A needle guide

Abstract

The utility model discloses a kind of needle guide mechanism, it includes including guide sleeve and guide pillar, the guide sleeve with the guide pillar between being equipped with stable guiding structure, the stable guiding structure includes needle assembly and with the planar structure that needle assembly is attached;The needle assembly includes multiple needle groups, the planar structure includes multiple planes;The guide sleeve is further equipped with the interface assembly with guide sleeve inside connection intercommunication.This utility model is matched by using needle assembly and the planar structure on guide pillar, the line contact between needle and guiding surface is realized, greatly increased contact area, dispersed contact stress, improve the carrying capacity, rigidity and impact resistance of guiding mechanism;By setting interface assembly, lubricating oil or coolant can be directly injected into needle circulation channel inside by the side cover on the mouth, without disassembling entire guide sleeve, lubricating oil can be filled, circulated and replaced, simplify maintenance process, save maintenance time.

Description

Technical Field

[0001] This utility model relates to the technical field of guiding mechanisms, specifically to a needle roller guiding mechanism. Background Technology

[0002] In the field of mechanical automation, linear guide mechanisms are core components for achieving precise linear motion and are widely used in CNC machine tools, industrial robots, precision measuring equipment, and other applications. Traditional linear guide mechanisms are mainly divided into two categories: sliding guides and rolling guides. Sliding guide mechanisms rely on the surface contact between the guide sleeve and the guide post. Although the structure is simple, it has disadvantages such as high frictional resistance, easy wear, low operating speed, and susceptibility to creeping, making it difficult to meet the application requirements of high speed, high precision, and long service life.

[0003] While existing rolling guide mechanisms (such as those using ball bearings) can effectively reduce friction, they still have some inherent drawbacks. 1. Existing rolling guides have point contact with the guide rail, leading to stress concentration and limiting their load-bearing capacity and impact resistance. 2. Common rolling guide structures are complex; lubricant injection and replacement often require disassembling the entire mechanism, making maintenance inconvenient and affecting the continuous operation efficiency of the equipment. 3. During high-speed reciprocating motion, if the internal heat generated cannot be effectively monitored and dissipated, it will affect guiding accuracy and shorten service life. Utility Model Content

[0004] This utility model addresses the shortcomings of current technology by providing a needle roller guide mechanism, aiming to solve the technical problems of poor motion stability and cumbersome procedures for adding or maintaining lubricating oil or coolant in existing guide mechanisms.

[0005] The technical solution adopted by this utility model to achieve the above objectives is as follows: A needle roller guiding mechanism includes a guide sleeve and a guide post. The guide sleeve is fitted onto the guide post and reciprocates along the direction of the guide post. A stable guiding structure is provided between the guide sleeve and the guide post. The stable guiding structure includes a needle roller assembly and a planar structure that fits against the needle roller assembly. The needle roller assembly is disposed on the inner wall of the guide sleeve, and the planar structure is disposed on the outer wall of the guide post. The needle roller assembly includes multiple sets of needle rollers, and the planar structure includes multiple planes. The needle rollers are respectively disposed on the planes. The guide sleeve also has an interface assembly that connects and communicates with the interior of the guide sleeve.

[0006] As a further improvement, the guide sleeve is provided with multiple guide cavity groups, which are arranged in a ring array within the guide sleeve. Both ends of the guide sleeve are provided with needle roller circulation brackets, and each needle roller circulation bracket is provided with multiple ring array needle roller circulation guide grooves. The needle roller circulation guide grooves are respectively connected and communicated with the guide cavity groups to form a needle roller circulation channel, and the needle roller groups are arranged within the needle roller circulation channel.

