signal wheel coupled to the second tail shaft section for observing the rotational phase of each cam lobe.

In an alternative aspect of the utility model, the first tail shaft section is provided with a second flange, and the second tail shaft section is provided with a third flange; the combined camshaft also comprises a high-pressure oil pump cam, and the high-pressure oil pump cam is used for driving the high-pressure oil pump to operate; the high-pressure oil pump cam is sleeved on the first tail shaft rod section, and a part of the second tail shaft rod section is inserted into the first tail shaft rod section and connected with the first tail shaft rod section, so that the second flange plate and the third flange plate clamp the high-pressure oil pump cam together.

In an alternative aspect of the present utility model, the first torsion portion is one of a hexagonal annular protrusion and a hexagonal hole, and the second torsion portion is the other; or the first torsion part and the second torsion part are hexagonal annular protrusions; alternatively, the first torsion portion and the second torsion portion are hexagonal holes.

In an alternative scheme of the utility model, the side wall of the first flange plate, which is close to the cam plate, is provided with anti-skid grains.

In an alternative scheme of the utility model, the cam plate is provided with a cam plate shaft hole allowing the shaft rod section to pass through, and a first sinking groove and a second sinking groove, wherein the first sinking groove and the second sinking groove are respectively positioned at two axial ends of the cam plate shaft hole;

at least part of the first flange plate is embedded in the first sinking groove, and at least part of the bearing is embedded in the second sinking groove.

In an alternative embodiment of the utility model, the shaft section is screwed to the bearing.

In a second aspect the utility model provides an engine comprising a combined camshaft as described above.

Compared with the prior art, the utility model has the following beneficial effects:

the combined camshaft provided by the utility model is formed by assembling the multi-section shaft rod section, the cam piece and the bearing, the first flange plate is arranged on the shaft rod section to be matched with the bearing to fix the cam piece, and compared with the technical scheme of expanding the diameter of the shaft rod through pressurization, which is mentioned in the prior art, the scheme provided by the utility model is easier to realize, better in generalization, higher in fault tolerance rate, low in rejection rate and lower in cost, and secondly, the shaft rod section can adopt a rod piece with thicker wall thickness, the structural strength is higher, and correspondingly, the combined camshaft with the shaft rod section also has better structural strength. In addition, each component can be flexibly configured, which is beneficial to reducing development period.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present utility model, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic illustration of a combined camshaft provided in accordance with one embodiment of the present utility model;

FIG. 2 is an exploded view of the assembled camshaft of FIG. 1;

FIG. 3 is a cross-sectional view of the assembled camshaft of FIG. 1;

fig. 4 is a schematic view of a cam plate provided according to one embodiment of the present utility model.

Reference numerals

10. A combined camshaft;

11. a shaft section; 111. a head shaft section; 112. an intermediate shaft section; 113. a tail shaft section; 1131. a first tail shaft section; 1132. a second tail shaft section;

12. a cam plate; 13. a bearing; 14. a signal wheel; 15. a high pressure oil pump cam;

11a, a first flange plate; 11b, a second flange plate; 11c, a third flange plate; 11d, a first torsion portion; 11e, a second torsion part;

A. a cam plate shaft hole; b1, a first sinking groove; b2, a second sinking groove.

Detailed Description

To further clarify the above and other features and advantages of the present utility model, a further description of the utility model will be rendered by reference to the appended drawings. It should be understood that the specific embodiments presented herein are for purposes of explanation to those skilled in the art and are intended to be illustrative only and not limiting.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present utility model, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

FIG. 1 is a schematic illustration of a combined camshaft provided in accordance with one embodiment of the present utility model; FIG. 2 is an exploded view of the assembled camshaft of FIG. 1; fig. 3 is a cross-sectional view of the assembled camshaft of fig. 1. Referring to fig. 1-3, a first aspect of the present utility model provides a combined camshaft 10, the combined camshaft 10 comprising a plurality of shaft segments 11, at least one cam plate 12 and at least one bearing 13.

In the present disclosure, a bearing 13 is provided between two adjacent shaft segments 11, one end of the two adjacent shaft segments 11 facing each other is connected to the bearing 13, and each shaft segment 11 is assembled in the axial direction by the bearing 13, that is, the plurality of shaft segments 11 are arranged in the axial direction.

