阅读说明：本技术 一种凸轮轴切换机构 (Camshaft switching mechanism ) 是由 张涛 周强 张金伟 李中林 王波 于 2019-11-21 设计创作，主要内容包括：本发明提供一种凸轮轴切换机构,包括切换机构本体(10)、左凸轮(11)和右凸轮(12),所述的切换机构本体(10)上形成切换槽(1),所述的切换槽(1)呈漏斗形结构,其相对两侧分别形成左切换侧面和右切换侧面,所述的左切换侧面包括依次连接的左侧面导入段(4)、左侧面切换段(6)和左侧面完成段(8),所述的右切换侧面包括依次连接的右侧面导入段(5)、右侧面切换段(7)和右侧面完成段(9)。本发明可减小切换机构的轴向安装空间,具有结构简单、实施成本低等突出优点。(The invention provides a camshaft switching mechanism which comprises a switching mechanism body (10), a left cam (11) and a right cam (12), wherein a switching groove (1) is formed in the switching mechanism body (10), the switching groove (1) is of a funnel-shaped structure, a left switching side face and a right switching side face are respectively formed on two opposite sides of the switching groove, the left switching side face comprises a left side face introduction section (4), a left side face switching section (6) and a left side face completion section (8) which are sequentially connected, and the right switching side face comprises a right side face introduction section (5), a right side face switching section (7) and a right side face completion section (9) which are sequentially connected. The invention can reduce the axial installation space of the switching mechanism and has the outstanding advantages of simple structure, low implementation cost and the like.)

1. A camshaft switching mechanism, includes switching mechanism body (10), left cam (11) and right cam (12), its characterized in that: switching mechanism body (10) on form and switch groove (1), switch groove (1) be the infundibulate structure, its relative both sides form left side switching side and right side switching side respectively, left side switching side including left surface guide section (4), left surface switching section (6) and left surface completion section (8) that connect gradually, right side switching side including right surface guide section (5), right surface switching section (7) and right surface completion section (9) that connect gradually.

2. A camshaft switching mechanism as claimed in claim 1, wherein: the left switching side face and the right switching side face of the switching groove (1) are axially and symmetrically distributed on the central plane of the switching groove (1).

3. A camshaft switching mechanism as claimed in claim 1, wherein: the axis of the switching groove (1) is the rotation center (3) of the switching mechanism body (10).

4. A camshaft switching mechanism as claimed in claim 1, wherein: the switching groove (1) is provided with 1 groove.

5. A camshaft switching mechanism as claimed in any one of claims 1 to 4, wherein: the axial climbing distance of the left switching side surface is smaller than or equal to the center distance between the left cam (11) and the right cam (12).

6. A camshaft switching mechanism as claimed in any one of claims 1 to 4, wherein: the axial climbing distance of the right switching side surface is smaller than or equal to the center distance between the left cam (11) and the right cam (12).

7. A camshaft switching mechanism as claimed in any one of claims 1 to 4, wherein: the outer side of the switching mechanism body (10) forms an outer cylindrical surface (2), and the axis of the outer cylindrical surface (2) is the rotation center (3) of the switching mechanism body (10).

8. A camshaft switching mechanism as claimed in any one of claims 1 to 4, wherein: when the left cam (11) and the right cam (12) perform left-right switching action, the switching distance is equal to the center distance between the left cam (11) and the right cam (12).

Technical Field

The invention relates to the field of design of camshaft switching structures, in particular to a camshaft switching mechanism applied to a sliding type variable valve lift system.

Background

With the continuous development and progress of science and technology, the thermodynamic performance requirements of an automobile fuel engine are improved, and a fuel engine with a variable valve lift system is produced, and the sliding type variable valve lift system is a representative widely applied in the market.

One of the core technologies of the sliding variable valve lift system is a camshaft switching mechanism. The camshaft switching mechanism widely used in the current market comprises 2 switching grooves and more than 2 switching grooves, the structural design not only increases the processing difficulty of the camshaft switching mechanism, but also causes the axial space of the camshaft switching mechanism to be larger, and the camshaft switching mechanism cannot be installed and arranged on an engine with smaller space; in addition, the center distance of the driving pin on the electromagnetic actuator matched with the camshaft switching mechanism is larger, so that the cost of the electromagnetic actuator is higher, and the use cost of the camshaft system is increased correspondingly.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: to the problems existing in the prior art, the camshaft switching mechanism is provided, and the axial installation space of the switching mechanism is reduced.