[0007] As a further improvement, the guide cavity assembly includes a guide cavity disposed on and penetrating the guide sleeve and a guide groove disposed on the inner wall of the guide sleeve. The guide cavity and the guide groove are arranged in parallel. The two ends of the guide cavity are respectively connected to one end of the needle roller circulation guide groove of the two needle roller circulation brackets, and the other ends of the needle roller circulation guide groove of the two needle roller circulation brackets are respectively connected to both ends of the guide groove. The needle roller assembly includes multiple needle rollers, and the multiple needle rollers are arranged in an array in the needle roller circulation channel, wherein the needle rollers that move into the guide groove are in contact with the plane to form a rolling sliding connection.

[0008] As a further improvement, the guide sleeve is also provided with two side covers, which are respectively located on the outer side of the needle roller circulation bracket, and the side covers are detachably connected to the guide sleeve bracket; the side covers are provided with placement grooves for positioning the needle roller circulation bracket, the placement grooves are provided with a plurality of positioning posts in a ring array, and the needle roller circulation bracket is provided with a plurality of positioning slots that cooperate with and connect to the positioning posts.

[0009] As a further improvement, each side cover is also provided with multiple annular array interfaces, each interface being connected and communicating with the needle roller circulation guide groove. The interface assembly includes multiple interface groups, each interface group including two connectors. The two connectors are respectively disposed on the interfaces of the two side covers, and the connectors are connected and communicating with the interfaces.

[0010] As a further improvement, a sealing ring is provided between the inner wall of the side cover and the outer wall of the guide post.

[0011] As a further improvement, one of the side covers is also provided with a groove, and a temperature sensor for detecting the temperature of the guide sleeve is provided in the groove.

[0012] As a further improvement, both ends of the guide post are provided with threaded holes, and one end of the guide post is provided with a limiting ring block.

[0013] As a further improvement, the guide sleeve is also provided with an annular portion, which has multiple mounting through holes and positioning planes.

[0014] As a further improvement, a positioning arc surface is provided between two adjacent planes, and a positioning protrusion is provided between two adjacent guide grooves. The inner wall of the positioning protrusion is provided with a positioning arc surface that fits with the positioning arc surface.

[0015] Compared with the prior art, the above-mentioned technical solutions in the needle roller guide mechanism provided by the present invention have at least one of the following technical effects: 1. This utility model achieves line contact between the needle roller assembly and the planar structure on the guide post by using a needle roller assembly in conjunction with the planar structure on the guide post. Compared with traditional point contact (such as ball bearings), line contact greatly increases the contact area and disperses the contact stress, thereby significantly improving the load-bearing capacity, rigidity, and impact resistance of the guiding mechanism. At the same time, the rolling friction coefficient is much lower than that of sliding friction, ensuring smooth and accurate operation of the mechanism, effectively reducing wear, and extending service life. The guide cavity assembly set in the guide sleeve and the needle roller circulation brackets at both ends together form a closed needle roller circulation channel, in which the needle rollers can continuously circulate and roll, enabling the guide sleeve to achieve smooth and continuous reciprocating motion with unlimited stroke on the guide post. This is particularly suitable for automated application scenarios that require long stroke and high-frequency reciprocating motion.

[0016] 2. By incorporating an interface component, lubricating oil or coolant can be directly injected into the needle roller circulation channel through the connector on the side cover, allowing for lubricant filling, circulation, and replacement without disassembling the entire guide sleeve. This significantly simplifies the maintenance process, saves maintenance time, and ensures the continuous and efficient operation of the equipment.

[0017] 3. By setting an optional temperature sensor, the internal temperature of the guide sleeve can be monitored in real time and linked with the external liquid supply system to achieve intelligent temperature control and overheat protection, ensuring the operational stability of the needle roller guide mechanism. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the overall structure of the needle roller guide mechanism in this embodiment; Figure 2 This is an exploded view of the needle roller guide mechanism in this embodiment; Figure 3 This is a front view of the needle roller guide mechanism in this embodiment; Figure 4 for Figure 3 AA section view diagram. Detailed Implementation

[0020] The following description is only a preferred embodiment of the present invention and does not limit the scope of protection of the present invention.