Further, each shaft section 11 is provided with at least one first flange 11a, and the cam piece 12 is sleeved on the shaft section 11 and abuts against the bearing 13 under the action of the first flange 11a, so that the first flange 11a clamps the cam piece 12 together with the bearing 13, thereby forming the combined camshaft 10.

In a specific application, the first flange 11a is an annular boss disposed on the shaft section 11, and the cam plate 12 and the bearing 13 can be sleeved on the bearing section 11, so that the outer diameter of the bearing 13 and the first flange 11a are at least larger than the inner diameter of the cam plate 12, and the cam plate 12 and the bearing can be matched to form an axial limit on the cam plate 12, thereby fixing the cam plate 12.

It can be seen that, the combination camshaft 10 that this disclosure provided is assembled through multistage axostylus axostyle section 11, cam piece 12 and bearing 13, through set up first ring flange 11a on axostylus axostyle section 11 with the cooperation bearing 13 realize the fixed to cam piece 12, compare in the technical scheme that enlarges axostylus axostyle pipe diameter through the pressurization that prior art mentioned, the scheme that this disclosure provided is easier to realize, the universalization is better, fault-tolerant rate is higher, the disability rate is low, reduce cost, secondly, axostylus axostyle section 11 can adopt the thick member of wall thickness, for example cast member spare etc. its structural strength is higher, correspondingly, the combination camshaft 10 that possesses this axostylus axostyle section 11 also possesses better structural strength. In addition, each component can be flexibly configured, which is beneficial to reducing development period.

As described in the background art, the existing cam is a steel cam to be able to withstand a large radial force in the diameter expansion process. In this embodiment, the cam plate 12 may be made of powder metallurgy, cast iron, etc., which is beneficial to cost reduction. Secondly, the existing solution requires limiting the wall thickness of the shaft, resulting in an oversized hole diameter of the central through hole of the shaft, which presents an oversized oil storage problem, whereas the wall thickness of the shaft section 11 in the prior art is increased, the hole diameter of the central through hole is relatively small, reducing the risk of oversized oil storage.

In a preferred embodiment, the shaft section 11 is screwed with the bearing 13. In a specific application, the end of the shaft segment 11 is provided with external threads, the bearing 13 is provided with internal threads, and the two threads are connected, so that axial compression force can be applied to the cam plate 12. In this way, a larger friction force is formed between the cam piece 12 and the first flange 11a and the bearing 13, so that the risk of relative rotation between the cam piece 12 and the shaft rod section 11 is reduced, and the fixing effect is ensured.

Further, the side wall of the first flange 11a, which is close to the cam plate 12, is provided with anti-slip lines to increase the friction coefficient and further increase the friction force. In a specific application, the anti-slip pattern may be engraved on the sidewall of the first flange 11a by a laser engraving process, which is not limited thereto.

Fig. 4 is a schematic view of a cam plate provided according to one embodiment of the present utility model. Referring to fig. 4, in the present disclosure, the cam plate 12 is provided with a cam plate shaft hole a allowing the shaft rod section 11 to pass through, and a first sink B1 and a second sink B2, wherein the first sink B1 and the second sink B2 are respectively located at two axial ends of the cam shaft hole a, at least part of the first flange 11a is embedded in the first sink B1, and at least part of the bearing 13 is embedded in the second sink B2. So configured, the cam plate 12 can be radially constrained during assembly.

It should be noted that the torque that the threaded connection can withstand needs to exceed the torque that the cam plate 12 can withstand, so that it is ensured that the shaft section 11 and the bearing 13 cannot disengage. In order to ensure the connection stability of the shaft section 11 to the bearing 13, glue may even be injected between the shaft section 11 and the bearing 13.

In the present disclosure, the plurality of shaft segments 11 includes a head shaft segment 111, at least one intermediate shaft segment 112, and a tail shaft segment 113, the intermediate shaft segment 112 being located between the head shaft segment 111 and the tail shaft segment 113. In other words, the combined camshaft 10 is assembled from at least three shaft segments 11, with the number of intermediate shaft segments 112 being 2 in the illustrated embodiment.

Further, the assembled camshaft 10 is further provided with a tightening structure for applying torque to the assembled camshaft 10. The tightening structure includes a first torsion portion 11d and a second torsion portion 11e, the first torsion portion 11d being provided at the head shaft section 111, and the second torsion portion 11e being provided at the tail shaft section 113.