The technical problem to be solved by the invention is realized by adopting the following technical scheme: the utility model provides a camshaft switching mechanism, includes switching mechanism body, left cam and right cam, the switching mechanism body on form the switching groove, the switching groove be the infundibulate structure, its relative both sides form left side switching side and right side switching side respectively, left side switching side including the left surface that connects gradually section of leading in, left surface switching section and left surface completion section, right side switching side including the right surface that connects gradually section of leading in, right side switching section and right surface completion section.

Preferably, the left switching side face and the right switching side face of the switching groove are axially and symmetrically distributed on a central plane of the switching groove.

Preferably, the axis of the switching groove is a rotation center of the switching mechanism body.

Preferably, 1 switching slot is arranged.

Preferably, the axial climbing distance of the left switching side surface is smaller than or equal to the center distance between the left cam and the right cam.

Preferably, the axial climbing distance of the right switching side surface is smaller than or equal to the center distance between the left cam and the right cam.

Preferably, the outer side of the switching mechanism body forms an outer cylindrical surface, and the axis of the outer cylindrical surface is the rotation center of the switching mechanism body.

Preferably, when the left cam and the right cam perform left-right switching action, the switching distance is equal to the center distance between the left cam and the right cam.

Compared with the prior art, the invention has the beneficial effects that: through the switching groove that forms the infundibulate structure on the switching mechanism body, and the left side in the switching groove switches the section including the left surface guide-in section, left surface switching section and the left surface completion section that connect gradually, and switches the right side in the groove and switches the section including the right surface guide-in section, right surface switching section and the right surface completion section that connect gradually, not only can reduce the axial installation space of switching mechanism, simple structure moreover, the implementation cost is low.

Drawings

Fig. 1 is a schematic diagram (right side) of switching cooperation between a camshaft switching mechanism and an electromagnetic actuator.

Fig. 2 is a schematic diagram (left side) of the switching cooperation between the camshaft switching mechanism and the electromagnetic actuator.

Fig. 3 is a fitting layout view of the camshaft switching mechanism in combination with 2-cylinder 2-type wire cams.

Fig. 4 is a schematic configuration diagram of the switching mechanism body in fig. 1 to 3.

Part label name in the figure: 1-switching groove, 2-outer cylindrical surface, 3-rotation center, 4-left side surface introduction section, 5-right side surface introduction section, 6-left side surface switching section, 7-right side surface switching section, 8-left side surface completion section, 9-right side surface completion section, 10-switching mechanism body, 11-left cam, 12-right cam, 13-rocker arm, 14-electromagnetic actuator, 15-left driving pin and 16-right driving pin.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

As shown in fig. 1, 2 and 3, the camshaft switching mechanism mainly includes a switching mechanism body 10, a left cam 11, a right cam 12, a rocker arm 13 and an electromagnetic actuator 14, the specific structure of the switching mechanism body 10 is as shown in fig. 4, a switching groove 1 is formed on the switching mechanism body 10, the switching groove 1 is only provided with 1 switching groove and is in a funnel-shaped structure, a left switching side surface and a right switching side surface are respectively formed on two opposite sides of the switching groove 1, and the left switching side surface and the right switching side surface are both merged towards the middle; the left side switch side include left surface guide-in section 4, left surface switch section 6 and the left surface completion section 8 that connect gradually, the right side switch side include right surface guide-in section 5, right surface switch section 7 and the right surface completion section 9 that connect gradually. Normally, the left and right switching side surfaces of the switching groove 1 are axially symmetrically distributed on the center plane of the switching groove 1, and the axis of the switching groove 1 is the rotation center 3 of the switching mechanism body 10. The outer side of the switching mechanism body 10 forms an outer cylindrical surface 2, and the axis of the outer cylindrical surface 2 is the rotation center 3 of the switching mechanism body 10.