[0021] For examples, see the appendix. Figures 1-4A needle roller guiding mechanism 1 includes a guide sleeve 2 and a guide post 3. The guide sleeve 2 has a through hole along its axis for inserting the guide post 3. The guide sleeve 2 is sleeved on the guide post 3 and reciprocates along the direction of the guide post 3. A stable guiding structure 4 is provided between the guide sleeve 2 and the guide post 3. The stable guiding structure 4 includes a needle roller assembly 40 and a planar structure 41 that fits against the needle roller assembly 40. The needle roller assembly 40 is disposed on the inner wall of the guide sleeve 2, and the planar structure 41 is disposed on the outer wall of the guide post 3. The needle roller assembly 40 includes... Multiple sets of needle rollers 400 are provided. The planar structure 41 includes multiple planes 410, and the needle rollers 400 are respectively disposed on the planes 410. The guide sleeve 2 is also provided with an interface component 10 that is connected and communicates with the interior of the guide sleeve 2. Preferably, there are four or six sets of needle rollers 400. The needle rollers 400 are arranged in a circular array inside the guide sleeve 2. When there are four sets of needle rollers 400, there are also four guide cavity groups 20. When there are six sets of needle rollers 400, there are also six guide cavity groups 20.

[0022] The guide sleeve 2 is provided with multiple guide cavity groups 20, which are arranged in a ring array within the guide sleeve 2. Both ends of the guide sleeve 2 are provided with needle roller circulation brackets 21, and each needle roller circulation bracket 21 is provided with multiple ring array needle roller circulation guide grooves 210. The needle roller circulation guide grooves 210 are respectively connected to the guide cavity groups 20 to form a needle roller circulation channel 5. The needle roller group 400 is arranged within the needle roller circulation channel 5. The guide cavity assembly 20 includes a guide cavity 200 disposed on the guide sleeve 2 and penetrating the guide sleeve 2, and a guide groove 201 disposed on the inner wall of the guide sleeve 2. The guide cavity 200 and the guide groove 201 are arranged in parallel. The two ends of the guide cavity 200 are respectively connected to one end of the needle roller circulation guide groove 210 of the two needle roller circulation brackets 21, and the other ends of the needle roller circulation guide groove 210 of the two needle roller circulation brackets 21 are respectively connected to both ends of the guide groove 201. The needle roller assembly 400 includes multiple needle rollers, which are arranged in an array in the needle roller circulation channel 5. The needle rollers that move into the guide groove 201 are in contact with the plane 410 to form a rolling sliding connection. The needle rollers and the plane 410 achieve line contact, thereby improving the movement stability and service life of the guide sleeve 2 on the guide post 3.

[0023] The guide sleeve 2 is also provided with two side covers 22, which are respectively located on the outer side of the needle roller circulation bracket 21. Each side cover 22 is detachably connected to the guide sleeve 2 bracket 6. The detachable connection 6 includes multiple countersunk holes on the side cover 22 and multiple threaded holes on the end wall of the guide sleeve 2. Each countersunk hole is equipped with a screw, which is threaded into the threaded hole to fix the side cover 22 to the guide sleeve 2. Each side cover 22 is provided with a placement groove 220 for positioning the needle roller circulation bracket 21. The placement groove 220 is provided with a plurality of positioning posts 220a in a ring array. The needle roller circulation bracket 21 is provided with a plurality of positioning slots 211 that cooperate with and connect with the positioning posts 220a. The needle roller circulation bracket 21 is used for guiding and positioning. One end of the needle roller circulation bracket 21 facing the guide cavity 200 is provided with a positioning insert 212. Both ends of the guide cavity 200 are provided with positioning slots 200b of the positioning insert 212. The positioning insert 212 is inserted into and positioned by the positioning slot 200b. Each side cover 22 is also provided with multiple annular array interfaces 221. The interfaces 221 are respectively connected and communicate with the needle roller circulation guide groove 210. The interface assembly 10 includes multiple interface groups 100. Each interface group 100 includes two nozzles. The two nozzles are respectively disposed on the interfaces 221 of the two side covers 22. The nozzles are connected and communicate with the interfaces 221. One nozzle is an inlet and the other nozzle is an outlet. The interface assembly 10 is used as an inlet and outlet for lubricating oil or coolant. The nozzles are preferably quick-connect nozzles with a one-way valve diaphragm or ordinary quick-connect nozzles, thereby providing lubricating oil or coolant to the internal needle rollers, improving the convenience of lubricating oil or coolant injection or replacement, eliminating the need for disassembly, and saving maintenance time.