Referring to fig. 2 and 3, in a specific application, the first torsion portion 11d is a hexagonal ring protrusion, and the second torsion portion 11e is a hexagonal hole. For ease of understanding, the manual assembly process is illustrated by assembling the head shaft section 111, the intermediate shaft section 112, the tail shaft section 113, the plurality of bearings 13 and the plurality of cam plates 12 in the axial direction for pre-assembly, then fixing the hexagonal ring by using an adjustable wrench, selecting a proper size socket wrench to fit the hexagonal hole, and screwing and fixing each component by twisting the socket wrench. Or the adjustable spanner and the inner hexagonal spanner are twisted in opposite directions, so that the screwing and fixing can be realized. Of course, the tightening may also be achieved by tightening means, which are not described in detail here.

It will be appreciated that in a particular application, one of the two torsion portions is used for fixation and the other is used for torsion activity; alternatively, both torsion portions can be movable. Of course, the torsion portion 11d is not limited to the illustrated embodiment, for example, the first torsion portion 11d may be a hexagonal hole, and the second torsion portion 11e may be a hexagonal annular protrusion, and may also be used to apply torque to the assembled camshaft 10; alternatively, the first torsion portion 11d and the second torsion portion 11e are both hexagonal annular protrusions, i.e., both are adapted to an adjustable wrench tool to apply torque to the assembled camshaft 10; alternatively, the first and second torsion portions 11d and 11e are hexagonal holes, and both may be adapted to an allen wrench to apply torque to the assembled camshaft 10.

In the present disclosure, the tail shaft section 113 includes a first tail shaft section 1131 and a second tail shaft section 1132 that are spliced in an axial direction. The first tail shaft section 1131 is disposed near the intermediate shaft section 112, i.e., the first tail shaft section 1131 is disposed axially inward and the second tail shaft section 1132 is disposed axially outward, and the second torsion portion 11e is disposed on the second tail shaft section 1132 for facilitating use of the tightening tool. In the embodiment shown in FIG. 3, the second torsion portion 11e is a hexagonal hole at the end of the second tail shaft section 1132 to facilitate tool insertion.

In the case of a direct injection engine, a high-pressure oil pump is required. In an alternative embodiment, the combination camshaft 10 further includes a high pressure oil pump cam 15, the high pressure oil pump cam 15 being used to drive the high pressure oil pump operation.

In the present disclosure, the first tail shaft section 1131 is provided with a second flange 11b and the second tail shaft section 1132 is provided with a third flange 11c. The high-pressure oil pump cam 15 is sleeved on the first tail shaft section 1131, and a part of the second tail shaft section 1132 is inserted into the first tail shaft section 1131 and connected to the first tail shaft section 1131, so that the second flange 11b and the third flange 11c clamp the high-pressure oil pump cam 15 together. Specifically, the high-pressure oil pump cam 15 is first mounted on the first tail shaft section 1131 and abuts against the second flange 11b, and then the second tail shaft section 1132 is connected to the first tail shaft section 1131 until the third flange 11c abuts against the high-pressure oil pump cam 15, so that the high-pressure oil pump cam 15 is axially limited.

It will be appreciated that to enable assembly of the entire assembled camshaft 10 by a screw-down arrangement, the first tail shaft section 1131 is preferably threadably coupled to the second tail shaft section 1132. Of course, in order to reduce the risk of relative rotation between the high pressure pump cam 15 and the first tail shaft section 1131, the sidewalls of the second flange 11b and the third flange 11c, which are adjacent to the high pressure pump cam 15, are provided with anti-skid lines.

It should be noted that the first tail shaft section 1131 and the second tail shaft section 1132 may also be connected through the bearing 13, which is not limited in particular.

In the present disclosure, the combined camshaft 10 further includes a signal wheel 14, the signal wheel 14 being connected to the second tail shaft segment 1132 for observing the rotational phase of each cam lobe 12. Specifically, the peripheral side of the signal wheel 14 is formed with a plurality of notches arranged in one-to-one correspondence with the protruding tips of the plurality of cam pieces 12, and the rotational phase of each cam piece 12 is determined by observing the positions of the plurality of notches.

In the above embodiments, the constituent members are screwed, but the present utility model is not limited to screwed connection.