The switching mechanism body 10, the left cam 11 and the right cam 12 are combined together and mounted on a mandrel of a camshaft rotatably supported in a cylinder head shell of the fuel engine, and after the switching mechanism body 10 is matched with a corresponding electromagnetic actuator 14, the switching mechanism body can slide in the axial direction of the mandrel in the left-right axial direction; when the fixedly installed electromagnetic actuator 14 and the switching mechanism body 10 work together, 1 driving pin on the electromagnetic actuator 14 is ensured to be positioned at the slot position of the switching slot 1. The left switching side surface and the right switching side surface on the switching groove 1 are respectively matched with the left driving pin and the right driving pin on the corresponding electromagnetic actuator 14 to perform switching sliding, and when the driving pin on the electromagnetic actuator 14 travels from the leading-in section to the completion section of the switching groove 1, the camshaft is indicated to complete switching. In the switching process, the switching side surface on the switching groove 1 is matched with the corresponding driving pin on the electromagnetic actuator 14 to bear force, the driving pin enters from the large opening end of the switching groove 1 and exits from the small opening end of the switching groove 1, namely exits from the middle junction of the switching groove 1, so that the axial arrangement space of the camshaft switching mechanism can be reduced, the structure is simple, and the implementation cost is low. In particular, the amount of the solvent to be used,

as shown in fig. 1, in the process of the cooperation between the right cam 12 of the camshaft and the rocker arm 13, the left driving pin 15 on the electromagnetic actuator 14 is located between the left side complete section 8 and the right side complete section 9 of the switching slot 1, at this time, if the cooperation between the right cam 12 and the rocker arm 13 is switched to the cooperation between the left cam 11 and the rocker arm 13, the right driving pin 16 on the electromagnetic actuator 14 extends out and enters the left side lead-in section 4 of the switching slot 1, along with the rotation of the camshaft, the right driving pin 16 enters the left side switching section 6 and then enters the left side complete section 8, the switching of the camshaft is completed, and after the switching, the left cam 11 and the rocker arm 13 cooperate to work, as shown in fig. 2.

As shown in fig. 2, during the cooperation of the left cam 11 and the rocker arm 13 of the camshaft, the right driving pin 16 on the electromagnetic actuator 14 is located between the left side finished section 8 and the right side finished section 9 of the switching slot 1, at this time, if the cooperation state of the left cam 11 and the rocker arm 13 is switched to the cooperation state of the right cam 12 and the rocker arm 13, the left driving pin 15 on the electromagnetic actuator 14 extends out and enters the right side guide-in section 5 of the switching slot 1, along with the rotation of the camshaft, the left driving pin 15 enters the right side switching section 7 and then enters the right side finished section 9, the switching of the camshaft is completed, and after the switching is completed, the right cam 12 and the rocker arm 13 cooperate as shown in fig. 1.

As shown in fig. 3, the same camshaft switching mechanism works in cooperation with the cams of 2 cylinders, and the switching operation principle is shown in fig. 1 and fig. 2, which is not described herein again. Therefore, it is possible to reduce the number of electromagnetic actuators 14 required for switching the action coordination, thereby reducing the cost and reducing the arrangement space.

The camshaft switching mechanism can be matched with an electromagnetic actuator with a smaller driving pin center distance while reducing the axial space, so that the camshaft switching mechanism can be used in a fuel engine with a smaller space. In order to ensure the operational reliability of the camshaft switching mechanism, when the left cam 11 and the right cam 12 perform left-right switching operation, the switching distance is equal to the center distance between the left cam 11 and the right cam 12, and the axial climbing distance of the left switching side surface and the right switching side surface on the switching groove 1 is less than or equal to the center distance between the left cam 11 and the right cam 12; in addition, the axial distance between the leading-in section side face and the finishing section side face of the switching groove 1 should not be greater than the camshaft switching distance, that is, the axial change distances of the left side face switching section 6 and the right side face switching section 7 are not greater than the camshaft switching distance respectively.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, it should be noted that any modifications, equivalents and improvements made within the spirit and principle of the present invention should be included in the scope of the present invention.