[0024] A sealing ring 7 is provided between the inner wall of the side cover 22 and the outer wall of the guide post 3. The sealing ring 7 is preferably a rubber sealing ring 7. The side cover 22 is provided with an annular mounting groove 221. The annular mounting groove 221 is provided with a plurality of annular array positioning arc blocks 221a and a plurality of through holes 221b. The sealing ring 7 is provided with an annular positioning slot 70 and a plurality of pins 71. The annular positioning slot 70 is inserted into the plurality of positioning arc blocks 221a. The pins 71 are respectively inserted into the through holes 221b to achieve a snap-fit, so that the sealing ring 7 is installed in the annular mounting groove 221. The inner wall of the sealing ring 7 is tightly fitted with the outer wall of the guide post 3, and the outer wall of the sealing ring 7 is tightly fitted with the side cover 22. The sealing ring 7 is used for sealing to prevent the coolant or lubricating oil in the guide sleeve 2 from being exposed.

[0025] One of the side covers 22 is also provided with a groove, in which a temperature sensor 8 for detecting the temperature of the guide sleeve 2 is provided. The temperature sensor 8 is electrically connected to an external liquid supply device. When the guide sleeve 2 moves back and forth, the heat generated can be transmitted to the external liquid supply device in real time in the form of an electrical signal, thereby playing the role of temperature detection.

[0026] Both ends of the guide post 3 are provided with threaded holes, and one end of the guide post 3 is provided with a limiting ring block 30. The limiting ring block 30 is used to limit the stroke and prevent the guide sleeve 2 from running beyond its stroke and disengaging from the guide post 3.

[0027] The guide sleeve 2 is also provided with an annular portion 23, which has multiple mounting through holes and a positioning plane. The mounting through holes are preferably countersunk holes. The mounting through holes and the positioning plane 410 provide an installation connection structure when external connectors are installed.

[0028] A positioning arc surface 410a is provided between two adjacent planes 410, and a positioning protrusion 202 is provided between two adjacent guide grooves 201. The inner wall of the positioning protrusion 202 is provided with a positioning arc surface 202a that fits with the positioning arc surface 410a. The positioning arc surface 410a and the positioning arc surface 202a are used to ensure the stability of the guide sleeve 2 when it moves back and forth on the guide post 3.

[0029] This invention achieves line contact between the needle roller assembly and the guide post by using a combination of needle roller assembly and planar structure. Compared to traditional point contact (such as ball bearings), line contact significantly increases the contact area and disperses contact stress, thereby significantly improving the load-bearing capacity, rigidity, and impact resistance of the guiding mechanism. Simultaneously, the rolling friction coefficient is much lower than sliding friction, ensuring smooth and precise operation of the mechanism, effectively reducing wear, and extending service life. The guide cavity assembly within the guide sleeve, together with the needle roller circulation supports at both ends, forms a closed needle roller circulation channel. The needle rollers can continuously circulate within this channel, enabling the guide sleeve to achieve smooth and unlimited reciprocating motion on the guide post, making it particularly suitable for automated applications requiring long strokes and high-frequency reciprocating motion. An interface assembly allows lubricating oil or coolant to be directly injected into the needle roller circulation channel through the connector on the side cover, enabling lubricant filling, circulation, and replacement without disassembling the entire guide sleeve. This greatly simplifies the maintenance process, saves maintenance time, and ensures continuous and efficient operation of the equipment. By installing an optional temperature sensor, the internal temperature of the guide sleeve can be monitored in real time and linked with the external liquid supply system to achieve intelligent temperature control and overheat protection, ensuring the operational stability of the needle roller guide mechanism.