In a second aspect the utility model provides an engine comprising a combined camshaft as described above. Obviously, the engine has all the advantages deriving from the above-mentioned combined camshaft, and is not described in detail here.

Further, it will be understood by those skilled in the art that if all or part of the sub-modules involved in each product provided by the embodiments of the present utility model are combined, replaced by fusion, simple variation, mutual transformation, etc., such as each component being placed in a moving position; or the products formed by the two are integrally arranged; or a removable design; it is within the scope of the present utility model to replace the corresponding components of the present utility model with devices/apparatuses/systems that may be combined to form a device/apparatus/system having a specific function.

In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present utility model. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

While embodiments of the present utility model have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the utility model, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the utility model.

Claims (10)

1. -a combined camshaft, characterized in that the combined camshaft (10) comprises a plurality of shaft segments (11), at least one cam plate (12) and at least one bearing (13);

each shaft rod section (11) is provided with at least one first flange (11 a), a plurality of shaft rod sections (11) are axially arranged, and one ends of two adjacent shaft rod sections (11) facing each other are connected to the bearing (13);

the cam piece (12) is sleeved on the shaft rod section (11) and is clamped between the first flange plate (11 a) and the bearing (13).

2. The combined camshaft according to claim 1, characterized in that the plurality of shaft segments (11) comprises a head shaft segment (111), at least one intermediate shaft segment (112) and a tail shaft segment (113), the intermediate shaft segment (112) being located between the head shaft segment (111) and tail shaft segment (113);

the combined camshaft (10) is further provided with a tightening structure, the tightening structure is used for applying torque to the combined camshaft (10), the tightening structure comprises a first torsion part (11 d) and a second torsion part (11 e), the first torsion part (11 d) is arranged on the head shaft rod section (111), and the second torsion part (11 e) is arranged on the tail shaft rod section (113).

3. The combined camshaft of claim 2, wherein the tail shaft section (113) comprises a first tail shaft section (1131) and a second tail shaft section (1132) spliced along an axial direction, the first tail shaft section (1131) is arranged close to the intermediate shaft section (112), and the second torsion part (11 e) is arranged at the second tail shaft section (1132).

4. A combined camshaft according to claim 3, characterized in that the combined camshaft (10) further comprises a signal wheel (14), which signal wheel (14) is connected to the second tail shaft section (1132) for observing the rotational phase of each cam plate (12).

5. A combined camshaft according to claim 3, wherein,

the first tail shaft section (1131) is provided with a second flange plate (11 b), and the second tail shaft section (1132) is provided with a third flange plate (11 c);

the combined camshaft (10) further comprises a high-pressure oil pump cam (15), and the high-pressure oil pump cam (15) is used for driving the high-pressure oil pump to operate;

the high-pressure oil pump cam (15) is sleeved on the first tail shaft rod section (1131), and a part of the second tail shaft rod section (1132) is inserted into the first tail shaft rod section (1131) and connected with the first tail shaft rod section (1131), so that the second flange plate (11 b) and the third flange plate (11 c) clamp the high-pressure oil pump cam (15) together.

6. The combination camshaft as claimed in claim 2, wherein,

the first torsion part (11 d) is one of a hexagonal annular protrusion and a hexagonal hole, and the second torsion part (11 e) is the other; or alternatively, the process may be performed,

the first torsion part (11 d) and the second torsion part (11 e) are hexagonal annular protrusions; or alternatively, the process may be performed,

the first torsion part (11 d) and the second torsion part (11 e) are hexagonal holes.

7. A combined camshaft according to claim 1, characterized in that the side wall of the first flange (11 a) adjacent to the cam plate (12) is provided with anti-slip texture.

8. -the combined camshaft according to claim 1, characterized in that the cam plate (12) is provided with a cam plate shaft hole (a) allowing the shaft section (11) to pass through, and a first countersink (B1) and a second countersink (B2), the first countersink (B1) and the second countersink (B2) being located at the axial ends of the cam plate shaft hole (a), respectively;

at least part of the first flange plate (11 a) is embedded in the first sinking groove (B1), and at least part of the bearing (13) is embedded in the second sinking groove (B2).

9. A combined camshaft according to claim 1, characterized in that the shaft section (11) is screwed with the bearing (13).

10. An engine, characterized in that it comprises a combined camshaft according to any one of claims 1 to 9.

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