[0030] This utility model is not limited to the above-described embodiments. Other needle roller guide mechanisms obtained by using the same or similar structures or devices as the above-described embodiments of this utility model are all within the protection scope of this utility model.

Claims

1. A needle roller guiding mechanism, the guiding mechanism comprising a guide sleeve and a guide post, the guide sleeve being sleeved on the guide post and reciprocating along the direction of the guide post, characterized in that: A stable guiding structure is provided between the guide sleeve and the guide post. The stable guiding structure includes a needle roller assembly and a planar structure that fits against the needle roller assembly. The needle roller assembly is disposed on the inner wall of the guide sleeve, and the planar structure is disposed on the outer wall of the guide post. The needle roller assembly includes multiple sets of needle rollers, and the planar structure includes multiple planes. The needle rollers are respectively disposed on the planes. The guide sleeve also has an interface assembly that connects and communicates with the interior of the guide sleeve. The guide sleeve also has two side covers, each of which has multiple annular array interfaces. The interface assembly includes multiple sets of interface groups, each of which includes two connectors. The two connectors are respectively disposed on the interfaces of the two side covers, and the connectors are connected and communicate with the interfaces.

2. The needle roller guide mechanism according to claim 1, characterized in that: The guide sleeve is provided with multiple guide cavity groups, which are arranged in a ring array within the guide sleeve. Both ends of the guide sleeve are provided with needle roller circulation brackets, and each needle roller circulation bracket is provided with multiple ring array needle roller circulation guide grooves. The needle roller circulation guide grooves are respectively connected to the guide cavity groups to form a needle roller circulation channel, and the needle roller groups are arranged within the needle roller circulation channel.

3. The needle roller guide mechanism according to claim 2, characterized in that: The guide cavity assembly includes a guide cavity disposed on and passing through the guide sleeve and a guide groove disposed on the inner wall of the guide sleeve. The guide cavity and the guide groove are arranged in parallel. The two ends of the guide cavity are respectively connected to one end of the needle roller circulation guide groove of the two needle roller circulation brackets, and the other ends of the needle roller circulation guide groove of the two needle roller circulation brackets are respectively connected to both ends of the guide groove. The needle roller assembly includes multiple needle rollers, which are disposed in the needle roller circulation channel. The needle rollers that move into the guide groove are in contact with the plane to form a rolling sliding connection.

4. The needle roller guide mechanism according to claim 3, characterized in that: The two side covers are respectively located on the outer side of the needle roller circulation bracket, and the side covers are detachably connected to the guide sleeve bracket; the side covers are provided with placement grooves for positioning the needle roller circulation bracket, the placement grooves are provided with a plurality of positioning posts in a ring array, and the needle roller circulation bracket is provided with a plurality of positioning slots that cooperate with and connect to the positioning posts.

5. The needle roller guide mechanism according to claim 4, characterized in that: The interfaces are respectively connected to the needle roller circulation guide groove.

6. The needle roller guide mechanism according to claim 5, characterized in that: A sealing ring is provided between the inner wall of the side cover and the outer wall of the guide post.

7. The needle roller guide mechanism according to claim 6, characterized in that: One of the side covers is also provided with a groove, and a temperature sensor for detecting the temperature of the guide sleeve is provided in the groove.

8. The needle roller guide mechanism according to claim 1, characterized in that: Both ends of the guide post are provided with threaded holes, and one end of the guide post is provided with a limiting ring block.

9. The needle roller guide mechanism according to claim 1, characterized in that: The guide sleeve is also provided with an annular portion, which has multiple mounting through holes and positioning planes.

10. The needle roller guide mechanism according to claim 3, characterized in that: A positioning arc surface is provided between two adjacent planes, and a positioning protrusion is provided between two adjacent guide grooves. The inner wall of the positioning protrusion is provided with a positioning arc surface that fits with the positioning arc surface.

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